HP Color LaserJet 8500 Service Manual
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- HP Color LaserJet 8500 | Service Manual - Page 1
8500/8550 Printer Family Service Manual English - HP Color LaserJet 8500 | Service Manual - Page 2
- HP Color LaserJet 8500 | Service Manual - Page 3
HP Color LaserJet 8500/8550 Printer Family Service Manual - HP Color LaserJet 8500 | Service Manual - Page 4
Printed in USA Warranty The information contained in this document is subject to change without notice. Hewlett-Packard makes no warranty of any kind with respect to this information. HEWLETT-PACKARD SPECIFICALLY DISCLAIMS THE IMPLIED WARRANTY OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE - HP Color LaserJet 8500 | Service Manual - Page 5
control panel overlay 79 Printer control panel layout 80 Menu maps 82 Selecting the display language 97 Installing the consumables 98 Configuring input trays 103 Verifying the printer is installed correctly 105 Verifying DIMM installation 106 Duplex registration (HP Color LaserJet 8550 - HP Color LaserJet 8500 | Service Manual - Page 6
111 Cleaning procedures 113 Printer consumables 118 5 Theory of operation Chapter contents 133 Introduction 135 Color theory 138 Image formation 141 Consumable detection mechanisms 154 Electrical systems 164 Mechanical systems 169 Paper path 178 Printer timing 192 EPH controller board - HP Color LaserJet 8500 | Service Manual - Page 7
contents 363 Pre-troubleshooting checklist 367 Printer message troubleshooting 368 Aids to troubleshooting 415 Paper path troubleshooting 433 Image formation troubleshooting 438 Image defects troubleshooting 441 Color balance adjustment 457 Repetitive defects troubleshooting 462 Repetitive - HP Color LaserJet 8500 | Service Manual - Page 8
6 Contents EN - HP Color LaserJet 8500 | Service Manual - Page 9
control panel features 80 Consumables installation 98 DIMM slot configuration 106 Duplex registration 107 Removing the toner catch tray cover 116 Cleaning the toner catch tray 117 Location of consumables in printer 118 Contents of transfer kit 120 Contents of drum kit 124 Contents of fuser - HP Color LaserJet 8500 | Service Manual - Page 10
detection 157 Color toner lever detection 158 Density sensor 160 Transfer belt control 161 Cleaning roller control 162 Carousel control 163 Power distribution circuit diagram 164 Power Save circuit diagram 165 High-voltage power supply circuit 168 Laser/scanner 170 Printer motors - HP Color LaserJet 8500 | Service Manual - Page 11
242 Figure 95. Plate, HP Color LaserJet 8550 MFP printer 243 Figure 96. Rear cover 244 Figure 97. Bottom of the control panel 246 Figure 98. Laser/scanner shield 247 Figure 99. Scanner unit 248 Figure 100. Upper airflow vent 249 Figure 101. Face-down exit sensor rail 249 Figure 102. Face - HP Color LaserJet 8500 | Service Manual - Page 12
/imaging drum bias supply, HP Color LaserJet 8550 printer 288 Figure 140. Developer/imaging drum bias supply 289 Figure 141. Post charger HV module 290 Figure 142. High-voltage power supply 291 Figure 143. Cleaning roller HV module 292 Figure 144. Main relay PCA 293 Figure 145. Drum/cartridge - HP Color LaserJet 8500 | Service Manual - Page 13
(1 of 2 323 Figure 174. Input paper guide (2 of 2 324 Figure 175. Metallic tape and housing assembly (1 of 2) . . . . . 325 Figure 176. Metallic tape and housing assembly (2 of 2) . . . . . 326 Figure 177. Controller PCA (1 of 2 327 Figure 178. Controller PCA (2 of 2 328 Figure 179. Anti-curl - HP Color LaserJet 8500 | Service Manual - Page 14
an HP Color LaserJet 8500 printer configuration page 417 Figure 213. Example of an HP Color LaserJet 8550 printer configuration page 417 Figure 214. Right upper cover detection interlock 425 Figure 215. Drum cartridge detection interlock 425 Figure 216. Black toner cartridge detection interlock - HP Color LaserJet 8500 | Service Manual - Page 15
Printer covers and doors (1 of 4)-Filler panel for tray 2 (HP Color LaserJet 8550 base model only) . 519 Figure 250. Printer covers and doors (2 of 4 520 Figure 251. Printer covers and doors (3 of 4 522 Figure 252. Printer 260. Drum/cartridge drive Fuser assembly (1 of 2 556 Figure 276. Fuser - HP Color LaserJet 8500 | Service Manual - Page 16
Figure 283. 3,000-sheet stapler/stacker components (1 of 2) . . 570 Figure 284. 3,000-sheet stapler/stacker components (2 of 2) . . 572 14 List of Figures EN - HP Color LaserJet 8500 | Service Manual - Page 17
91 I/O Menu 91 Resets Menu 92 Color Adjust Menu 92 Service Mode Menu 93 Replacement frequencies for printer consumables . . 119 Subtractive color absorption 138 Subtractive color mixing 139 Additive color mixing 140 Fusing temperatures 166 Printer motor and heater names and descriptions - HP Color LaserJet 8500 | Service Manual - Page 18
bin mailbox sensors, switches, motors, and controller board PCA 209 Numbered printer messages 368 Unnumbered printer messages 388 Sensor monitor test parts (5 of 6 537 Internal components parts (6 of 6 539 Drum/cartridge drive assembly parts 540 Delivery drive assembly parts 541 Tray 3 - HP Color LaserJet 8500 | Service Manual - Page 19
87. Table 88. Table 89. Table 90. Table 91. Table 92. Delivery assembly parts 553 Delivery cover assembly parts 554 Transfer belt assembly parts 555 Fuser assembly parts 558 PCA assembly parts 559 2,000-sheet input unit cover and door parts 561 2,000-sheet input unit internal component parts - HP Color LaserJet 8500 | Service Manual - Page 20
18 List of Tables EN - HP Color LaserJet 8500 | Service Manual - Page 21
22 Specifications 24 Electrical specifications 24 Operating environment specifications 24 Acoustic emission specifications 25 Printer dimensions 25 Consumable storage specifications 26 Site requirements 27 General guidelines 27 Space requirements 28 Media requirements 29 Selecting - HP Color LaserJet 8500 | Service Manual - Page 22
Printer Information 39 Configurations 39 External views 41 Formatter assemblies 43 Media-handling accessories and options 44 Safety information 46 FCC regulations 46 Canadian DOC regulations 46 Declarations of conformity 47 VCCI statement (Japan)-8500 models 54 VCCI statement (Japan)-8550 - HP Color LaserJet 8500 | Service Manual - Page 23
manual covers service topics for the following printers and their paper-handling optional accessories: HP Color LaserJet 8500 printer (base model) HP Color LaserJet 8500 N printer HP Color LaserJet 8500 DN printer HP Color LaserJet 8550 printer (base model) HP Color LaserJet 8550 N printer - HP Color LaserJet 8500 | Service Manual - Page 24
accessories by printer model Model Feature/accessory 8500 8500 N 8500 DN 8550 8550 N 8550 DN 8550 GN 8550 MFP Standard DIMM memory (in MB) 32 32 64 32 64 64 128 64 Maximum DIMM memory1 (in MB) 256 256 256 512 512 512 512 512 Features Internal hard disk X X X X X X HP - HP Color LaserJet 8500 | Service Manual - Page 25
17 inch size Heavy paper Transparencies Fonts Printer personality support User interface and EIO 12 ppm b/w; 3 ppm color 3.2 ppm b/w; 2.2 ppm color 2.6 ppm b/w; 2.0 ppm color TrueType™ rasterizer in both HP PCL and Adobe PostScript® 45 scalable HP typefaces 136 scalable Adobe PostScript - HP Color LaserJet 8500 | Service Manual - Page 26
Altitude Allowed 0 to 3,048 meters (0 to 10,000 feet) 0 to 3,048 meters (0 to 10,000 feet) Note See the HP Color LaserJet 8550 MFP printer service manual for dimensions that include copy module, automatic document feeder, and 1,000-sheet input paper deck. 24 Chapter 1 - Product information EN - HP Color LaserJet 8500 | Service Manual - Page 27
9296) 8500 Printing: LpA 54 dB(A) Standby: LpA 49 dB(A) Printing: LpA 50 dB(A) Standby: LpA 45 dB(A) Printing: 6.8 B (A) Standby: 6.3 B (A) 8550 LpA 57 dB(A) LpA 52 dB(A) LpA 54 dB(A) LpA 47 dB(A) 7.0 B (A) 6.4 B (A) Printer dimensions Table 6. Printer dimensions Category Printer Printer with - HP Color LaserJet 8500 | Service Manual - Page 28
Consumable storage specifications The life of consumables is greatly affected by their storage environment. Use the following table to determine the shelf life of stored consumables. For consumable replacement specifications, see page 119. Table 7. Consumable storage specifications Temperature - HP Color LaserJet 8500 | Service Manual - Page 29
, be sure to adhere to the environmental specifications listed in this chapter. The following are recommendations for locating and placing the printer: Install in a well-ventilated, dust-free area. Install on a hard, level surface. Install where the temperature and humidity do not change - HP Color LaserJet 8500 | Service Manual - Page 30
Note Space requirements See the HP Color LaserJet 8550 MFP printer service manual for space requirements for the copy module, automatic document feeder, and 1,000-sheet input paper deck. 290 mm 11 in 1404 mm 55 in 1 460 - HP Color LaserJet 8500 | Service Manual - Page 31
problems, and problems requiring service. This service might not be covered by the HP warranty or service agreements. Before purchasing media or specialized forms, test a small quantity in the printer. Make sure your media supplier obtains and understands the media specifications in the HP LaserJet - HP Color LaserJet 8500 | Service Manual - Page 32
Storing media Follow these guidelines when stacking and storing media: Leave media in the wrapper until you are ready to use it. Rewrap partially used packages of media before storing. Stack cartons upright and squarely on top of each other. Store envelopes in a protective box to avoid - HP Color LaserJet 8500 | Service Manual - Page 33
specifications, see the HP LaserJet Printer Family Paper Specification Guide. Table 8. Media guides. Transparencies A4 (landscape) Letter (landscape) 5 mils (0.13 mm) thick Limit to media-fill mark on the media width guides. *A3 full-bleed is not supported by any of the HP CLJ 8500 or 8550 - HP Color LaserJet 8500 | Service Manual - Page 34
105 g/m2) bond Limit to media-fill mark on the media width guides. 2,000 sheets of 20 lb (75 g/m2) bond Limit to media-fill mark on the media width guides. 2,000-sheet input tray *A3 full-bleed is not supported by any of the HP CLJ 8500 or 8550 models. 32 Chapter 1 - Product information EN - HP Color LaserJet 8500 | Service Manual - Page 35
type Media size Media weight Maximum capacity Mailboxes Paper Plain Preprinted Letterhead Prepunched Bond Recycled Color 11 by 17 in A3* A4 JIS B4 Legal Letter 16 to 28 lb bond envelopes *A3 full-bleed is not supported by any of the HP CLJ 8500 or 8550 models. EN Media requirements 33 - HP Color LaserJet 8500 | Service Manual - Page 36
is the maximum area that can be addressed by the laser beam). Recommended print area-the maximum area in which image signals can be printed on media without any loss of image signals, excluding manual feed. Image assurance area-the maximum area in which print quality can be assured, including - HP Color LaserJet 8500 | Service Manual - Page 37
bin for all HP Color LaserJet 8550 printer models. The printer's internal color settings are optimized for the best color quality if Transparency is selected as the media type in the printer driver. Using other media type settings will result in less accurate colors. The printer only supports - HP Color LaserJet 8500 | Service Manual - Page 38
Glossy media If you want the effect of glossy media, use only HP LaserJet soft gloss media in this printer. HP soft gloss is the only glossy media supported by the printer. For ordering information, see page 513. Heavy paper stock Heavy paper stock is any paper from 28 lb to 58 lb (105 to 216 g/m2 - HP Color LaserJet 8500 | Service Manual - Page 39
there is no printing on the page) unless you use the "manual print second side" feature. media with watermarks, if solid fill areas are to be printed transparencies designed for ink jet printers any glossy media other than HP soft gloss media media with texture or finish different from one - HP Color LaserJet 8500 | Service Manual - Page 40
and serial number, find the label located on the rear of the printer, similar to the one shown in figure 2 (the example shown is from an HP Color LaserJet 8500 printer). (serial #) Figure 2. (model #) Example of printer model number and serial number label (110 V and 220 V) 38 Chapter 1 - Product - HP Color LaserJet 8500 | Service Manual - Page 41
). HP Color LaserJet 8500 N The HP Color LaserJet 8500N comes standard with a 100-sheet tray 1, a 500-sheet tray 2, a 500-sheet tray 3, a printer stand, 32 MB RAM, an HP JetDirect print server (10/100 Base-TX), and an internal hard disk. HP Color LaserJet 8500 DN The HP Color LaserJet 8500DN comes - HP Color LaserJet 8500 | Service Manual - Page 42
RAM. HP Color LaserJet 8550 N The HP Color LaserJet 8550N comes standard with a 100-sheet tray 1, a 500-sheet tray 2, a 500-sheet tray 3, a printer stand, 64 MB RAM, an HP JetDirect print server (10/100 Base-TX), and an internal hard disk. HP Color LaserJet 8550 DN The HP Color LaserJet 8550DN comes - HP Color LaserJet 8500 | Service Manual - Page 43
Front view 1 Printer control panel (see page 80) 2 Left (face-up) output bin 7 Top (face-down) output bin 8 Flip-up media stop (HP Color LaserJet 8500 models only) 3 Front door handle 9 Right upper cover 4 Input tray 2 (not included on 10 Input tray 1 the HP Color LaserJet 8550 base model, but - HP Color LaserJet 8500 | Service Manual - Page 44
3 1 4 2 5 Figure 4. Rear view 1 Air filter door 2 Formatter tray 3 Left upper cover 4 Left lower cover 5 Power connector 42 Chapter 1 - Product information EN - HP Color LaserJet 8500 | Service Manual - Page 45
Printer hard disk location (factory-installed on HP Color LaserJet 8500 N, 8500 DN, 8550 N, 8550 DN, 8550 GN, and 8550 MFP models) 4 EIO slot 2 (shown with HP the formatter board. However, the printer does not support two hard disks; the printer can support one hard disk at a time-either internal or external - HP Color LaserJet 8500 | Service Manual - Page 46
and options 1 9 2 3 4 5 6 7 8 Figure 6. Media-handling accessories and options 1 Multi-bin mailbox 2 Multi-bin mailbox status light 3 Duplexer (internal) 4 Tray 2 5 2,000-sheet input tray (tray 4) (only available on 8500 DN, 8550 DN, and 8550 GN models) 6 Tray 4 status light 7 Media transfer - HP Color LaserJet 8500 | Service Manual - Page 47
is not correctly attached to the printer. The accessory is experiencing a hardware malfunction. The accessory is on and ready. The printer might be in Power Save mode. Press GO. The accessory is not receiving power. Check both the power supply and the power cables. EN Printer Information 45 - HP Color LaserJet 8500 | Service Manual - Page 48
energy, and if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is to the printer not expressly approved by HP could void the user's authority to operate this equipment. Use of a shielded interface cable is required to - HP Color LaserJet 8500 | Service Manual - Page 49
HP Color LaserJet 8500 printer DECLARATION OF CONFORMITY according to ISO/IEC Guide 22 and EN 45014 Manufacturer's Name: Manufacturer's Address: Hewlett-Packard 3130, Australia Europe Contact: A Local Hewlett-Packard Sales and Service Office or Hewlett-Packard GmbH, Department HQ-TRE / Standards - HP Color LaserJet 8500 | Service Manual - Page 50
HP Color LaserJet 8550 printer DECLARATION OF CONFORMITY according to ISO/IEC Guide 22 and EN 45014 Manufacturer's Name: Manufacturer's Address: Hewlett-Packard 3130, Australia Europe Contact: A Local Hewlett-Packard Sales and Service Office or Hewlett-Packard GmbH, Department HQ-TRE / Standards - HP Color LaserJet 8500 | Service Manual - Page 51
to ISO/IEC Guide 22 and EN 45014 Manufacturer's Name: Manufacturer's Address: Hewlett-Packard Company Montemorelos 299 Victoria 3130, Australia Europe Contact: A Local Hewlett-Packard Sales and Service Office or Hewlett-Packard GmbH, Department HQ-TRE / Standards Europe, Herrenberger - HP Color LaserJet 8500 | Service Manual - Page 52
according to ISO/IEC Guide 22 and EN 45014 Manufacturer's Name: Manufacturer's Address: Hewlett-Packard Company Montemorelos 299 Guadalajara Victoria 3130, Australia Europe Contact: A Local Hewlett-Packard Sales and Service Office or Hewlett-Packard GmbH, Department HQ-TRE / Standards Europe, - HP Color LaserJet 8500 | Service Manual - Page 53
according to ISO/IEC Guide 22 and EN 45014 Manufacturer's Name: Manufacturer's Address: Hewlett-Packard Company Montemorelos 299 Guadalajara Victoria 3130, Australia Europe Contact: A Local Hewlett-Packard Sales and Service Office or Hewlett-Packard GmbH, Department HQ-TRE / Standards Europe, - HP Color LaserJet 8500 | Service Manual - Page 54
according to ISO/IEC Guide 22 and EN 45014 Manufacturer's Name: Manufacturer's Address: Hewlett-Packard Company Montemorelos 299 Victoria 3130, Australia Europe Contact: A Local Hewlett-Packard Sales and Service Office or Hewlett-Packard GmbH, Department HQ-TRE / Standards Europe, Herrenberger - HP Color LaserJet 8500 | Service Manual - Page 55
to ISO/IEC Guide 22 and EN 45014 Manufacturer's Name: Manufacturer's Address: Hewlett-Packard Company Montemorelos 299 Guadalajara Hewlett-Packard Company, P.O. Box 15 Mail Stop 160, Boise, ID 83707-0015 (Phone: 208-396-6000) Note See the HP Color LaserJet 8550 MFP printer Service Manual - HP Color LaserJet 8500 | Service Manual - Page 56
VCCI statement (Japan)-8500 models VCCI statement (Japan)-8550 models EMI statement (Korea)-8500 models EMI statement (Korea)-8550 models 54 Chapter 1 - Product information EN - HP Color LaserJet 8500 | Service Manual - Page 57
is mandatory for products marketed in the United States. This printer is certified as a "Class 1" laser product under the U.S. Department of Health and Human Services (DHHS) Radiation Performance Standard according to the Radiation Control for Health and Safety Act of 1968. Because radiation emitted - HP Color LaserJet 8500 | Service Manual - Page 58
än i bruksanvisning specificerats, kan användaren utsättas för osynlig laserstrålning, som överskrider gränsen för laserklass 1. HUOLTO HP LaserJet 8500, 8500 N, 8500 DN -kirjoittimen sisällä ei ole käyttäjän huollettavissa olevia kohteita. Laitteen saa avata ja huoltaa ainoastaan sen huoltamiseen - HP Color LaserJet 8500 | Service Manual - Page 59
also stain clothing. Skin and clothing are best cleaned by removing as much toner as possible with a dry tissue, then washing with cold water. Hot water causes toner to melt and permanently fuse into clothing. Material Safety Data Sheet (MSDS) The Toner Cartridge/Drum MSDS can be viewed on the World - HP Color LaserJet 8500 | Service Manual - Page 60
-weighted average and a ceiling limit respectively. All HP LaserJet family printers meet these standards when shipped from the factory. for the operating conditions listed above if you believe ozone emissions are a problem in your area. (Your employer is responsible for providing a work environment - HP Color LaserJet 8500 | Service Manual - Page 61
Technical assistance 64 List Server 64 HP ASAP 64 Dealer Response Line 65 HP Software Distribution Center 66 HP Direct 66 Parts identification 66 Customer Information Centers 66 HP Customer Care Centers 67 Warranty 69 Installation 69 Toner cartridge information 69 EN Chapter contents - HP Color LaserJet 8500 | Service Manual - Page 62
60 Chapter 2 - Service approach EN - HP Color LaserJet 8500 | Service Manual - Page 63
an HP Color LaserJet 8550 MFP printer, first isolate the location of the problem. Usually, simply sending a print job to the printer from a computer is sufficient to determine whether or not the print engine is involved. If it is not, see the service manual specific to the HP Color LaserJet 8550 MFP - HP Color LaserJet 8500 | Service Manual - Page 64
North America) Classes and schedules http://www.hp.com/go/resellertraining Parts Parts information http://outfield.external.hp.com/spi/welcom.htm Ordering consumables Consumable parts and accessories are available directly from Hewlett-Packard at the following numbers: U.S.: (1) (800) 538-8787 - HP Color LaserJet 8500 | Service Manual - Page 65
Ordering field-replaceable units This printer is designed to be repaired by replacing field-replaceable units. Part numbers are located in chapter 8 of this manual and can be ordered from SMO or SME (see page 62). Parts exchange program HP offers remanufactured assemblies for some selected parts. - HP Color LaserJet 8500 | Service Manual - Page 66
machine or fax card. Service-related information includes: service notes (HP Authorized Dealers) Product Data Sheets Material Safety Data Sheets (MSDSs) typeface and accessory information printer support software information toner information driver request form and Software Matrix - HP Color LaserJet 8500 | Service Manual - Page 67
countries listed above, call (31) 20-681-8192. Dealer Response Line For further technical assistance on pre/post-sales and service support, HP dealer service-authorized personnel can contact the Dealer Response Line: (1) (800) 544-9976, U.S. only (1) (800) 363-6584, Canada EN Technical assistance - HP Color LaserJet 8500 | Service Manual - Page 68
Software Distribution Center For printer drivers and application note orders: (1) (805) 257-5565 HP Direct For supplies and accessories orders: (1) (800) 538-8787, U.S. only Customer Support Sales Center For existing hardware and software service agreements: (1) (800) 386-1115, U.S. only For price - HP Color LaserJet 8500 | Service Manual - Page 69
your dealer. Each time you call the HP Customer Care Centers, you will be asked to provide the printer serial number and the original date of 8:30 am until 6:00 pm central European time. Multilingual customer support representatives are available to answer questions. Canadian Customer Care Center ( - HP Color LaserJet 8500 | Service Manual - Page 70
, Monday through Friday Vietnam +84 (0) 8 823 4530 8:00 am to 5:00 pm, Monday through Friday, and 8:00 am to noon pm on Saturday 68 Chapter 2 - Service approach EN - HP Color LaserJet 8500 | Service Manual - Page 71
by service personnel is included with the HP Color LaserJet 8500 DN printer and is required with the HP Color LaserJet 8550 MFP. Installation is optional with all other models of HP Color LaserJet 8500 and 8550 models. Installation can be arranged through the Customer Care Center. Toner cartridge - HP Color LaserJet 8500 | Service Manual - Page 72
Recycling toner cartridges To reduce waste, HP offers a recycling program for used toner cartridges. Cartridge components that do not wear out are recycled. Plastics and other materials are recycled. HP pays the shipping costs from the user to the recycling facility. 70 Chapter 2 - Service approach - HP Color LaserJet 8500 | Service Manual - Page 73
a parallel cable 78 Changing the printer control panel overlay 79 Printer control panel layout 80 Menu maps 82 Information Menu 83 Proof and Print Menu (HP Color LaserJet 8500) . . . . . 84 Quick Copy Jobs Menu (HP Color LaserJet 8550) . . . 84 Private/Stored Jobs Menu (HP Color LaserJet 8550 - HP Color LaserJet 8500 | Service Manual - Page 74
type and size 104 Verifying the printer is installed correctly 105 Configuration page 105 EIO page 105 Verifying DIMM installation 106 Duplex registration (HP Color LaserJet 8550 107 Booklet printing 109 HP TonerGauge (HP Color LaserJet 8550 110 Resetting the HP TonerGauge 110 72 Chapter - HP Color LaserJet 8500 | Service Manual - Page 75
-ROM 4 Manuals: getting started guide and quick reference guide 5 Imaging drum 6 Printer control panel overlay (if applicable) 7 Media size labels 8 Left (face-up) output bin 9 An HP Color LaserJet 8500 (shown above), 8500 N, 8500 DN, 8550, 8550 N, 8550 DN, 8550 GN, or 8550 MFP printer. See Chapter - HP Color LaserJet 8500 | Service Manual - Page 76
are installed Verify that the cables are connected to the printer correctly. Printer with stand Figure 8. Power cord connection WARNING! An unstable printer can tip over and cause injury; verify that the printer is secured properly and the printer wheels are locked. o The power cord plugs into - HP Color LaserJet 8500 | Service Manual - Page 77
-sheet input unit. o The power pack attaches to the back of the printer. o The shorter of the two cables from the power pack plugs into the connector on the back left corner of the printer. o The longer of the two cables from the power pack plugs into the connector on the back left corner - HP Color LaserJet 8500 | Service Manual - Page 78
connection at a time-RJ-45 or BNC. l HP JetDirect 10/100TX print server supports RJ-45 (unshielded twisted pair) cables for 10Base-T or 100Base-TX networks. B A C Figure 10. Network connections The locations of ports on the HP JetDirect internal printer server are: A RJ-45 port (this is the - HP Color LaserJet 8500 | Service Manual - Page 79
the end of the DIN-8 cable into the LocalTalk port. The printer can be connected to a HP JetDirect internal print server installed in EIO port 1. The message should not interfere with normal printing through LocalTalk. If it does not clear within approximately five minutes, there is a problem - HP Color LaserJet 8500 | Service Manual - Page 80
print through the parallel port, the printer requires a 25-pin male/micro 36-pin male ("C-size") parallel cable that is IEEE-1284 compliant. The cable is included with the base model of this printer only. It must be purchased separately for other printer models. 78 Chapter 3 - Operational overview - HP Color LaserJet 8500 | Service Manual - Page 81
Changing the printer control panel overlay Replace the printer control panel overlay with the one included for your language, if applicable. Then configure the printer control panel to show printer messages in your language (see page 97). Figure 12. Changing the printer control panel overlay 1 - HP Color LaserJet 8500 | Service Manual - Page 82
exits menus; will override load tray messages to print on the default media size and type. Menu Allows access to the printer control panel menus to set the printer defaults. This key permits both forward and backward movement through the list of available menus. LCD display Presents data about - HP Color LaserJet 8500 | Service Manual - Page 83
through the available items. Use the right side of the key to activate online help in all HP Color LaserJet 8550 printer models. Ready Indicator (green) l On-The printer is online and able to accept and process data. l Off-The printer is offline and unable to accept or process data. l Flashing-The - HP Color LaserJet 8500 | Service Manual - Page 84
one of the following: l READY if the printer was online l OFFLINE if the printer was offline l an existing error or service message Making selections in the printer control panel menus 1 Press MENU until the menu you want appears on the printer control panel display. 2 Press ITEM until the item you - HP Color LaserJet 8500 | Service Manual - Page 85
Information Menu Press SELECT to print. The printer displays READY when finished. Table 15. Information Menu Item PRINT MENU MAP PRINT CONFIG PAGE Value None None PRINT PCL FONT LIST PRINT PS FONT LIST PRINT LASERJET DEMONSTRATION PRINT FILE DIRECTORY None None None None PRINT EIO PAGE None - HP Color LaserJet 8500 | Service Manual - Page 86
Proof and Print Menu (HP Color LaserJet 8500) This menu appears only if the printer has a hard disk installed. Table 16 to zero to delete the remaining copies. Quick Copy Jobs Menu (HP Color LaserJet 8550) This menu appears only if the printer has a hard disk installed. Table 17. Quick Copy Jobs - HP Color LaserJet 8500 | Service Manual - Page 87
Private/Stored Jobs Menu (HP Color LaserJet 8550) This menu appears only if the printer has a hard disk installed. Table 18. Proof FIRST* (HP Color LaserJet 8500 only) CASSETTE TRAY 1 TYPE= AUTO (8550 only) PLAIN* PREPRINTD LTRHEAD TRNSPRNCY PREPUNCHED LABELS BOND RECYCLED COLOR CARDSTOCK HEAVY - HP Color LaserJet 8500 | Service Manual - Page 88
Appears only if TRAY 1 MODE=CASSETTE. PLAIN* PREPRINTD (plain and preprinted are combined to one menu item on the 8550) LTRHEAD TRNSPRNCY (trays 2 and 3 only) PREPUNCHED BOND RECYCLED COLOR GLOSSY 28# TYPE 1 28# TYPE 2 The TRAY 4 TYPE= option appears only if the 2,000-sheet input unit is properly - HP Color LaserJet 8500 | Service Manual - Page 89
to feed media into the printer by hand rather than automatically from an input tray. The user can select manual feed instead of automatic input printer displays TRAY LOAD . After a delay the printer automatically prints on the default media. The delay time can be changed through HP - HP Color LaserJet 8500 | Service Manual - Page 90
printer control panel. If set to ON, then clearable warnings are displayed until GO is pressed. If set to JOB, then clearable warnings are displayed until the end of the print job. Determines the printer response to consumable low and out messages (including TONER LOW, TRANSFER KIT OUT, FUSER LIFE - HP Color LaserJet 8500 | Service Manual - Page 91
printer control panel display switches when - VALUE + gets to envelope sizes. CONFIGURE CUSTOM PAPER NO (8550 only) YES UNIT OF MEASURE (8550 only) INCHES MILLIMETERS X DIMENSION (8550 only) 3.87 . . . 11.7* Y DIMENSION (8550 are installed. PCL FONT NUMBER= 0 (Courier)* to 999 PCL PITCH= - HP Color LaserJet 8500 | Service Manual - Page 92
PCL SYMBOL SET= COURIER= Value PC-8* ROMAN-8 ISO L1 ISO L2 ISO L5 ISO L6 PC-775 PC-8 DN PC-850 PC-852 PC-8TK PC-1004 WIN L1 WIN L2 WIN L5 WINBALT DESKTOP PS font of the HP LaserJet III printer. REGULAR is the lighter and more accurate Courier font used since the HP LaserJet 4 printer and in books - HP Color LaserJet 8500 | Service Manual - Page 93
markers. PARALLEL ADV FUNCTIONS= ON* OFF 1Default setting for HP Color LaserJet 8550. 2Default setting for HP Color LaserJet 8500. Forces parallel port to compatibility mode, which can be more reliable in some cases, but will not allow the printer status to be sent to the host computer. EN - HP Color LaserJet 8500 | Service Manual - Page 94
values do not change. Resets I/O to known state. Used to clear I/O problems. Used to indicate that a new transfer kit has been installed. Used to indicate that a new fuser kit has been installed. Color Adjust Menu Table 25. Color Adjust Menu Item Value PRINT TEST PAGE None BLACK SMOOTH VALUE - HP Color LaserJet 8500 | Service Manual - Page 95
a formatter board or control board is replaced in the field. l FORMATTER DIAGNOSTICS menu is provided for manufacturing and field service personnel to perform specific diagnostic tests on the formatter board and its related components. • Service personnel can pinpoint problem areas on the formatter - HP Color LaserJet 8500 | Service Manual - Page 96
Service Mode Menu (continued) Service Mode Menu Item NVRAM SETTING (continued) DUPLEX COUNT TRANSFER LIFE LEFT Value FUSER the various color planes. The values are listed on a sticker inside the front of the printer (to the left of the printer control panel and to the - HP Color LaserJet 8500 | Service Manual - Page 97
at error, and error is posted only to the fault log. PAUSE stops at error and the printer control panel displays a message. Press SELECT to continue. Then, error is also posted to the fault log. YES* NO Firmware read-only memory (ROM) is tested. YES* NO Installed DIMMs are tested to verify that - HP Color LaserJet 8500 | Service Manual - Page 98
Mode Menu Item REPETITIONS TRAY 1= TRAY 2= TRAY 3= OUTPUT = DEVELOPER MOTOR REPETITIONS EXECUTE TEST DRUM MOTOR REPETITIONS EXECUTE TEST SENSOR MONITOR EXECUTE TEST Value Description/action 1* . . . 10 ON* OFF ON* OFF ON* OFF TOP OUTPUT BIN* LEFT OUTPUT BIN 1* . . . 10 1* . . . 10 - HP Color LaserJet 8500 | Service Manual - Page 99
selected is the default language until another selection is made by restarting the printer in the configure language mode. 4 Press GO. 5 Turn the printer off and back on. See the HP Color LaserJet 8550 MFP printer Service Manual for information about how to change the display language on the copy - HP Color LaserJet 8500 | Service Manual - Page 100
Installing the consumables When installing a new printer, install the consumables in the printer in this order: 1 Imaging drum 2 Black toner cartridge 3 Color toner cartridges 1 2 3 Figure 14. Consumables installation 98 Chapter 3 - Operational overview EN - HP Color LaserJet 8500 | Service Manual - Page 101
next step. 2 Push the drum into the printer. The protective cover slides off as the drum enters the printer. 3 Swing the lower (green) lever back to the left, making sure it clicks into place. Note If the lever does not return to its original position, make sure that the imaging drum is all the way - HP Color LaserJet 8500 | Service Manual - Page 102
the upper (blue) lever back to the left. Note If the lever does not return to its original position, make sure that the black toner cartridge and the imaging drum are all the way in the printer and that the orange seal was removed from the toner cartridge. 100 Chapter 3 - Operational overview EN - HP Color LaserJet 8500 | Service Manual - Page 103
color toner cartridges 1 With the printer on, press the blue button beneath the carousel door to turn the carousel to a toner cartridge the imaging drum is installed completely 3 l the black toner cartridge is installed completely l the orange seal is removed from the black toner cartridge l - HP Color LaserJet 8500 | Service Manual - Page 104
the carousel rotation button) and repeat steps 3 through 6 for each color. 8 Close the front door. CAUTION To prevent contamination or damage to the printer, do not move the printer after the imaging drum or any of the toner cartridges have been installed. 102 Chapter 3 - Operational overview EN - HP Color LaserJet 8500 | Service Manual - Page 105
the printer driver, then the printer does not feed the media (to prevent toner residue on subsequent pages). In CASSETTE mode, tray 1 functions as a regular input tray. When tray 1 is in CASSETTE mode, load media in tray 1 and configure the media type and size in the printer control panel. 1 Press - HP Color LaserJet 8500 | Service Manual - Page 106
media type, which can result in poor print quality or excessively slow printing. 1 Press MENU until PAPER HANDLING MENU appears on the printer control panel display. 2 Press ITEM until TRAY TYPE = appears on the display. 3 Press - VALUE + until the correct media type appears on the display - HP Color LaserJet 8500 | Service Manual - Page 107
for more information about and examples of configuration pages. To print a configuration page 1 Press MENU until INFORMATION MENU appears on the printer control panel display. 2 Press ITEM until PRINT CONFIG PAGE appears on the display. 3 Press SELECT to print the configuration page. EIO page Use - HP Color LaserJet 8500 | Service Manual - Page 108
Verifying DIMM installation The HP Color LaserJet 8500 printer comes with the following amounts of memory installed in slots 1 and 2: l 16-MB DIMMs in the base and N models l 32-MB DIMMs in the DN model The HP Color LaserJet 8550 printer comes with the following amounts of memory installed in slots - HP Color LaserJet 8500 | Service Manual - Page 109
Duplex registration (HP Color LaserJet 8550) The duplex registration feature allows precise alignment of images on the front and back of a duplexed page. Image placement varies slightly for each input tray. The alignment procedure must be performed for each tray. Y Axis X Axis Tray 2 Duplex - HP Color LaserJet 8500 | Service Manual - Page 110
Note 9 Press ITEM to scroll up through the duplex registration menu until PRINT TEST PAGE appears for the tray you want. 10 Press SELECT to print the page. 11 Repeat step 4 to verify that the lines on the front and back of the page are now properly aligned. If the lines on the front and back do not - HP Color LaserJet 8500 | Service Manual - Page 111
all HP Color LaserJet 8550 printer models and on HP Color LaserJet 8500 models with the PCL upgrade. Booklet printing allows the pages of a print job to be arranged so that the document can be folded and stapled or bound into a book. Booklet printing is supported in PostScript and PCL5c in Windows - HP Color LaserJet 8500 | Service Manual - Page 112
feature is not enabled on HP Color LaserJet 8550 MFP printers. The HP TonerGauge feature allows the user to estimate how much toner is left in the cartridges. The HP TonerGauge indicator appears on the configuration page, on the status tab of the driver, and in HP Web JetAdmin (for the network - HP Color LaserJet 8500 | Service Manual - Page 113
maintenance Chapter contents Cleaning procedures 113 Cleaning the post charger 113 Cleaning the density sensor 114 Cleaning the transfer charger 115 Cleaning the toner catch tray 116 Printer consumables 118 Replacement frequencies 119 Replacing consumables 120 EN Chapter contents 111 - HP Color LaserJet 8500 | Service Manual - Page 114
112 Chapter 4 - Printer maintenance EN - HP Color LaserJet 8500 | Service Manual - Page 115
the post charger on the transfer drum if there are light streaks in halftone areas. To clean the post charger 1 Open the right upper door. 2 Locate the post charger unit cleaner next to the transfer drum handle. 3 Slide the post charger unit cleaner across the bar several times. 4 Push the cleaner - HP Color LaserJet 8500 | Service Manual - Page 116
sensor Clean the density sensor after replacing the imaging drum and when printed colors are inaccurate. To clean the density sensor and erase lamp 1 Open the right upper door. 2 On the inside of the door, locate the density sensor and the density sensor brush. Use the brush to brush off toner - HP Color LaserJet 8500 | Service Manual - Page 117
the transfer charger Clean the transfer charger when irregular wavy patterns appear in solid backgrounds. To clean the transfer charger 1 Open the front door. 2 Find the knob below the transfer charger. 3 Pull the knob out and push it back in. 4 Close the front door. EN Cleaning procedures 115 - HP Color LaserJet 8500 | Service Manual - Page 118
catch tray will not normally have much toner in it. Clean the toner catch tray before moving the printer to another location or when performing routine maintenance at the customer site. 1 Open the front door. 2 Remove the toner catch tray cover by releasing the tab on the right side of the cover - HP Color LaserJet 8500 | Service Manual - Page 119
tray if there is a small amount of toner in the tray. WARNING! Do not use a regular vacuum to clean up toner. The toner can penetrate the vacuum bag, and toner might be harmful if inhaled. Figure 18. Cleaning the toner catch tray 5 Reinstall the toner catch tray and cover, and close the front - HP Color LaserJet 8500 | Service Manual - Page 120
of consumables in printer 1 Color toner cartridges 2 Black toner cartridge 3 Imaging drum 4 Cleaning roller 5 Transfer belt 6 Transfer drum 7 Air filters 8 Transfer charger 9 Pick-up/feed rollers 10 Charcoal filter 11 Fuser HP encourages responsible disposal of HP printer consumables through its - HP Color LaserJet 8500 | Service Manual - Page 121
HP consumables that have been designed to work together in this printer. For an explanation of printer control panel messages, see page 368. Table 27. Replacement frequencies for printer consumables Consumable Printer message Page count Approximate time period1 Black toner cartridge Color toner - HP Color LaserJet 8500 | Service Manual - Page 122
black and color toner cartridges, see page 100 and page 101. Transfer kit Replace the parts in the transfer kit when the printer control panel displays: TRANSFER KIT LOW / REPLACE KIT TRANSFER KIT OUT / REPLACE KIT 1 2 3 5 4 6 Figure 20. Contents of transfer kit 1 Transfer drum 2 Transfer belt - HP Color LaserJet 8500 | Service Manual - Page 123
to the right. 3 Open the upper door on the right side of the printer, and remove the 4 transfer drum. 4 On the right, back wall of the opening, firmly pull the blue knob to release the right end of the cleaning roller. Lift the roller slowly out and to the right to release the - HP Color LaserJet 8500 | Service Manual - Page 124
ends of the new belt in the notches inside the printer. Place the gear side in the notch first to mesh the gear teeth. 10 Rotate the belt down into place. Note Damage to the drum can cause print 11 quality problems. Hold the drum only by the handles. 11 Remove the protective sheet - HP Color LaserJet 8500 | Service Manual - Page 125
20. If it does not, go to step 21. 20 When the printer control panel displays the message, press SELECT to bring the printer online and reset the transfer drum life count. Then go to step 22. 21 If the printer control panel does not display the message: a. Press MENU until RESETS MENU appears on - HP Color LaserJet 8500 | Service Manual - Page 126
imaging drum kit when the printer control panel displays any of the following messages: DRUM LIFE LOW / REPLACE DRUM KIT DRUM LIFE OUT / REPLACE DRUM KIT DRUM ERROR / REPLACE DRUM KIT 3 1 2 Figure 21. Contents of drum kit 1 Two air filters 2 Hand wipe 3 Imaging drum cartridge Imaging drum life - HP Color LaserJet 8500 | Service Manual - Page 127
% of its life remaining. This should allow the user time to order a replacement imaging drum kit before "drum life out." The user can continue to operate the HP Color LaserJet 8500/8550 printer until "drum life out" occurs, at which point the printer will not operate. The user should be advised that - HP Color LaserJet 8500 | Service Manual - Page 128
the front door and open the upper door on the right side of the printer. 7 On the inside of the door, locate the density sensor and the density sensor brush. Use the brush to brush toner particles from the 7 density sensor. Then replace the brush, and close the upper right door. 126 Chapter - HP Color LaserJet 8500 | Service Manual - Page 129
8 8 On the back of the printer, release the two latches on the filter door and lower the door. 9 Remove both close, make sure the filters 9 are in place. Use the hand wipe to remove toner from your hands. 12 Place the used parts in the packaging from the new ones. See the included recycling - HP Color LaserJet 8500 | Service Manual - Page 130
Replace the parts in the fuser kit when the printer control panel displays: FUSER LIFE LOW / REPLACE KIT FUSER LIFE OUT / REPLACE KIT 1 2 3 Figure 22. Note Contents of fuser kit 1 Fuser 2 Hand wipe 3 Six paper rollers The paper rollers are all the same; any of the rollers can be used in any of the - HP Color LaserJet 8500 | Service Manual - Page 131
side of the duplexer and pull the 5 duplexer out of the printer. 4 To unlock the fuser, rotate the blue levers down. 5 On the right side of the fuser, lift the large green lever to release the fuser springs. 6 On the left side of the fuser, rotate 6 the blue gear down two or three times to - HP Color LaserJet 8500 | Service Manual - Page 132
blue tabs on both ends, and then pull the fuser out. 8 Use the blue tabs on the new fuser to slide it into the printer along the guides. On the left side of the fuser, rotate the blue gear up two or three times until the fuser drops into place. 8 CAUTION Use only the blue tabs - HP Color LaserJet 8500 | Service Manual - Page 133
the other three rollers. 5 Replace trays 3 and 2. Note Trays 2 and 3 are not interchangeable. 6 If an optional 2,000-sheet input unit is not attached to the printer, proceed to step 9. If a 2,000-sheet input unit is attached, open the vertical transfer door on the right side of the - HP Color LaserJet 8500 | Service Manual - Page 134
). Note Press down on the lower roller while replacing the upper one. 8 Close the vertical transfer door and 12 turn the printer on. 9 The printer control panel should display the message PRESS SELECT IF FUSER IS NEW. If it displays the message, go to step 10. If it does not, go to step 11. 10 - HP Color LaserJet 8500 | Service Manual - Page 135
Drum kit life detection 154 Transfer kit life detection 156 Color toner lever detection 158 Black toner level detection and cartridge detection . . 159 Environment change control 159 Color calibration density sensor 160 Transfer belt control 161 Cleaning roller control 162 Carousel control - HP Color LaserJet 8500 | Service Manual - Page 136
distribution 164 Fuser control 166 High-voltage power supply circuit 167 Mechanical systems 169 Laser/scanner 169 Motors and heaters 171 Paper path 178 Pick-up/feed 179 Sensors, switches, clutches, and solenoids 184 Fusing and delivery unit 190 Media jam detection 192 Printer timing 192 - HP Color LaserJet 8500 | Service Manual - Page 137
representative with an understanding of the printing process required to service the printer. This chapter discusses the following: Color theory Image formation Paper path Mechanical drive system Control board system Formatter system Power distribution system 2,000-sheet input - HP Color LaserJet 8500 | Service Manual - Page 138
Figure 23 shows a cross-sectional view of the internal components of the printer. 1 2 34 5 30 29 28 27 26 25 24 23 6 7 8 9 10 11 12 13 14 Figure 23. 22 21 20 19 18 17 16 15 Cross-section view of internal components 136 Chapter 5 - Theory of operation EN - HP Color LaserJet 8500 | Service Manual - Page 139
toner cartridge 17 Registration roller 2 Imaging drum 18 Transfer charger 3 Charging roller 19 Upper fusing roller 4 Imaging drum cartridge roller 26 Cleaning roller 27 Left (face-up) output bin 28 Color toner carousel 29 Color toner cartridges 30 Delivery roller(s) EN Introduction 137 - HP Color LaserJet 8500 | Service Manual - Page 140
is used in this printer) and the additive process (which is used in monitors and television). Subtractive color theory The subtractive color theory deals with mixing color pigments (such as those found in toner, ink, and paint) to produce any color. The subtractive primary colors are cyan, yellow - HP Color LaserJet 8500 | Service Manual - Page 141
Half-toning (also called dithering) is a method used to distribute color pigment to create a full spectrum of color. Because this printer places dots of toner on a page to create an image rather than physically mixing the color (like paint), the dots are distributed in selected patterns. Although - HP Color LaserJet 8500 | Service Manual - Page 142
, and green. Adding various levels of these colors, which are generated by a light source (such as a color monitor), produces all other colors. Mixing equal amounts of the additive primary colors produces the colors indicated in table 30. Table 30. Additive color mixing Mix equal amounts of... To - HP Color LaserJet 8500 | Service Manual - Page 143
Image formation Figure 24 and figure 25 give an overview of the image formation process. Figure 24. Image formation EN Image formation 141 - HP Color LaserJet 8500 | Service Manual - Page 144
formation and paper pick-up that occur during the electrostatic latent image formation block. Figure 25. Electrostatic latent image formation block Note In the following sections, the text is numbered to match each of the numbered steps in the process flowchart above. 142 Chapter 5 - - HP Color LaserJet 8500 | Service Manual - Page 145
and black-and-white laser imaging is that the color image is created with multiple layers. This printer contains four toner cartridges (cyan, magenta, yellow, and black). The electrostatic latent image formation block consists of three steps for forming the image on the imaging drum. At the end of - HP Color LaserJet 8500 | Service Manual - Page 146
are applied to the primary charging roller to create uniform negative potential charge on the drum surface. Figure 27. Primary charging of imaging drum 3. Laser beam exposure When the laser beam scans the imaging drum surface, the charge on the exposed area is decreased. This area then forms the - HP Color LaserJet 8500 | Service Manual - Page 147
the toner particles to the imaged region on the imaging drum. The three color cartridges are brought into contact with the imaging drum when the carousel rotates. The black toner cartridge is set separately, and is always in contact with the imaging drum. When the area on the imaging drum exposed - HP Color LaserJet 8500 | Service Manual - Page 148
transfer A positive DC bias is applied to the transfer drum during printing to transfer the toner that is on the imaging drum to the transfer drum. This process occurs in sequence for the four colors (yellow, magenta, cyan, black). For full-color printing, as the transfer steps proceed for the four - HP Color LaserJet 8500 | Service Manual - Page 149
the appropriate bias to the toner that is on the transfer drum and to increase the efficiency of the secondary transfer. The post charging unit is turned on during the yellow toner primary transfer as well as after the entire image is formed. During the yellow toner transfer, the negative charge is - HP Color LaserJet 8500 | Service Manual - Page 150
jam, negative DC bias is applied to the transfer belt to transfer any residual toner from the transfer belt. The residual toner moves back to the transfer drum, and is then collected in the waste toner case in the imaging drum. Figure 31. Secondary transfer 148 Chapter 5 - Theory of operation EN - HP Color LaserJet 8500 | Service Manual - Page 151
8. Separation The paper is separated from the transfer drum because of the paper's elasticity. When duplex printing or overhead transparency (OHT) printing is performed, charger to prevent discharge between the paper and the transfer belt, which can disrupt the image. Figure 32. Separation EN - HP Color LaserJet 8500 | Service Manual - Page 152
This block follows two steps to clean the transfer drum. Even though most of the toner is transferred to the paper during secondary transfer, some toner particles remain on the transfer drum surface. This residual toner on the transfer drum is returned to the imaging drum, where it will be moved to - HP Color LaserJet 8500 | Service Manual - Page 153
transfer drum is positive. Because the charge on the residual toner is made positive by the transfer drum cleaning roller, the toner moves from the transfer drum to the imaging drum, where it will be removed during imaging drum cleaning. Figure 34. Transfer drum cleaning EN Image formation 151 - HP Color LaserJet 8500 | Service Manual - Page 154
primary transfer, not all of the toner on the imaging drum is transferred to the transfer drum, leaving some toner on the imaging drum surface. Also, additional toner is placed on the imaging drum surface when the transfer drum is cleaned. 11. Imaging drum cleaning To prepare for the next printing - HP Color LaserJet 8500 | Service Manual - Page 155
on the paper during transfer adheres to the paper by static electricity, and a light touch will smear the image. During fusing, the four toner colors are melted on the paper to create a permanent image. 12. Fusing The surfaces of the upper and lower fusing rollers are coated with silicone, which has - HP Color LaserJet 8500 | Service Manual - Page 156
to the time the waste toner recovers the window. If the time is shorter than a stored value in the controller board, DRUM ERROR / REPLACE DRUM KIT is reported on the printer control panel. The controller board writes the data into the imaging drum cartridge memory. The printer is still able to print - HP Color LaserJet 8500 | Service Manual - Page 157
stops the printer and signals DRUM LIFE OUT / REPLACE DRUM KIT. Printing cannot continue without a new imaging drum being installed. If the imaging drum cartridge memory fails, a warning will be displayed on the printer control panel. Printing can continue until the waste toner sensor indicates full - HP Color LaserJet 8500 | Service Manual - Page 158
by the TONER LOW setting on the printer control panel (see page 88). Printing can continue after the fuser life out signal, but print quality might be degraded. Color toner level detection The color toner level sensor (PS621) detects the toner level in the color toner cartridge. PS621 consists - HP Color LaserJet 8500 | Service Manual - Page 159
window exceeds the fixed time. The printer detects the toner level when the printer is turned on, or while the stirring plate is rotating. Light receiver Light emitter Figure 38. Color toner level detection Color cartridge sensor The color cartridge sensor (PS1901C) detects the color toner - HP Color LaserJet 8500 | Service Manual - Page 160
light emitter is reflected by the color toner lever and detected by the light receiver. The controller board monitors the sensor when the carousel door is closed. If the color toner lever is not locked in place, LOCK TONER LEVER is shown on the printer control panel and the carousel will not rotate - HP Color LaserJet 8500 | Service Manual - Page 161
of the secondary transfer bias, the transfer drum cleaning bias, and the transfer charger bias. Performs a color calibration if the environmental change is great enough. The controller board checks for an environment change before starting image density control, after the power is turned on, or - HP Color LaserJet 8500 | Service Manual - Page 162
(if Power Save has been on for more that 30 minutes) When a toner cartridge is installed When an imaging drum cartridge is installed When environment is changed by the environment change control The density control will only be executed if all of the printer doors are closed and all of the - HP Color LaserJet 8500 | Service Manual - Page 163
(CL4). The transfer belt is normally away from the transfer drum, except while pushed against the transfer drum during secondary transfer. When the secondary transfer is complete, the transfer belt is removed from the transfer drum when the controller board sets the CL4 to off. Figure 41. Transfer - HP Color LaserJet 8500 | Service Manual - Page 164
off to detach the cleaning roller from the transfer drum. Figure 42. Cleaning roller control Carousel control The controller board controls the rotation speed and the stop position of the carousel by monitoring the timing of the eight flags that pass through the carousel position sensor (PS3). The - HP Color LaserJet 8500 | Service Manual - Page 165
an example of the carousel in the yellow cartridge stop position where the printer is ready for yellow development. The yellow toner cartridge is facing the imaging drum. Figure 43. Carousel control Carousel stop solenoid The carousel lock control fixes the carousel by pushing the stopper lever - HP Color LaserJet 8500 | Service Manual - Page 166
operates. The +24V source feeds the various motors, solenoids, and exhaust fans within the printer, while the +5V source feeds the controller board and image processor. High-voltage power supply/ Separation discharge highvoltage converter PCA Figure 44. Power distribution circuit diagram 164 - HP Color LaserJet 8500 | Service Manual - Page 167
, and toner cartridge motor are turned off. After the fuser cools down, all fans are also turned off. When the printer receives the "wake up" command from the formatter board, the printer leaves Power Save mode and resumes normal operation. High-voltage power supply Developer/ imaging drum bias - HP Color LaserJet 8500 | Service Manual - Page 168
Color mode Number of sheets Full color Problems in the fuser can be detected in the following three circuits: Controller board. If the fuser controller board interrupts power to the fuser heaters. From there, the formatter assesses the fusing heater failure and signals the printer control panel - HP Color LaserJet 8500 | Service Manual - Page 169
46) that are directly controlled by the controller board: Developer/imaging drum bias supply, which controls: • cartridge motor (M3) • imaging drum bias • black developing bias • color developing bias High-voltage power supply, which controls: • transfer drum • cleaning roller • transfer belt - HP Color LaserJet 8500 | Service Manual - Page 170
Developer/imaging drum bias supply High-voltage power supply Figure 46. High-voltage power supply circuit 168 Chapter 5 - Theory of operation EN - HP Color LaserJet 8500 | Service Manual - Page 171
signal (the internal signal of the laser/scanner unit) in the laser driver PCA, which turns the laser diode on and off and generates the point on the imaging drum. The scanning mirror rotates at a constant speed, so the laser beam is scanned across the drum at a constant speed. The drum is also - HP Color LaserJet 8500 | Service Manual - Page 172
Figure 47. Laser/scanner If the laser/scanner motor does not reach operating speed within seven seconds of rotation, then the laser/scanner motor lock detection circuit generates a scanner motor failure, and the laser/ scanner motor stops. 170 Chapter 5 - Theory of operation EN - HP Color LaserJet 8500 | Service Manual - Page 173
and heaters Table 32. Printer motor and heater names and descriptions Name M1 M2 M3 M4 M5 Description Carousel motor Drum motor Cartridge motor Main motor Pick-up motor Name FM1 FM2 FM3 HU HL Description Fan 1 motor Fan 2 motor Fan 3 motor Upper fuser heater Lower fuser heater EN Mechanical - HP Color LaserJet 8500 | Service Manual - Page 174
Carousel motor (M1) The carousel motor (M1) is a two-phase stepping motor, and rotates the carousel. The motor operates at low and normal speeds depending on the printer function (such as sensing toner cartridges or printing). Figure 49. Carousel motor (M1) 172 Chapter 5 - Theory of operation EN - HP Color LaserJet 8500 | Service Manual - Page 175
stepping motor, and drives the transfer drum and the imaging drum. For overhead transparencies and glossy or heavy media, the motor rotates at low speed (OHT mode: 1/4 speed rotation; glossy and heavy media: 1/3 speed rotation). The speed of the media through the fuser is identical to the speed at - HP Color LaserJet 8500 | Service Manual - Page 176
M3) is a two-phase stepping motor, and drives the black and color toner cartridge developing cylinders. The motor rotates in the normal direction for color toner development, then the motor reverses for black toner development. The developer gear drive assembly and its associated clutches engage the - HP Color LaserJet 8500 | Service Manual - Page 177
drives the rollers related to pick-up, feeding, fusing, and delivery. This motor also drives the transfer belt press drive cam and cleaning roller press drive cam. The controller board switches the motor speed between normal speed, 1/4 speed for OHT mode, and 1/3 speed for glossy or heavy media by - HP Color LaserJet 8500 | Service Manual - Page 178
Pick-up motor (M5) The pick-up motor (M5) is a two-phase stepping motor. M5 picks up the paper, drives tray 2 and 3 tray lifts, and activates the pick-up rollers for trays 2 and 3. During tray 2 paper pick-up, M5 is rotated at normal speed. During tray 3 pick-up, normal speed reverse rotation is - HP Color LaserJet 8500 | Service Manual - Page 179
which use DC brushless motors. Table 33 describes when each of the fans operates and at what speed each operates. Table 33. Fan operation Turn printer on Standby Printing Power Save or Power Save or power off 30 minutes minutes FM1* Full speed On On On Off FM2 - HP Color LaserJet 8500 | Service Manual - Page 180
Paper path Figure 54 shows the printer paper path. Figure 54. Paper path 178 Chapter 5 - Theory of operation EN - HP Color LaserJet 8500 | Service Manual - Page 181
image on the transfer drum. After that, the paper is fed through the transfer, separation, and fusing/delivery units to the top (face-down) or the left (face-up) output bin. The printer the printer driver or by selecting OHT as the media type at the printer control panel. The OHT sensors (PS1801 - HP Color LaserJet 8500 | Service Manual - Page 182
detection - The last-page sensor (PS29) consists of a light printer and does not reach the light receiver. The controller board signals the formatter that there is no paper in tray 2 and stops formation of the next image. The tray 2 last-page detection prevents the imaging drum and the transfer drum - HP Color LaserJet 8500 | Service Manual - Page 183
Figure 55. Tray 2 and 3 pick-up 1 Pick-up motor drive signal M4 Main motor 2 Feed roller clutch drive signal M5 Pick-up motor 3 Tray pick-up solenoid drive signal SL3 Tray pick-up solenoid 4 Registration roller clutch drive signal CL1 Registration roller clutch 5 Main motor drive signal CL2 - HP Color LaserJet 8500 | Service Manual - Page 184
sends an off to signal the controller board. The controller board then signals the formatter that no pages are in tray 1 and stops the next image formation. The PS19 detects no page before the next image is written and prevents the imaging drum and the transfer drum from getting dirty. 182 Chapter - HP Color LaserJet 8500 | Service Manual - Page 185
plate solenoid CL1 Registration roller clutch CL3 Tray 1 pick-up clutch PS1 Registration roller paper sensor PS19 Tray 1 last page sensor PS1301 Tray 1 page sensor PS1302 Lifting plate position sensor PS1701 Tray 1 paper width sensor PS1801 OHT sensor 1 PS1802 OHT sensor 2 EN Paper path 183 - HP Color LaserJet 8500 | Service Manual - Page 186
Sensors, switches, clutches, and solenoids The following figures and tables illustrate and describe the sensors, switches, clutches, and solenoids in the printer paper path. Figure 57. Printer sensors 184 Chapter 5 - Theory of operation EN - HP Color LaserJet 8500 | Service Manual - Page 187
3 sensor Tray 2 sensor Tray 3 paper-level sensor 2 Tray 3 paper-level sensor 1 Tray 2 paper-level sensor 2 Tray 2 paper-level sensor 1 Tray 3 paper-out sensor Tray 2 paper-out sensor Tray 1 paper sensor Lifting plate position sensor OHT sensor 1 OHT sensor 2 Color toner cartridge sensor Color toner - HP Color LaserJet 8500 | Service Manual - Page 188
Figure 58. Printer switches 186 Chapter 5 - Theory of operation EN - HP Color LaserJet 8500 | Service Manual - Page 189
Table 36. Printer switch names and descriptions Name SW1 SW201 SW202 SW641 SW642 SW644 SW671 SW672 SW673 SW1601 SW1602 SW1603 SW1604 SW1601 SW1602 SW1603 SW1604 Description Power switch Test-print switch Reset switch Right cover switch Imaging-drum switch Black toner cartridge switch Delivery - HP Color LaserJet 8500 | Service Manual - Page 190
Switch functionality The following table describes the functionality of the paper-size switches in the printer. Table 37. Tray 2 and Tray 3 paper-size detection Paper size Paper-size detection switches SW1601 SW1602 SW1603 A3 Off On Off A4 (horizontal) Off Off - HP Color LaserJet 8500 | Service Manual - Page 191
Figure 59. Printer clutches and solenoids Name CL1 CL2 CL3 CL4 SL1 SL2 Description Registration roller clutch Feed roller clutch Tray 1 pick-up roller clutch Transfer belt press clutch Cleaning roller press solenoid Left (face-up) output bin solenoid Name SL3 SL4 SL5 Description Tray 2 and tray - HP Color LaserJet 8500 | Service Manual - Page 192
by the main motor (M4). Paper separated from the transfer drum is fed into the fuser and delivered from the unit via the fusing roller and the fusing delivery roller. The fusing delivery sensor detects paper delivered from the fuser. The printer has a left (face-up) output bin and a top (face-down - HP Color LaserJet 8500 | Service Manual - Page 193
paper full detection signal 4 Fusing delivery detection signal 5 Main motor (M4) drive signal PS10 Top (face-down) output bin paper full sensor PS11 Top (face-down) output bin delivery sensor PS1903 Fusing delivery sensor SL2 Left (face-up) output bin solenoid M4 Main motor EN Paper path 191 - HP Color LaserJet 8500 | Service Manual - Page 194
stops printing and signals a jam condition to the formatter board. Printer timing The formatter PCA and controller board PCA share information during the printer operation. This information consists of printer status, command, and dot-image data. Figures 61 through 66 show the timing of different - HP Color LaserJet 8500 | Service Manual - Page 195
Figure 61. EN Timing chart for WAIT period (1 of 2) Printer timing 193 - HP Color LaserJet 8500 | Service Manual - Page 196
Figure 62. Timing chart for WAIT period (2 of 2) 194 Chapter 5 - Theory of operation EN - HP Color LaserJet 8500 | Service Manual - Page 197
Figure 63. EN Timing chart, printing full-color letter-sized page (1 of 2) Printer timing 195 - HP Color LaserJet 8500 | Service Manual - Page 198
Figure 64. Timing chart, printing full-color letter-sized page (2 of 2) 196 Chapter 5 - Theory of operation EN - HP Color LaserJet 8500 | Service Manual - Page 199
Figure 65. EN Timing chart, printing full-color 11-by-17-inch page (1 of 2) Printer timing 197 - HP Color LaserJet 8500 | Service Manual - Page 200
Figure 66. Timing chart, printing full-color 11-by-17 inch page (2 of 2) 198 Chapter 5 - Theory of operation EN - HP Color LaserJet 8500 | Service Manual - Page 201
power switch is turned on. The EPH controller board on the printer sends a power-on signal to the power supply on the 2,000-sheet input unit. When the signal is high, the power supply provides both +24 V and +5 V to the paper deck driver. The +24V drives the motors, clutches, and solenoids for - HP Color LaserJet 8500 | Service Manual - Page 202
12 Pickup roller 3 CL32 Main drive clutch 13 Separation roller 4 PS35 Vertical transfer unit (VTU) closed 14 Controller board PCA sensor 5 CL31 VTU clutch 15 'Diagnostic LEDs 6 MT31 Main motor 7 SW601 - SW602 Paper quantity switches 16 Normal/diagnostic mode switch 8 SW701 - SW704 - HP Color LaserJet 8500 | Service Manual - Page 203
by the PS33 sensor. The paper level is detected by switches SW601 and SW602. The paper size is detected by switches SW701 through SW704. When the EPH controller board on the printer sends an input command to the controller board PCA on the 2,000-sheet input unit, the paper deck driver runs the pick - HP Color LaserJet 8500 | Service Manual - Page 204
Switch functionality The following tables describe the functionality of the paper-quantity and paper-size switches in the 2,000-sheet input unit. Table 38. Paper-quantity detection switches SW601 Off On On Off SW602 Off Off On On Remaining paper 100% 75% 50% 25% Table 39. Paper-size detection - HP Color LaserJet 8500 | Service Manual - Page 205
number of sheets decreases. Once the paper stack decreases to a certain level, the PS34 sensor registers a low condition. Then the paper deck driver turns on the lifter motor again and lifts the paper stack until the PS34 sensor registers sufficient paper in the tray. EN 2,000-sheet input unit 203 - HP Color LaserJet 8500 | Service Manual - Page 206
Paper path Figure 68 illustrates the paper path components in the 2,000-sheet input unit. 5 2 1 34 6 7 8 Figure 68. 2,000-sheet input unit paper path 1 Lifting plate 2 Paper stack 3 Pick-up roller 4 Feed roller 5 Upper VTU rollers 6 VTU 7 Lower VTU rollers 8 Separation roller 204 Chapter 5 - - HP Color LaserJet 8500 | Service Manual - Page 207
bin (at the top). If a multi-bin mailbox bin is full, the printer automatically sends the job to the next available bin. If there are more jobs will start again at the top facedown bin. This process is seen in the printer software as one logical bin. Virtual stacker mode - Printed sheets are - HP Color LaserJet 8500 | Service Manual - Page 208
The network administrator chooses the mode of operation through an HP network configuration utility, such as the HP JetAdmin software or the HP LaserJet utility for the Macintosh. Additionally, on all workstations that print to the printer, the printer driver might need to be set up to reflect the - HP Color LaserJet 8500 | Service Manual - Page 209
the multi-bin mailbox is handled through the EPH controller board on the printer. The information coming from the EPH controller board is carried by the C-link cables that connect the EPH controller board PCA to all the devices that support the C-link protocol. Figure 69 shows the C-link connections - HP Color LaserJet 8500 | Service Manual - Page 210
Sensors, switches, motors, and controller board PCA Figure 70 and table 40 illustrate and describe the multi-bin mailbox sensors, switches, motors, and controller board PCA. 10 1 11 2 12 13 3 4 5 14 6 7 15 8 9 Figure 70. Multi-bin mailbox sensors 208 Chapter 5 - Theory of operation EN - HP Color LaserJet 8500 | Service Manual - Page 211
PSFaceFull Left-output-bin-full sensor PSEntry Paper-entry sensor PSExit1 Paper-delivered-to-head sensor M4 Ejector motor Controller board PCA Receiving paper The printer delivers paper to the multi-bin mailbox through the face-up delivery slot (input paper guide) at a rate of 107 mm - HP Color LaserJet 8500 | Service Manual - Page 212
paper path 14 15 17 16 18 19 1 Face-up bin 2 Delivery head motor 3 Blind cover 4 Bin 1 5 Face-down bins 6 Bin 8 7 Controller board PCA 8 Flipper assembly 9 Input paper guide 10 Home position 11 Delivery head line 12 Metal tape 13 Delivery head assembly 14 Eject rollers 15 Metal tape 16 - HP Color LaserJet 8500 | Service Manual - Page 213
-sheet stapler/stacker Device configuration The HP 3,000-sheet stapler/stacker and the HP 3,000-sheet stacker attach to printers' left sides. 3,000-sheet stapler/stacker Set the default offset action and default stapler action at the printer control panel under Configuration of Stkr. The options - HP Color LaserJet 8500 | Service Manual - Page 214
jam condition or a hardware malfunction is indicated through the printer control panel and the user LED is lit amber. C-link communication Communication and control of the C-link devices is accomplished through the paper-handling controller embedded on the formatter PCA (printed circuit assembly) in - HP Color LaserJet 8500 | Service Manual - Page 215
(FLEntry): • paper in the flipper at power on or after clearing a paper jam (when either sensor is activated at power on or after clearing a jam) • paper jammed before entering the flipper (when the printer sends a message that pages are being sent to the stapler/ stacker or stacker, but FLEntry1 is - HP Color LaserJet 8500 | Service Manual - Page 216
Paper path Paper input The device receives paper from the printer at different speeds-106, 117, or 147 mm/second-depending on the printer in use. Flipper Paper arrival is sensed by FLEntry1, which activates the flipper motors. For face-up printing, the flipper simply delivers paper sensed by - HP Color LaserJet 8500 | Service Manual - Page 217
) Face-down paper path Path through accumulator Interlock switch Paper input from the printer Flipper Flipper exit sensor (FLExit) Accumulator exit sensor (ACExit) Gear wheel sensor (GWSens) Accumulator Stapler/carriage Controller PCA Power supply Figure 73. Stapler/stacker paper path and - HP Color LaserJet 8500 | Service Manual - Page 218
Flipper entry sensor (FLEntry) Flipper entry sensor 1 (FLEntry1) Face-down paper path Path through offset module Interlock switch Paper input from the printer Flipper Flipper exit sensor (FLExit) Exit sensor (Exit) Offset module Figure 74. Stacker paper path and sensors Controller PCA Power - HP Color LaserJet 8500 | Service Manual - Page 219
cover assembly 232 Left covers and doors 234 Right covers and doors 238 Rear cover 243 Top assemblies 245 Control panel 246 Laser/scanner unit 247 Face-down output assembly 249 Front assemblies 251 Toner lock sensor and color cartridge sensor 251 Subrelay PCA 252 EN Chapter contents 217 - HP Color LaserJet 8500 | Service Manual - Page 220
Registration roller assembly 263 Paper photo (OHT) sensors 265 Density sensor 266 Paper pick-up assembly 267 Tray 1 pick-up assembly 268 Rear assemblies 270 Formatter pan 272 Fan 1 274 Fan 2 275 Power supply 276 Controller board 277 Cartridge motor (M3 280 Main motor (M4 281 Carousel - HP Color LaserJet 8500 | Service Manual - Page 221
cover 299 Back cover 300 Left cover 301 Vertical transfer unit 302 Right cover 304 Tray 4 305 Paper pick-up assembly 306 Controller PCA 307 Front LED PCA assembly 308 Power supply 309 Main drive assembly 310 Paper-size sensor assemblies 311 Tension springs 313 EN Chapter contents 219 - HP Color LaserJet 8500 | Service Manual - Page 222
bins and blind cover 318 Flipper assembly 319 Delivery head position motor 321 Transport belt motor 322 Input paper guide 323 Metallic tape and housing assembly 325 Controller PCA 327 Anti-curl strings 329 Delivery head assembly 331 Interlock switch 334 Diagnostic LED PCA 335 User status - HP Color LaserJet 8500 | Service Manual - Page 223
EN Chapter contents 221 - HP Color LaserJet 8500 | Service Manual - Page 224
sheet-metal parts. CAUTION Always protect the imaging drum from light and physical contact when removed from the printer. HP recommends reinstalling the original cover whenever the drum is removed from the printer. Electrostatic discharge (ESD) The printer contains parts that are sensitive to - HP Color LaserJet 8500 | Service Manual - Page 225
CAUTION Required tools The following tools are needed to service the printer: Phillips #1 magnetized screwdriver, 6-inch (152-mm) shaft Phillips #2 magnetized screwdriver, 6-inch (152-mm) shaft T-10, T-15, and T-20 Torx driver, 6-inch (152-mm) shaft Flat-blade #2 screwdriver Small pair of - HP Color LaserJet 8500 | Service Manual - Page 226
maintenance. Chapter 4 explains the maintenance procedures. Color toner cartridges Transfer charger Black toner cartridge Imaging drum Air filters Transfer drum Transfer belt Cleaning roller Charcoal filter Fuser Paper rollers The printer keeps track of use on some of its - HP Color LaserJet 8500 | Service Manual - Page 227
Doors and covers The following figures show the orientation of the printer and paper handling accessories as they are referred to in this chapter. 1 2 3 Front 4 5 6 7 8 Right Figure 75. Orientation of printer and accessories: top, front, and right 1 Top cover assembly 2 Front cover 3 Front - HP Color LaserJet 8500 | Service Manual - Page 228
3 1 4 5 2 Rear Left Figure 76. Orientation of printer and accessories: rear and left 1 Exhaust fan cover 2 Rear cover 3 Left upper cover (includes the left upper door) 4 Left rear cover 5 Left lower cover 226 Chapter 6 - Removal and replacement EN - HP Color LaserJet 8500 | Service Manual - Page 229
8500 MFP printer-separating the printer from the frame 1 Remove two screws (callout 1) from the attachment cover on the left side of the printer to release the attachment cover. 2 Remove two screws (callout 2) from the attachment bracket. 12 2 Figure 77. Attachment bracket, HP Color LaserJet 8550 - HP Color LaserJet 8500 | Service Manual - Page 230
Front covers and panels Removing the front cover 1 Open the front cover. 2 Remove one screw holding the strap in place (callout it up to remove it. Callout 3 is the tag that shows engine settings; sections of Chapter 6, "Troubleshooting" refer to the tag. 228 Chapter 6 - Removal and replacement EN - HP Color LaserJet 8500 | Service Manual - Page 231
Removing the front right cover 1 Open the front door. 2 Remove one screw in the upper right-hand side that holds the front right cover on (callout 1). 12 Figure 80. Front right cover 3 Pull the cover off. EN Doors and covers 229 - HP Color LaserJet 8500 | Service Manual - Page 232
(see page 228). 2 Remove the top cover assembly (see page 232). 3 Remove eight screws on the inside panel (callout 1). 2 12 32 42 12 Figure 81. Inside left panel 4 Remove the waste toner tray cover (callout 2) by releasing the tab on the right side of the cover with a small screwdriver. 5 Remove - HP Color LaserJet 8500 | Service Manual - Page 233
the filler panel for tray 2 (HP Color LaserJet 8550 base model) 1 Open the front cover. 2 Release the tab at the top, towards the right, of the filler panel and rotate the top of the filler panel toward you. Figure 82. Filler panel for tray 2 Note One screw secures the filler panel bracket. To - HP Color LaserJet 8500 | Service Manual - Page 234
Top cover assembly 1 Remove the front right cover (see page 229). Leave the front door open. 2 Open the left door and loosen the two screws (callout 1). 12 Figure 83. Screws behind left door 3 Open the right door and loosen the two screws (callout 2). 2 Figure 84. Screws behind right door 4 - HP Color LaserJet 8500 | Service Manual - Page 235
5 Lift the cover up and unplug the connector (callout 3) at the rear of the cover. 32 Figure 85. Connector on top cover 6 Remove the top cover assembly. EN Doors and covers 233 - HP Color LaserJet 8500 | Service Manual - Page 236
Left covers and doors Removing the left rear cover 1 Open the left upper door. 2 Support the door and squeeze the prong with needle-nose pliers to unhook the strap holding the door to the left rear cover (callout 1). 12 Figure 86. Left door and strap 234 Chapter 6 - Removal and replacement EN - HP Color LaserJet 8500 | Service Manual - Page 237
3 Remove 11 screws (callout 2). 2 2 Figure 87. Screws on left rear cover 4 Pull the cover to the left and off. EN Doors and covers 235 - HP Color LaserJet 8500 | Service Manual - Page 238
Removing the left upper cover 1 Remove the left rear cover (see page 234). 2 Remove two screws on the rail (callout 1, one screw is on the left side of the cover and the other is located inside the front cover). 12 Figure 88. Screws on upper left door 3 Remove the door. 236 Chapter 6 - Removal - HP Color LaserJet 8500 | Service Manual - Page 239
Removing the left lower cover 1 Open the left lower cover. 2 Push the spring-loaded stopper hinges (callout 1) towards the printer and down to release them. 12 Figure 89. Stopper hinges on lower left cover 3 Move the cover to a 45-degree angle and lift the right - HP Color LaserJet 8500 | Service Manual - Page 240
right upper door. 3 On the right side of the door, unplug four connectors that lead through the printer frame to the right upper cover (callout 1). Two connectors are plugged into the controller board, and two connectors are inline connectors. It might be easier to disconnect the connectors from the - HP Color LaserJet 8500 | Service Manual - Page 241
5 With needle-nose pliers, remove the e-ring from the hinge (callout 2) on the left side of the door. 2 Figure 91. E-ring 6 Remove the front right cover (see page 229). 7 Rotate the plastic tab (located on the left hinge) in an upward direction to a 90-degree angle. 8 Lift the door slightly to the - HP Color LaserJet 8500 | Service Manual - Page 242
Note Note Removing the right cover subassembly Use this procedure if you want to separate the right cover subassembly from the right upper cover. 1 Open the right upper cover assembly slightly. 2 Pull the right side of the subassembly slightly to the right and pull outward on the right side to snap - HP Color LaserJet 8500 | Service Manual - Page 243
Removing the right rear cover 1 If you have a 2,000-sheet input unit, open the VTU. 2 Remove one screw (callout 1). 12 Figure 93. Right rear cover 3 Pull the bottom of the cover out and then down to remove the cover. EN Doors and covers 241 - HP Color LaserJet 8500 | Service Manual - Page 244
Removing the right lower cover assembly 1 Remove the front right cover (see page 229). 2 If you have a 2,000-sheet input unit, open the VTU. 3 Remove the right rear cover (see page 241). 4 Remove four screws on the right lower cover in place (callout 1). 12 Figure 94. Screws on the right lower - HP Color LaserJet 8500 | Service Manual - Page 245
Rear cover 1 For HP Color LaserJet 8550 MFP printer models, complete the following steps before continuing to step 2 on the following page: a Release inside the opening; the plate remains attached to the rear cover. 12 2 Figure 95. Plate, HP Color LaserJet 8550 MFP printer EN Doors and covers 243 - HP Color LaserJet 8500 | Service Manual - Page 246
2 Remove the rear lower left cover (one screw) (callout 1). 2 42 32 12 42 Figure 96. Note Rear cover 3 Remove the left rear cover (see page 234). 4 Open the right upper door. 5 Remove three screws in the sheet metal tab (callout 2). 6 Remove the right rear cover (see page 241). 7 Remove two - HP Color LaserJet 8500 | Service Manual - Page 247
Top assemblies Gain access to the following assemblies from the top of the printer: control panel laser/scanner unit face-down output assembly EN Top assemblies 245 - HP Color LaserJet 8500 | Service Manual - Page 248
. 3 Remove four screws attaching the control panel to the top cover (callout 1). 2 12 Figure 97. Bottom of the control panel 4 Remove three screws from the bar on the bottom of the control panel that is holding the wires in place (callout 2). 5 Release the cable stays. 6 Remove the assembly. 246 - HP Color LaserJet 8500 | Service Manual - Page 249
assembly (see page 232). 2 On HP Color LaserJet 8550 printer models, remove four screws, two on each side (callout 1 shows two of them), from the laser/ scanner shield and lift the shield out of the printer (the shield is not present on HP Color LaserJet 8500 printer models). 12 Figure 98. Laser - HP Color LaserJet 8500 | Service Manual - Page 250
3 Remove four screws (callout 1) from the laser/scanner unit. 12 2 Figure 99. Scanner unit 4 Release the wires from the cable stay. 5 Unplug the two connectors (callout 2). 6 Gently remove the laser/scanner unit and place it in an ESD pouch. 248 Chapter 6 - Removal and replacement EN - HP Color LaserJet 8500 | Service Manual - Page 251
Remove the left upper cover (see page 236) 4 On the top of the printer, remove the black airflow vent by releasing the cut tab (callout 1) and sensor rail (callout 2). 32 2 Figure 101. Face-down exit sensor rail 6 Unplug the sensor connector on the left side of the rail and release one cable - HP Color LaserJet 8500 | Service Manual - Page 252
7 Pull the rail away from the chassis. 8 Remove two screws (callout 4). 42 Figure 102. Face-down output assembly 9 Lift the right side of the assembly, slide the assembly to the left, and lift it out of the chassis. 250 Chapter 6 - Removal and replacement EN - HP Color LaserJet 8500 | Service Manual - Page 253
of the printer: toner lock sensor color cartridge sensor subrelay PCA Toner lock sensor and color cartridge sensor 1 Remove the inside left panel (see page 230). 2 Remove one screw on the toner lock sensor (callout 1). 12 2 32 42 Figure 103. Toner lock sensor and color cartridge sensor - HP Color LaserJet 8500 | Service Manual - Page 254
Subrelay PCA 1 Remove the inside left panel (see page 230). 2 Remove the five connectors on the subrelay PCA (callout 1). 3 Remove four screws on the subrelay PCA (callout 2). 2 12 12 Figure 104. Subrelay PCA 252 Chapter 6 - Removal and replacement EN - HP Color LaserJet 8500 | Service Manual - Page 255
output accessory power cable from the printer. 3 Unplug the paper output accessory interface cable from the printer. 4 Holding the paper output accessory by the handle on the top and by the main body towards the bottom, pull the accessory away from the printer. 5 Push down on the end of the guide - HP Color LaserJet 8500 | Service Manual - Page 256
needs to be repaired or replaced, remove the hard drive and retain it to reattach to the formatter board later. 1 Print a configuration page if the printer is able to generate one (see page 415). Use this page to reset the NVRAM values that will be lost if the formatter board is - HP Color LaserJet 8500 | Service Manual - Page 257
before the formatter board was removed. • Serial number • Formatter number • Page counts (if the controller board is being replaced as well) • Transfer kit count (percentage of life remaining) • Fuser kit count (percentage of life remaining) • Engine settings The last two digits of the engine - HP Color LaserJet 8500 | Service Manual - Page 258
Internal printer hard disk (DN model) If the internal printer hard disk needs to be repaired or replaced, all data stored on the hard disk will be lost. Download fonts and other information as necessary. 1 Remove the formatter board from the printer (see page 254). 2 Unplug one connector (callout - HP Color LaserJet 8500 | Service Manual - Page 259
Feeder assembly The feeder assembly is located inside the left upper door. 1 Open the front door, and the left lower cover. 2 Remove the left rear cover (see page 234). 3 Remove the left upper cover (see page 236). 4 Remove six screws (callout 1). 12 Figure 108. Feeder assembly 5 Lift the feeder - HP Color LaserJet 8500 | Service Manual - Page 260
face-up output bin. 3 Remove the formatter board and formatter pan (see page 254 and page 272). 4 Remove one screw inside the back of the printer (callout 1). 32 12 Figure 109. Face-up solenoid (1 of 2) 258 Chapter 6 - Removal and replacement EN - HP Color LaserJet 8500 | Service Manual - Page 261
5 Lift the face-up solenoid up to release the tab and pull out to remove the solenoid (callout 2). 2 Figure 110. Face-up solenoid (2 of 2) Notes about reinstalling: Ensure that the plastic arm from the solenoid is engaged under the delivery drive swing arm (callout 3, figure 109). EN Left - HP Color LaserJet 8500 | Service Manual - Page 262
Face-up exit assembly The face-up exit assembly is located on the left lower cover. 1 Remove the left lower cover (see page 237). 2 Remove six screws (callout 1). 12 Figure 111. Screws on the face-up exit assembly 3 Remove the stopper hinges by popping the peg out of the door assembly. 4 Lift the - HP Color LaserJet 8500 | Service Manual - Page 263
Right assemblies Gain access to the following assemblies from the right side of the printer: tray 1 pick-up roller registration roller assembly paper photo sensors density sensor paper pick-up assembly tray 1 pick-up assembly Tray 1 Tray 1 is part of the right upper door. Take the - HP Color LaserJet 8500 | Service Manual - Page 264
pull to the left to remove the roller (callout 1). 12 2 Figure 113. Pick-up roller Note The figure above shows the inside of an HP Color LaserJet 8500 printer. The black plastic piece (callout 2) is eliminated on HP Color LaserJet 8550 printer models. 262 Chapter 6 - Removal and replacement EN - HP Color LaserJet 8500 | Service Manual - Page 265
assembly is located inside the right upper door under the transfer belt. 1 Open the front door and the right upper door. 2 Remove the transfer drum. 3 Remove the transfer belt. 4 Lift the paper diverter and remove two screws (callout 1). 12 Figure 114. Registration roller assembly (front) EN 263 - HP Color LaserJet 8500 | Service Manual - Page 266
5 Remove two screws on the back of the assembly (callout 2). Hint You might need to use a shorter screwdriver to get the back screws out. 2 Figure 115. Registration roller assembly (back) 264 Chapter 6 - Removal and replacement EN - HP Color LaserJet 8500 | Service Manual - Page 267
assembly 8 Remove one screw from the green knob on the front of the printer and remove the knob. 9 Pull the registration roller assembly out. Notes about mesh or you could cause scarring. Paper photo (OHT) sensors The paper photo sensors are located under the registration frame assembly and are used - HP Color LaserJet 8500 | Service Manual - Page 268
Density sensor The density sensor is located on the right upper door. 1 Open the right upper door. 2 With a flat screwdriver, release the six tabs on the sensor cover (callout 1). 2 12 Figure 117. Density sensor 3 Remove three screws from the sensor (callout 2). 4 Unplug one connector and remove - HP Color LaserJet 8500 | Service Manual - Page 269
Paper pick-up assembly The paper pick-up assembly is located inside the right upper cover assembly. 1 Remove trays 2 and 3. 2 Remove the right upper cover assembly (see page 238). 3 Remove the right lower cover assembly (see page 242). 4 Remove four screws, one in each corner of the paper pick-up - HP Color LaserJet 8500 | Service Manual - Page 270
Tray 1 pick-up assembly The tray 1 pick-up assembly is located on the right upper door. 1 Open the right upper door. 2 Remove the screw on the right side of the assembly (callout 1). . 2 12 Figure 119. Tray 1 pick-up assembly (1 of 2) 3 Remove the cover on the right side of the assembly (callout - HP Color LaserJet 8500 | Service Manual - Page 271
on the right side (callout 3). Two connectors are plugged into the controller board, and two connectors are inline connectors. It might be easier to disconnect the connectors from the rear of the printer and pull the wires through the printer frame than to unplug the connectors from the right upper - HP Color LaserJet 8500 | Service Manual - Page 272
62 122 123 Figure 121. Rear of printer with cover removed 1 Developer/imaging drum bias 5 Post charger high-voltage supply (shown in two parts, the (HV) module upper part is eliminated in all 6 Controller board HP Color LaserJet 8550 printer models) 7 Sheet metal cover plate 2 Main relay - HP Color LaserJet 8500 | Service Manual - Page 273
12 42 2 32 52 Figure 122. Rear of printer with formatter pan removed 1 Delivery drive assembly 2 Lower air duct 3 is behind the high-voltage power supply. The main gear assembly is behind the developer/imaging drum bias supply. The tray 2 and tray 3 media size sensing PCAs are located behind - HP Color LaserJet 8500 | Service Manual - Page 274
Formatter pan 1 Remove the rear cover (see page 243). 2 Remove the formatter board from the formatter pan (see page 254). 3 On the back of the printer, remove two screws on the top and three on the bottom of the pan (callout 1). 12 Figure 123. Formatter pan 272 Chapter 6 - Removal and replacement - HP Color LaserJet 8500 | Service Manual - Page 275
4 Remove five screws on the left side of the printer (callout 2). 2 Figure 124. Formatter pan (left side) 5 Pull the formatter pan off. EN Rear assemblies 273 - HP Color LaserJet 8500 | Service Manual - Page 276
Fan 1 Fan 1 is located on the middle right side of the rear of the printer. For information about removing the fan 1 housing, see page 283 (steps 4 through 6). 1 Remove the rear cover (see page 243). 2 Unplug the fan connector from the - HP Color LaserJet 8500 | Service Manual - Page 277
Fan 2 Fan 2 is located on the upper right side of the rear of the printer. For information about removing the fan 2 housing, see page 283 (steps 7 through 8). 1 Remove the rear cover (see page 243). 2 Unplug one connector (callout 1). 2 12 Figure - HP Color LaserJet 8500 | Service Manual - Page 278
is located on the lower right side of the rear of the printer. 1 Remove the rear cover (see page 243). 2 Remove the formatter board and formatter pan (see page 254 and page 272). 3 Unplug the five connectors. 4 Release one cable stay. 5 Remove five screws (two in the top, one on the left - HP Color LaserJet 8500 | Service Manual - Page 279
an HP Color LaserJet 8550 MFP printer and includes the ECO board cable (callout 1). Compare the controller board to the same part from an HP Color LaserJet 8500 printer, in figure 129 on page 278. 12 Figure 128. Controller board, HP Color LaserJet 8550 MFP printer Note Controller board removal - HP Color LaserJet 8500 | Service Manual - Page 280
the printer is able to generate one (see page 415). This page can be used to reset the page count values that will be lost if the controller board 5 Remove four screws (callout 1). 2 12 Figure 129. Controller board, HP Color LaserJet 8500 6 Push the white plastic holding tab in the upper left - HP Color LaserJet 8500 | Service Manual - Page 281
ECO board The ECO board is located on the lower left side of the rear of the printer, below the controller board, on HP Color LaserJet GN printer models. 1 Remove the rear cover (see page 243). 2 Remove the formatter board and formatter pan (see page 254 and page 272). 3 Unplug the ECO board - HP Color LaserJet 8500 | Service Manual - Page 282
Cartridge motor (M3) This motor is located to the left of fan 1. 1 Remove the rear cover (see page 243). 2 Unplug one connector (callout 1). 12 2 Figure 131. Cartridge motor 3 Remove four screws on the motor (callout 2), and pull the motor out. 280 Chapter 6 - Removal and replacement EN - HP Color LaserJet 8500 | Service Manual - Page 283
Main motor (M4) This motor is located to the right of the controller board, behind the formatter pan. 1 Remove the rear cover (see page 243). 2 Remove the formatter board and formatter pan (see page 254 and page 272). 3 - HP Color LaserJet 8500 | Service Manual - Page 284
Carousel motor PCA This PCA is located on the upper right side of the rear of the printer. 1 Remove the rear cover (see page 243). 2 Unplug six connectors. 3 Remove one screw (callout 1). 2 12 Figure 133. Carousel motor PCA 4 Release three tabs from the - HP Color LaserJet 8500 | Service Manual - Page 285
and lift it off. 5 Remove four screws from the fan 1 assembly (callout 1). 32 42 2 12 Figure 134. Fans 1 and 2 housing assemblies 6 Release two cable stays and unplug one connector on the right side of the assembly (callout 2) to remove the housing. 7 Remove one screw from the fan 2 assembly - HP Color LaserJet 8500 | Service Manual - Page 286
9 On the right side of the carousel motor, unplug one connector (callout 5). 62 52 Figure 135. Carousel motor 10 Remove four screws from the motor and lift it out (callout 6). 284 Chapter 6 - Removal and replacement EN - HP Color LaserJet 8500 | Service Manual - Page 287
Delivery drive assembly The delivery drive assembly is located behind the fan 1 housing and the formatter pan. 1 Remove the carousel motor PCA (see page 282). 2 Remove fan 1 housing (see page 283, steps 4 through 6). 3 Remove two screws (callout 1) from the lower air duct and remove the lower air - HP Color LaserJet 8500 | Service Manual - Page 288
4 Release three cable stays on the bottom of the delivery drive assembly. 5 Remove one screw (callout 3) and the gear cover. 42 52 32 Figure 137. Screws on the - HP Color LaserJet 8500 | Service Manual - Page 289
Open the left lower cover and remove the fuser. 2 Open the right upper door and remove the transfer drum. 3 Remove the registration roller assembly (see page 8 Remove tray 2 and tray 3 from the printer. 9 Remove the tray 2 rail from the front of the printer (one screw, two connectors). 10 Remove the - HP Color LaserJet 8500 | Service Manual - Page 290
are located on the midupper of the rear of the printer. Shown in figure 139 below are the assemblies in an HP Color LaserJet 8550 printer. Compare the developer/imaging drum bias supply to the same part from an HP Color LaserJet 8500 printer, in figure 140 on page 289, callouts 1 (the smaller - HP Color LaserJet 8500 | Service Manual - Page 291
from the sheet metal cover plate and lift it off. 3 Unplug four connectors (callout 3). 32 12 52 2 42 32 Figure 140. Developer/imaging drum bias supply 4 Release two cable stays. 5 Remove two screws on the bottom of the PCA housing (callout 4). 6 Remove one screw on the PCA (callout 5). 7 Lift the - HP Color LaserJet 8500 | Service Manual - Page 292
screw to release the wire from the open ended diode (callout 1, screw is hidden from view). 2 12 Figure 141. Post charger HV module 3 Release two cable stays. 4 Remove one screw on the top of the module (callout 2). 5 Lift the module up and out. 290 Chapter 6 - Removal and replacement EN - HP Color LaserJet 8500 | Service Manual - Page 293
on the upper left side when facing the rear of the printer. Removing high-voltage power supply 1 Remove the rear cover (see page 243). 2 Remove the formatter board and formatter pan (see page 254 and page 272). 3 Remove the controller board (see page 277). 4 Unplug six connectors from the PCA - HP Color LaserJet 8500 | Service Manual - Page 294
). 2 Remove the formatter board and formatter pan (see page 254 and page 272). 3 Unplug two connectors (callout 1). 2 12 Figure 143. Cleaning roller HV module 4 Release two cable stays. 5 Remove one screw from the top of the module (callout 2). 6 Pull the module out. 292 Chapter 6 - Removal and - HP Color LaserJet 8500 | Service Manual - Page 295
. 1 Remove the rear cover (see page 243). 2 Remove five screws from the sheet metal cover plate and lift it off. 3 Remove the developer/imaging drum bias supply (see page 291). 4 Unplug eight connectors (callout 1). 2 12 2 32 Figure 144. Main relay PCA 5 Remove two screws (callout 2). Note Take - HP Color LaserJet 8500 | Service Manual - Page 296
(see page 290). 2 Remove the cleaning roller HV module and the high-voltage power supply (see page 289). 3 Remove the fan 1 housing (see page 283, steps 4 through 6). 4 Release three cable stays. 5 Remove 12 screws (callout 1). 2 12 Figure 145. Drum/cartridge drive assembly 6 Lift the assembly up - HP Color LaserJet 8500 | Service Manual - Page 297
are located in the bottom right corner of the rear of the printer. Removing separation discharge high-voltage converter PCA 1 Remove the rear callout 1). 2 12 Figure 146. Separation discharge high-voltage converter 4 Release one cable stay. 5 Remove two screws (callout 2). 6 Lift the PCA up and off - HP Color LaserJet 8500 | Service Manual - Page 298
page 243). 2 Remove the formatter board and formatter pan (see page 254 and page 272). 3 Remove the power supply (see page 276). 4 Release one cable stay. 5 Remove one screw (callout 1) from the plate and remove the plate. 12 Figure 147. Plate over media size sensing PCAs 296 Chapter 6 - Removal - HP Color LaserJet 8500 | Service Manual - Page 299
6 Open the corresponding tray. 7 Remove three screws (callout 2) and unplug one connector on each PCA to remove. 12 Figure 148. Media size sensing PCAs Note The two PCAs and wire-sensing finger assemblies are interchangeable. EN Rear assemblies 297 - HP Color LaserJet 8500 | Service Manual - Page 300
You do not have to detach the 2,000-sheet input unit from the printer to service any of the units. The replaceable units are: front, back, left, and right covers VTU tray 4 paper pick-up assembly controller PCA front LED PCA assembly power supply main drive assembly paper size - HP Color LaserJet 8500 | Service Manual - Page 301
Front cover 1 Open tray 4 to the stops. 2 Remove the paper limit-back plate from the tray (callout 1). . 12 2 32 Figure 149. Front cover of the 2,000-sheet input unit 3 Remove four screws (callout 2). 4 Use a flat-blade screwdriver to release the plastic retaining tabs on the left- and right-front - HP Color LaserJet 8500 | Service Manual - Page 302
Back cover 1 Unplug the power cord and the C-link interface cables from the 2,000-sheet input unit. 2 Remove four screws (callout 1). 12 Figure 150. Back cover removal 3 Pull the cover back from the chassis. Notes about - HP Color LaserJet 8500 | Service Manual - Page 303
Left cover 1 Unplug the power cord and the C-link interface cables from the 2,000-sheet input unit. 2 Remove two screws (callout 1). 12 2 Figure 151. Left cover removal 3 Pull out on the top of the cover, and - HP Color LaserJet 8500 | Service Manual - Page 304
unit Remove the VTU to access the left side of the unit and the paper path mechanisms. 1 Unplug the power cord and the C-link interface cables from the 2,000-sheet input unit. 2 Open the VTU. 3 Rotate the two plastic safety catches on the VTU hinges towards the unit to the "open - HP Color LaserJet 8500 | Service Manual - Page 305
5 Remove two screws, one on the inner side of each safety catch. 6 Pull the door halfway closed, then lift the unit straight up to clear the metal locating tabs on the chassis. Notes about reinstalling: Before tightening the screws, ensure that the metal locating tabs are in place. WARNING! - HP Color LaserJet 8500 | Service Manual - Page 306
Right cover 1 Remove the VTU (see page 302). 2 Remove two screws near the middle of the right cover (callout 1). 2 12 Figure 153. Right cover with VTU removed 3 Using a flat-blade screwdriver, release the plastic retaining tab on the upper-left corner of the cover (callout 2). 4 Carefully pull - HP Color LaserJet 8500 | Service Manual - Page 307
page 301 and page 304). 4 Remove one screw and one metal retaining tab from each side of the chassis (callout 1). 12 Figure 154. Tray 4 removal 5 Support the rear of the tray while sliding it straight out of the chassis. EN 2,000-sheet input unit 305 - HP Color LaserJet 8500 | Service Manual - Page 308
Paper pick-up assembly The paper pick-up assembly is located on the right side of the unit. 1 Remove the VTU (see page 302). 2 Remove the right cover (see page 304). 3 Open tray 4 to the stops. 4 Unplug three connectors (callout 1). 2 12 Figure 155. Paper pick-up assembly 5 Remove five screws ( - HP Color LaserJet 8500 | Service Manual - Page 309
left covers (see page 300 and page 301). 2 Unplug 11 connectors (callout 1). 42 12 52 2 32 Figure 156. Controller PCA 3 Remove four hex screws from the two C-link cable connectors (callout 2). 4 Remove two screws from the right side of the PCA (callout 3). 5 Release the two plastic retaining - HP Color LaserJet 8500 | Service Manual - Page 310
Front LED PCA assembly 1 Open tray 4 halfway to the stops. 2 On the upper-left corner of the front of the chassis, remove one screw (callout 1). 12 Figure 157. Screw on front LED PCA assembly 3 Reach behind the LED PCA assembly and pull it away from the chassis. 4 Release three plastic retaining - HP Color LaserJet 8500 | Service Manual - Page 311
Power supply 1 Unplug the power cord and the C-link interface cables from the 2,000-sheet input unit. 2 Remove the back and left covers (see page 300 and page 301). 3 Unplug one connector (callout 1). 2 12 Figure 159. - HP Color LaserJet 8500 | Service Manual - Page 312
Main drive assembly 1 Remove the back cover (see page 300). 2 Unplug one connector from the controller PCA (callout 1). 12 2 Figure 160. Main drive assembly 3 Release two cable stays. 4 Remove one screw on top of the main drive assembly and one screw on the bottom (callout 2). 5 Pull the main - HP Color LaserJet 8500 | Service Manual - Page 313
-size sensor assemblies: the quantity switch assembly and the paper-size switch assembly. Removing the quantity switch assembly 1 Remove the back cover (see page 300). 2 Unplug one connector from the controller PCA (callout 1). 12 2 32 Figure 161. Paper quantity switch assembly 3 Release two cable - HP Color LaserJet 8500 | Service Manual - Page 314
Removing the paper-size switch assembly 1 Remove the back cover (see page 300). 2 Unplug one connector from the controller PCA (callout 1). 12 2 32 Figure 162. Paper size switch assembly 3 Remove one screw (callout 2) and the metal retaining spring (callout 3) that hold the assembly in - HP Color LaserJet 8500 | Service Manual - Page 315
Tension springs 1 Remove the left cover (see page 301). 2 Open tray 4 to the stops. 3 Inside the tray, remove one spring on the left runner and one spring on the right runner (callout 1). 12 Figure 163. Tension springs EN 2,000-sheet input tray 313 - HP Color LaserJet 8500 | Service Manual - Page 316
removed from the multibin mailbox: front, back, and top covers controller PCA power supply anti-curl strings paper bins and blind PCA transport belt motor user status LED PCA input paper guide attachment assembly metallic tape and housing assembly Hint Place the multi - HP Color LaserJet 8500 | Service Manual - Page 317
Front and back covers 1 Remove the multi-bin mailbox from the printer. 2 For each cover, use a small flat-blade screwdriver to release the three retaining tabs that secure the cover to the frame (callout 1). 12 12 Figure - HP Color LaserJet 8500 | Service Manual - Page 318
Top cover 1 Remove the front and back covers (see page 315). 2 Disconnect the cable from the LED PCA (callout 1, at the upper- front side of the frame). 2 12 32 Figure 165. Top cover 3 Remove one screw that secures the - HP Color LaserJet 8500 | Service Manual - Page 319
Power supply 1 Unplug one connector from the controller PCA (callout 1). 2 12 Figure 166. Power supply 2 Press the plastic retaining tabs on each side of the power supply to remove it (callout 2). EN Multi-bin mailbox 317 - HP Color LaserJet 8500 | Service Manual - Page 320
Paper bins and blind cover The procedure for removing the paper bins and the blind cover is the same. Each bin rests in its labeled slot. 1 Remove the face-up bin first. Lift the outer edge of the bin to clear the retaining notch in the frame, and then pull the bin away from the frame. 2 Remove the - HP Color LaserJet 8500 | Service Manual - Page 321
Flipper assembly 1 Remove all paper bins and the blind cover (see page 318). 2 Remove the front, back, and top covers (pages 315, 316). 3 Remove two screws closest to the upper-left side (callout 1). 12 32 12 Figure 168. Flipper assembly (1 of 3) 4 Hold down the jam access door and unplug the - HP Color LaserJet 8500 | Service Manual - Page 322
5 Unplug three connectors (figure 168, callout 3). 6 Use a flat-blade screwdriver to release the plastic retaining tab that secures the assembly to the top of the frame (callout our). 42 52 Figure 170. Flipper assembly (3 of 3) 7 Hold down the jam access door (callout 5) and pull the assembly out - HP Color LaserJet 8500 | Service Manual - Page 323
two screws from the motor (callout 2). 4 Pull the motor away from the frame. Notes about reinstalling: Position the motor in the frame so that the cable grommets are face down. EN Multi-bin mailbox 321 - HP Color LaserJet 8500 | Service Manual - Page 324
drive belt. 6 Gently pull out the motor. Notes about reinstalling: Reroute the cable on the transport belt motor behind the flat cable, and connect it to the J8 connector on the multi-bin mailbox controller PCA (callout 1). Replace the internal drive belt onto the transport belt motor gear - HP Color LaserJet 8500 | Service Manual - Page 325
Input paper guide 1 Remove the multi-bin mailbox from the printer. 2 Remove the face-up bin and the blind cover (see page 318). 3 Hold down the jam access door while unplugging the ground wire (callout 1). 12 Figure 173. Input paper guide (1 of 2) EN Multi-bin mailbox 323 - HP Color LaserJet 8500 | Service Manual - Page 326
4 Use a flat-blade screwdriver to release the retaining tabs on the top of the input paper guide (callout 2). 32 2 Figure 174. Input paper guide (2 of 2) 5 Pull the input paper guide free of the frame while routing the ground wire through the wire access hole (callout 3). 324 Chapter 6 - Removal - HP Color LaserJet 8500 | Service Manual - Page 327
Metallic tape and housing assembly 1 Remove all paper bins and the blind cover (see page 318). WARNING! The sharp edges of the metal tape can cause serious injury. When rewinding the metal tape into its housing, hold the tape securely and rewind it slowly. 2 With the delivery head assembly at the - HP Color LaserJet 8500 | Service Manual - Page 328
(callout 4), and then pull the end of the tape to the top of the multi-bin mailbox and reinsert it into place (callout 1). Use the guide pins to reinstall the tape housing (callout 3). When the housing is correctly positioned, it will click into place. 326 Chapter 6 - Removal and replacement EN - HP Color LaserJet 8500 | Service Manual - Page 329
callout 1). 2 12 32 32 Figure 177. Controller PCA (1 of 2) 2 Disconnect the C-link cable (callout 2). 3 Remove all paper bins and PCA cover (callout 3). 6 Remove two self-tapping screws and the grounding cable from the left side of the PCA cover (callout 4). 7 Open the cover to reveal - HP Color LaserJet 8500 | Service Manual - Page 330
8 Unplug eight connectors (callout 5) and remove the PCA. 52 Figure 178. Controller PCA (2 of 2) 328 Chapter 6 - Removal and replacement EN - HP Color LaserJet 8500 | Service Manual - Page 331
Anti-curl strings 1 Remove the back cover (see page 315). 2 Remove all the paper bins and the blind cover (see page 318). 3 On the lower-left side of the frame, remove two screws securing the tension springs (callout 1). 12 2 Figure 179. Anti-curl strings (1 of 2) 4 Remove the anti-curl strings - HP Color LaserJet 8500 | Service Manual - Page 332
6 Release the upper ends of the anti-curl strings from the jam access door by pushing the retaining tabs that secure the strings to the door (callout 3). 32 Figure 180. Anti-curl strings (2 of 2) 330 Chapter 6 - Removal and replacement EN - HP Color LaserJet 8500 | Service Manual - Page 333
Delivery head assembly 1 Remove the back cover (see page 315). 2 Remove all paper bins and the blind cover (see page 318). WARNING! The sharp edges of the metal tape can cause serious injury. When rewinding the metal tape into its housing, hold the tape securely and rewind it slowly. 3 With the - HP Color LaserJet 8500 | Service Manual - Page 334
5 Release the flat ribbon cable from the cable clip (callout 2), and gently disconnect the cable (callout 3). 2 32 Figure 182. Delivery head assembly (2 of 4) 6 Raise the assembly to the top of the frame. 7 Hold up the assembly and remove two screws ( - HP Color LaserJet 8500 | Service Manual - Page 335
8 Rotate the assembly clockwise while guiding the back end out of its access opening (see figure 184). 9 Release the anti-curl strings from the pulleys on each end of the assembly ( - HP Color LaserJet 8500 | Service Manual - Page 336
CAUTION Interlock switch 1 Remove the back cover (see page 315). Before removing the wires from the multi-bin mailbox interlock switch, note the location of each wire. Replacing the wires incorrectly can damage the interlock switch. 2 Disconnect two wires from the switch (callout 1). 2 12 Figure - HP Color LaserJet 8500 | Service Manual - Page 337
Diagnostic LED PCA 1 Remove the back cover (see page 315). 2 Unplug two connectors from the PCA (callout 1). 12 2 Figure 186. Diagnostic LED PCA 3 Remove one screw (callout 2). 4 Pull the PCA away from the frame. EN Multi-bin mailbox 335 - HP Color LaserJet 8500 | Service Manual - Page 338
User status LED PCA 1 Remove the front cover (see page 315). 2 Disconnect the cable from the PCA (callout 1). 12 2 Figure 187. User status LED PCA 3 Remove one screw (callout 2). 4 Pull the PCA away from the frame. 336 Chapter 6 - Removal and replacement EN - HP Color LaserJet 8500 | Service Manual - Page 339
Attachment assembly 1 Remove the controller PCA, but leave cables connected (see page 327). 2 Set the controller PCA on top of the unit (callout 1). 12 2 Figure 188. Attachment assembly 3 Remove the e-ring (callout 2). 4 Release the pivot pin that holds the attachment assembly - HP Color LaserJet 8500 | Service Manual - Page 340
flipper assembly carriage assembly1 accumulator assembly1 offset module2 stapler1 controller PCA LED PCA power supply interlock switch safety switch assembly attachment assembly flipper ribbon cable stationary and adjustable casters 1 3,000-sheet stapler/stacker only - HP Color LaserJet 8500 | Service Manual - Page 341
CAUTION Bins and covers Face-up bin 1 Lift slightly the end of the bin (callout 1). 2 Pull the bin away from the product (callout 2). When replacing the bin, make sure you position it under the bin-full flag (callout 3). Placing it over the bin-full flag and then attempting to force the bin into - HP Color LaserJet 8500 | Service Manual - Page 342
Back cover 1 Use the TX-20 screwdriver to remove three screws (callout 2). 2 Press and hold in the interlock switch (callout 3) while lifting the cover straight up until the cover is released from the product. 32 2 12 Figure 190. Front and back covers removal 340 Chapter 6 - Removal and replacement - HP Color LaserJet 8500 | Service Manual - Page 343
Foot cover 1 Remove the front and back covers. 2 Grasp the foot cover on one side, rotate it out slightly, and then lift it up to clear the locating pin. Repeat this step for the opposite side of the foot cover. 3 Lift up the cover and pull it away from the product. Figure 191. Foot cover removal - HP Color LaserJet 8500 | Service Manual - Page 344
. 3 Rotate the door down until the flat sides of the hinges are parallel to the floor and pull the door straight away from the product. Controller PCA cover (with label) 1 Use the TX-20 screwdriver to remove the upper and lower screws (callout 2) from the cover. 2 Rotate the cover to clear - HP Color LaserJet 8500 | Service Manual - Page 345
Flipper assembly 1 Remove the front and back covers. 2 At the back of the product, disconnect the flipper ribbon cable (callout 1) by pressing the black tabs on the connector to release the cable. 3 Use the TX-20 screwdriver to remove four screws (callout 2), two on each side of the assembly. 2 12 - HP Color LaserJet 8500 | Service Manual - Page 346
4 Use both hands to grasp the assembly on each side and, with a firm tug, lift the assembly straight up to clear the tabs (callout 1; one of the two tabs is shown) on each side of the assembly. 5 Pull the assembly straight away from the product, being careful of the bin-full flag. 12 Figure 194. - HP Color LaserJet 8500 | Service Manual - Page 347
the front cover, the back cover, and the controller PCA cover. 2 Disconnect the ribbon cable (callout 1) from the controller PCA by pressing the black tabs to release the cable. 12 Figure 195. Carriage assembly removal (1 of 2) 3 Push the ribbon cable up through the hole. EN 3,000-sheet stapler - HP Color LaserJet 8500 | Service Manual - Page 348
4 Use the TX-20 screwdriver to remove two screws (callout 1), one on each side of the assembly. 5 Lift the assembly to clear the tabs on each side of the assembly and pull the assembly straight away from the frame. 12 Figure 196. Carriage assembly removal (2 of 2) 346 Chapter 6 - Removal and - HP Color LaserJet 8500 | Service Manual - Page 349
assembly, HP strongly recommends that the carriage assembly be removed before removing the accumulator assembly. Otherwise, you might find it very difficult to reposition the accumulator assembly with the carriage assembly in the way. 2 Disconnect the ribbon cable (callout 1) from the controller PCA - HP Color LaserJet 8500 | Service Manual - Page 350
4 Use the TX-20 screwdriver to remove four screws (callout 1), two on each side of the assembly. 12 Figure 198. Accumulator assembly removal (2 of 2) 5 Lift the accumulator assembly up to clear the tabs at each side and rotate the top of the assembly down while pulling it away from the product. 348 - HP Color LaserJet 8500 | Service Manual - Page 351
(stacker only) 1 Remove the front cover, the back cover, the controller PCA cover, and the flipper assembly. 2 Disconnect the ribbon cable (callout 1) from the controller PCA by pressing the black tabs to release the cable. 3 Push the ribbon cable up through the hole. 4 Use the TX-20 screwdriver to - HP Color LaserJet 8500 | Service Manual - Page 352
assembly from the 3,000-Sheet stapler/ stacker and place it on a work surface. 2 Remove the staples cartridge from the stapler. 3 Disconnect the cable from its connector and unthread the cable from the cable guides. Figure 200. Stapler removal (1 of 3) 350 Chapter 6 - Removal and replacement EN - HP Color LaserJet 8500 | Service Manual - Page 353
Note 4 Use the TX-10 screwdriver to remove the grounding screw (callout 1) and release the grounding cable. 5 Use the TX-20 screwdriver to remove two screws and their washers (callout 2) from the stapler. Keep the washers with the screws to make sure - HP Color LaserJet 8500 | Service Manual - Page 354
Note 7 Lift the stapler away from the carriage. In the figure below, the stapler has been removed from the carriage assembly and is rotated to show the tabs (callout 1) and tab slots (callout 2). 2 12 Figure 202. Stapler removal (3 of 3) To reinstall Place the tabs in the tab holes and use firm - HP Color LaserJet 8500 | Service Manual - Page 355
to allow the holes on the controller PCA to clear the pins. 4 Pull the controller PCA from the product. See chapter 7, Troubleshooting, for information about the service LEDs (callout 3). Placing the controller PCA on a metal surface can damage the controller. Place the controller PCA on an ESD mat - HP Color LaserJet 8500 | Service Manual - Page 356
LED PCA 1 Remove the front cover. 2 Use the TX-10 screwdriver to remove one screw (callout 1) from the LED PCA. 3 Disconnect the cable (callout 2) to release the LED PCA. 12 2 Figure 204. LED PCA removal 354 Chapter 6 - Removal and replacement EN - HP Color LaserJet 8500 | Service Manual - Page 357
Power supply 1 Remove the controller PCA cover. 2 Unplug the power cable (callout 1) from the power supply. 3 Disconnect the cable from the controller PCA (callout 2). 4 Use the TX-20 screwdriver to remove one screw (callout 3) from the bracket that holds the power supply in place. 2 12 32 Figure - HP Color LaserJet 8500 | Service Manual - Page 358
Interlock switch 1 Remove the back cover. 2 Disconnect two cables (callout 1) from the interlock switch. 3 Squeeze the interlock switch on the top and bottom (callout 2), and slide the interlock through the hole (callout 3). 2 32 12 - HP Color LaserJet 8500 | Service Manual - Page 359
the sides of the safety switch assembly cover (callout 1) to release it from the frame and lift the cover away from the assembly. 3 Disconnect two cables (callout 2) from the safety switch assembly. 4 Press the tabs on the bottom of the safety switch assembly (one tab on each side-callout 3) to - HP Color LaserJet 8500 | Service Manual - Page 360
Attachment assembly (rod, bracket, cables) 1 Unplug the attachment assembly's C-link cable from the controller PCA and power cable from the power supply. 2 Use the TX-20 screwdriver to remove four screws (callout 1) from the attachment assembly. 3 Guide both cables through the hole and pull the - HP Color LaserJet 8500 | Service Manual - Page 361
back cover and the controller PCA cover. 2 Disconnect the cable (callout 1) at both ends by pressing the black tabs on the connectors. 3 Open the three cable clips (callout 2; two of the three cable clips are shown) to release the cable. 12 2 Figure 209. Flipper ribbon cable removal EN 3,000-sheet - HP Color LaserJet 8500 | Service Manual - Page 362
Stationary caster 1 Remove front or back cover, depending upon the caster you want to replace. 2 Lay the stapler/stacker on its front or back side so that the caster being replaced is off the floor. 3 Use the TX-20 screwdriver to remove one screw (callout 1) from the inside of the frame. 4 Rotate - HP Color LaserJet 8500 | Service Manual - Page 363
Adjustable caster 1 Remove the front cover, the back cover, and the foot cover. 2 Lay the stapler/stacker on its front or back side so that the caster being replaced is off the floor. 3 Use a flat blade screwdriver to snap the e-clip off of the adjusting knob (callout 1). 12 Figure 211. Adjustable - HP Color LaserJet 8500 | Service Manual - Page 364
362 Chapter 6 - Removal and replacement EN - HP Color LaserJet 8500 | Service Manual - Page 365
Disabling interlocks 425 Service mode formatter diagnostics 430 Cold reset 431 Fault log 432 Paper path troubleshooting 433 General paper path checklist 433 Wrinkled pages 433 Sealed envelopes 434 Media jams 434 Image formation troubleshooting 438 Understanding color variations 439 Common - HP Color LaserJet 8500 | Service Manual - Page 366
toner 454 Hot offset 455 Fading 455 Color balance adjustment 457 Repetitive defects troubleshooting 462 Color developer roller 464 Charging roller 464 Black developer roller 464 Cleaning roller 464 Developer DSD wheels 464 Transfer roller 465 Transfer drum 465 Fuser 467 Imaging drum - HP Color LaserJet 8500 | Service Manual - Page 367
479 3,000-sheet stapler/stacker troubleshooting 482 Calibrating the staple position 482 Troubleshooting tools 484 Printer messages 491 Communications troubleshooting 502 HP network interface support 502 Third-party network interface support 502 Diagrams 503 EN Chapter contents - HP Color LaserJet 8500 | Service Manual - Page 368
366 Chapter 7 - Troubleshooting EN - HP Color LaserJet 8500 | Service Manual - Page 369
print engine problem or a copy problem. Use the HP Color LaserJet 8550 MFP printer service manual to troubleshoot copy module and document feeder problems. l The printer driver is correct for the printer installed. l The printer is being powered off with the power button, not by the power cable, so - HP Color LaserJet 8500 | Service Manual - Page 370
Printer message troubleshooting Note This section contains explanations and recommended actions for messages that appear on the printer control panel. l Numbered table 42 on page 394. See CLEAR FUSER JAM LOWER LEFT DOOR in table 42 on page 390. See CLEAR FUSER JAM LOWER LEFT DOOR in table 42 on - HP Color LaserJet 8500 | Service Manual - Page 371
stays too long at paper entry sensor (PS31) 13.11.2B (event log message) Page stays too long at paper exit sensor (PS32) 13.11.31 (event log message) At power on, paper entry sensor (PS31) in VTU is active. See CLEAR INPUT DEVICE JAM in table 42 on page 391. EN Printer message troubleshooting 369 - HP Color LaserJet 8500 | Service Manual - Page 372
If this error occurs frequently or if large or complex print jobs are often sent to the printer, add more memory to the printer. The optimum amount of memory is 128 MB. 22 EIO BUFFER OVERFLOW Event log message current data in the print buffer will be lost. 370 Chapter 7 - Troubleshooting EN - HP Color LaserJet 8500 | Service Manual - Page 373
connector J2 on beam detect PCA, relay connector J40, and connector J211 on the controller board. 5 If the problem persists, replace the laser/ scanner unit. 6 If, after replacing the laser/scanner unit, the problem persists, replace the controller board. EN Printer message troubleshooting 371 - HP Color LaserJet 8500 | Service Manual - Page 374
in the printer driver or application = Media length specified in the printer driver or printer control panel is configured correctly. 3 Clean the detection windows of OHT sensors 1 and 2. 4 Reconnect connectors J1801 and J1802 of OHT sensors 1 and 2, connector J214 on the controller - HP Color LaserJet 8500 | Service Manual - Page 375
00.02 Description: Indicates that a warmup error has occurred in the fuser. Action: 1 Turn the printer off and on to reset the printer. 2 Verify the fuser is completely seated inside the printer. 3 Check for media jams in the fuser. 4 Replace the fuser kit. EN Printer message troubleshooting 373 - HP Color LaserJet 8500 | Service Manual - Page 376
Verify the fuser is completely seated inside the printer. 3 Reconnect connector J222 on the controller board, connector J26 on the fuser, and connector J101 on the power supply. 4 Replace the fuser kit. 5 Replace the power supply. 6 Replace the controller board. 374 Chapter 7 - Troubleshooting EN - HP Color LaserJet 8500 | Service Manual - Page 377
printer. 2 Reconnect connector J1001 on the laser driver PCA and connector J205 on the controller board. 3 Reconnect connector J2 on the beam detect PCA, relay connector J40, and connector J211 on the controller board. 4 If the problem (GND) on the controller board after the printer is turned on. If - HP Color LaserJet 8500 | Service Manual - Page 378
16 = More than one set of firmware upgrade DIMMs 17 = Not enough DRAM to run = EIO slot number: 1 = Bottom EIO slot 2 = Top EIO slot *The HP Color LaserJet 8550 printer supports font DIMMs; the HP Color LaserJet 8500 printer does not support font DIMMs. 376 Chapter 7 - Troubleshooting EN - HP Color LaserJet 8500 | Service Manual - Page 379
a toner cartridge shutter catching on the waste toner tray. Verify the toner lock lever is fully locked. If the message does not clear after closing the doors, turn the printer off and on to reset the printer. 3 Clean the carousel position sensor (PS3) with compressed air. If the problem persists - HP Color LaserJet 8500 | Service Manual - Page 380
: The process marks in the density sensing pattern are corrupted (see chapter 5 for more information). Action: 1 Press GO. 2 Print a configuration page and troubleshoot as an image-quality problem. 3 Check the transfer guide for cracks and replace the transfer guide as needed. 378 Chapter - HP Color LaserJet 8500 | Service Manual - Page 381
Event log message: 54.00.04 Description: The waste toner sensor has failed. Printing cannot continue. Action: 1 Replace the waste toner sensor assembly. 2 Replace the imaging drum. 54.00.05 (event log message) Sensor abnormality. See CLEAN DENSITY SENSOR CYCLE POWER in table 42 on page 389. 54 - HP Color LaserJet 8500 | Service Manual - Page 382
printer off and do not operate the printer in this condition or it can be seriously damaged. 1 Turn the printer off and on to reset it. 2 Reconnect connectors J702 and J706 on the carousel motor PCA, and connector J220 on the controller the printer is problem is not rectified after the printer - HP Color LaserJet 8500 | Service Manual - Page 383
problem is not rectified after the printer is turned off and on again, find the cause of activation of the overcurrent/overvoltage detection circuit in the power supply. Wait more than two minutes before turning the printer back on. 9 Replace the power supply. EN Printer message troubleshooting - HP Color LaserJet 8500 | Service Manual - Page 384
If the problem is not rectified after the printer is turned printer back on. 9 Replace the controller board. Event log message: 58.00.01 Action: 1 Open the right upper door and check for a media jam or misfed media. 2 Turn the printer off and on to reset the printer. 382 Chapter 7 - Troubleshooting - HP Color LaserJet 8500 | Service Manual - Page 385
power supply, and connector J227 on the controller board. 5 Check electrical continuity between printer off and on to reset the printer. 2 Perform DRAM DIMM test from the formatter diagnostics in the Service Menu. 3 If the problem persists, replace the bad DIMM. EN Printer message troubleshooting - HP Color LaserJet 8500 | Service Manual - Page 386
controller error. Action: 1 Turn the printer off and on to reset the printer. 2 Perform DRAM DIMM test from the formatter diagnostics in the Service Menu. 3 If the problem persists, replace the bad DIMM. 66.0. C-LINK COMM ERROR CHECK CABLES input unit. 384 Chapter 7 - Troubleshooting EN - HP Color LaserJet 8500 | Service Manual - Page 387
. 7 Replace the paper deck drive assembly. 8 Check that the paper tray raised sensor (PS34) is working properly (perform a sensor test). 9 Check for proper installation of the pick-up roller. 10 Check pick-up assembly cabling. 11 Replace the pick-up assembly. EN Printer message troubleshooting 385 - HP Color LaserJet 8500 | Service Manual - Page 388
. 2 Turn the printer off and on to reset the printer. 3 Replace the C-link cables. 4 Replace the multi-bin mailbox controller board PCA. Event log message: 67.00.0 Action: 1 Turn the printer off and on to reset the printer. 2 Replace the controller board. 386 Chapter 7 - Troubleshooting EN - HP Color LaserJet 8500 | Service Manual - Page 389
printer control panel cables and EIO cards. Turn the printer back on. Description 01 = IO ASIC register error 02 = Video ASIC register error 03 = IDE ASIC register error 2 Run extended formatter diagnostics from the Service Mode Menu to troubleshoot the failure. 3 If the problem - HP Color LaserJet 8500 | Service Manual - Page 390
administrator for access to the printer control panel. If it is necessary to override the password, perform a cold reset. See page 431 for information about performing a cold reset. CALIBRATING Event log message: None Description: The printer is adjusting the print density (see page 160 for more - HP Color LaserJet 8500 | Service Manual - Page 391
running the sensor monitor test from the Service Mode Menu, verify sensors that 8 and 9 on the printer control panel indicate 1 (on) when toggled. Note: This procedure will not work if the left lower cover interlock is not defeated. 4 Replace the duplexer. EN Printer message troubleshooting 389 - HP Color LaserJet 8500 | Service Manual - Page 392
: 1 = Time-out at paper entry sensor (PS31) B = Time-out at paper exit sensor (PS32 Review "Media requirements" in Chapter 1 of this manual. Check the control panel settings for media type. See the section about paper path tests under "Aids to Troubleshooting." Action: 1 Open the VTU and remove - HP Color LaserJet 8500 | Service Manual - Page 393
on, paper entry sensor (PS31) in VTU is active B = At power on, paper exit sensor (PS32) in VTU is active Action: 1 Open the VTU and remove any media. 2 Verify that PS31 and PS32 in the VTU move freely. 3 If either PS31 or PS32 are damaged, replace the VTU. EN Printer message troubleshooting 391 - HP Color LaserJet 8500 | Service Manual - Page 394
drum, and remove the jammed media from under the metal paper guide. Reinstall the transfer drum JAM Description: The printer senses a media jam sensor (PSFaceFull) flag moves freely. 3 Verify that the flipper shaft is in place. 4 Replace the flipper assembly. 5 Replace the multi-bin mailbox controller - HP Color LaserJet 8500 | Service Manual - Page 395
media, and close the left upper door. 2 Verify that PS30, PS10, PS11, and PS3 sensors and the surrounding area are clean. 3 Perform sensor monitor test in the Service Mode Menu to verify all paper path sensors are functioning properly or to locate the jam. EN Printer message troubleshooting 393 - HP Color LaserJet 8500 | Service Manual - Page 396
in the printer driver or application Load the media type and size indicated on the printer control panel. The and can be the default media type and size if an automatic paper override has occurred or if GO was pressed during a mount request. 394 Chapter 7 - Troubleshooting EN - HP Color LaserJet 8500 | Service Manual - Page 397
JOB is pressed, the printer finishes printing the buffered pages before returning online. DATA RECIEVED PRESS GO KEY Event log message: None Description: The printer has received and processed data. The printer is waiting for a formfeed. Action: Press GO. EN Printer message troubleshooting 395 - HP Color LaserJet 8500 | Service Manual - Page 398
LOW control panel setting. See table 20 on page 88 for information about the TONER LOW setting. Action: 1 Turn the printer off and on to reset the printer. 2 Reconnect connector J209, and relay connectors J47 and J48 on the controller board. 3 Replace the drum kit. 396 Chapter 7 - Troubleshooting - HP Color LaserJet 8500 | Service Manual - Page 399
toner cartridge in the imaging drum is full. Printing cannot continue until the drum kit has been replaced. Action: 1 Replace the drum kit. 2 Remove the drum cartridge from the printer, and clean the waste toner sensor window with a dry cloth. 3 Reconnect connector J221 on the controller board - HP Color LaserJet 8500 | Service Manual - Page 400
Otherwise printing will be halted. Action: Replace the fuser kit and reset the fuser counter by pressing SELECT before attempting to print (or use the RESETS menu on the printer control panel). See table 20 on page 88 for information about the TONER LOW setting. 398 Chapter 7 - Troubleshooting EN - HP Color LaserJet 8500 | Service Manual - Page 401
cartridge is installed correctly, check that the sensor PS1901C is functioning properly. 4 Clean the sensor with a toner wipe. 5 Reconnect connector J221 on the controller board, and connector J621 and relay connector J70 on the remaining color toner sensor. EN Printer message troubleshooting - HP Color LaserJet 8500 | Service Manual - Page 402
toner cartridge lever) on the printer. Move the lever to the left. Replace the lever if it is cracked. 11 Replace the black toner cartridge if it is deformed or damaged. 12 Replace the remaining color toner sensor. 13 Replace the controller board. Event log message: None Action: 1 Install the fuser - HP Color LaserJet 8500 | Service Manual - Page 403
it. Note: The imaging drum must be installed and the upper lever must be to the left in order for the carousel to rotate. 2 Turn the printer off and on to reset the printer. 3 Replace the drum cartridge. 4 Replace the drum cartridge if the drum cartridge on/off switch guide is deformed. 5 Make - HP Color LaserJet 8500 | Service Manual - Page 404
voltage is not approximately 24 V, replace the density sensor PCA. 6 Replace the controller board. LANGUAGE = Event log message: None Description: Displayed during start up. The printer has recognized the key sequence for changing the control panel language. Action: No action is required - HP Color LaserJet 8500 | Service Manual - Page 405
sure the cartridge is all the way in the printer. 3 Swing the blue toner lock lever on the carousel to the left until it clicks, and then close the clear and front doors. Event log message: None Description: Communication with the multi-bin mailbox has been lost. Action: 1 Verify all cables are - HP Color LaserJet 8500 | Service Manual - Page 406
manually fed. = Media type specified in the printer driver or application = Media size specified in the printer driver printer is compressing the print job so that all of the job will fit into the available printer printer memory. For more information about printer The printer is offline - HP Color LaserJet 8500 | Service Manual - Page 407
on the printer control panel through the Configuration Menu (see page 88). Action: Clear this message by pressing any key. Note: This message will also be cleared if a print job is sent to the printer or if an error condition is detected by the printer. EN Printer message troubleshooting 405 - HP Color LaserJet 8500 | Service Manual - Page 408
pressing SELECT, the value can be reset in the RESETS menu. 2 If the fuser has not been replaced, press GO. PRESS SELECT IF TRANSFER IS NEW Event log message: None Description: The printer has detected that a new transfer drum might have been installed. Note: This message will also occur if the - HP Color LaserJet 8500 | Service Manual - Page 409
and ready state. Action: No action is required. PRINTING EVENT LOG Event log message: None Description: The printer is printing the event log. When the event log is printed, the printer returns to an online and ready state. Action: No action is required. EN Printer message troubleshooting 407 - HP Color LaserJet 8500 | Service Manual - Page 410
processing a print job. PROCESSING JOB FROM TRAY Description: The printer is actively processing a print job. Event log message: None Action: No action is required. Event log message: None Action: No action is required. = Input tray (1, 2, 3, or 4). 408 Chapter 7 - Troubleshooting EN - HP Color LaserJet 8500 | Service Manual - Page 411
the ready state but remains offline. Action: Reset the EIO type and configure the printer before bringing the printer online. For more information on factory defaults and configuring the printer control panel, see page 82. SEPARATOR OUTPUT BIN FULL Event log message: None Description: The multi - HP Color LaserJet 8500 | Service Manual - Page 412
on page 88. TONER OUT REPLACE Event log message: None Description: The printer is out of the specified toner and cannot continue. = Cyan, magenta, yellow, or black Action: 1 Replace the toner cartridge specified. 2 Reconnect connector J226 on the controller board and connector - HP Color LaserJet 8500 | Service Manual - Page 413
to print (or use the RESETS menu on the printer control panel). TRANSFER KIT OUT REPLACE KIT Event log message: None Description: The transfer drum, transfer belt, cleaning roller, and charcoal filter are past their specified life. If TONER LOW is set to continue, printing can continue with - HP Color LaserJet 8500 | Service Manual - Page 414
itself online. If the correct media type and size are loaded in tray 1 and the media does not feed into the printer, verify that the printer control panel settings for tray 1 (Cassette mode) match the media type and size requested. TRAY 1 SIZE = Event log message: None Description: This - HP Color LaserJet 8500 | Service Manual - Page 415
input tray is loaded, the printer automatically goes online. Pressing GO causes the printer to attempt to print the page on the default type and size media. If the condition persists, check the input tray type and size configuration in the control panel. EN Printer message troubleshooting 413 - HP Color LaserJet 8500 | Service Manual - Page 416
(continued) TRAY NOT FUNCTIONAL Description: The installed tray is not supported by the printer. Event log message: None Action: Press GO to continue printing. message: None Description: The fuser is warming up. Action: No action is required. 414 Chapter 7 - Troubleshooting EN - HP Color LaserJet 8500 | Service Manual - Page 417
Aids to troubleshooting This section describes various tools service personnel can use to diagnose hardware problems. In addition to the tools described in this section, the service and support CD-ROM included with your service manual contains the user documentation. Use the additional information - HP Color LaserJet 8500 | Service Manual - Page 418
percentage of the maximum rated life remaining for the transfer kit, fuser kit, and drum kit. For HP Color LaserJet 8550 printer models (except for the MFP model), estimates of the amount of toner remaining in each of the four cartridges are also shown. 4 Memory-shows the total memory installed in - HP Color LaserJet 8500 | Service Manual - Page 419
1 3 6 4 2 5 7 8 Figure 212. Example of an HP Color LaserJet 8500 printer configuration page 1 3 6 4 2 5 7 9 8 10 Figure 213. Example of an HP Color LaserJet 8550 printer configuration page EN Aids to troubleshooting 417 - HP Color LaserJet 8500 | Service Manual - Page 420
a color image. If the image print quality is in question, a demonstration page should be printed to assure that the problem is not related to software, communications, or file quality. Printing a demonstration page 1 Press MENU until INFORMATION MENU appears on the printer control panel display - HP Color LaserJet 8500 | Service Manual - Page 421
Detailed service indications of failing parts or problem areas within the printer. See the printer control panel message descriptions beginning on page control panel display. 2 Press ITEM until PRINT EVENT LOG appears on the display. 3 Press SELECT to print the page. EN Aids to troubleshooting 419 - HP Color LaserJet 8500 | Service Manual - Page 422
voltages. CAUTION Entering the Service Mode Menu 1 From a READY state, press MENU until SERVICE MENU appears. 2 Press output bins. Removing some engine parts (such as the transfer drum) prevents paper from feeding completely. It is possible to select printer. 420 Chapter 7 - Troubleshooting EN - HP Color LaserJet 8500 | Service Manual - Page 423
cleaning roller press cam and solenoid (SL1), fuser, transfer belt, and output feed roller can be exercised during the paper path test. For safety reasons, the fuser, high-voltage supplies, and scanner are all turned off during testing. 1 From the Service JOB. The transfer drum can be removed with - HP Color LaserJet 8500 | Service Manual - Page 424
cartridge motor (M3) and carousel motor (M1) as they rotate during this test. To view the printer components, run the test with the right upper door open and the transfer drum imaging drum removed because the supply voltage to the carousel is cut off to avoid a pinch hazard. 1 From the Service Mode - HP Color LaserJet 8500 | Service Manual - Page 425
control panel. A single character in the upper line of the display provides a label for each sensor bit. A 0 (off) or 1(on) is displayed for each sensor bit, indicating whether the sensor is activated or deactivated. See table 43 for an explanation of the test results. EN Aids to troubleshooting - HP Color LaserJet 8500 | Service Manual - Page 426
during test. Duplex paper sensor (PS24) Paper sensor in the duplexer in the output position (HP Color LaserJet 8550 only) Reverse sensor (PS26) Paper sensor in the duplexer at the reversing position (HP Color LaserJet 8550 only) Bit 0 of temperature/humidity sensor B Bit 1 of temperature/humidity - HP Color LaserJet 8500 | Service Manual - Page 427
Disabling interlocks Figure 214. Right upper cover detection interlock Figure 215. Drum cartridge detection interlock EN Aids to troubleshooting 425 - HP Color LaserJet 8500 | Service Manual - Page 428
Figure 216. Black toner cartridge detection interlock Figure 217. Toner carousel door detection interlock 426 Chapter 7 - Troubleshooting EN - HP Color LaserJet 8500 | Service Manual - Page 429
Front cover Left lower door detection interlock Delivery cover Front cover detection interlock Left lower door detection interlock Front cover detection interlock Figure 218. Front cover/delivery cover detection interlocks EN Aids to troubleshooting 427 - HP Color LaserJet 8500 | Service Manual - Page 430
Laser shutters Laser shutter interlocks Figure 219. Laser shutters 428 Chapter 7 - Troubleshooting EN - HP Color LaserJet 8500 | Service Manual - Page 431
Figure 220. Left upper cover detection Figure 221. Right lower cover detection EN Aids to troubleshooting 429 - HP Color LaserJet 8500 | Service Manual - Page 432
printer control panel: • ROM CRC - The read-only memory cyclic redundancy check reads the values stored in the firmware following: a instructs the disk drive printer control panel display. 7 Press SELECT. Turn the printer off and on to exit the formatter diagnostics. 430 Chapter 7 - Troubleshooting - HP Color LaserJet 8500 | Service Manual - Page 433
control panel keys are ignored. A cold reset changes all user-accessible printer variables stored in NVRAM to their factory defaults except for the following items: • page counts • fuser life count • transfer life count • multi-bin mailbox mode • display language Color Aids to troubleshooting 431 - HP Color LaserJet 8500 | Service Manual - Page 434
formatter diagnostics to record error messages. This log provides service personnel with an account of all errors that occurred message is discarded. The contents of the fault log are erased when the printer is powered off or when the fault log is cleared. Viewing the fault - Troubleshooting EN - HP Color LaserJet 8500 | Service Manual - Page 435
pages Verify the green fuser lever is down. Verify the media size and type are set correctly in the printer driver and the printer control panel. Verify the media meets the specifications listed in the HP LaserJet Printer Family Paper Specification Guide. EN Paper path troubleshooting 433 - HP Color LaserJet 8500 | Service Manual - Page 436
size in the printer driver as a custom size. However, setting envelopes as a custom size can cause poor fusing. Media jams When troubleshooting media jams, remember that jams are posted as a result of timing errors. That is, media fails to arrive at, or fails to clear, the paper path sensor in the - HP Color LaserJet 8500 | Service Manual - Page 437
Figure 222. Printer paper path For information about printer and paper handling accessory sensors, see chapter 5. EN Paper path troubleshooting 435 - HP Color LaserJet 8500 | Service Manual - Page 438
media) 12.7 seconds (high-gloss mode/11-by-17 inch-sized media) The fusing delivery sensor (PS1903) does not detect the media for the specified time or longer within 0.2 to 1.2 seconds ) 3.2 seconds (overhead transparency mode) 2.4 seconds (high-gloss mode) 436 Chapter 7 - Troubleshooting EN - HP Color LaserJet 8500 | Service Manual - Page 439
inch-sized media) 12.7 seconds (high-gloss mode/11-by-17 inch-sized media) Wrong media size feed jam The controller board detects media size with the registration roller paper sensor (PS1), and it stops the engine if the media size differs more than 15 mm between the specified media size and - HP Color LaserJet 8500 | Service Manual - Page 440
image formation troubleshooting: 1 Verify the media type is set correctly in the printer control panel, and that the media type selected in the printer driver matches the media being printed on. 2 Verify that the media meets the specifications listed in the HP LaserJet Printer and process color. For - HP Color LaserJet 8500 | Service Manual - Page 441
. Environmental changes can cause color variation. The development process places a high potential across an air gap to attract toner to the imaging drum. Changes in relative humidity vary the point at which the toner travels to the imaging drum. The EN Image formation troubleshooting 439 - HP Color LaserJet 8500 | Service Manual - Page 442
convert or modify some characteristics of the color before sending the information to the printer driver. The printer driver might also modify color characteristics depending upon the selected output mode. Any color characteristics not addressed by the printer driver or applications are set to the - HP Color LaserJet 8500 | Service Manual - Page 443
Image defects troubleshooting Image orientation Unless otherwise specified, all references in this section to horizontal or vertical directions of print-quality problems refer to problems found on letter- and A4-sized media. These media sizes are fed into the printer long edge first. Because media - HP Color LaserJet 8500 | Service Manual - Page 444
occurs on pages Note PostScript print samples are located on the service and support CD (which is included with your service manual). Print these files by copying them to the parallel port (LPT 1), for example: copy magnta.ps lpt1 Image defect examples Figures 225 through 232 show examples of - HP Color LaserJet 8500 | Service Manual - Page 445
é Leading edge é Figure 224. Color-plane registration See page 452 for a resolution to this print defect. EN Image defects troubleshooting 443 - HP Color LaserJet 8500 | Service Manual - Page 446
é Leading edge é é Developer streak Figure 225. Developer streak See page 453 for a resolution to this print defect. 444 Chapter 7 - Troubleshooting EN - HP Color LaserJet 8500 | Service Manual - Page 447
é Leading edge é Figure 226. Rain See page 453 for a resolution to this print defect. EN Image defects troubleshooting 445 - HP Color LaserJet 8500 | Service Manual - Page 448
é Leading edge é Figure 227. Toner bubbles See page 453 for a resolution to this print defect. 446 Chapter 7 - Troubleshooting EN - HP Color LaserJet 8500 | Service Manual - Page 449
é Leading edge é é 44 mm intervals é 44 mm intervals é Figure 228. Charge roller set See page 454 for a resolution to this print defect. EN Image defects troubleshooting 447 - HP Color LaserJet 8500 | Service Manual - Page 450
é Leading edge é Figure 229. Waves See page 454 for a resolution to this print defect. 448 Chapter 7 - Troubleshooting EN - HP Color LaserJet 8500 | Service Manual - Page 451
é Leading edge é Figure 230. Missing toner See page 454 for a resolution to this print defect. EN Image defects troubleshooting 449 - HP Color LaserJet 8500 | Service Manual - Page 452
é Leading edge é Figure 231. Hot offset (glossy paper or transparency) See page 455 for a resolution to this print defect. 450 Chapter 7 - Troubleshooting EN - HP Color LaserJet 8500 | Service Manual - Page 453
é Leading edge é Figure 232. Fading resulting from broken transfer guide See page 455 for a resolution to this print defect. EN Image defects troubleshooting 451 - HP Color LaserJet 8500 | Service Manual - Page 454
troubleshooting list below to resolve poor color-plane registration. If the problem still exists after you complete step 1, try step 2. If step 2 fails to solve the problem, try step 3, and so on. 1 Check manufacturing codes on toner cartridges if the problem appears after replacing a color toner - HP Color LaserJet 8500 | Service Manual - Page 455
by color toner leaking from cartridges directly onto the transfer drum. Solve the problem of toner bubbles by checking the manufacturing codes on the toner cartridges (see "Toner cartridge manufacturing codes" on page 456) and replacing cartridges as needed. EN Image defects troubleshooting 453 - HP Color LaserJet 8500 | Service Manual - Page 456
usually appears immediately after installing a new imaging drum or if the printer has been in storage without power applied for a prolonged period of time. The conductive rubber charge roller inside the imaging drum cartridge can flatten on one side when the drum sits idle. A charge roller typically - HP Color LaserJet 8500 | Service Manual - Page 457
is characterized by blotches of toner on printed transparencies. Avoid the print defect by using only thicker transparencies specifically designed for HP Color LaserJet printers. Fading (See figure 232 on page 451 for an example of this print defect.) A broken transfer drum guide (see figure 260 on - HP Color LaserJet 8500 | Service Manual - Page 458
code. If a portion of the code does not match the list below, replace the toner cartridge. Use toner cartridges that contain any of the following manufacturing codes: 9I 9J 9K 9L any cartridge that begins with the numbers 0 through 6 in place of the 9 456 Chapter 7 - Troubleshooting EN - HP Color LaserJet 8500 | Service Manual - Page 459
with the printer driver and application settings to adjust the color output. For more information about application settings, see the online help. Clean the density sensor (see page 114). Complete the troubleshooting solutions earlier in this chapter for the color printing problem you are - HP Color LaserJet 8500 | Service Manual - Page 460
B A C D Figure 233. Color adjust page A Smooth Half-tone Adjust section B Color ramps C Detail Half-tone Adjust section D Neutral axis 458 Chapter 7 - Troubleshooting EN - HP Color LaserJet 8500 | Service Manual - Page 461
Press GO and - VALUE + at the same time. COLOR ADJUST MENU appears on the printer control panel display. b Press ITEM until PRINT TEST PAGE appears on the display. c Press SELECT to print the color adjust page. d Press GO to exit the Color Adjust Menu. The color adjust page allows you to adjust the - HP Color LaserJet 8500 | Service Manual - Page 462
number into the printer memory. An asterisk (*) appears to the right printer control panel to the number shown in that circle. • Verify that the circles in the neutral axis areas of the color adjust test page are neutral gray (gray without a color is an overall tint of color in the circles, make the - HP Color LaserJet 8500 | Service Manual - Page 463
background, the magenta ramp should be examined closely to determine if magenta should be increased. If the color settings are less accurate when you finish the color adjustment than when you started, reset all color values to 0 (zero) in the printer control panel and try the adjustment again. EN - HP Color LaserJet 8500 | Service Manual - Page 464
roller (at 56 mm) developer DSD wheels (at 65 mm) transfer roller (at 66 mm) transfer drum (occurs once per 11-by-17 inch or A3-sized page, or every other letter- or A4-sized page) fuser (at 150.5 mm) imaging drum (at 195 mm) transfer belt (at 222 mm) 462 Chapter 7 - Troubleshooting EN - HP Color LaserJet 8500 | Service Manual - Page 465
print defect Color developer roller, 38 mm Charging roller, 44 mm Black developer roller, 52 mm Cleaning roller, 56 mm Developer DSD wheels 65 mm Transfer roller, 66 mm Transfer drum, once per 11-by-17 inch or A3-sized page or every other letteror A4-sized page Fuser, 150.5 mm Imaging drum, 195 mm - HP Color LaserJet 8500 | Service Manual - Page 466
Cause: Dirty or damaged charging roller. Actions: Replace the imaging drum. Black developer roller Symptoms: Print defect occurring every 38 mm. Cause: Dirty or damaged developer roller. Actions: Replace the toner cartridge. Cleaning roller Symptoms: Print defects occurring every 56 mm. Cause: Dirty - HP Color LaserJet 8500 | Service Manual - Page 467
on which to work a hand wipe You can also use a dry, clean, soft, lint-free cloth, such as cheesecloth, to clean the transfer drum. To prevent scratches on the drum, do not use any paper products (such as tissue or paper towels) to clean the drum. EN Repetitive defects troubleshooting 465 - HP Color LaserJet 8500 | Service Manual - Page 468
the transfer drum. 7 Swing the lower lever to the left making sure it clicks into place. 8 Close the right upper and front doors, and turn the printer on. 9 Reprint the print job. If cleaning does not eliminate the repetitive defect, replace the transfer drum. 466 Chapter 7 - Troubleshooting EN - HP Color LaserJet 8500 | Service Manual - Page 469
the imaging drum. Defects caused by exposure to light might clear up over time. If severe, replace the imaging drum. Do not expose the imaging drum to direct sunlight, and be careful not to scratch or get fingerprints on the drum surface during cleaning. EN Repetitive defects troubleshooting 467 - HP Color LaserJet 8500 | Service Manual - Page 470
Transfer belt Symptoms: Print defects occurring every 222 mm. Cause: Defects on the transfer belt surface. Actions: Remove the transfer belt and inspect the entire belt surface. Use the transfer belt gears to rotate the belt through its travel. 468 Chapter 7 - Troubleshooting EN - HP Color LaserJet 8500 | Service Manual - Page 471
C-link cable that connects the unit and the printer Begin troubleshooting 1 Print or display the error log. Evaluate the error log for any specific error trends in the last 10,000 printed pages. 2 Print a configuration page to verify the proper installation of the paper-handling accessories. • If - HP Color LaserJet 8500 | Service Manual - Page 472
amber The unit is experiencing a hardware malfunction. Isolate the problem using one of the other procedures described in this section. printer might be in Power Press GO. Save mode. The unit is not receiving power. Check the power supply and the power cables. 470 Chapter 7 - Troubleshooting EN - HP Color LaserJet 8500 | Service Manual - Page 473
Figure 236. Rear view of 2,000-sheet input unit 1 Service LEDs 2 DIP switches 3 Power supply Note Be sure to turn the 2,000-sheet input unit to operational mode. Reset the DIP switches on the controller PCA, and then switch the power supply back to diagnostic mode to enable the new diagnostic test. - HP Color LaserJet 8500 | Service Manual - Page 474
service problem, replace tray 4. 2 1 Registration sensor The media does not reach the sensor sensors and replace the jam corresponding field replaceable unit. 2 3 Jam sensor delay The media did not reach the sensor Jam sensor Open sensors. 1 3 No paper in tray 4 Load paper or check sensors - HP Color LaserJet 8500 | Service Manual - Page 475
472 for an interpretation of the service LED patterns.) 4 To stop the test, turn the power supply switch back to operational mode and set the DIP switches on the controller PCA to the off position. Open the VTU and remove any media from the paper path. EN 2,000-sheet input unit troubleshooting 473 - HP Color LaserJet 8500 | Service Manual - Page 476
and the vertical transfer unit (VTU). 3 Set the DIP switches on the 2,000-sheet input unit's controller PCA for the motor test. (See page 473 for an explanation of the settings.) 4 Use the switch reset the DIP switches on the controller PCA to the off position. 474 Chapter 7 - Troubleshooting EN - HP Color LaserJet 8500 | Service Manual - Page 477
closed sensor (PS35) 4 Paper tray raised sensor (PS34) 5 Paper tray empty sensor (PS33) To perform the test 1 Set the DIP switches on the 2,000-sheet input unit's controller PCA for the sensor test. (See page 473 for an explanation of the settings.) EN 2,000-sheet input unit troubleshooting 475 - HP Color LaserJet 8500 | Service Manual - Page 478
to switch to diagnostic mode. 4 Manually activate the sensor. • When you activate the sensor, the bottom service LED on the controller PCA comes on. When you release the sensor, the LED goes off. • If the LED does not come on, there is a problem with the sensor. Replace the corresponding field - HP Color LaserJet 8500 | Service Manual - Page 479
Note The multi-bin mailbox standalone diagnostic tool is a troubleshooting aid that verifies how the multi-bin mailbox functions alone. The tests are designed to be used without C-link commands from the EPH controller on the printer. Switching the multi-bin mailbox to test mode 1 Turn - HP Color LaserJet 8500 | Service Manual - Page 480
If the service LEDs are blinking in a pattern, indicating an error code, a problem exists (table 49 on page 479 lists the error codes indicated by the blinking pattern). Paper path test Use only supported media types for the paper path test. 1 Manually feed paper through the input paper guide. • The - HP Color LaserJet 8500 | Service Manual - Page 481
information about the power-on status and about the attachment to and alignment of the accessory with the printer. The three service LEDs are near the center of the multi-bin mailbox back cover. The service LEDs blink independently of each other, indicating the status of the multi-bin mailbox. LED - HP Color LaserJet 8500 | Service Manual - Page 482
connections. Replace flipper assembly. Replace the multi-bin mailbox controller PCA. Remove media from the face-up bin. Check for jammed sensor flag. Replace the flipper assembly. Check for proper cable connection. Open jam access door and check for media jam or out-of-place flipper - HP Color LaserJet 8500 | Service Manual - Page 483
Replace the multi-bin mailbox controller PCA. Jam in delivery head assembly Time-out condition in the PSExit1 sensor. Check for media jam the flat ribbon cable that connects to the delivery head assembly. Replace the delivery head assembly. Replace the multi-bin mailbox controller PCA. - HP Color LaserJet 8500 | Service Manual - Page 484
powers on, the NVRAM receives the calibration values. 3 After successful power on, exit service mode (see "To exit service mode" later in this chapter). 4 Turn the printer on and wait until Ready appears on the control panel display. The user LED, located at the top of the front cover, should blink - HP Color LaserJet 8500 | Service Manual - Page 485
Press SELECT. 22 Press GO. If you set compensation values, the printer should return to Ready automatically and the user LED should return to the solid . Because you set calibration values, the printer should not allow access to the compensation values in service mode. If you did not set compensation - HP Color LaserJet 8500 | Service Manual - Page 486
Note Troubleshooting tools Paper path test Using the information from the event log, you can verify a specific printer paper path with the paper path test. The paper path test then press SELECT. To stop the paper path test, press CANCEL JOB on the control panel. 484 Chapter 7 - Troubleshooting EN - HP Color LaserJet 8500 | Service Manual - Page 487
between two events. The figure shows the flow of a normal sheet, from entry to the accumulator/offset module. Figure 240. Device timing The printer sends a delivery notice for each sheet. When the device detects the signal, a timeout of three seconds begins. EN 3,000-sheet stapler/stacker - HP Color LaserJet 8500 | Service Manual - Page 488
, a timeout of 1.5 seconds begins for activation of the registration wheel's sensor. GWSens sensor/Exit sensor If the GWSens sensor (in the stapler/stacker) or the Exit sensor (on the stacker) is not activated within the timeout, the device declares a jam 12. 486 Chapter 7 - Troubleshooting EN - HP Color LaserJet 8500 | Service Manual - Page 489
printer. The device has a user LED and a set of service LEDs service mode 1 Release the interlock switch and slide the service mode switch on the controller PCA back to the normal position. 2 Reinstall the controller PCA cover and C-link and power cables. 3,000-sheet stapler/stacker troubleshooting - HP Color LaserJet 8500 | Service Manual - Page 490
LED blinks green when the printer is turned on after setting and exiting service mode. Perform steps 18 to reset the device. Any stapler settings or offset settings configured at the printer control panel are ignored during the stapler test/stacker test. 1 Feed two sheets of 7 - Troubleshooting EN - HP Color LaserJet 8500 | Service Manual - Page 491
. The user LED should blink amber within a few seconds. Stacker Bin Full Sensor Test Block the upper optical sensor until the stacker bin reaches the bottom of its motion, triggering the stacker bin full sensor; the user LED should blink amber. EN 3,000-sheet stapler/stacker troubleshooting 489 - HP Color LaserJet 8500 | Service Manual - Page 492
Blinking Printer in powersave mode or device not receiving power Device is on and ready Device is in service mode Device has a hardware malfunction Device is not correctly attached to printer, one or more bins are full, or device has a paper jam or a staple jam 490 Chapter 7 - Troubleshooting EN - HP Color LaserJet 8500 | Service Manual - Page 493
locate the error message in the tables. The printer has enhanced information in the control panel. Printer messages shown on the control panel display provide five categories of information. Each message /output device hardware malfunction EN 3,000-sheet stapler/stacker troubleshooting 491 - HP Color LaserJet 8500 | Service Manual - Page 494
the control panel and event log messages: x is the C-link device number in the daisy chain: 0 Paper handling controller 1 First C-link device 2 Second C-link device 3 Third C-link device 4 Fourth C-link device 5 Fifth C-link device y is the C-link device type: 0 Paper handling controller 1 Input - HP Color LaserJet 8500 | Service Manual - Page 495
error message tables later in this chapter for recommended actions. Control panel message Event log 13.11 Paper Jam in Input 13.11 error code 1B. This is normally a timeout at an entry or exit sensor. A hardware malfunction occurred in the second C-link device configured. It is troubleshooting 493 - HP Color LaserJet 8500 | Service Manual - Page 496
HP 3,000-sheet stapler/stacker error messages Operating errors Table 52. Operating errors in the stapler/stacker Event Control panel log error User messages message LED Service ) Stapler out N/A N/A N/A The cartridge is out Refill the stapler. of guide. 494 Chapter 7 - Troubleshooting EN - HP Color LaserJet 8500 | Service Manual - Page 497
Open Doors Table 53. Open doors in the stapler/stacker Event Control panel log error User messages message LED Service LED Description Recommended action Stkr: Attach N/A to printer Stkr: Close N/A stapler door Blinking amber Blinking amber Blinking green Blinking green The device is - HP Color LaserJet 8500 | Service Manual - Page 498
, if necessary. If the problem persists, replace the flipper assembly. Media jammed at Clear the jam. flipper entry sensor. Power cycle the printer and the computer, if necessary. If the problem persists, replace the flipper assembly. 496 Chapter 7 - Troubleshooting EN - HP Color LaserJet 8500 | Service Manual - Page 499
Event Control panel log error User messages message LED Stkr: Detach 13.13 04 Blinking and Clear Jam or amber (continued) 13.23 04 13.13 05 Blinking or amber 13.23 05 13.13 06 Blinking or amber 13.23 06 13.13 09 Blinking or amber 13.23 09 Service LED - HP Color LaserJet 8500 | Service Manual - Page 500
Event Control panel log error User messages message LED Stkr: Detach 13.13 0A Blinking and Clear Jam or amber (continued) 13.23 0A 13.13 0B Blinking or amber 13.23 0B 13.13 11 Blinking or amber 13.23 11 13.13 12 Blinking or amber 13.23 12 Service LED - HP Color LaserJet 8500 | Service Manual - Page 501
cycle the printer and the computer. Verify unit calibration (Y compensation). Replace the stapler assembly. Hardware malfunctions Table 55. Hardware malfunctions in the stapler/stacker Event Control panel log error User messages message LED Stkr: Call 66.13.17 Solid Service or amber - HP Color LaserJet 8500 | Service Manual - Page 502
the computer. If the problem persists, replace the controller PCA. Blinking The controller PCA red is damaged. (six blinks) -Or- There is an EEPROM error. Power cycle the printer and the computer. If the problem persists, replace the controller PCA. 500 Chapter 7 - Troubleshooting EN - HP Color LaserJet 8500 | Service Manual - Page 503
66.23.37 Error 06 66.13.37 or 66.23.37 Output device failure Service Recommended LED Description action Blinking The controller PCA Power cycle the red is damaged. printer and the (six blinks) computer. -Or- If the problem persists, ROM has been corrupted. replace the - HP Color LaserJet 8500 | Service Manual - Page 504
Communications troubleshooting CAUTION HP network interface support Unless you have experience with the particular network under repair, seek the help of a qualified network professional before changing any network configuration settings. If the printer is configured with an HP network interface - HP Color LaserJet 8500 | Service Manual - Page 505
Diagrams This section contains general circuit (wiring) diagrams. Figure 242. Connectors on the controller board EN Diagrams 503 - HP Color LaserJet 8500 | Service Manual - Page 506
Developer/ imaging drum bias supply High-voltage power supply Figure 243. General printer circuit diagram (1 of 4) 504 Chapter 7 - Troubleshooting EN - HP Color LaserJet 8500 | Service Manual - Page 507
Figure 244. General printer circuit diagram (2 of 4) EN Diagrams 505 - HP Color LaserJet 8500 | Service Manual - Page 508
Figure 245. General printer circuit diagram (3 of 4) 506 Chapter 7 - Troubleshooting EN - HP Color LaserJet 8500 | Service Manual - Page 509
Figure 246. General printer circuit diagram (4 of 4) EN Diagrams 507 - HP Color LaserJet 8500 | Service Manual - Page 510
508 Chapter 7 - Troubleshooting EN - HP Color LaserJet 8500 | Service Manual - Page 511
accessories 511 Miscellaneous parts 514 Illustrations and parts lists 516 Major assembly locations 517 Printer covers and doors 519 Internal cover assembly 526 Internal components 528 Drum/cartridge Transfer belt assembly 555 Fuser assembly 556 PCA assemblies 559 EN Chapter contents 509 - HP Color LaserJet 8500 | Service Manual - Page 512
2,000-sheet input unit components 560 Multi-bin mailbox components 564 3,000-sheet stapler/stacker components 570 Numerical parts list 574 Alphabetical parts list 587 510 Chapter 8 - Parts and diagrams EN - HP Color LaserJet 8500 | Service Manual - Page 513
printer model. Ordering parts Note Note All standard part numbers are stocked and can be ordered from Support Materials Organization (SMO) or Support ordered. Consumables, options, and accessories The items listed in table 56 are available through your local authorized HP dealer. To find a dealer - HP Color LaserJet 8500 | Service Manual - Page 514
mailbox (product number C4785A) NOTE: You must have a 2,000-sheet input unit in order to install a multibin mailbox. Paper handling accessories C4785-69519 Exchange multi-bin mailbox C4788A 3,000-sheet stapler/stacker C4779A 3,000-sheet stacker C7837A Automatic document feeder C7839A 1,000 - HP Color LaserJet 8500 | Service Manual - Page 515
Black toner cartridge C4150A Cyan toner cartridge C4151A Magenta toner cartridge C4152A Yellow toner cartridge C4153A Drum kit Imaging drum Two air filters Hand wipe C4154A Transfer kit Transfer drum Transfer belt Cleaning roller Charcoal filter Hand wipe C4155A 110-volt fuser kit Fuser - HP Color LaserJet 8500 | Service Manual - Page 516
5021-8956 HP LaserJet Printer Family Paper Specification Guide 5021-0337 PCL/PJL Technical Reference Package 5091-6456 HP Peripherals Connectivity Solutions Guide 5966-5171 HP JetDirect Software Installation Guide (English) C3989-60115 HP Color LaserJet 8500, 8500N, 8500 DN Service and Support CD - HP Color LaserJet 8500 | Service Manual - Page 517
, Czech, 8500 models C3983-67905 Formatter assembly C4781-60500 Power box C4785-60513 Multi-bin mailbox, repackaging kit C4785-60531 Multi-bin mailbox, short C-link cable adapter C4787-60503 Multi-bin mailbox, shipping lock kit C7096-40001 Control panel overlay, Turkish, 8550 models - HP Color LaserJet 8500 | Service Manual - Page 518
8500 printers to HP Color LaserJet 8550 printers. These parts are forward and backward compatible. Formatters, however, are not interchangeable between models of printers. Part HP CLJ 8500 part # HP CLJ 8550 part # PCA, controller board RG5-3037-000CN RG5-3037-120CN Developer/imaging drum - HP Color LaserJet 8500 | Service Manual - Page 519
Major assembly locations Delivery assembly Left cover feeder assembly Black cartridge cam assembly Black cartridge guide assembly Delivery drive assembly Paper pick-up assembly Transfer belt assembly Registration roller assembly Tray 1 pick-up assembly Registration frame assembly Tray 1 - HP Color LaserJet 8500 | Service Manual - Page 520
Solenoid assembly Delivery frame assembly Fuser assembly Tray 2 Tray 3 Drum/cartridge drive assembly Color toner cartridge Black toner cartridge Imaging drum Figure 248. Major assembly locations (2 of 2) 518 Chapter 8 - Parts and diagrams EN - HP Color LaserJet 8500 | Service Manual - Page 521
and doors Figure 249. Printer covers and doors (1 of 4)-Filler panel for tray 2 (HP Color LaserJet 8550 base model only) Table 58. Printer covers and doors (1 of 4)-Filler panel for tray 2 Ref. Description Part number 1 Filler panel for tray 2 2 Filler panel bracket for tray 2 3 Screw - HP Color LaserJet 8500 | Service Manual - Page 522
Figure 250. Printer covers and doors (2 of 4) 520 Chapter 8 - Parts and diagrams EN - HP Color LaserJet 8500 | Service Manual - Page 523
Strap, front door support Latch, roller action Cover assembly, left upper Lever, left upper door Spring, left upper door lever Cover, hinge Cover, front right Cover, left lower Tray, face-up Cover, power switch Filler panel for tray 2 Filler panel bracket for tray 2 Filler panel bracket screw for - HP Color LaserJet 8500 | Service Manual - Page 524
Figure 251. Printer covers and doors (3 of 4) 522 Chapter 8 - Parts and diagrams EN - HP Color LaserJet 8500 | Service Manual - Page 525
Printer doors and covers (3 of 4) Ref. 1 2 2 2D 5 6 6A 19 20 39 51 51A 51B Description Part number Qty. Filter, large air RB1-9807-000CN 1 Cover assembly, top RG0-0111-000CN 1 Cover assembly, top (HP CLJ 8550 RG0-0017-000CN 1 Support, cover RA0-0079-000CN 1 Spring, compression RS5- - HP Color LaserJet 8500 | Service Manual - Page 526
Figure 252. Printer covers and doors (4 of 4) 524 Chapter 8 - Parts and diagrams EN - HP Color LaserJet 8500 | Service Manual - Page 527
Table 61. Printer covers and doors (4 of 4) Ref. Description 7 Cover, right rear lever 26 Spring, torsion 31 Cover, right subassembly 32 Cover, density sensor 35 Density sensor assembly 35A Brush, cleaning 36 Preconditioning exposure LED assembly 41 Filter, charcoal 42 Fan 3 - HP Color LaserJet 8500 | Service Manual - Page 528
Internal cover assembly Figure 253. Internal cover assembly 526 Chapter 8 - Parts and diagrams EN - HP Color LaserJet 8500 | Service Manual - Page 529
parts Ref. 1 2 3 4 4A 5 6 7 10 Description Cover assembly, inner left Cover, inner 2 Cover, inner 3 Cover, inner 4 Label, "CAUTION" Waste toner tray Latch, roller action Media jam knob Cover, waste toner tray Part number RG0-0104-000CN RA0-0026-000CN RA0-0027-000CN RF0-0013-000CN RS5-8380-000CN - HP Color LaserJet 8500 | Service Manual - Page 530
Internal components Figure 254. Internal components (1 of 6) 528 Chapter 8 - Parts and diagrams EN - HP Color LaserJet 8500 | Service Manual - Page 531
stop assembly PCA, fusing delivery sensor Cover, carousel stop Connector holder assembly Cable, main Cable, sensor Cable, DC power Cable, power signal PCA, cartridge release lever Power supply assembly (110 V) Power supply assembly (220 V) Switch, toner cartridge cover (SW672) Face-up solenoid - HP Color LaserJet 8500 | Service Manual - Page 532
40 Figure 255. Internal components (2 of 6) 530 Chapter 8 - Parts and diagrams EN - HP Color LaserJet 8500 | Service Manual - Page 533
parts (2 of 6) Ref. 6 7 8 10 22 23 29 30 40 501 Description Lever assembly, transfer drum Lever assembly, pressure Bushing Lever assembly, black cartridge Switch, black toner cartridge (SW644) Photo-interrupter, IC, TLP1240 Bushing Bushing Crossmember Ring, E Part number RG5-3046-000CN RG5-3045 - HP Color LaserJet 8500 | Service Manual - Page 534
Figure 256. Internal components (3 of 6) 532 Chapter 8 - Parts and diagrams EN - HP Color LaserJet 8500 | Service Manual - Page 535
switch RB1-6463-000CN Spring, leaf RB1-6909-000CN Gear, 11T RB1-9424-000CN Sensor assembly, color toner RG5-3034-000CN Cover, cable RB1-9805-000CN Mount, clutch RB1-9828-000CN Developer/imaging drum bias supply RG5-3026-030CN High-voltage power supply RG5-3943-000CN Post charger HV - HP Color LaserJet 8500 | Service Manual - Page 536
Figure 257. Internal components (4 of 6) 534 Chapter 8 - Parts and diagrams EN - HP Color LaserJet 8500 | Service Manual - Page 537
Ref. 3 5 6 7 10 12 13 18 20 21 24 26 Description Tray rail assembly Cable, main motor Cable, carousel Cover, gear Transfer swing assembly Cable, delivery connector Lever, registration roller Main drive assembly Cable, delivery Motor, main (M4) Photo-interrupter, IC, TLP1241 Screw, RS, M3 x 6 Part - HP Color LaserJet 8500 | Service Manual - Page 538
Figure 258. Internal components (5 of 6) 536 Chapter 8 - Parts and diagrams EN - HP Color LaserJet 8500 | Service Manual - Page 539
Table 67. Internal components parts (5 of 6) Ref. 3 7 7D 14 15 17 18 24 37 Description Cover, cable Shield case assembly Rail, PCA Gear, 14T Gear, 14T Transfer drum Laser/scanner unit Sensor assembly, toner waste Screw, w/washer, M4 x 12 Part number RB1-9948-000CN RG5-3023-000CN RB2-0005-000CN - HP Color LaserJet 8500 | Service Manual - Page 540
Figure 259. Internal components (6 of 6) 538 Chapter 8 - Parts and diagrams EN - HP Color LaserJet 8500 | Service Manual - Page 541
Duct Fan 2 (FM2) Fan 1 (FM1) Static charge eliminator assembly Cleaning roller assembly Spring, torsion Bushing Spring, torsion Transfer drum cleaner holder assembly Cassette crossmember assembly Rail, tray 3 Transfer mount assembly Sensor slider assembly Part number RF5-2025-000CN RB1-9682-000CN - HP Color LaserJet 8500 | Service Manual - Page 542
drive assembly 40 Figure 260. Drum/cartridge drive assembly Table 69. Drum/cartridge drive assembly parts Ref. - 23 36 40 Description Drum/cartridge drive assembly Motor, cartridge (M3) Developing rotary ITD Guide Part number RG5-3065-000CN RH7-1328-000CN RG5-3033-000CN RB2-010-000CN Qty - HP Color LaserJet 8500 | Service Manual - Page 543
Delivery drive assembly Figure 261. Delivery drive assembly Table 70. Delivery drive assembly parts Ref. - Description Delivery drive assembly EN Part number Qty. RG5-3067-000CN 1 Illustrations and parts lists 541 - HP Color LaserJet 8500 | Service Manual - Page 544
Tray 3 assembly Figure 262. Tray 3 assembly Table 71. Tray 3 assembly parts Ref. Description - Tray 3 26 Plate, end 542 Chapter 8 - Parts and diagrams Part number - RF5-1484-000CN Qty. 1 1 EN - HP Color LaserJet 8500 | Service Manual - Page 545
Tray 2 assembly Figure 263. Tray 2 assembly Table 72. Tray 2 assembly Ref. Description - Tray 2 26 Plate, end EN Part number R98-1005-000CN RF5-1484-000CN Qty. 1 1 Illustrations and parts lists 543 - HP Color LaserJet 8500 | Service Manual - Page 546
Paper pick-up assembly 41 40 Figure 264. Paper pick-up assembly (1 of 3) 544 Chapter 8 - Parts and diagrams EN - HP Color LaserJet 8500 | Service Manual - Page 547
Figure 265. Paper pick-up assembly (2 of 3) EN Illustrations and parts lists 545 - HP Color LaserJet 8500 | Service Manual - Page 548
Figure 266. Paper pick-up assembly (3 of 3) 546 Chapter 8 - Parts and diagrams EN - HP Color LaserJet 8500 | Service Manual - Page 549
49 51 52 87 103 501 Description Paper pick-up assembly Roller, feed Roller, pick-up Pin Torsion spring Flag, paper sensing Spring, torsion Arm, sensor Photo-interrupter, IC, TLP1230 Motor, pick-up (M5) PCA, paper pick-up Screw, tapping, pan head, M4 x 10 Part number RG5-3132-000CN RF5-1834 - HP Color LaserJet 8500 | Service Manual - Page 550
frame assembly Table 74. Registration frame assembly parts Ref. - 2 3 4 6 7 8 Description Registration frame assembly Spring, torsion Arm, sensor PCA, photo-interrupter, IC, TLP1240 Cover, sensor PCA, photosensor PCA, photosensor Part number RG5-3007-000CN RB1-6409-000CN RB1-6417-000CN WG8-5210 - HP Color LaserJet 8500 | Service Manual - Page 551
Registration roller assembly Figure 268. Registration roller assembly Table 75. Registration roller assembly parts Ref. Description - Registration roller assembly Part number Qty. RG5-3009-000CN 1 EN Illustrations and parts lists 549 - HP Color LaserJet 8500 | Service Manual - Page 552
Feeder assembly Figure 269. Feeder assembly Table 76. Feeder assembly parts Ref. Description - Feeder assembly 550 Chapter 8 - Parts and diagrams Part number Qty. RG5-3059-000CN 1 EN - HP Color LaserJet 8500 | Service Manual - Page 553
Tray 1 pick-up assembly Figure 270. Tray 1 pick-up assembly Table 77. Tray 1 pick-up assembly parts Ref. - 10 40 Description Tray 1 pick-up assembly Roller, tray 1 pick-up Photo-interrupter, IC, TLP1240 EN Part number RG5-3054-000CN RB1-9526-000CN WG8-5210-000CN Qty. 1 1 1 Illustrations and - HP Color LaserJet 8500 | Service Manual - Page 554
Tray 1 assembly Figure 271. Tray 1 assembly Table 78. Tray 1 assembly parts Ref. Description - Tray 1 assembly 552 Chapter 8 - Parts and diagrams Part number Qty. RG5-3134-000CN 1 EN - HP Color LaserJet 8500 | Service Manual - Page 555
Delivery assembly Figure 272. Delivery assembly Table 79. Delivery assembly parts Ref. Description - Delivery assembly 11 Lever, paper sensing 12 Lever, paper height EN Part number RG0-0110-000CN RB1-6692-000CN RA0-0112-000CN Qty. 1 1 1 Illustrations and parts lists 553 - HP Color LaserJet 8500 | Service Manual - Page 556
Delivery cover assembly Figure 273. Delivery cover assembly Table 80. Delivery cover assembly parts Ref. - 12 13 24 Description Delivery cover assembly Holder, flapper Cover, left upper Hinge, stopper (delivery) 554 Chapter 8 - Parts and diagrams Part number RG5-3108-000CN RB1-9751-000CN RB2- - HP Color LaserJet 8500 | Service Manual - Page 557
Transfer belt assembly Figure 274. Transfer belt assembly Table 81. Transfer belt assembly parts Ref. Description - Transfer belt assembly Part number Qty. RG5-3047-000CN 1 EN Illustrations and parts lists 555 - HP Color LaserJet 8500 | Service Manual - Page 558
Fuser assembly Figure 275. Fuser assembly (1 of 2) 556 Chapter 8 - Parts and diagrams EN - HP Color LaserJet 8500 | Service Manual - Page 559
Figure 276. Fuser assembly (2 of 2) EN Illustrations and parts lists 557 - HP Color LaserJet 8500 | Service Manual - Page 560
Table 82. Fuser assembly parts Ref. - 8 9 25 Description Fuser assembly (120 V) Fuser assembly (220 V) Lever, holding, right Lever, holding, left Lever, release Part number RG5-3060-000CN RG5-3061-000CN RB1-9704-000CN RB1-9705-000CN RB1- - HP Color LaserJet 8500 | Service Manual - Page 561
, controller board for HP CLJ 8550 MFP FG2-9470-000CN 4 PCA, carousel motor (M1) RG5-3084-020CN 5 PCA, subrelay RG5-3085-000CN 6 PCA, tray 1 RG5-1884-000CN 7 PCA, ECO-2 assembly (HP CLJ 8550 MPF) FG6-3597-000CN Interface PCB assembly (HP CLJ 8550 MPF) FG2-9545-000CN Interface cable (HP - HP Color LaserJet 8500 | Service Manual - Page 562
2,000-sheet input unit components Figure 278. 2,000-sheet input unit covers and doors 560 Chapter 8 - Parts and diagrams EN - HP Color LaserJet 8500 | Service Manual - Page 563
87 88 89 Kit 1 Description Cover, back Cassette size labels Cassette size plate Casters Feed and separation rollers Cover, front (with LED window) Cover, left rIght Cover, top (label included) Vertical transfer unit (VTU) Screws kit (2,000-sheet input unit) Part number RB2-2519-000CN RS5-8611- - HP Color LaserJet 8500 | Service Manual - Page 564
Figure 279. 2,000-sheet input unit internal components 562 Chapter 8 - Parts and diagrams EN - HP Color LaserJet 8500 | Service Manual - Page 565
Metallic retaining tab (plate stop) Outriggers Paper deck PCA Paper quantity sensor PCA assembly Paper size sensor PCA assembly Power supply cable Power supply fuse 250 V, 3.15 A Spring, tension Universal power supply assembly Screws kit (2,000-sheet input unit) Part number RG5-4204-000CN RG5-3919 - HP Color LaserJet 8500 | Service Manual - Page 566
Multi-bin mailbox components Figure 280. Multi-bin mailbox components (1 of 3) 564 Chapter 8 - Parts and diagrams EN - HP Color LaserJet 8500 | Service Manual - Page 567
27 28 29 30 31 Kit 1 Kit 3 Description User LED PCA (with cable) Adjustable fixed caster Attachment assembly (rod, bracket, cables) Blind cover Face-down input unit in order to install a multi-bin mailbox. Multi-bin mailbox controller (with metal box) Caster, fixed Cover, top Plastic parts 1G Spacer - HP Color LaserJet 8500 | Service Manual - Page 568
Figure 281. Multi-bin mailbox components (2 of 3) 566 Chapter 8 - Parts and diagrams EN - HP Color LaserJet 8500 | Service Manual - Page 569
Table 87. Multi-bin mailbox component parts (2 of 3) Ref. 32 33 34 Kit 1 Kit 3 Description Flipper assembly (with cable "request") Head assembly (with metallic tape) Metallic tape and housing assembly Plastic parts 1A Anti-curl string 1B Spring for anti-curl string 1C Pulley, - HP Color LaserJet 8500 | Service Manual - Page 570
Figure 282. Multi-bin mailbox components (3 of 3) 568 Chapter 8 - Parts and diagrams EN - HP Color LaserJet 8500 | Service Manual - Page 571
Input paper guide (nosepiece) Power supply Transport belt motor (with fan) Plastic parts 1D Cable holder round gasket 1E Flat cable holder edge 1F Flat cable holder Cables 2A Switch, interlock 2B Delivery head motor cable 2C Flipper sensor controller cable 2D Flipper encoder controller 2E Flipper - HP Color LaserJet 8500 | Service Manual - Page 572
3,000-sheet stapler/stacker components 5 4 3 2 1 6 7 Figure 283. 3,000-sheet stapler/stacker components (1 of 2) 570 Chapter 8 - Parts and diagrams EN - HP Color LaserJet 8500 | Service Manual - Page 573
with label (for stapler/ C4788-60507 stacker) Stacker door assembly (for stacker) C4779-60502 7 Controller PCA cover (with label) (for stapler/ C4788-60508 stacker) Controller PCA cover (with label) (for stacker) C4779-60503 Qty. 1 1 1 1 1 1 1 1 1 1 EN Illustrations and parts lists - HP Color LaserJet 8500 | Service Manual - Page 574
9 8 20 21 10 22 19 11 18 15 17 16 12 13 14 Figure 284. 3,000-sheet stapler/stacker components (2 of 2) 572 Chapter 8 - Parts and diagrams EN - HP Color LaserJet 8500 | Service Manual - Page 575
C4788-60501 10 Flipper ribbon cable C4788-60524 11 Stapler (applies Stapler controller PCA (for stapler/stacker) C4788-60509 Stacker controller switch assembly C4788-60517 Wings kit (stapler/stacker) C4788-60521 Paper stacker clip C4788-60527 Optical sensors kit C4779-60509 Qty. 1 1 - HP Color LaserJet 8500 | Service Manual - Page 576
, French, 8500 models - Control panel overlay, Swedish, 8500 models - HP Color LaserJet 8500, 8500 N, 8500 DN - Getting Started Guide (English) Kit of rollers-jam access door (multi-bin 280 mailbox) Metallic tape and housing assembly 281 Power supply 282 User LED PCA (with cable) 280 - HP Color LaserJet 8500 | Service Manual - Page 577
panel overlay, Norwegian, 8500 models - Control panel overlay, Finnish, 8500 models - Control panel overlay, Danish, 8500 models - Control panel overlay, Italian, 8500 models - Control panel overlay, Russian, 8500 models - HP Color LaserJet 8500, 8500N, 8500 DN Self- - Paced Training Kit - HP Color LaserJet 8500 | Service Manual - Page 578
Guide (English) HP Color LaserJet 8500, 8500N, 8500 DN - Service and Support CD-ROM HP Color LaserJet 8500, 8500 N, 8500 DN - User's Guide (English) Black toner cartridge - Cyan toner cartridge - Magenta toner cartridge - Yellow toner cartridge - Drum kit - Imaging drum Two - HP Color LaserJet 8500 | Service Manual - Page 579
282 2A Switch, interlock 2B Delivery head motor cable 2C Flipper sensor controller cable 2D Flipper encoder controller 2E Flipper motor controller 2F ESD cable 2G Delivery head assembly, flat cable Ref. - - - - 24 23 26 37 33 30 21 36 - 35 22 41 Kit 1 Kit 2 EN Numerical parts list 577 - HP Color LaserJet 8500 | Service Manual - Page 580
Flipper assembly (with cable "request") 281 Multi-bin mailbox, short C-link cable adapter - (extension) Multi-bin mailbox controller (with metal box) install a multi-bin mailbox. Multi-bin mailbox, shipping lock kit - Flipper assembly 284 Accumulator assembly (stapler/stacker) 284 - HP Color LaserJet 8500 | Service Manual - Page 581
ribbon cable 284 Paper stacker clip 284 Stapler bin (for stapler/stacker) 283 Control panel overlay, Turkish, 8550 models - Control panel overlay, Polish, 8550 models - Control panel overlay, English, 8550 models - Control panel overlay, Traditional Chinese, 8550 - models Control panel - HP Color LaserJet 8500 | Service Manual - Page 582
, front right Stop, flip-up media Cover, right rear lower corner Cover, auxiliary Support, cover Cover, waste toner tray Lever, paper height Pin Strap, front door support Latch, roller action Spring, torsion Arm, sensor Rod, power switch Cover, left lower Stopper, open/close Lever, left upper door - HP Color LaserJet 8500 | Service Manual - Page 583
-up Cover, density sensor Cover, tray 1 side gear Lever, registration roller Cover, sensor Brush, cleaning Spring, compression Duct Lever, holding, right Lever, holding, left Lever, release Holder, flapper Cover, carousel stop Spring, torsion Crossmember Waste toner tray Cover, cable Filter, large - HP Color LaserJet 8500 | Service Manual - Page 584
-000CN RG0-0104-000CN RG0-0110-000CN RG0-0111-000CN RG0-0112-000CN Media jam knob Cover, cable Gear, 14T Gear, 14T Rail, PCA ITD guide Cover, left upper Filler panel for tray 2 Filler panel bracket for tray 2 Cover, back Latch, roller action Cover, fan Cover, inner 4 Rail, tray 3 Plate, end Feed - HP Color LaserJet 8500 | Service Manual - Page 585
assembly Shield case assembly Developer/imaging drum bias supply Connector holder assembly PCA, photosensor Developing rotary Sensor assembly, color toner PCA, main relay PCA, controller board, 8500 models PCA, controller board, 8550 models Transfer drum Transfer drum contact assembly Lever assembly - HP Color LaserJet 8500 | Service Manual - Page 586
-000CN RG5-3851-000CN RG5-3854-000CN RG5-3908-000CN RG5-3909-000CN RG5-3919-000CN Density sensor assembly Feeder assembly Fuser assembly (120 V) Fuser assembly (220 V) Drum/cartridge drive assembly Main drive assembly Delivery drive assembly PCA, photosensor PCA, photosensor PCA, carousel motor (M1 - HP Color LaserJet 8500 | Service Manual - Page 587
, power signal Cable, carousel Sensor assembly, toner waste Laser/scanner unit Cable, main motor High-voltage power supply PCA, cartridge release lever Hinge, stopper (tray 1 delivery assembly) Separation discharge high-voltage converter PCA Static charge eliminator assembly Cleaning roller assembly - HP Color LaserJet 8500 | Service Manual - Page 588
Spring, torsion Spring, torsion Spring, compression Label, "CAUTION" Cassette size labels Screw kit (2,000-sheet input unit) Power supply fuse 250 V, 3.15 A Switch, black toner cartridge (SW644) Switch, toner cartridge cover (SW672) Photo-interrupter, IC, TLP1230 Photo-interrupter, IC, TLP1240 Photo - HP Color LaserJet 8500 | Service Manual - Page 589
-6417-000CN Arm, sensor RG5-1859-000CN Attachment assembly (rod, bracket, cables) C4785-60516 Attachment assembly (rod, bracket, cables) C4788-60523 Attachment clip C4785-60512 Back cover C4788-60504 Black toner cartridge C4149A Blind cover C4785-60503 Brush, cleaning RB1-9617-000CN - HP Color LaserJet 8500 | Service Manual - Page 590
C-link cable (from formatter board to the 2,000- C4781-60504 sheet input unit) Clutch, transfer belt press (CL4) RH7-5168-000CN Connector holder assembly RG5-3031-000CN Control panel overlay, Czech, 8500 models C3983-40016 Control panel overlay, Czech, 8550 models C7096-40019 Control panel - HP Color LaserJet 8500 | Service Manual - Page 591
Control panel overlay, Danish, 8550 models C7096-40016 Control panel overlay, Dutch, 8500 models C3983-40009 Control panel overlay, Dutch, 8550 models C7096-40012 Control panel overlay, English, 8500 models C3983-40001 Control panel overlay, English, 8550 models C7096-40004 Control panel - HP Color LaserJet 8500 | Service Manual - Page 592
-60505 Cover, back RB2-2519-000CN Cover, cable RB1-9805-000CN Cover, cable RB1-9948-000CN Cover, carousel stop RB1-9789-000CN Cover, density sensor RB1-9537-000CN Cover, fan RF0-0012-000CN Cover, front C4785-60504 Cover, front (with LED window) RF5-2568-000CN Cover, front right RA0 - HP Color LaserJet 8500 | Service Manual - Page 593
toner cartridge Delivery assembly Delivery cover assembly Delivery drive assembly Delivery head position motor Density sensor assembly Developer/imaging drum bias supply Developing rotary Diagnostic LED PCA (with cable) Drum kit Imaging drum Two air filters Hand wipe Drum/cartridge -60514 C4153A RG5- - HP Color LaserJet 8500 | Service Manual - Page 594
1834-000CN Feeder assembly RG5-3059-000CN Filler panel bracket for tray 2 RB2-0208-000CN Filler panel for tray 2 RB2-0207-000CN Filter, C4788-60505 Front LED PCA with holder and cable RG5-4204-000CN Fuser assembly (120 V) RG5-3060-000CN Fuser assembly (220 V) RG5-3061-000CN Gear, - HP Color LaserJet 8500 | Service Manual - Page 595
Color LaserJet 8500, 8500 N, 8500 DN User's Guide (English) C3989-90937 HP Color LaserJet 8500, 8500N, 8500 DN Self- C3983-67902 Paced Training Kit (NTSC) HP Color LaserJet 8500, 8500N, 8500 DN Self- C3893-67903 Paced Training Kit (PAL) HP Color LaserJet 8500, 8500N, 8500 DN Service and Support - HP Color LaserJet 8500 | Service Manual - Page 596
HP JetDirect Software Installation Guide (English) 5966-5171 HP LaserJet Printer Family Paper Specification 5021-8956 Guide HP LocalTalk cable kit 92215N HP Peripherals Connectivity Solutions Guide cartridge RG5-3087-000CN Lever assembly, pressure RG5-3045-000CN Lever assembly, transfer drum - HP Color LaserJet 8500 | Service Manual - Page 597
Table 92. Alphabetical parts list (continued) Description Part number Macintosh DIN-8 printer cable 92215S Magenta toner cartridge C4151A Main drive assembly RG5-3066-000CN Media jam knob RB1-9928-000CN Metallic retaining spring (spring leaf) RB1-7835-000CN Metallic retaining tab (plate - HP Color LaserJet 8500 | Service Manual - Page 598
(continued) Description Part number Figure Ref. PCA, carousel motor (M1) PCA, cartridge release lever PCA, cassette-size sensing PCA, controller board, 8500 models PCA, controller board, 8550 models PCA, fusing delivery sensor PCA, main relay PCA, paper pick-up PCA, photosensor PCA, photosensor - HP Color LaserJet 8500 | Service Manual - Page 599
kit (2,000-sheet input unit) Screw, RS, M3 x 6 Screw, tapping, pan head, M4 x 10 Screw, TP, M3 x 6, quantity=10 Screw, TP, M4 x 8, filler panel bracket for tray 2 Screw, TP, M4 x 8, quantity=10 Screw, w/washer, M3 x 8, quantity=10 Screw, w/washer, M4 x 12, quantity=4 Sensor assembly, color toner - HP Color LaserJet 8500 | Service Manual - Page 600
/ stacker) Stapler refill housing Static charge eliminator assembly Stationary caster Stop, flip-up media Stopper, open/close Strap, front door support Support, cover Switch, black toner cartridge (SW644) RG5-3966-000CN RG5-3023-000CN RB1-6486-000CN RB1-9675-000CN RS5-2719-000CN RB1-6909-000CN RB1 - HP Color LaserJet 8500 | Service Manual - Page 601
(continued) Description Part number Switch, toner cartridge cover (SW672) Token Ring Torsion spring Transfer belt assembly Transfer drum Transfer drum cleaner holder assembly Transfer drum contact assembly Transfer kit Transfer drum Transfer belt Cleaning roller Charcoal filter Hand wipe Transfer - HP Color LaserJet 8500 | Service Manual - Page 602
600 Chapter 8 - Parts and diagrams EN - HP Color LaserJet 8500 | Service Manual - Page 603
211 control panel messages 491 controller PCA 353 door assemblies 342 interlock switch 356 internal assemblies 342 jam detection 213 LED PCA 354 paper path 214 paper path sensors 213 power supply 212, 355 printer model included with 22 safety switch 357 service mode 487 troubleshooting 482 - HP Color LaserJet 8500 | Service Manual - Page 604
Driver Distribution Center 66 HP FIRST 64 ASAP (Automated Support Access Program) 64 ASIC test 95 assemblies black cartridge cam 517 black cartridge guide 517 cleaning roller HV module 291 delivery 517 delivery cover 554 delivery drive 285, 517 delivery frame 518 drum/cartridge paper size sensor 311 - HP Color LaserJet 8500 | Service Manual - Page 605
paper path 433 pretroubleshooting 367 circuits capacity 24 fuser abnormality detection 166 fusing heater safety 166 high-voltage power supply 167 laser/scanner motor lock detection 170 power distribution 164 Power Save 165 cleaning density sensor 389 images 150 imaging drum 152 EN Index 603 - HP Color LaserJet 8500 | Service Manual - Page 606
installation 105 configurations, printer 39 configuring Append CR to LF 90 binding 86 clearable warnings 88 color values 92 control panel 82 default orientation 89 default paper size 89 duplex printing 86 form length 89 I/O timeout 91 input trays 85, 103 low and out messages 88 manual feed 87 media - HP Color LaserJet 8500 | Service Manual - Page 607
Line 67 Customer Care Online 62 Customer Information Centers 66 Customer Support Sales Center 66 cyan detail value 92 smooth value 92 cyan toner cartridge installing 101 location 118 replace frequency 119 D damaged media 395 transfer drum 389 Data Indicator light 80 data, corrupt PJL 405 Dealer - HP Color LaserJet 8500 | Service Manual - Page 608
access 388 density sensor cleaning 389 description 160 error 378 removing 266 depth of printer 25 detail color value 92 developer DSD wheels, repetitive defects 464 developer motor test 96 developer roller repetitive defects 464 developer streak print defect 453 developer/imaging drum bias supply - HP Color LaserJet 8500 | Service Manual - Page 609
24 EP process. See image formation EPH (external paper-handling) controller board 199, 207 error log 469 errors 2,000-sheet input unit 384, 385 breaks and pauses 95 carousel 377 controller 386 cycle power 382 density sensor 378 DIMM 376 firmware 373 flipper 480 fuser 373 illegal output 379 input - HP Color LaserJet 8500 | Service Manual - Page 610
(HP FIRST) Europe 65 U.S. 64 FCC regulations 46 features control panel 80 EIO 23 fonts 23 model differences 22 personality 23 print speeds 23 resolution 23 user interface 23 feed roller clutch 189 feed rollers 2,000-sheet input unit 204 printer 136 feeder assembly 257, 550 feeding error 379 manual - HP Color LaserJet 8500 | Service Manual - Page 611
resolution 23 guide, input paper. See input paper guide (multi-bin mailbox) H half-toning 139 handling media 29 toner 57 hard disk accessories 22 failure 396 lower and upper fuser 171 names and locations 171 heavy media using 36 See also media height of printer 25 Hewlett-Packard Distribution (HPD) - HP Color LaserJet 8500 | Service Manual - Page 612
input/output (I/O). See I/O (input/output) inside left panel 230 installing air filters 124 black toner cartridge 100 cables 74, 75 charcoal filter 120 consumables 98, 119 DIMMs 106 fuser kit 127 imaging drum 99 imaging drum kit 124 parts 217 printer on network 76 rollers 127 safety 222 transfer - HP Color LaserJet 8500 | Service Manual - Page 613
language control panel overlay 79 not available 407 selecting display 97 laser error 375 illustration 136 EN motor lock detection circuit 170 process 169 removing 247 safety statement 55 scanner error 371 statement for Finland 56 laser beam exposure on imaging drum 144 process 169 LaserJet printing - HP Color LaserJet 8500 | Service Manual - Page 614
293 maintenance black toner cartridge 100 color toner cartridges 101 consumables 98 imaging drum 99 strategy 222 user-replaceable parts 224 maintenance units. See consumables manual feed 87, 404 manuals, ordering 62 manufacturing codes for toner cartridges 456 margin 34 matching colors 440 Material - HP Color LaserJet 8500 | Service Manual - Page 615
parts list 512 PCL full 405 shortage 404 Menu key 80 menu maps description 82 printing 83 menus Color Adjust 92 Configuration 88 control panel 82 duplex registration 91 I/O 91 Information 83 Paper Handling 85 Printing 89 Proof and Print 84, 85 Quick Copy Jobs 84 Resets 92 Service Mode 93 messages - HP Color LaserJet 8500 | Service Manual - Page 616
-on sequence 206 power-up sequence test 478 printer model included with 22 removable parts 314 removing 253 sensors, switches, motors, and controller board 208 top cover 316 top output bin (face-up) full 398 transport belt motor 322 troubleshooting 477 unlatched 480 user status LED PCA 336 multipart - HP Color LaserJet 8500 | Service Manual - Page 617
by part 516 cables 513 consumables, options, and accessories 512 control panel overlays 514 covers and doors (2,000-sheet input unit) 560 covers and doors (printer) 525 delivery assembly 553 delivery cover assembly 554 delivery drive assembly 541 DIMMs 512 drum kit 513 drum/cartridge drive assembly - HP Color LaserJet 8500 | Service Manual - Page 618
toner cartridges 513 transfer assembly 555 transfer kits 513 upper cassette assembly 543 PCAs assemblies 559 carousel motor 282 developer/imaging drum bias supply 289 high-voltage power supply 291 main relay 293 power supply circuit 167 separation discharge high-voltage converter 295 subrelay 252 - HP Color LaserJet 8500 | Service Manual - Page 619
installation 105 weight 25 printer command language (PCL). See PCL (printer command language) printer control language (PCL). See PCL (printer command language) printer control panel. See control panel printer drivers color selection 440 handled by HP Driver Distribution Center 66 obtaining - HP Color LaserJet 8500 | Service Manual - Page 620
display language 97 media 29 self-test mode 479 sensors carousel position 162, 185 cleaning density 389 color cartridge 157, 251 color toner cartridge 185 color toner level 157 color toner lever 158, 185 defective or stuck 434 density 160, 266 density error 378 face-down tray delivery 178 618 Index - HP Color LaserJet 8500 | Service Manual - Page 621
input trays 31 overriding media 87 printer 25 sliders problem 480 SLx. See solenoids SME (Support Materials Europe), ordering from 61 SMO (Service Materials Organization), ordering from 61 smooth color value 92 software matrix 64 ordering 62 support from HP FIRST 64 solenoids assembly 518 carousel - HP Color LaserJet 8500 | Service Manual - Page 622
64 HP Direct 66 HP FIRST 64 HP JetDirect 502 HP Software Distribution Center 66 technical 64 third-party 502 websites 62 Support Materials Europe (SME) ordering information 61 620 Index switches black toner cartridge 187 carousel button 187 defective 433 delivery cover/front cover 187 imaging drum - HP Color LaserJet 8500 | Service Manual - Page 623
sensors 185 thermo switches 185 thermographic inks 37 ThinLAN cables, using 77 third-party support 502 timeout for I/O 91 timing charts description 192 full color 11-by-17-inch sized page 197 full color letter-sized page 195 WAIT period 193 Token Ring 512 toner black level detection 159 cartridge - HP Color LaserJet 8500 | Service Manual - Page 624
automatic detection 179 for ink jet printers 37 parts list 513 print speeds 23 process 179 reducing curl 433 sensors 179, 183, 185 using 35 433 empty 413 jams 392 media specifications 31 toner catch 116 See also tray 1; tray 2; tray 3; tray 4 troubleshooting 2,000-sheet input unit 469, 474 3,000 - HP Color LaserJet 8500 | Service Manual - Page 625
205 VTU (vertical transfer unit) closed sensor 200 clutch 200 door open 399 illustration 204 process 201 removing 302 rollers 204 VX ASIC test 95 W warnings configuring 88 control panel 368 warranty printer 69 toner cartridge 69 waste toner catch tray 116 cleaning 116 collection 152 feed roller 152 - HP Color LaserJet 8500 | Service Manual - Page 626
624 Index EN - HP Color LaserJet 8500 | Service Manual - Page 627
- HP Color LaserJet 8500 | Service Manual - Page 628
Printed on Recycled Paper Copyright© 2000 Hewlett-Packard Co. Printed in the USA Manual Part No. C7096-90967 *C7096-90967* *C7096-90967* C7096-90967
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 |
 |
Service Manual
English
8500/8550 Printer Family