Lexmark T642 Service Manual
Lexmark T642 - Monochrome Laser Printer Manual
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- Lexmark T642 | Service Manual - Page 1
Revised September 27, 2005 Lexmark™ T640, T642, and T644 4061-xx0 • Table of Contents • Start Diagnostics • Safety and Notices • Trademarks • Index Lexmark and Lexmark with diamond design are trademarks of Lexmark International, Inc., registered in the United States and/or other countries. - Lexmark T642 | Service Manual - Page 2
4061-xx0 Edition: September 27, 2005 The following paragraph does not apply to any country where such provisions are inconsistent with local law: LEXMARK INTERNATIONAL, INC. PROVIDES THIS PUBLICATION "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE - Lexmark T642 | Service Manual - Page 3
first print 1-3 Memory configuration 1-4 Operating clearances 1-4 Dimensions 1-5 Power requirements 1-6 Electrical specifications 1-6 Environment 1-7 Acoustics 1-7 Media specifications 1-8 Paper and specialty media guidelines 1-8 Supported print media 1-8 Selecting print media 1-15 Paper - Lexmark T642 | Service Manual - Page 4
fan 2-76 Cartridge fan service check 2-76 950.00 through 950.29 EPROM mismatch failure 2-77 950.30 through 950.60 EPROM mismatch failure 2-78 Charge roll service check 2-79 Cover closed switch/cable service check 2-80 Dead machine service check 2-80 Duplex option service check 2-82 Envelope - Lexmark T642 | Service Manual - Page 5
check 2-122 Signature button assembly service check 2-122 StapleSmart finisher service check 2-123 System board service check 2-126 Toner sensor service check 2-127 Transfer roll service check 2-128 Diagnostic aids 3-1 Accessing service menus 3-1 Diagnostics mode 3-2 Entering Diagnostics - Lexmark T642 | Service Manual - Page 6
27 PPDS Emulation 3-27 Download Emuls 3-27 Demo Duplex Option 3-32 Option microcode 3-32 Print quality troubleshooting 3-33 Paper feed jams 3-37 Access doors and trays 3-37 Clearing printer jams 3-37 250 Paper Jam Check MP Feeder 3-38 260 Paper Jam Check Env Feeder 3-39 vi Service Manual - Lexmark T642 | Service Manual - Page 7
and 201 Paper Jam Remove Cartridge 3-41 202 Paper Jam Open Rear Door 3-43 23x Paper Jam Open Duplex Rear Door 3-44 270 Redrive cap cover removal 4-5 Paper support removal 4-5 Left door removal 4-6 thru plate 4-18 Laser cover removal 4-19 Bevel gear removal 4-21 Cartridge duct removal 4-23 - Lexmark T642 | Service Manual - Page 8
4-75 System board and inner shield removal 4-76 Toner sensor removal 4-77 Transfer roll assembly removal 4-77 5-12 Preventive maintenance 6-1 Safety inspection guide 6-1 Lubrication specifications 6-1 Scheduled maintenance 6-1 Maintenance kit 6-1 power supplies 7-28 viii Service Manual - Lexmark T642 | Service Manual - Page 9
or installing a flash memory or firmware card A-8 Removal A-8 Installation A-9 Installing an option card A-10 Replacing the shield A-11 Printing and using features A-11 Canceling a print job A-11 Printing the menu settings page A-13 Printing a network setup page A-13 Printing a font - Lexmark T642 | Service Manual - Page 10
4061-xx0 Printing a directory list A-14 Printing confidential and held jobs A-14 Linking trays A-17 Identifying and linking output bins A-18 Linking output bins A-20 Index I-1 Part number index I-9 x Service Manual - Lexmark T642 | Service Manual - Page 11
in the wavelength region of 770-795 nanometers. The laser system and printer are designed so there is never any human access to laser radiation above a Class I level during normal operation, user maintenance, or prescribed service condition. Laser Der Drucker erfüllt gemäß amtlicher Bestätigung der - Lexmark T642 | Service Manual - Page 12
e 795 nanómetros. O sistema e a impressora laser foram concebidos de forma a nunca existir qualquer possiblidade de acesso humano a radiação laser superior a um nível de Classe I durante a operação normal, a manutenção feita pelo utilizador ou condições de assistência prescritas. xii Service Manual - Lexmark T642 | Service Manual - Page 13
Subchapter J, voor andere landen in IEC 60825-1. Laserprodukten van klasse I worden niet als ongevaarlijk aangemerkt. De printer is voorzien van een laser van klasse IIIb (3b), dat wil zeggen een gallium arsenide-laser van 5 milliwatt met een golflengte van 770-795 nanometer. Het lasergedeelte en de - Lexmark T642 | Service Manual - Page 14
I-nivå vid normal användning, underhåll som utförs av användaren eller annan föreskriven serviceåtgärd. Laser-melding Skriveren er godkjent i USA etter kravene i DHHS 21 CFR, underkapittel J, for klasse I (1) d'usuari ni durant els serveis que satisfacin les condicions prescrites. xiv Service Manual - Lexmark T642 | Service Manual - Page 15
Japanese Laser Notice 4061-xx0 Laser notices xv - Lexmark T642 | Service Manual - Page 16
4061-xx0 Korean Laser Notice xvi Service Manual - Lexmark T642 | Service Manual - Page 17
is based on testing and approvals of the original design and specific components. The manufacturer is not responsible for safety in the event maintenance information for this product has been prepared for use by a professional service person and is not intended to be used by others. • There may - Lexmark T642 | Service Manual - Page 18
çar, desligue o produto da tomada eléctrica ou seja cuidadoso caso o produto tenha de estar ligado à corrente eléctrica para realizar a tarefa necessária. xviii Service Manual - Lexmark T642 | Service Manual - Page 19
4061-xx0 Informació de Seguretat • La seguretat d'aquest producte es basa en l'avaluació i aprovació del disseny original i els components específics. El fabricant no es fa responsable de les qüestions de seguretat si s'utilitzen peces de recanvi no autoritzades. • La informació pel - Lexmark T642 | Service Manual - Page 20
problems. 4. Repair information provides instructions for making printer adjustments and removing and installing FRUs. 5. Connector locations uses illustrations to identify the connector locations and test points on the printer. 6. Preventive maintenance contains the lubrication specifications - Lexmark T642 | Service Manual - Page 21
and to most computer networks. The Lexmark T64x laser printers are available in the following models: Model name Lexmark T640 Lexmark T640n Lexmark T642 Lexmark T642n Lexmark T644 Lexmark T644n Configuration Non-network Network Non-network Network Non-network Network Machine type 4061-000 - Lexmark T642 | Service Manual - Page 22
are using a 2000-sheet drawer, a duplex unit and an input option, or more than one input option. If you purchased a multifunction printer (MFP) that scans, copies, and faxes, you may need additional furniture. Refer to www.lexmark.com/multifunctionprinters for more information. 1-2 Service Manual - Lexmark T642 | Service Manual - Page 23
, parallel, network) • Host system and application • Page complexity and content • Printer options installed or selected • Available printer memory • Media size and type • Resolution Time to first print Lexmark T640, Lexmark T640n Lexmark T642, Lexmark T642n Lexmark T644, Lexmark T644n 1200 - Lexmark T642 | Service Manual - Page 24
576 640 640 640 Optional flash memory 32 and 64 MB available Note: One firmware card and one flash memory card are supported. Either slot supports both card types. Depending upon the options and features used, additional memory may be required to optimize performance. Available memory options - Lexmark T642 | Service Manual - Page 25
4061-xx0 Dimensions Description Printer Lexmark T640 (base printer) Lexmark T642 (base printer) Lexmark T644 (base printer) Options Duplex 250-page option Duplex 500-page option 250-Sheet drawer 500-Sheet drawer 2,000-Sheet drawer Output Expander 5-Bin Mailbox High-capacity output stacker - Lexmark T642 | Service Manual - Page 26
Lexmark T640 Lexmark T640n .05 W 20 W 90 W 675 W 7.8 A 7.2 A 3.4 A Lexmark T642 Lexmark T642n .05 W 20 W 95 W 830 W 8.9 A 8.0 A 4.1 A Lexmark T644 Lexmark T644n .05 W 20 W 95 W 830 W 8.9 A 8.0 A 4.1 A Electrical specifications with the 110 volt printer is not recommended. • All models are ENERGY - Lexmark T642 | Service Manual - Page 27
4061-xx0 Environment Printer temperature and humidity • Operating - Temperature: 16 to 32° C (60° to 90 Duplex printing 55 dBA Lexmark T642(n) Idle (standby mode) 32 dBA Simplex printing 54 dBA Duplex printing 57 dBA Lexmark T644(n) Idle (standby mode) 30 dBA Simplex printing 55 Duplex - Lexmark T642 | Service Manual - Page 28
• Storing print media • Avoiding jams For more details about the types of paper and specialty media your printer supports, refer to the Card Stock & Label Guide available on our Lexmark Web site at www.lexmark.com. We recommend that you try a limited sample of any paper or specialty media you are - Lexmark T642 | Service Manual - Page 29
drawer (option) Envelope feeder (option) Duplex unit (option) Standard output bin Output expander (option) 5-bin mailbox (option) High-capacity output stacker (option) StapleSmart output bin StapleSmart Finisher Print media size (✓- indicates support) Dimensions (UAT - universally adjustable tray - Lexmark T642 | Service Manual - Page 30
label1 ✓ ✓ ✓ ✓ ✓ ✓ ✓ 1 Printing label applications on the printer requires a special label fuser cleaner which prevents duplexing. The label fuser cleaner is included with a special label cartridge for label applications. 2 Vinyl labels may require a special media tray. 1-10 Service Manual - Lexmark T642 | Service Manual - Page 31
m2 (65 lb) Transparencies Laser printer 138 to 146 g/m2 duplexing. 3 28 lb envelopes are limited to 25% cotton content. 4 Includes envelopes fed from the multipurpose feeder only. 5 Information on whether your vinyl label converter has passed the Lexmark's criteria is available at www.lexmark - Lexmark T642 | Service Manual - Page 32
supported in Laser printer 138 duplexing. 3 28 lb envelopes are limited to 25% cotton content. 4 Includes envelopes fed from the multipurpose feeder only. 5 Information on whether your vinyl label converter has passed the Lexmark's criteria is available at www.lexmark.com. 1-12 Service Manual - Lexmark T642 | Service Manual - Page 33
4061-xx0 Media sizes supported in the finisher Size Dimensions Finisher output support Standard1 Offset A4 210 x 297 mm ✓ ✓ (8.27 x 11.7 in.) A5 148 x 210 mm (5.83 x 8.27 in.) JIS B5 182 x 257 mm ✓ (7.17 x 10.1 in.) Letter - Lexmark T642 | Service Manual - Page 34
supported in the finisher Print media Paper Card stock- maximum (grain long) Card stock- maximum (grain short) Transparencies Integrated forms Labels - upper limit Envelopes Type Xerographic or business paper Index Bristol Tag Cover Index Bristol Tag Cover Laser printer 1-14 Service Manual - Lexmark T642 | Service Manual - Page 35
for your printer helps you avoid printing problems. The following sections contain guidelines for choosing the correct print media for your printer. • refer to the Card Stock & Label Guide located on the Lexmark Web site at www.lexmark.com. The laser printing process heats paper to high temperatures - Lexmark T642 | Service Manual - Page 36
the printer driver or the Local Printer Setup Utility to avoid damaging your printer. • Use transparencies designed specifically for laser printers. Card Stock & Label Guide, which is available on the Lexmark Web site at www.lexmark.com. Transparencies can be undamaged envelopes. 1-16 Service Manual - Lexmark T642 | Service Manual - Page 37
, characteristics, and design, refer to the Card Stock & Label Guide available on the Lexmark Web site at www.lexmark.com/publications. Note: Labels are one of the most difficult print media for laser printers. All printer models require a special fuser cleaner for label applications to optimize - Lexmark T642 | Service Manual - Page 38
print quality. See "Supported print media" on page printer driver, in the Local Printer Setup Utility, or from MarkVision. • Be aware that preprinting, perforation, and creasing can significantly affect the print quality and cause print media handling or jamming problems printer. 1-18 Service Manual - Lexmark T642 | Service Manual - Page 39
trouble-free printing. See "Supported print media" on page 1-8 for more information. Note: Try a limited sample of any print media you are considering using with the printer or duplex guides in the trays are properly positioned for the size of print media you have loaded. Make sure the guides driver - Lexmark T642 | Service Manual - Page 40
-xx0 Acronyms BLDC CRU CSU DIMM DRAM DVM EDO EEPROM EP EPROM ESD FRU GB HCIT HVPS ITC LASER LCD LED LVPS MPF MROM MS NVRAM OEM OPT PC pel POR POST PP PWM RIP ROM SDRAM Universally Adjustable Tray) Used Parts Return Volts alternating current Volts direct current Volt Ohmmeter 1-20 Service Manual - Lexmark T642 | Service Manual - Page 41
printer. They will lead you to solutions or service checks printer symptoms" on page 2-5 • "High-capacity feeder (2000-sheet) symptoms" on page 2-5 • "Paper tray symptoms" on page 2-6 • "Duplex the user with information that explains a problem with a print cartridge, paper jam, option, port, and - Lexmark T642 | Service Manual - Page 42
press the Back button. Press the Menu button to open the menu index. Note: The printer must be in the Ready state to access the menu index. A message indicating the menus are unavailable will appear a link, submitting a configuration item, or when you want to start or cancel a job. 2-2 Service Manual - Lexmark T642 | Service Manual - Page 43
panel shows messages and graphics describing the current state of the printer and indicating possible printer problems you must resolve. The top line of the display is Utilities Menu PDF Menu PostScript Menu PCL Menu HTML Menu Image Menu Network/Ports IPv6 TCP/IP Standard Network Network - Lexmark T642 | Service Manual - Page 44
the base printer by Cartridge, Prebate Violation, or Missing Cartridge. 11. Ready appears on the display. 12. The main fan turns on. 13. The main drive motor turns on. 14. The developer drive assembly drives the developer shaft in the toner cartridge. 15. The exit rollers turn. 2-4 Service Manual - Lexmark T642 | Service Manual - Page 45
" on page 2-122. High-capacity feeder (2000-sheet) symptoms Symptom The printer does not recognize the highcapacity feeder installed. Paper feed problem with the high-capacity feeder. Action Go to "High-capacity feeder input tray service check" on page 2-95. Go to "High-capacity feeder input tray - Lexmark T642 | Service Manual - Page 46
option symptoms Symptom Paper feed problem with Duplex. Paper jams at Paper Removal Tray. Paper skews in the Duplex Option. Paper fails to pass from lower option through the Duplex Option. Action Go to "Duplex option service check" on page 2-82. Go to "Duplex option service check" on page 2-82. Go - Lexmark T642 | Service Manual - Page 47
finisher Symptom Action Finisher does not staple. Go to "StapleSmart finisher service check" on page 2-123. Printer does not recognize StapleSmart Finisher Option as being installed. Go to "StapleSmart finisher service check" on page 2-123. Close Top Cover displayed. Unable to clear - Lexmark T642 | Service Manual - Page 48
page 4-76. Paperport link driver error These errors indicate an service check" on page 2-112. Problem with transfer- transfer servo start error. • Check HVPS • Check system board • Check HVPS/input sensor/toner sensor cable. Go to "Transfer roll service check" on page 2-128. 2-8 Service Manual - Lexmark T642 | Service Manual - Page 49
. • Incorrect hot roll. Action Go to "920.xx-Cold fuser service check" on page 2-87. Go to "920.xx-Cold fuser service check" on page 2-87. Go to "920.xx-Cold fuser service check" on page 2-87. Go to "920.xx-Cold fuser service check" on page 2-87. Go to "920.xx-Cold fuser - Lexmark T642 | Service Manual - Page 50
to "920.xx-Cold fuser service check" on page 2-87. Go to "920.xx-Cold fuser service check" on page 2-87. Go to "920.xx-Cold fuser service check" on page 2-87. Go to "920.xx-Cold fuser service check" on page 2-87. Go to "920.xx-Cold fuser service check" on page 2-87. 2-10 Service Manual - Lexmark T642 | Service Manual - Page 51
. • Incorrect hot roll. Action Go to "920.xx-Cold fuser service check" on page 2-87. Go to "920.xx-Cold fuser service check" on page 2-87. Go to "920.xx-Cold fuser service check" on page 2-87. Go to "920.xx-Cold fuser service check" on page 2-87. Go to "920.xx-Cold fuser - Lexmark T642 | Service Manual - Page 52
to "920.xx-Cold fuser service check" on page 2-87. Go to "920.xx-Cold fuser service check" on page 2-87. Go to "920.xx-Cold fuser service check" on page 2-87. Go to "920.xx-Cold fuser service check" on page 2-87. Go to "920.xx-Cold fuser service check" on page 2-87. 2-12 Service Manual - Lexmark T642 | Service Manual - Page 53
. • Incorrect hot roll. Action Go to "920.xx-Cold fuser service check" on page 2-87. Go to "920.xx-Cold fuser service check" on page 2-87. Go to "920.xx-Cold fuser service check" on page 2-87. Go to "920.xx-Cold fuser service check" on page 2-87. Go to "920.xx-Cold fuser - Lexmark T642 | Service Manual - Page 54
to "920.xx-Cold fuser service check" on page 2-87. Go to "920.xx-Cold fuser service check" on page 2-87. Go to "920.xx-Cold fuser service check" on page 2-87. Go to "920.xx-Cold fuser service check" on page 2-87. Go to "920.xx-Cold fuser service check" on page 2-87. 2-14 Service Manual - Lexmark T642 | Service Manual - Page 55
supply line voltage. Action Go to "920.xx-Cold fuser service check" on page 2-87. Go to "920.xx-Cold fuser service check" on page 2-87. Go to "920.xx-Cold fuser service check" on page 2-87. Go to "920.xx-Cold fuser service check" on page 2-87. Go to "920.xx-Cold fuser - Lexmark T642 | Service Manual - Page 56
4061-xx0 Service error codes (9xx.xx) (continued) Error code Sub codes Display text Description 922 .03 922 .04 922 .06 922 .07 922 .12 922 .13 922 . check" on page 2-89. Go to "922.xx-Cold fuser check" on page 2-89. Go to "922.xx-Cold fuser check" on page 2-89. 2-16 Service Manual - Lexmark T642 | Service Manual - Page 57
4061-xx0 Service error codes (9xx.xx) (continued) Error code Sub codes Display text Description 922 .16 922 .17 922 .22 922 .23 922 .24 922 .25 922 . - Lexmark T642 | Service Manual - Page 58
4061-xx0 Service error codes (9xx.xx) (continued) Error code Sub codes Display text Description 922 .32 922 .33 922 .34 922 .35 922 .36 922 .37 922 . check" on page 2-89. Go to "922.xx-Cold fuser check" on page 2-89. Go to "922.xx-Cold fuser check" on page 2-89. 2-18 Service Manual - Lexmark T642 | Service Manual - Page 59
4061-xx0 Service error codes (9xx.xx) (continued) Error code Sub codes Display text Description 922 .44 922 .45 922 .46 922 .47 922 .52 922 .53 922 . - Lexmark T642 | Service Manual - Page 60
4061-xx0 Service error codes (9xx.xx) (continued) Error code Sub codes Display text Description 922 .56 922 .57 922 .92 922 .93 922 .94 922 .95 922 . check" on page 2-89. Go to "922.xx-Cold fuser check" on page 2-89. Go to "922.xx-Cold fuser check" on page 2-89. 2-20 Service Manual - Lexmark T642 | Service Manual - Page 61
thermistor actually open. Action Go to "923.xx-Hot fuser service check" on page 2-90. Go to "923.xx-Hot fuser service check" on page 2-90. Go to "923.xx-Hot fuser service check" on page 2-90. Go to "923.xx-Hot fuser service check" on page 2-90. Go to "923.xx-Hot fuser - Lexmark T642 | Service Manual - Page 62
machine after receiving a 925.01. • 115 V lamp in 220 V printer. • Lamp has excessive wattage. Action Go to "924.xx-Hot fuser service check" on page 2-91. Go to "924.xx-Hot fuser service check" on page 2-91. Go to "924.xx-Hot fuser service check" on page 2-91. Go to "925.xx-Hot fuser - Lexmark T642 | Service Manual - Page 63
stopped at 500,000 to preserve data. • 115 V lamp in 220 V printer. • Lamp has excessive wattage. Too hot to do lamp detection and NVRAM problem. Action Go to "925.xx-Hot fuser service check" on page 2-91. Go to "925.xx-Hot fuser service check" on page 2-91. Go to "925.xx-Hot fuser service check - Lexmark T642 | Service Manual - Page 64
-a problem has been detected with the toner sensor. • Check the toner sensor • Check cable • Check system board An error has been detected. No home windows has been detected. • Check toner cartridge. • Check toner sensor No toner sensor transition. • Check toner sensor • Check toner cartridge - Lexmark T642 | Service Manual - Page 65
• Defective motor • Paper jams Action Go to "Printhead service check" on page 2-122. Go to "Main drive service check" on page 2-105. Go to "Main drive service check" on page 2-105. Go to "Main drive service check" on page 2-105. Go to "Main drive service check" on page 2-105. Go to "Main drive - Lexmark T642 | Service Manual - Page 66
.80 939 .00 Driver over temperature detection. service check" on page 2-105. Go to "Main drive service check" on page 2-105. Go to "Main drive service check" on page 2-105. Go to "Main drive service check" on page 2-105. Go to"Main drive service check" on page 2-105. POR the printer Service Manual - Lexmark T642 | Service Manual - Page 67
Service error codes (9xx.xx) (continued) Error code Sub codes Display text 949 . and remove components listed above as a method of troubleshooting components. Once a component has been installed in a printer, it can not be used in another printer. It must be returned to the manufacturer. Perform - Lexmark T642 | Service Manual - Page 68
one or the printer will be rendered inoperable. Warning: Never install and remove components listed above as a method of troubleshooting components. Once a component has been installed in a printer, it can not be used in another printer. It must be returned to the manufacturer. 2-28 Service Manual - Lexmark T642 | Service Manual - Page 69
4061-xx0 Service error codes (9xx.xx) (continued) Error code Sub codes Display text and remove components listed above as a method of troubleshooting components. Once a component has been installed in a printer, it can not be used in another printer. It must be returned to the manufacturer. - Lexmark T642 | Service Manual - Page 70
device is unable to identify the exact component failure. The specified device has detected an equipment check in its system card. Service errors 980 thru 984 can be one of the following: system board, duplex, tray x (1, 2, 3, 4, or 5), envelope feeder or output bin. 2-30 Service Manual - Lexmark T642 | Service Manual - Page 71
printer to the Ready state. User status displays Error code Sub code Display text Toner Low Tray x Missing Tray x Empty Tray x Low Description/action If the toner cartridge is low, then Toner Low displays. The Toner , go to "Parallel port service check" on page 2-116. If Tray 2 through - Lexmark T642 | Service Manual - Page 72
toner cartridge and install a new cartridge. • Press and hold and press and cartridge code. to display debug data for the engine Note: This message may help diagnose a potential printer problem 9 Envelope, 10 Envelope, DL Envelope, C5 Envelope, B5 Envelope, or other Envelope. 2-32 Service Manual - Lexmark T642 | Service Manual - Page 73
in Diagnostics Mode or running diagnostics. • If the device is experiencing a hardware problem, turn the printer off and on. If the message continues to be displayed, go to "Duplex option service check" on page 2-82. Tray x=Tray 2, Tray 3, Tray 4, or Tray 5 This messages displays for the following - Lexmark T642 | Service Manual - Page 74
. The following actions can be taken: • Install the stapler cartridge. • Press to clear the message. The printer handles stapled jobs as if the staple cartridge were installed, but empty. The Staples Empty message appears on the status line and the Load Staples may display. 2-34 Service Manual - Lexmark T642 | Service Manual - Page 75
- Reset Active Bin If the message cannot be cleared, go to "Input tray(s) service check" on page 2-102. This message is displayed when a duplex option has been hot unplugged. The printer requires the reinstallation of the option to print a page which has been formatted by the interpreter before - Lexmark T642 | Service Manual - Page 76
. This message not only notifies the user that a specific error interfered with the priming, but allows the user to request the process begin again. The following actions are available: • Press to restart the priming operation. • Press or to cancel the priming operation. 2-36 Service Manual - Lexmark T642 | Service Manual - Page 77
is in Diagnostics Mode or running diagnostics. • If the device is experiencing a hardware problem, turn the printer off and on. If the message continues to be displayed, go to "Input tray(s) service check" on page 2-102. This messages displays for the following conditions: • The feeder may have - Lexmark T642 | Service Manual - Page 78
are allowed to print, then they are not reprinted once a good print cartridge is inserted. If this does not fix the problem, go to "Signature button assembly service check" on page 2-122. 34 .xx Short Paper The printer determines the paper length is too short to print the formatted data. This - Lexmark T642 | Service Manual - Page 79
displays when the printer detects a defective flash. This error may occur at power on, or during flash format and write operations. Press to clear the message. The flash is marked as bad and normal operation continues. Flash operations are not allowed until the problem is resolved. Diagnostic - Lexmark T642 | Service Manual - Page 80
Network Software Error 54 .xx Network printer is reset. The following actions may be taken: • Press to clear the message. The printer discards any data received on the USB port. • Press until Busy/Waiting appears. The following are available: - Reset Printer - Reset Active Bin 2-40 Service Manual - Lexmark T642 | Service Manual - Page 81
Some configuration changes that may cause this condition are: • Code version change • Paper handling option is removed • Disk has been moved to a different model printer. Press to clear the message. Some of the Print and Hold jobs stored on the disk will not be restored. They remain on the disk, - Lexmark T642 | Service Manual - Page 82
.88 .xx Toner Low This message displays when toner low occurs and the toner low alarm is printer code. This message automatically clears in 30 seconds, and the IPDS emulation is disabled. No other printer functions are affected. The correct IPDS emulation must be downloaded. 2-42 Service Manual - Lexmark T642 | Service Manual - Page 83
3. Network card problem, turn the printer off and back on. If the error occurs again, the user is advised to turn the printer off, remove the option, and call for service. User status message Explanation Turn Printer OFF to Enable Option Insert Duplex Front Cover Close Duplex Rear Door A printer - Lexmark T642 | Service Manual - Page 84
printer operator panel. If you select Show Areas on the operator panel, you can view one or more images to help you clear the jam. 23 Paper Jam, 3 pages jammed Continue Show Areas Show Areas Show Duplex Show Rear Door Show Finisher 1. Open manual the problem, go to "Input sensor service check" - Lexmark T642 | Service Manual - Page 85
Did not receive proper motor feedback to start laser servo. Motor connections Printhead motor not locked service check" on page 2-105. Go to "Cover closed switch/ cable service check" on page 2-80. • Check fuser entry guide for toner build up. • Check fuser for wear or contamination. If problem - Lexmark T642 | Service Manual - Page 86
mode, select PRINTER SETUP and Engine Setting 3. • The fuser narrow media sensor may not be operating properly. Go to "Fuser narrow media sensor service check" on page 2-93. • Check fuser entry guide for toner build up. • Check fuser for wear or contamination. If a problem is found, replace - Lexmark T642 | Service Manual - Page 87
mode, select PRINTER SETUP and Engine Setting 3. • The fuser narrow media sensor may not be operating properly. Go to "Fuser narrow media sensor service check" on page 2-93. • Check fuser entry guide for toner build up. • Check fuser for wear or contamination. If a problem is found, replace - Lexmark T642 | Service Manual - Page 88
mode, select PRINTER SETUP and Engine Setting 3. • The fuser narrow media sensor may not be functioning properly. Go to "Fuser narrow media sensor service check" on page 2-93. • Check the fuser entry guide for toner build up. • Check fuser for wear or contamination. If a problem is found, replace - Lexmark T642 | Service Manual - Page 89
mode, select PRINTER SETUP and Engine Setting 3. • The fuser narrow media sensor may not be functioning properly. Go to "Fuser narrow media sensor service check" on page 2-93. • Check fuser entry guide for toner build up. • Check the fuser for wear or contamination. If a problem is found, replace - Lexmark T642 | Service Manual - Page 90
mode, select PRINTER SETUP and Engine Setting 3. • The fuser narrow media sensor may not be functioning properly. Go to "Fuser narrow media sensor service check" on page 2-93. • Check the fuser entry guide for toner build up. • Check the fuser for wear or contamination. If a problem is found - Lexmark T642 | Service Manual - Page 91
mode, select PRINTER SETUP and Engine Setting 3. • The fuser narrow media sensor may not be functioning properly. Go to "Fuser narrow media sensor service check" on page 2-93. • Check the fuser entry guide for toner build up. • Check the fuser for wear or contamination. If a problem is found - Lexmark T642 | Service Manual - Page 92
the fuser entry guide for toner build up. • Check the fuser for wear or contamination. If a problem is found, replace PRINTER SETUP and Engine Setting 3. • The fuser narrow media sensor may not be functioning properly. Go to "Fuser narrow media sensor service check" on page 2-93. 2-52 Service Manual - Lexmark T642 | Service Manual - Page 93
option(s) that may be installed for correct installation and alignment. • The fuser exit sensor may not be functioning properly. Go to "Fuser exit sensor service check" on page 2-92. • Make sure the redrive door is complete closed. • Check the fuser for any signs of wear or contamination. If any - Lexmark T642 | Service Manual - Page 94
exit sensor may not be functioning properly. Go to "Fuser exit sensor service check" on page 2-92. Page is covering narrow media sensor during warm between 0 and 99,999. Exit sensor assembly. Go to "Fuser exit sensor service check" on page 2-92. Something is keeping the exit sensor in a covered - Lexmark T642 | Service Manual - Page 95
options(s) that may be installed for correct installation and alignment. • The fuser exit sensor may not be functioning properly. Go to "Fuser exit sensor service check" on page 2-92. • Make sure the redrive door is complete closed. • Check the fuser for any signs of wear or contamination. If any - Lexmark T642 | Service Manual - Page 96
bounced. Fuser page count between 100,000 and 199,999. Exit sensor assembly. Go to "Fuser exit sensor service check" on page 2-92. Page is covering exit sensor during warm up. Fuser page count between 100,000 assembly for any signs of debris or pieces of paper or media. 2-56 Service Manual - Lexmark T642 | Service Manual - Page 97
options(s) that may be installed for correct installation and alignment. • The fuser exit sensor may not be functioning properly. Go to "Fuser exit sensor service check" on page 2-92. • Make sure the redrive door is complete closed. • Check the fuser for any signs of wear or contamination. If any - Lexmark T642 | Service Manual - Page 98
Fuser page count between 200,000 and 299,999. • If page is not visible from front or rear of the printer, a partial piece of page may be torn off in the fuser covering the narrow media sensor. • The narrow the fuser assembly for any signs of debris or pieces of paper or media. 2-58 Service Manual - Lexmark T642 | Service Manual - Page 99
options(s) that may be installed for correct installation and alignment. • The fuser exit sensor may not be functioning properly. Go to "Fuser exit sensor service check" on page 2-92. • Make sure the redrive door is complete closed. • Check the fuser for any signs of wear or contamination. If any - Lexmark T642 | Service Manual - Page 100
Fuser page count between 300,000 and 399,999. • If page is not visible from front or rear of the printer, a partial piece of a page may be torn off in the fuser covering the narrow media sensor. • The narrow fuser assembly for any signs of debris or pieces of paper or media. 2-60 Service Manual - Lexmark T642 | Service Manual - Page 101
options(s) that may be installed for correct installation and alignment. • The fuser exit sensor may not be functioning properly. Go to "Fuser exit sensor service check" on page 2-92. • Make sure the redrive door is complete closed. • Check the fuser for any signs of wear or contamination. If any - Lexmark T642 | Service Manual - Page 102
Fuser page count between 400,000 and 499,999. • If page is not visible from front or rear of the printer, a partial piece of a page may be torn off in the fuser covering the narrow media sensor. • The narrow fuser assembly for any signs of debris or pieces of paper or media. 2-62 Service Manual - Lexmark T642 | Service Manual - Page 103
options(s) that may be installed for correct installation and alignment. • The fuser exit sensor may not be functioning properly. Go to "Fuser exit sensor service check" on page 2-92. • Make sure the redrive door is complete closed. • Check the fuser for any signs of wear or contamination. If any - Lexmark T642 | Service Manual - Page 104
page count stopped at 500,000 to preserve data. • If page is not visible from front or rear of the printer, a partial piece of a page may be torn off in the fuser covering the narrow media sensor. • The narrow fuser assembly for any signs of debris or pieces of paper or media. 2-64 Service Manual - Lexmark T642 | Service Manual - Page 105
options(s) that may be installed for correct installation and alignment. • The fuser exit sensor may not be functioning properly. Go to "Fuser exit sensor service check" on page 2-92. • Make sure the redrive door is complete closed. • Check the fuser for any signs of wear or contamination. If any - Lexmark T642 | Service Manual - Page 106
during warm up. Fuser count is not available. • If page is not visible from front or rear of the printer, a partial piece of a page may be torn off in the fuser covering the narrow media sensor. • The narrow fuser assembly for any signs of debris or pieces of paper or media. 2-66 Service Manual - Lexmark T642 | Service Manual - Page 107
spring for any signs of damage, a loose spring, or binding parts. Repair the redrive as necessary. • Check duplex unit for correct installation and alignment to the printer. • If available, try another duplex unit. If none is available, go to "231.xx Jam displays on the operator panel" on page 2-83 - Lexmark T642 | Service Manual - Page 108
page 3-12. If the tests fail after several attempts, replace the duplex option. If the tests pass, retry to feed from the printer through the duplex option. If the problem is still present, replace the duplex option. • Make sure the duplex jam access tray is installed correctly • Make sure the power - Lexmark T642 | Service Manual - Page 109
and Continue selected. • Sensor is having mechanical or electrical problems. 238 .05 Duplex doublefeed sensor covered. • Media left in the duplex and Continue selected. • Sensor is having mechanical or electrical problems. 238 .06 Duplex doublefeed and exit sensors covered. • Media left in the - Lexmark T642 | Service Manual - Page 110
the duplex option. Replace the duplex option. Replace the duplex option. Replace the duplex option. Replace the duplex option. Replace the duplex option. Check duplex sensor cables for correct installation. If no problem is found with the cables, replace the duplex option. 2-70 Service Manual - Lexmark T642 | Service Manual - Page 111
4061-xx0 User attendance messages-paper jams and paper handling errors (2xx.xx) Error code Sub codes Description 241 .10 Page was not properly picked from tray 1. 241 .11 Page was not properly picked from tray 1. 241 .12 Page was not properly picked from tray 1. Possible causes Action - Lexmark T642 | Service Manual - Page 112
on page 3-21. Review the following information before performing any service checks. • Paper feed problems (especially paper jams): Go to "Display Log" on page 3-23 and check the printer event log for indications voltages are incorrect, replace the failing autoconnect assembly. 2-72 Service Manual - Lexmark T642 | Service Manual - Page 113
0 V dc. If incorrect, replace the sensor assembly. If this does not fix the problem, replace the control board. 274.xx Paper Jam-Check Bin 4 displays Service tip: When a 274.xx Paper Jam Check Bin 4 message displays, a problem exists with the top pass thru sensor assembly or the control board. FRU - Lexmark T642 | Service Manual - Page 114
If the sensor flag is operating correctly, replace the bin x sensor. If this does not fix the problem, replace the control board. 271.xx Paper Jam - Check Bin 1 displays-paper does not feed into the control board. If correct, replace the mechanical linkage/ DC motor assembly. 2-74 Service Manual - Lexmark T642 | Service Manual - Page 115
.xx Error code service check FRU 1 Printer POR 2 System board 3 Factory defaults 4 Sub error codes Action Turn the printer off and on the "Base printer sub error codes" on page 2-9. If none of the Sub Error Codes are listed, then call your next level of support or call Lexmark. Diagnostic - Lexmark T642 | Service Manual - Page 116
to step 2. Check for any signs of blockage in the fan. If any is found, remove and retry the printer. If no problem is found, go to step 3. Replace the following FRUs in the order shown: • Cartridge fan. • System board. See "System board and inner shield removal" on page 4-76. 2-76 Service Manual - Lexmark T642 | Service Manual - Page 117
a method of troubleshooting components. Once a component has been installed in a printer, it can not be used in another printer. It must operator panel board has not been replaced, contact your next level of support. Replace the current interconnect card assembly with the original interconnect card - Lexmark T642 | Service Manual - Page 118
and remove components listed above as a method of troubleshooting components. Once a component has been installed in a printer, it can not be used in another printer. It must be returned to the manufacturer. Note: Before proceeding with this service check, make sure you have the correct system - Lexmark T642 | Service Manual - Page 119
If the problem remains, contact the next level of support. Charge roll service check Service tip: Close charge roll bearing and remove the roll from the printer. Leave the paper wrapped around the charge roll until the charge roll for correct installation, toner buildup, marks, cuts, or other signs - Lexmark T642 | Service Manual - Page 120
switch/cable service check FRU 1 Toner cartridge 2 Cover closed switch/cable assembly Action Make sure the toner cartridge is correctly installed and that the right and left cartridge tracks are not loose or broken. Make sure the cover closed switch activation tab on the toner cartridge is not - Lexmark T642 | Service Manual - Page 121
the ESD precautions and turn the printer off before any feature or option cards are removed or replaced. Remove one option/feature at a time to help isolate the printer off and disconnect each cable connected to the system board and each option installed on the system board until the problem is - Lexmark T642 | Service Manual - Page 122
, J10, J11, and J12. If no problem is found, replace the duplex option. Note: Before proceeding with the following service checks, verify the media used in the duplex option meets specification and is not dog-eared or damaged in any way. See "Media specifications" on page 1-8. 2-82 Service Manual - Lexmark T642 | Service Manual - Page 123
sheet of media is leaving the exit sensor in the fuser and feeding properly into the duplex option. Check the duplex link for correct operation and any signs of damage. If the problem is prior to the duplex input sensor and in the base machine, repair as necessary. If the jam occurs in the - Lexmark T642 | Service Manual - Page 124
envelope feeder is correctly installed and mated to the autoconnect at the front of the printer. Check the connector for signs of damage to the connector or contacts. If you find , replace the sensor assembly. If this does not fix the problem, replace the envelope system board. 2-84 Service Manual - Lexmark T642 | Service Manual - Page 125
to feed from the hopper Kick rolls are rotating. Check the deflector gap adjustment before continuing this service check. FRU 1 Deflector gap adjustment 2 Weight assembly 3 Envelope edge guide Action Check the deflector gap adjustment. The adjustment may be too narrow. Check the weight assembly to - Lexmark T642 | Service Manual - Page 126
printer paper path FRU 1 Latch lever Action Make sure the tip of the latch lever is centered in the opening in the floor of the paper path. The latch lever may not be detented on the latch. If no problem is found and the problem persists, replace the envelope feeder option. 2-86 Service Manual - Lexmark T642 | Service Manual - Page 127
of the printer where you are working. Unplug the printer before you begin, or use caution if the printer must receive power in order to perform the task. Service tip: Check the AC line voltage to make sure it is within operating specification. If incorrect, inform the customer; if correct, go to step - Lexmark T642 | Service Manual - Page 128
not seated or installed properly, reseat the cable and retry the printer. If the cable is installed correctly, replace the following FRUs in removal" on page 4-76. • LVPS to system board cable. If no problem is found up to this point, then replace the following in the order shown 2-88 Service Manual - Lexmark T642 | Service Manual - Page 129
printer where you are working. Unplug the printer before you begin, or use caution if the printer must receive power in order to perform the task. Service operating specification. problems are found, replace the fuser top cover assembly."Fuser narrow media sensor removal" on page 4-34. If no problem - Lexmark T642 | Service Manual - Page 130
around the thermistor for any signs of excessive heat. If a problem is found, replace the thermistor. If no problem is found, go to step 2. Turn the printer off and disconnect the fuser to system board cable from J10 . See "System board and inner shield removal" on page 4-76. 2-90 Service Manual - Lexmark T642 | Service Manual - Page 131
failure. CAUTION: .The fuser may be hot, use caution before removing or servicing. CAUTION: There is a danger from hazardous voltage in the area of the printer where you are working. Unplug the printer before you begin, or use caution if the printer must receive power in order to perform the task - Lexmark T642 | Service Manual - Page 132
. With the redrive assembly removed from the printer, enter the Diagnostics mode and run the problem is found, check the fuser for any signs of media in the fuser or any signs of toner or other contamination. If a problem is found, clean or remove the debris or contamination. 2-92 Service Manual - Lexmark T642 | Service Manual - Page 133
narrow media sensor service check If any of the following error codes are displayed, a problem may exist in the area of the narrow media sensor assembly: 201.04, 201.14, 201.24, 201.34, 201.44, 201.54, and 201.94. Fuser exit and fuser narrow media sensor status check Printer not printing - Lexmark T642 | Service Manual - Page 134
printer where you are working. Unplug the printer before you begin, or use caution if the printer must receive power in order to perform the task. Service tip: Try changing the envelope enhance level setting. A different setting may correct the problem the problem, problems were found in steps 1 through - Lexmark T642 | Service Manual - Page 135
checks must be made with the highcapacity feeder attached to the base printer to obtain accurate results. Service tip: Be sure the paper size switch is set to the correct paper size setting and the rear paper guides are in the correct locations for the size of paper installed in the high-capacity - Lexmark T642 | Service Manual - Page 136
voltage measures +24 V dc. If incorrect, check the autoconnect system for any problems. +24 V dc must come from the base printer through the autoconnect system to the high-capacity input for the high-capacity feeder to , replace the switch. If correct, replace the switch cable. 2-96 Service Manual - Lexmark T642 | Service Manual - Page 137
feeder input tray does not reach the pass thru sensor Service tip: Be sure the paper in tray is within specifications. FRU 1 Autocompensator assembly 2 Wear strips Action Check the autocompensator pick arm rollers for sign of glazing, toner or other buildup. Replace as necessary. Check the wear - Lexmark T642 | Service Manual - Page 138
not move up or down; the printer recognizes that the option is installed FRU short between each pin and the motor housing. If a problem is found, replace the motor assembly. If no problem is found, measure the resistance between the following pins on , replace the system board. 2-98 Service Manual - Lexmark T642 | Service Manual - Page 139
4061-xx0 Paper size switch not selecting paper size that is selected FRU 1 Paper size switch High-capacity feeder option control board Action Check for continuity between the common pin (J5-1) and the pin of the paper size selected. Pin Color Paper size J5-1 Black Common lead J5-2 Blue B5 - Lexmark T642 | Service Manual - Page 140
screw pulleys. High-capacity output stacker service check Service tip: The majority of the mechanical is configured correctly before attempting to service the high-capacity output stacker option at J6 for the upper and lower units. Problems with excessive static electricity buildup FRU 1 Front - Lexmark T642 | Service Manual - Page 141
bin even though bin x is selected and paper exits half way out of the redrive assembly Service tip: For this type of problem check the "Base printer sub error codes" on page 2-9. They can help isolate the problem. A 202 paper jam message can also occur prior to the high-capacity output stacker pass - Lexmark T642 | Service Manual - Page 142
not fix the problem, replace the highcapacity output stacker option. Input sensor service check Service tip: Run the manually moved in and out of the sensor. FRU 1 Input sensor flag 2 System board 3 Input sensor cable Action Check the input sensor flag for damage and proper operation. If a problem - Lexmark T642 | Service Manual - Page 143
the pass thru sensor. Remove any jammed sheets of paper from the printer and check the pass thru sensor and flag for proper operation by running on the system board. If no problem is found, replace the paper low sensor assembly. If this does not correct the problem, replace the option system board. - Lexmark T642 | Service Manual - Page 144
or the printer will be rendered inoperable. Warning: Never install and remove components listed above as a method of troubleshooting components. Once a component has been installed in a printer, it can not be used in another printer. It must be returned to the manufacturer. 2-104 Service Manual - Lexmark T642 | Service Manual - Page 145
the noise is in the main drive, toner cartridge, fuser, or main drive gearbox. Look for drive gearbox, or fuser. Repair as necessary. A service error code 936 - Transport Motor may be displayed. the system board. If this does not fix the problem, replace the main drive motor. Check the continuity - Lexmark T642 | Service Manual - Page 146
troubleshooting components. Once a component has been installed in a printer, it can not be used in another printer. It must be returned to the manufacturer. Before continuing with this service buttons removal" on page 4-67. If the problem remains, replace the operator panel board (see Service Manual - Lexmark T642 | Service Manual - Page 147
4061-xx0 Operator panel display Service tip: The printer has detected a problem with the system board, the operator panel cable (part of the upper front cover hinge assembly), or the operator panel board if POST does not complete, the printer emits 5 beeps, and stops in a continuous pattern until - Lexmark T642 | Service Manual - Page 148
is correctly installed and not broken or damaged. If the test fails, replace the SDRAM card. If the problem continues, replace the controller board. Hard Disk Option Service tip: These printers support one hard disk option. Make sure only one hard disk option is installed. Make sure the fixed disk - Lexmark T642 | Service Manual - Page 149
3. Select Sensor Tests. 4. Select Standard Bin. 5. Check the sensor and flag for proper operation. If you find no problem with the sensor and flag, continue with the service check. Service tip: Be sure the flag is correctly installed. The output bin sensor is a normally closed sensor with the sensor - Lexmark T642 | Service Manual - Page 150
Service tip: If more than a single output expander option is installed, check each one to see if the printer recognizes any single option as being installed. If the printer recognizes any of the output expander options then the base printer autoconnect system is operating correctly and the problem - Lexmark T642 | Service Manual - Page 151
If incorrect, replace the sensor assembly. If this does not fix the problem, replace the output expander option. 271.xx Paper jam - Check Bin ) F = Full (Lower part of sensor assembly) P = Pass Thru Sensor 990 Service - Bin x If displayed, replace the output expander option. No indication that bin - Lexmark T642 | Service Manual - Page 152
the natural curvature in the paper. Reinstall the paper in the correct manner. If the problem persists, it may be necessary to reduce the stack height. Replace both pick rolls if the the autocompensator arm assembly. If you find a problem, replace the autocompensator assembly. 2-112 Service Manual - Lexmark T642 | Service Manual - Page 153
the pick roll or slick spots. If you find a problem, replace the pick roll assembly. Check to ensure the media that is being fed through the multipurpose tray assembly meets recommended paper specifications. Paper size sensing service check Before proceeding, check for the correct paper size loaded - Lexmark T642 | Service Manual - Page 154
card/ autocompensator cable 3 System board If a problem is found, repair or replace the tray assembly. If no problem is found, go to step 2. Check for correct printer. Check the continuity between J26-2 on the system board and ground. It should measure approximately 0 ohms. 2-114 Service Manual - Lexmark T642 | Service Manual - Page 155
. If no problem is found, go to step 2. Make sure the switch activate spring is not bent or broken. Replace the spring if damaged. If the spring is not damaged, go to step 3. Set the tray for the paper size that is not recognized and install the tray in the printer. Select - Lexmark T642 | Service Manual - Page 156
controller board. Print quality service check Service tip: Before troubleshooting any print quality problems do the following: • Install another print cartridge if available before proceeding with the service checks. • Use Tray 1 to test for print quality of the base printer. • Replace the charge - Lexmark T642 | Service Manual - Page 157
assembly Action Check the print cartridge for damage, especially the PC drum contact on the cartridge. Check the PC drum printer does not have a mechanical shutter as previous laser printers. The printer is interlocked through the front top cover interlock switch. Print quality-random marks Service - Lexmark T642 | Service Manual - Page 158
. Print quality-background Service tip: Some background problems can be caused by rough papers, non-Lexmark toner cartridges or if the media texture is set to the rough setting. Some slick or coated papers may also cause background problems. Some problems occur with printers that run a large - Lexmark T642 | Service Manual - Page 159
from J15 to printer ground. Pin J15 Voltage (approximate) Printer idle J15-1 0 V dc J15-2 +4 V dc J15-4 0 V dc Printer printing J15-1 0 this does not correct the problem, replace the HVPS. Print quality-banding Service tip: Banding is difficult cartridge. Diagnostic information 2-119 - Lexmark T642 | Service Manual - Page 160
image can be caused by the photoconductor, cleaning blade, and other parts inside the print cartridge. FRU 1 Hot roll fuser assembly Action Check the fuser assembly for toner contamination. The hot roll especially might cause toner to be retained and deposited on the page. 2-120 Service Manual - Lexmark T642 | Service Manual - Page 161
Service tip: This is generally caused by loose toner in the machine in the paper path being carried through the printer on the backside of the paper. FRU 1 Hot roll fuser assembly 2 Transfer roll transfer plate assembly Action Toner is being carried out on the backside of the media. This problem - Lexmark T642 | Service Manual - Page 162
problem Lexmark T64x print cartridge is correctly installed in the printer. The cartridge is easily identified by the contact board on the right side rear of the cartridge. Install another print cartridge before attempting to troubleshoot the printer cartridge contact assembly. 2-122 Service Manual - Lexmark T642 | Service Manual - Page 163
service check Note: When removing the stapler mechanism from the option, first remove the staple supply cartridge. Note: When replacing staples in the supply cartridge, discard any old staples in the cartridge, and replace with a fresh strip. Problems the voltages at the printer top autoconnect. If - Lexmark T642 | Service Manual - Page 164
even if finisher is selected Note: When a 900.xx Service Error is displayed during POST, the failure is usually in the stapler gearbox assembly or stapler cartridge. Replace the stapler option. 281.xx Paper Jam-The Action Check the stapler assembly for broken or damaged parts. 2-124 Service Manual - Lexmark T642 | Service Manual - Page 165
2 Stapler to stapler board (J3) cable Action Before proceeding with the service check, gently try to remove the stapler cartridge holder from the stapler assembly. If the holder is jammed in the stapler assembly: 1. Turn the printer off, and remove the right side cover. Use care when removing the - Lexmark T642 | Service Manual - Page 166
problem printer will be rendered inoperable. Warning: Never install and remove components listed above as a method of troubleshooting components. Once a component has been installed in a printer, it can not be used in another printer. It must be returned to the manufacturer. 2-126 Service Manual - Lexmark T642 | Service Manual - Page 167
is intended to be used when a 929.xx Service Error displays. FRU 1 Developer drive assembly 2 Front harness cable 3 Toner sensor Action Incorrect operation of the developer drive assembly can cause the printer to display a 929.xx error code (Toner Sensor). Check the developer drive assembly for - Lexmark T642 | Service Manual - Page 168
problems such as lines that are spaced 51.02 mm apart indicate you should check the transfer roll for damage and check for toner or foreign material buildup. Service dc with the printer idle to 0 V dc when the printer runs the print problem continues, replace the system board. 2-128 Service Manual - Lexmark T642 | Service Manual - Page 169
that can be accessed during POR to identify problems with the printer. Diagnostics Mode 1. Turn off the printer. 2. Press and hold and . The Diagnostics Mode group contains the settings and operations used while manufacturing and servicing the printer. See "Diagnostics mode" on page 3-2 for more - Lexmark T642 | Service Manual - Page 170
Diagnostics mode Entering Diagnostics mode 1. Press and hold and . 2. Turn on the printer. 3. Release the buttons when Performing Self Test displays. Available tests The tests display Test" on page 3-7 See "Parallel Wrap tests" on page 3-8 See "Serial Wrap tests" on page 3-9 3-2 Service Manual - Lexmark T642 | Service Manual - Page 171
) FINISHER TESTS (if installed) Staple Test Feed Tests Sensor Test BASE SENSOR TEST Toner Input Output DEVICE TESTS Quick Disk Test (if installed) Disk Test/Clean (if installed) Flash Test (if installed) PRINTER SETUP Defaults Page Count Perm Page Count Serial Number Envelope Enhance Engine Setting - Lexmark T642 | Service Manual - Page 172
24 Exiting Diagnostics mode Select Exit Diagnostics to exit the Diagnostics mode. Resetting the Printer displays, the printer performs a POR, and returns to normal mode. REGISTRATION Print registration makes sure determine the changes you need to make to the margins settings. 3-4 Service Manual - Lexmark T642 | Service Manual - Page 173
the following information: • Print registration settings • Alignment diamonds at the top and bottom • Horizontal lines to check for skew • General printer information, including current page count, installed memory, serial number, and code level. To print the Quick Test page: Note: Print the - Lexmark T642 | Service Manual - Page 174
of the EVENT LOG from DIAGNOSTICS. • Configuration information, including printer serial number, controller code level, engine code level, operator panel code level, font versions, and cartridge information. • Default values for the QUALITY MENU settings used to print the pages. 3-6 Service Manual - Lexmark T642 | Service Manual - Page 175
Test: 1. Select DRAM Test from the menu. The message DRAM Test Testing... displays. Then the message Resetting Printer appears, and the power indicator light blinks red. 2. Turn the printer off and on. While the DRAM test executes, the power indicator blinks green. The following type of message - Lexmark T642 | Service Manual - Page 176
approximately three seconds, and the failure count increases by one. The test continues until all of the printer processor's cache has been tested. Once the maximum pass count or fail count is reached, the final results display. To stop the test before completion, press Stop ( ). 3-8 Service Manual - Lexmark T642 | Service Manual - Page 177
TESTS. 2. Select Single or Continuous. • The single Duplex Quick test cannot be canceled. • The printer attempts to print the Quick Test Page from the default paper source. If the default paper source only supports envelopes, then the page is printed from Tray 1. • Check the Quick Test Page for - Lexmark T642 | Service Manual - Page 178
Sensor Test Testing displays. 2. Manually actuate each of the duplex sensors. When the sensor/switch is closed, CL (closed) displays, and when the sensor/switch is open, OP (open) displays. • Duplex input sensor • Duplex exit sensor 3. Press Back ( ) or Stop ( ) to exit the test. 3-10 Service Manual - Lexmark T642 | Service Manual - Page 179
3E inclusively (hex) • CC = in the range of 35 through 51 inclusively (hex) • DD = in the range of 0C through 13 inclusively (hex) For the duplex drive system to pass the test, the following results must display: • AA = 00 • BB = in the range of 29 through 3F inclusively (hex) • CC = in - Lexmark T642 | Service Manual - Page 180
... displays. The message Duplex Feed 2 Clear Paper displays when the paper reaches the duplex paper stop position 2, and the power indicator turns on solid. 2. Remove the media from the duplex unit, and clear the message on the operator panel by pressing Back ( ) or Stop ( ). 3-12 Service Manual - Lexmark T642 | Service Manual - Page 181
servicer observe the paper path as media is feeding through the printer. A blank sheet of paper feeds through the printer as the laser the table below: Tray sensor support by source Source Tray 1 Tray 4. Once this message displays, the servicer can manually actuate each sensor. The tray empty - Lexmark T642 | Service Manual - Page 182
tests to verify that media can be fed to a specific output bin. Media is fed from the default input source size or envelope supported by the printer. Note: If the Configure Bins printer setting is Link rather than Mailbox, the printer selects its own to return to OUTPUT BIN TESTS. 3-14 Service Manual - Lexmark T642 | Service Manual - Page 183
=Open • Full-Bin full sensor • NearFull-Bin near full sensor 4. Manually actuate the bin sensor by moving the flag in and out of the thru sensor • Full-Bin full sensor • NearFull-Bin near full sensor 3. Manually actuate each of the output expander sensors, and the display by each sensor toggles - Lexmark T642 | Service Manual - Page 184
(lower part of dual sensor) • NearFull-High-capacity bin near full sensor (upper part of dual sensor) 3. Manually actuate each of the sensors of the high-capacity stacker, and the display by each sensor toggles from Open to from the OUTPUT BIN TESTS. The test runs once and stops. 3-16 Service Manual - Lexmark T642 | Service Manual - Page 185
Note: This test can be run using any of the paper sizes supported by the printer. To run the Feed Test, select Feed Tests from FINISHER TESTS. the individual sensors that can be manually actuated, and the display shows Open or Closed. • Staple Sensors Cartridge Present sensor Staple Low sensor Self - Lexmark T642 | Service Manual - Page 186
is used to determine if the sensors located inside the printer are working correctly. To run the Base Sensor Test: -Output (exit) sensor • Toner Level-Toner level sensor (remove the cartridge and replace to actuate the sensor) 2. Manually actuate the sensors to verify Tests menu. 3-18 Service Manual - Lexmark T642 | Service Manual - Page 187
. Warning: This test destroys all data on the flash because the flash is unformatted at the end of the test. To reformat the flash, the servicer or the user must use FORMAT FLASH from the UTILITIES MENU. To run the Flash Test: 1. Select Flash Test from DEVICE TESTS. The message Files - Lexmark T642 | Service Manual - Page 188
Low, Medium, or High. The default is Medium. 3. Press Back ( ) to return to PRINTER SETUP. Engine Setting 1 through 4 Warning: Do not change these settings unless requested to do so by your next level of support. Model Name The model name can only be viewed and cannot be changed. 3-20 Service Manual - Lexmark T642 | Service Manual - Page 189
that cannot be determined using hardware sensors. The configuration IDs are originally set at the factory when the printer is manufactured, however the servicer may need to reset Configuration ID 1 or Configuration ID 2 whenever you replace the system board. The IDs consist of eight hexadecimal - Lexmark T642 | Service Manual - Page 190
printer setting listed in EP SETUP to its factory default value. Sometimes this is used to help correct print quality problems problems with paper curl on low grade papers and problems PRINTER SETUP. Warm Up Time You can change the amount of time the printer output bin stacking problems. However, - Lexmark T642 | Service Manual - Page 191
from DIAGNOSTICS includes: • Detailed printer information, including code versions • Time and date stamps • Page counts for most errors • Additional debug information in some cases The printed event log can be faxed to Lexmark or your next level of support for verification or diagnosis. Diagnostic - Lexmark T642 | Service Manual - Page 192
selected, Deleting EVENT LOG displays on the screen. Press Back ( ) to return to EVENT LOG. EXIT DIAGNOSTICS This selection exits Diagnostics mode, and Resetting the Printer displays. The printer performs a POR, and the printer returns to normal mode. 3-24 Service Manual - Lexmark T642 | Service Manual - Page 193
27 See "Panel Menus" on page 3-27 See "PPDS Emulation" on page 3-27 See "Download Emuls" on page 3-27 See "Demo Mode" on page 3-27 See "Factory Defaults" on duplex page by two. At 300,000, the customer is reminded that the printer requires scheduled maintenance. This counter is reset by the servicer - Lexmark T642 | Service Manual - Page 194
After scheduled maintenance, the servicer needs to reset the page returns to the Printer Setup Reset Maintenance and the print cartridge lockout is bypassed . • Printer configuration information: Printer serial number is blank. If duplex is turned on, the pages are duplexed. The Print Quality Test - Lexmark T642 | Service Manual - Page 195
are also changed: • SmartSwitch settings for each port are turned off. • The printer language is changed to PPDS Emulation. Users can still switch languages on the operator panel and through the PJL data stream. Download Emuls Demo Mode There is a built-in demonstration mode. The settings allow you - Lexmark T642 | Service Manual - Page 196
Power Saver feature cannot be disabled. EVENT LOG The event log provides a history of printer errors. debug information or secondary codes for 900 service errors. However, the event log printed from when specific envelope size is out. The selections are Auto (default), MP Feeder, and Manual Env - Lexmark T642 | Service Manual - Page 197
is between 1 and 10, and the default value is 5. Exit Config Menu Press to exit the CONFIG MENU. The message Resetting the Printer displays, and the printer performs a POR and restarts in normal mode. Additional useful menu locations User menus are available from the Ready state by pressing Menu - Lexmark T642 | Service Manual - Page 198
the operator panel menus and their values. • A list of the installed options and features such as RAM memory cards, optional input paper trays, envelope feeder, duplex option, output bins, flash, or disk. • Printer information such as serial number, page count, installed RAM, engine code level, RIP - Lexmark T642 | Service Manual - Page 199
phenomena. This spring is not to be considered an adjustment for feeding problems unless it is obvious that the pick arm cannot fall all the way or sticky near the bottom of the tray, these springs may be the problem. Reducing the tension on the counterbalance spring may be used as a temporary - Lexmark T642 | Service Manual - Page 200
is automatically made when the option is installed below the printer. The paper input sensor is located in the rear of the duplex option under the input paper guide. The paper exit sensor is located on the left status, sensor status, motor status, and so on to the base printer. 3-32 Service Manual - Lexmark T642 | Service Manual - Page 201
type of print quality problem exists, see the Troubleshooting chapter in the User's Guide on the publications CD. Problem Print is too light. Toner smears or print comes off the page. Action • The toner may be low. To utilize the remaining toner, remove the cartridge by gripping the handles - Lexmark T642 | Service Manual - Page 202
xx0 Problem Toner fog or background shading appears on the page. Action • Check the print cartridge to make sure it is installed correctly. • The Toner Darkness setting may be too dark. Change the Toner Darkness setting in the Quality Menu. • Replace the charge rolls. • Replace the print cartridge - Lexmark T642 | Service Manual - Page 203
settings information. • If you are using downloaded fonts, verify the fonts are supported by the printer, the host computer, and the software application. • Verify the print media type and print tray type settings match. • Verify you are using the correct printer drivers. Part or all of the page is - Lexmark T642 | Service Manual - Page 204
toner. driver and on the printer Embedded Web Server (EWS) driver, enable the check box. In the driver, disable the check box. In the driver, enable the check box. In the driver, disable the check box. In the driver, enable the check box. In the driver, disable the check box. 3-36 Service Manual - Lexmark T642 | Service Manual - Page 205
in the input options or the duplex tray. Jams inside the printer occur in two locations and require the removal of the print cartridge. Jams can also occur at the rear of the printer or in one of the output options. Note: The following clearing jam instructions may seem out of sequence. However - Lexmark T642 | Service Manual - Page 206
paper from the multipurpose feeder. 2. Flex, fan, and restack the media, and place it into the multipurpose feeder. 3. Load the print media. 4. Slide the side guide toward the inside of the tray until it lightly rests against the edge of the media. 5. Press . 3-38 - Lexmark T642 | Service Manual - Page 207
feeder. a. Lift the envelope feeder up out of the printer, and then set it aside. b. Remove the envelope from the printer. If you cannot remove the envelope, the print cartridge will have to be removed. See "200 and 201 Paper Jam Remove Cartridge" on page 3-41 for more information. c. Reinstall the - Lexmark T642 | Service Manual - Page 208
areas can occur on the incline surface of a tray or across more than one tray. To clear these areas: 1. Open the printer paper tray, and remove any jammed media. 2. Open the duplex tray. To remove the media, pull up. 3. Open any optional trays beginning at the top, and remove any jammed media - Lexmark T642 | Service Manual - Page 209
feeder. 2. Push the release latch, and open the top front cover. CAUTION: The inside of the printer is hot. 3. Lift and pull the print cartridge out of the printer. Warning: Do not touch the photoconductor drum on the underside of the cartridge. Use the cartridge handle whenever you are holding the - Lexmark T642 | Service Manual - Page 210
toward you. Warning: If the print media does not move immediately when you pull, stop pulling. You need to access the print media from the printer rear door. 6. Reinstall the toner cartridge. 7. Close the top front cover. 8. Close the multipurpose feeder. 9. Press . 3-42 Service Manual - Lexmark T642 | Service Manual - Page 211
4061-xx0 202 Paper Jam Open Rear Door 1. If the paper is exiting the printer, pull the media straight out, and press . Otherwise continue with step 2. 2. Open the printer rear door. 3. Remove the jammed media. 4. Close the rear door. 5. Press . Diagnostic aids 3-43 - Lexmark T642 | Service Manual - Page 212
4061-xx0 23x Paper Jam Open Duplex Rear Door 1. Open the duplex rear door. 2. Remove the jammed media. Depending on the media location, pull the media either up or down. 3. Close the duplex rear door. Make sure it snaps into place. 4. Press . 3-44 Service Manual - Lexmark T642 | Service Manual - Page 213
4061-xx0 270 and 280 Paper Jams Paper jams in this group have been divided into 27x and 28x groups. If you have an output expander, highcapacity output stacker, or the 5-bin mailbox, see "27x Paper Jam Check Bin x". If you have a finisher, see "28x Paper Jam Check Finisher". 27x Paper Jam Check Bin - Lexmark T642 | Service Manual - Page 214
center. The rear door will open and drop down. 2. Remove the jammed media. 3. Close the rear door, and make sure the door is secure. 3-46 Service Manual - Lexmark T642 | Service Manual - Page 215
4. Lift the front edge of the finisher output bin cover until it locks into position. 5. Remove the stack of print media. 4061-xx0 6. Close the finisher output bin cover. 7. Press . Diagnostic aids 3-47 - Lexmark T642 | Service Manual - Page 216
indicates staples are jammed in the stapler. This requires removing the staple cartridge holder from the printer. 1. Lift the front edge of the finisher output bin cover until covering on the bottom of the cartridge holder to make sure no staples are jammed in the entry throat. 3-48 Service Manual - Lexmark T642 | Service Manual - Page 217
8. Press down on the staple guard until it snaps securely into place. 4061-xx0 9. Push the cartridge holder firmly into the stapler until the cartridge holder clicks into place. 10. Close the stapler access door. 11. Close the finisher output bin cover. Diagnostic aids 3-49 - Lexmark T642 | Service Manual - Page 218
4061-xx0 3-50 Service Manual - Lexmark T642 | Service Manual - Page 219
electronic products use parts that are known to be sensitive to electrostatic discharge (ESD). To prevent damage to ESD-sensitive parts, follow the instructions below in addition to all the usual precautions, such as turning off power before removing logic boards: • Keep the ESD-sensitive part in - Lexmark T642 | Service Manual - Page 220
sheets of paper as they are fed through the printer. This adjustment reduces the printer overall performance, such as pages per minute, but a curl problem. It may take several tries before improvement is noticed. Note: This setting has no effect when duplexing. Printhead assembly. 4-2 Service Manual - Lexmark T642 | Service Manual - Page 221
out far enough to allow the alignment assembly to be removed from the printer. It is not necessary to completely remove the screw. 4. Install the new alignment assembly. Turn the reference screw clockwise with a 7 mm nut driver until it touches the back of the reference plate, and tighten the nut - Lexmark T642 | Service Manual - Page 222
to prevent damage to the printer. CAUTION: Use the handholds on the side of the printer. Make sure your fingers are not under the printer when you lift or set the printer down. Note: Some removal the two latches together, and pull up. 2. Remove the fuser wiper cover assembly. 4-4 Service Manual - Lexmark T642 | Service Manual - Page 223
Redrive cap cover removal 1. Pull up on the right side of the redrive cap cover to remove. 4061-xx0 2. Remove the redrive cap cover. Paper support removal 1. Raise the paper support, and lift to release the latches. 2. Remove the paper support. Repair information 4-5 - Lexmark T642 | Service Manual - Page 224
4061-xx0 Left door removal 1. Open the upper and lower front covers. 2. Press the two left door latch buttons (A), and open the left door. 3. Release the top hinge from the latch. 4-6 Service Manual - Lexmark T642 | Service Manual - Page 225
4. Lift the door to release the bottom from the pin (B), and remove the door. 4061-xx0 Redrive door 1. With the redrive door partially open, lift and free the left side. 2. Remove the redrive door. Repair information 4-7 - Lexmark T642 | Service Manual - Page 226
Right cover removal 1. Remove the redrive cap. See"Redrive cap cover removal" on page 4-5. 2. Open the upper and lower front covers. 3. Remove the print cartridge. 4. Remove the right front cover mounting screw (A). 5. Remove the redrive door. See "Redrive door" on page 4-7. 6. Remove the two screws - Lexmark T642 | Service Manual - Page 227
7. Remove the right rear cover mounting screw (C). 4061-xx0 8. Press the two latches to remove the redrive assembly. Repair information 4-9 - Lexmark T642 | Service Manual - Page 228
: When replacing the right side cover, make sure the three cover retainers are correctly located in the appropriate slots in the right side frame. 4-10 Service Manual - Lexmark T642 | Service Manual - Page 229
be rendered inoperable. Warning: Never install and remove components listed above as a method of troubleshooting components. Once a component has been installed in a printer, it can not be used in another printer. It must be returned to the manufacturer. 1. Open the lower front cover. 2. Open the - Lexmark T642 | Service Manual - Page 230
: When removing the upper front cover outer bezel, use care not to lose or drop the clear plastic inner bezel. Installation notes: • Lift the paper support before installing the upper front cover. • Make sure the operator panel cable is in the cable clip (C), if removed. 4-12 - Lexmark T642 | Service Manual - Page 231
Upper front cover latch removal 1. Remove the upper front cover. 2. Remove the screw (A) holding the latch and spring to the upper front cover. 4061-xx0 Installation note: The spring (B) is installed as shown. Repair information 4-13 - Lexmark T642 | Service Manual - Page 232
on the open lower front cover. The clear inner bezel (B) is not connected and may fall. The cloth may prevent scratches on the bezel. 4-14 Service Manual - Lexmark T642 | Service Manual - Page 233
4061-xx0 Multipurpose feeder/lower front cover assembly removal 1. Open the multipurpose tray to a position that allows the left and right tray hinge slots (A) to align with the D-shape mounting posts (B). Pull upward on each tray hinge to remove the tray from the two mounting posts. Warning: Be - Lexmark T642 | Service Manual - Page 234
cover removal" on page 4-8. 2. Remove the two screws (A) holding the top of the right handle holder in place. 3. Lift out the right handle holder. 4-16 Service Manual - Lexmark T642 | Service Manual - Page 235
Left and right frame extensions 1. Remove the toner cartridge. 2. Turn the printer on its back. 3. Remove the two screws (A) holding the right frame extension. 4. Remove the two screws (B) securing the left frame extension. 4061-xx0 Repair information 4-17 - Lexmark T642 | Service Manual - Page 236
the fuser to system board DC cable (B) secured through the plate. Note: Note the routing of the fuser card to system board DC cable. 4-18 Service Manual - Lexmark T642 | Service Manual - Page 237
" on page 4-8. 3. Remove the paper support. See "Paper support removal" on page 4-5. 4. Remove the redrive cap. See "Redrive cap cover removal" on page 4-5. 5. Press the fuser wiper cover latch, and remove the cover. 6. Remove the screw (A) at the rear of the printer and the larger screw (B) at the - Lexmark T642 | Service Manual - Page 238
4061-xx0 8. Remove the paper bin full sensor flag from the mounting bracket. See "Paper bin full sensor flag removal" on page 4-70. 9. Unlatch the front right and front left cover posts, and remove the cover. 4-20 Service Manual - Lexmark T642 | Service Manual - Page 239
removal 1. Open the left door. 2. Remove the inner shield. 3. Remove the gear guard. 4. Remove the power takeoff shaft and spring (A) through the bottom of the printer. 4061-xx0 5. Place your thumb on the top of the gear, and press firmly down and away. Note: You need to exert firm pressure to - Lexmark T642 | Service Manual - Page 240
double-snaps into place, it may pinch your hand. 5. Install the power takeoff shaft and spring. 6. Install the gear guard. 7. Install the inner shield. 4-22 Service Manual - Lexmark T642 | Service Manual - Page 241
from J2 on the system board. 3. Remove the three screws securing the cartridge duct (A). Note: It may be necessary to pull the main fan cable (B) up and out of the way to remove the duct. 4. Reconnect the printhead laser cable. Note: Be sure to reposition the main fan cable if you moved - Lexmark T642 | Service Manual - Page 242
drive shaft on the developer drive. 3. Align the developer drive shaft with the coupler. 4. Be sure to replace the screws in the same positions. 4-24 Service Manual - Lexmark T642 | Service Manual - Page 243
Developer drive coupler kit removal 1. Remove the developer drive. See "Developer drive assembly removal" on page 4-24. 2. Remove the shaft drive and coupler. 4061-xx0 ESD cover removal 1. Open the multipurpose tray, and remove the tray from the two mounting posts. See "Multipurpose feeder/ lower - Lexmark T642 | Service Manual - Page 244
4061-xx0 Fuser assembly removal CAUTION: Unplug the printer before you begin. 1. Remove the fuser wick assembly cover. See "Fuser wiper cover assembly removal" on page the fuser mounting screws (A). 4. Disconnect the fuser to LVPS AC cable (B) from the fuser lamp connector (C). 4-26 Service Manual - Lexmark T642 | Service Manual - Page 245
5. Disconnect the fuser to system board DC cable (D) from the fuser board. Note: Be sure to observe the routing of the LVPS to fuser lamp AC and the DC cable. 4061-xx0 6. Pull the cables free and remove the fuser. Installation notes 1. When you reinstall the fuser, be sure to route the fuser to - Lexmark T642 | Service Manual - Page 246
exit sensor, flag, and spring. 4. Release the two clips (C) holding the sensor in the bracket. 5. Unplug the fuser exit sensor cable from the sensor. 4-28 Service Manual - Lexmark T642 | Service Manual - Page 247
into the cover. 4061-xx0 2. Connect the fuser exit sensor cable. 3. Snap the bottom fastener of the sensor cover into place in the lower exit guide, and use a small flat bladed screwdriver to ease the sensor cover into the clips. 4. Replace the screw securing the sensor cover. Note: Make sure the - Lexmark T642 | Service Manual - Page 248
fuser exit sensor cover releases the flag and spring. Spring replacement 1. Place the spring on the left pin (A). 2. Set the tang (B) on the flag. 4-30 Service Manual - Lexmark T642 | Service Manual - Page 249
4061-xx0 3. Rotate the bent end (C) of the spring to add tension, place the pins between the sensor cover arms, and rest the bent end against the sensor cover frame. Note: After replacing the sensor, flag, and spring, make sure the flag moves freely and returns. Repair information 4-31 - Lexmark T642 | Service Manual - Page 250
is under spring tension. When the contact is released, damage to the lamp or contact may occur. 4. Remove the left lamp contact assembly. A(202) 4-32 Service Manual - Lexmark T642 | Service Manual - Page 251
4061-xx0 5. Remove the fuser lamp. Warning: The lamp is under spring tension, and care must be used when removing the lamp from the fuser. Grip the lamp by the ceramic end piece, and remove it from the fuser assembly. Be careful not to touch the glass, as skin oils and acids can reduce the life - Lexmark T642 | Service Manual - Page 252
sensor cover to the fuser. 3. With a thumbnail, release the catches (B) holding the sensor cover to the lower exit guide (C) in place. Note: You may need to move the narrow media flag out of the way to remove the sensor. flag out of the way to remove the sensor from the cover. 4-34 Service Manual - Lexmark T642 | Service Manual - Page 253
into the cover. 4061-xx0 2. Connect the fuser narrow media cable. 3. Snap the bottom fastener of the sensor cover into place in the lower exit guide, and rock the cover up until the top fastener snaps securely. 4. Replace the screw securing the sensor cover. Repair information 4-35 - Lexmark T642 | Service Manual - Page 254
far enough apart to release the flag and spring. Spring replacement 1. Place the spring on the left pin (A). 2. Set the tang (B) on the flag. 4-36 Service Manual - Lexmark T642 | Service Manual - Page 255
4061-xx0 3. Rotate the bent end (C) of the spring to add tension, place the pins between the sensor cover arms, and rest the bent end against the sensor cover frame. A Note: After replacing the sensor, flag, and spring, make sure the flag moves properly. Repair information 4-37 - Lexmark T642 | Service Manual - Page 256
4061-xx0 Fuser to LVPS AC cable removal CAUTION: Unplug the printer before you begin. 1. Remove the fuser wick assembly cover. See "Fuser wiper cover assembly removal" on page 4-4. 2. Pass thru plate" on page 4-18. 6. Disconnect the LVPS to system board DC cable (D) from the LVPS. 4-38 Service Manual - Lexmark T642 | Service Manual - Page 257
disconnect the fuser to LVPS AC cable from the LVPS (E). Note: The LVPS assembly may be difficult to remove from the printer. Do not use excessive force in the removal. 8. Remove the fuser to LVPS AC cable. Installation 1. Plug in the fuser to LVPS AC cable (A) into - Lexmark T642 | Service Manual - Page 258
4061-xx0 3. Route the cable through the lower rectangular opening (E). 4. Connect the fuser to LVPS AC cable to the fuser lamp connector (F). Note: Be sure to connect the fuser to system board DC cable after replacing the LVPS. 4-40 Service Manual - Lexmark T642 | Service Manual - Page 259
Fuser top cover removal CAUTION: Unplug the printer before you begin. 4061-xx0 1. Remove the fuser assembly. See "Fuser assembly removal" on page 4-26. 2. Note the thermistor cable routing (A) and disconnect the thermistor - Lexmark T642 | Service Manual - Page 260
attach the fuser upper cover assembly to the fuser frame. 7. Remove screw (H) that attaches the side fuser lamp contact to the fuser top cover. F H G 4-42 Service Manual - Lexmark T642 | Service Manual - Page 261
8. Remove the fuser cover. 4061-xx0 Fuser transfer plate removal 1. Remove the upper paper deflector. See "Upper paper deflector assembly removal" on page 4-79. 2. Remove the transfer roll. See "Transfer roll assembly removal" on page 4-77. 3. Remove the inner paper deflector. See "Inner paper - Lexmark T642 | Service Manual - Page 262
make it easier to remove the link. 4. Rotate the link to disconnect the link from the main drive assembly. 5. Remove the gear release link. 4-44 Service Manual - Lexmark T642 | Service Manual - Page 263
High voltage power supply removal CAUTION: There is a danger from hazardous voltage in the area of the printer where you are working. Unplug the printer before you begin, or use caution if the printer must receive power in order to perform the task. 1. Remove the inner paper deflector. See "Inner - Lexmark T642 | Service Manual - Page 264
4061-xx0 5. Remove the HVPS mounting screws (C). 6. Slide the HVPS to the left to release the mounting tab from the center pan, and remove the HVPS. 4-46 Service Manual - Lexmark T642 | Service Manual - Page 265
. See "Upper paper deflector assembly removal" on page 4-79. 3. Remove the MPF lower deflector assembly. See "MPF lower paper deflector" on page 4-61. 4. Place the printer on its side. 5. Gently pry the inner paper deflector from the left and right mounting posts (A) located on the bottom of the - Lexmark T642 | Service Manual - Page 266
deflector assembly removal" on page 4-47. 4. Disconnect the input sensor cable (A) from the input sensor (B). 5. Release the input sensor from its mounting, and remove. 4-48 Service Manual - Lexmark T642 | Service Manual - Page 267
paper tray. 2. Remove the left door. See "Left door removal" on page 4-6. 3. Remove the outer shield. See "Outer shield removal" on page 4-67. 4. Place the printer on its back. 5. Disconnect the autocompensator motor cable (A) from the system board (J24). 4061-xx0 Repair information 4-49 - Lexmark T642 | Service Manual - Page 268
4061-xx0 6. Locate the integrated tray autocompensator assembly (B) on the bottom of the printer, and disconnect the autocompensator arm bias spring (C). Note: When you remove the spring, note from the outside of the frame. 11. Remove the integrated tray autocompensator assembly. 4-50 Service Manual - Lexmark T642 | Service Manual - Page 269
4061-xx0 Integrated tray autocompensator pick roll assembly removal 1. Remove the integrated tray, and look underneath the printer for the autocompensator arm. Pull the arm down. 2. Press on the end of the tab (A) and pull the pick roll off the arm. Repeat this - Lexmark T642 | Service Manual - Page 270
the tab aligned. Repeat this step on the other side to install the other pick roll. 4. Gently release the autocompensator arm. Insert, integrated tray. 4-52 Service Manual - Lexmark T642 | Service Manual - Page 271
as a method of troubleshooting components. Once a component has been installed in a printer, it can not be used in another printer. It must be card. Go to "Configuration ID" on page 3-21. 1. Remove any feature or option cards from the interconnect card. 2. Remove the two screws securing the - Lexmark T642 | Service Manual - Page 272
4061-xx0 Low voltage power supply removal CAUTION: Unplug the printer before you begin. 1. Remove the redrive assembly. See "Redrive assembly removal" on page 4-74. 2. Remove the right to disconnect. There are catches (B) that firmly hold latches on the LVPS card connector (C). 4-54 Service Manual - Lexmark T642 | Service Manual - Page 273
4061-xx0 6. Pull the LVPS assembly far enough out from the right side of the printer to disconnect the fuser to LVPS AC lamp cable (D). Warning: The LVPS assembly may be difficult to remove from the printer. Do not use excessive force in the removal. 7. Remove the low voltage power supply. Repair - Lexmark T642 | Service Manual - Page 274
. Note the location of the cable tie for later replacement. 6. Disconnect the main fan to the system board (C) at J4. 7. Remove the main fan. 4-56 Service Manual - Lexmark T642 | Service Manual - Page 275
4061-xx0 Installation note: The fan has an orientation marking (D). Be sure to install the fan with the arrow pointing up. Main drive assembly removal 1. Remove the system board and inner shield. See "System board and inner shield removal" on page 4-76. 2. Remove the screw securing the gear guard - Lexmark T642 | Service Manual - Page 276
4061-xx0 5. Lift and remove the cables from the cable hooks (B). 6. Remove the ground cable screw (C). 7. Remove the main drive assembly mounting screws (D). 4-58 Service Manual - Lexmark T642 | Service Manual - Page 277
main drive motor cable from the main drive assembly. 10. Remove the main drive assembly. Warning: Whenever the main drive assembly is removed from the printer it must be handled very carefully. Do not allow any of the gears to come in contact with any metal or other hard surface to - Lexmark T642 | Service Manual - Page 278
assembly. See "MPF solenoid assembly removal" on page 4-62. 7. Remove the C-clip (A). 8. Remove the washer, and set it aside. 9. Remove the MPF arm assembly. 4-60 Service Manual - Lexmark T642 | Service Manual - Page 279
Installation note: Note the order of C-clips bushing, and washer when you reinstall. 4061-xx0 MPF lower paper deflector 1. Remove the MPF lower cover. 2. Remove the four screws securing the MPF lower paper deflector. 3. Remove the defector. Repair information 4-61 - Lexmark T642 | Service Manual - Page 280
" on page 4-61. 4. Remove the upper paper deflector. See "Upper paper deflector assembly removal" on page 4-79. 5. Remove the C-clip (A) on the left side. 4-62 Service Manual - Lexmark T642 | Service Manual - Page 281
6. Press the clips on the end of the shaft to remove the MPF tires (B). 7. Remove the C-clip (C) on the shaft. 4061-xx0 C B 8. Remove the bushing (D). Note: The bushing fits into a detent (E) in the frame of the MPF arm assembly. Repair information 4-63 - Lexmark T642 | Service Manual - Page 282
(G) to the right until the left end of the shaft is clear of the frame, and slide the MPF solenoid assembly from the shaft. 4-64 Service Manual - Lexmark T642 | Service Manual - Page 283
4061-xx0 Installation note: Be careful not to lose the washer (H) that is between the MPF solenoid assembly and the C-clip. It belongs to the MPF arm assembly. H Repair information 4-65 - Lexmark T642 | Service Manual - Page 284
and remove components listed above as a method of troubleshooting components. Once a component has been installed in a printer, it can not be used in another printer. It must be returned to the manufacturer. 1. parts underneath are free to fall away from the upper front cover. 4-66 Service Manual - Lexmark T642 | Service Manual - Page 285
4061-xx0 Operator panel buttons removal The operator panel and navigation buttons are in a single kit. 1. Remove the operator panel board. See "Operator panel board removal" on page 4-66. 2. Remove the functional rubber sheet (A) and the rubber dome sheet (B). 3. The navigation buttons and the - Lexmark T642 | Service Manual - Page 286
" on page 4-47. 3. Release the input paper sensor from its mounting, and remove. 4. Remove the left door. 5. Remove the paper alignment assembly mounting screws (A). 4-68 Service Manual - Lexmark T642 | Service Manual - Page 287
4061-xx0 6. Locate the paper alignment assembly reference adjustment screw (B) through the left frame, and remove the screw. B 7. Remove the paper alignment assembly. Note: Do the "Paper alignment assembly adjustment" on page 4-3 when you reinstall the assembly. Repair information 4-69 - Lexmark T642 | Service Manual - Page 288
cover assembly. See "Fuser wiper cover assembly removal" on page 4-4 4. Remove the mounting screws (A) from the left side. A 5. Lift the left corner of the laser cover assembly cover to access the flag. 6. Use your thumb to bend the paper full flag assembly slightly to unlatch it from the mounting - Lexmark T642 | Service Manual - Page 289
4061-xx0 Paper size sensing board removal 1. Remove the system board and inner shield. See "System board and inner shield removal" on page 4-76. 2. Remove the paper size sensing board mounting screw (A). 3. Disconnect the paper size sensing board cable (B) from the board. 4. Remove the paper size - Lexmark T642 | Service Manual - Page 290
4061-xx0 Power takeoff shaft and spring removal Remove the power takeoff shaft and spring (A) through the bottom of the printer. 4-72 Service Manual - Lexmark T642 | Service Manual - Page 291
4061-xx0 Printhead removal CAUTION: The laser scanning unit is not a serviceable FRU. Replace the entire unit when service is required. 1. Remove the laser cover. See "Laser cover removal" on page 4-19. 2. Disconnect the printhead cable (A) from the printhead assembly. 3. Remove the three printhead - Lexmark T642 | Service Manual - Page 292
4061-xx0 Redrive assembly removal 1. Remove the redrive door assembly. 2. Remove the redrive exit cover. 3. Remove the redrive assembly mounting screws (A). 4. Release the redrive assembly mounting latches (B), and remove the redrive assembly. 4-74 Service Manual - Lexmark T642 | Service Manual - Page 293
Signature button contact assembly removal 1. Remove the print cartridge. 2. Remove the left side door. See "Left door removal" on page 4-6. 3. Remove the right cover. See "Right cover removal" on page 4-8. 4. Remove outer system board - Lexmark T642 | Service Manual - Page 294
of troubleshooting components. Once a component has been installed in a printer, it can not be used in another printer. the connectors. 3. Remove all features and options from the interconnect card. 4. Depending on your printer model, remove the two small and inner shield. 4-76 Service Manual E F - Lexmark T642 | Service Manual - Page 295
page 4-8. 2. Remove the toner sensor mounting screw (A). 3. Disconnect the toner sensor cable, and remove the toner sensor. 4061-xx0 Transfer cartridge. 2. Unsnap the transfer roll assembly from the left pivot arm. 3. Lift the transfer roll assembly toward the left, and remove it from the printer - Lexmark T642 | Service Manual - Page 296
Remove the upper front cover. See "Upper front cover removal" on page 4-11. 2. Remove the laser cover assembly. See "Laser cover removal" on page 4-19. 3. Remove the C-clips (A) from the upper front cover hinge assembly bracket. 10. Remove the upper front cover hinge assembly. 4-78 Service Manual - Lexmark T642 | Service Manual - Page 297
4061-xx0 Upper paper deflector assembly removal 1. Either lift the ESD cover out of the way or remove it. See "ESD cover removal" on page 4-25. Note: The tabs holding the ESD cover are easily stressed or broken. 2. Lift the left side to release the small tab (A) on the left and the MPF flag (B) and - Lexmark T642 | Service Manual - Page 298
4061-xx0 USB board assembly removal 1. Remove the upper front cover. 2. Disconnect the USB cable from the USB board assembly. 3. Remove the screw (A) securing the USB board assembly. 4-80 Service Manual - Lexmark T642 | Service Manual - Page 299
5. Connector locations and connections Connections System board 4061-xx0 Connector locations and connections 5-1 - Lexmark T642 | Service Manual - Page 300
(see "System board" on page 5-1) Connector J1 Interconnect card J2 Printhead (laser cable) J3 Printhead (HSYNC)/mirror motor J4 Main fan J5 Cartridge fan J6 Hopper full (output bin sensor) J7 USB port 5-2 Service Manual Pin no. Signal 1 Video Level 2+ 2 Video3* 3 Ground 4 +5PHead 5 LPOW - Lexmark T642 | Service Manual - Page 301
" on page 5-1) Connector J8 Cover closed switch J10 Fuser DC J13 Operator panel J14 Signature button J15 HVPS input sensor Cartridge toner wheel sensor Pin no. 1 2 3 1 2 3 4 5 6 7 8 9 10 11 1 2 3 4 5 6 7 1 2 1 2 3 4 5 6 7 8 9 10 11 12 13 Signal Cov Closed Ground +5V dc NARMEDIA* Ground THERM - Lexmark T642 | Service Manual - Page 302
Front/bottom options J20 Transport motor J21 Autoconnect-top J23 MPF pick solenoid J24 Autocomp motor J25 Autoconnect-bottom/front 5-4 Service Manual Pin no. 1 2 3 4 5 6 7 8 9 10 11 12 13 Signal 1 Ground 2 +24 V dc OTC OPT 1 BLDC_HALL 0 2 BLDC_HALL 1 3 BLDC_HALL 2 4 BLDC FG 5 Ground - Lexmark T642 | Service Manual - Page 303
System board (see "System board" on page 5-1) Connector J26 Paper size sensor/autocomp motor J27 LVPS J28 MPF paper out J29 Top options 4061-xx0 Pin no. 1 2 3 4 5 6 7 8 9 10 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 1 2 3 1 2 3 4 Signal PSIZE2 Ground PSIZE1 PSIZE3 Ground TRAY1 POUT TRAY1 - Lexmark T642 | Service Manual - Page 304
DI+ Ground Ground +24V dc PH FAN* Pin no. 1 2 3 4 5 6 Signal (static) +24 V dc 0 V dc +5 V dc 0 V dc 0 V dc 0 V dc 1 0 V dc 2 0 V dc 3 0 V dc 4 +5 V dc 5 0 V dc 6 +24 V dc 5-6 Service Manual - Lexmark T642 | Service Manual - Page 305
Connector Top autoconnect Fuser Board Fuser Board (not a FRU) - - - - - 4061-xx0 Pin no. 1 2 3 4 5 6 7 8 Signal (static) 0 V dc +5 V dc 0 V dc 0 V dc 0 V dc +5 V dc 0 V dc +24 V dc Connectors J1-System board J2-Narrow media sensor J3-N/A J4-Solenoid - Lexmark T642 | Service Manual - Page 306
Ground prtrxd Ground Ground Paper Present RVsnsr mtrout1 mtrout2 Ground Ground tach + +5 V dc Ground Ground binful binful RVsnsr Upper unit Upper/Lower Unit Lower Unit 5-8 Service Manual - Lexmark T642 | Service Manual - Page 307
High voltage power supply Connector CN1 System board 7 Interconnect card Connector -& &KJ -& -& 3&' -& -& 'HY -& -& 7$5 -& -& 'U % -& 4061-xx0 &1 CN no. 1 2 3 4 5 6 7 8 Signal Developer PWM +24 V dc Return Charge PWM +24 V dc IN TX PWM TX Enable TX CUR PWM SVRO OUT Connector - Lexmark T642 | Service Manual - Page 308
V dc 9 Heat on 10 +5 V dc 11 +5 V dc 12 Ground 13 Ground 14 Ground 15 Ground 16 +24 V dc 17 ZC Out* 18 +42 V dc 5-10 Service Manual - Lexmark T642 | Service Manual - Page 309
4061-xx0 Output expander control board *" 5 #2 #2 1 5 *! # # 5 5 - Lexmark T642 | Service Manual - Page 310
fdmtr1 fdmtr2 Ground Ground tachft 5Vptt stpmtrstpmtrstpmtr+ stpmtr+ crtprsntstplow+ 'stpphomoGround 5Vstpl stprimed+24 V dc accmtrGround Ground tacha+ 5Vptt Sol1+24 V dc Ground pfrinstp+ 5Vsnsr2 5-12 Service Manual - Lexmark T642 | Service Manual - Page 311
Staple card assembly (continued) - - - - - - - - - -$ - -% - - 4061-xx0 Connector J7 Right side sensor board J8 Solenoid J9 Bin empty sensor J10 Left side sensor board J12 Pass thru sensor J13 Cover open switch J14A J14B J15 Stapler - Lexmark T642 | Service Manual - Page 312
4061-xx0 5-14 Service Manual - Lexmark T642 | Service Manual - Page 313
printer preventive maintenance. Following these recommendations can help prevent problems and maintain optimum performance. Safety inspection guide The purpose of this inspection guide any non-Lexmark attachments. Lubrication specifications No requirements for this printer. Scheduled maintenance - Lexmark T642 | Service Manual - Page 314
4061-xx0 6-2 Service Manual - Lexmark T642 | Service Manual - Page 315
in a parts packet. Model information used in the parts catalog. Model name Lexmark T640 Lexmark T640n Lexmark T642 Lexmark T642n Lexmark T644 Lexmark T644n Configuration Non-network Network Non-network Network Non-network Network Machine type 4061-000 4061-010 4061-200 4061-210 4061-400 4060-410 - Lexmark T642 | Service Manual - Page 316
4061-xx0 Assembly 1: Covers 7-2 Service Manual - Lexmark T642 | Service Manual - Page 317
assembly Laser cover assembly-250-sheet output, 000/010 Laser cover assembly-500-sheet output, 200/210/400/410 Counterbalance spring Paper support Upper Lower front cover assembly USB board assembly Upper front cover assembly with Lexmark logo, including • Operator panel board (1) • Stop button (1) - Lexmark T642 | Service Manual - Page 318
4061-xx0 Assembly 2: Frame 1 7-4 Service Manual - Lexmark T642 | Service Manual - Page 319
Assembly 2: Frame 1 AsmIndex 1 2 3 4 5 6 7 8 9 Part number 40X0065 40X0225 40X0024 40X0026 40X0025 40X0060 40X0331 40X0285 Units/ mach 4 1 4 1 1 1 1 1 1 Units/ kit or pkg 1 1 4 1 1 1 1 1 1 Description Frame extension, nut plate, 200/210/400/410 Right side hand holder Parts packet (PP 40X0165) - Lexmark T642 | Service Manual - Page 320
4061-xx0 Assembly 3: Frame 2 7-6 Service Manual - Lexmark T642 | Service Manual - Page 321
flag, 200/210/400/410 Main fan cap Redrive door assembly 250 sheet 000/010 Redrive door assembly 500 sheet 200/210/400/410 Extension guide Parts catalog 7-7 - Lexmark T642 | Service Manual - Page 322
4061-xx0 Assembly 4: Frame 3 7-8 Service Manual - Lexmark T642 | Service Manual - Page 323
assembly, 000/010 Machine mounting pad HVPS/input sensor/toner sensor cable assembly Toner sensor assembly High voltage contact kit, including: • Cartridge holddown assembly Upper paper feed deflector Inner paper feed deflector, 000/010 Inner paper feed deflector, 200/210/400/410 Developer support - Lexmark T642 | Service Manual - Page 324
4061-xx0 Assembly 5: Printhead 7-10 Service Manual - Lexmark T642 | Service Manual - Page 325
3 Part number 40X0061 40X0062 Units/ mach 1 1 Units/ kit or pkg 1 1 Description Laser cable assembly Parts packet (printhead mounting screw) (PP 40X0165) Printhead assembly (includes all cables) CAUTION:The printhead is not a serviceable FRU. Do not disassemble the printhead. Parts catalog 7-11 - Lexmark T642 | Service Manual - Page 326
4061-xx0 Assembly 6: Paper feed-autocompensator 7-12 Service Manual - Lexmark T642 | Service Manual - Page 327
4061-xx0 Assembly 6: Paper feed-autocompensator AsmIndex 6-1 1 2 2 3 4 4 5 6 7 Part number 40X0066 40X0067 40X0068 40X0069 40X0070 40X0071 40X0072 40X0073 40X0074 Units/ mach 1 1 1 1 2 1 1 1 1 Units/ kit or pkg 1 1 1 1 2 1 1 1 1 Description Pick arm assembly-500-sheet, 200/210/400/410 Pick arm - Lexmark T642 | Service Manual - Page 328
4061-xx0 Assembly 7: Paper feed-multipurpose feeder 7-14 Service Manual - Lexmark T642 | Service Manual - Page 329
4061-xx0 Assembly 7: Paper feed-multipurpose feeder AsmIndex 7-1 2 3 4 5 5 5 NS Part number 40X0079 40X0310 40X0076 40X0077 Units/ mach 1 1 1 1 Units/ kit or pkg 1 1 1 1 1 Description Multipurpose feeder lower deflector assembly Multipurpose feeder pick arm assembly with solenoid Pick roll - Lexmark T642 | Service Manual - Page 330
4061-xx0 Assembly 8: Paper feed-alignment 7-16 Service Manual - Lexmark T642 | Service Manual - Page 331
4061-xx0 Assembly 8: Paper feed-alignment AsmIndex 8-1 2 3 4 NS Part number 40X0084 40X0085 40X0086 Units/ mach 1 1 Units/ kit or pkg 1 1 Description Paper feed alignment assembly paper feed Parts packet (clip ref ground mounting screw) (PP 40X0165) Reference ground clip Parts packet ( - Lexmark T642 | Service Manual - Page 332
4061-xx0 Assembly 9: Integrated 250-sheet paper tray 7-18 Service Manual - Lexmark T642 | Service Manual - Page 333
Assembly 9: Integrated 250-sheet paper tray AsmIndex 9-1 2 3 4 5 6 7 Part number 40X0087 40X0092 40X0093 40X0263 40X0094 40X0105 40X0090 Units/ mach 1 1 4 1 1 2 1 Units/ kit or pkg 1 1 1 1 1 1 1 Description Integrated 250-sheet tray Side restraint-250-sheet tray Wear strips Pass thru plate-250- - Lexmark T642 | Service Manual - Page 334
4061-xx0 Assembly 10: Integrated 500-sheet paper tray 7-20 Service Manual - Lexmark T642 | Service Manual - Page 335
Assembly 10: Integrated 500-sheet paper tray AsmIndex 10-1 2 3 4 5 6 7 Part number 40X0098 40X0099 40X0182 40X0103 40X0183 40X0105 40X0106 Units/ mach 1 1 4 1 1 2 1 Units/ kit or pkg 1 1 1 1 1 1 1 Description Tray assembly-500-sheet tray Side restraint Wear strip Pass thru plate-500-sheet tray - Lexmark T642 | Service Manual - Page 336
4061-xx0 Assembly 11: Drives-Main drive and developer drive 7-22 Service Manual - Lexmark T642 | Service Manual - Page 337
shaft-500-sheet, 200/210/400/410 Power takeoff shaft spring Bevel gear with grease packet and washer • Bevel gear (1) • Instruction sheet (1) • Grease packet (1) Developer drive assembly Parts packet, developer drive • Developer drive shaft (1) • shaft, coupler gear #55 (1) Parts packet (developer - Lexmark T642 | Service Manual - Page 338
4061-xx0 Assembly 12: Hot roll fuser 2EAR - Lexmark T642 | Service Manual - Page 339
Assembly 12: Hot roll fuser AsmIndex 12-1 1 1 2 3 3 4 5 6 7 8 9 10 11 12 13 NS Part number 40X2592 40X2591 40X2590 40X0120 40X0122 40X0123 40X0121 40X0239 40X0236 40X0125 40X0230 40X0238 40X0124 40X0229 40X0226 Units/ mach 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Units/ kit or pkg 1 1 1 1 1 1 1 1 1 1 1 1 1 - Lexmark T642 | Service Manual - Page 340
4061-xx0 Assembly 13: Transfer/charging 7-26 Service Manual - Lexmark T642 | Service Manual - Page 341
Assembly 13: Transfer/charging AsmIndex 13-1 2 3 4 5 6 7 8 9 NS NS Part number 40X0126 40X0127 40X0129 40X0130 40X0131 40X0132 40X0133 40X0134 40X0135 Units/ mach 1 1 1 1 1 1 1 Units/ kit or pkg 1 2 1 1 1 1 1 1 1 1 1 Description Parts kit, charge roll link asm, left side Charge roll assembly, - Lexmark T642 | Service Manual - Page 342
4061-xx0 Assembly 14: Electronics-power supplies 7-28 Service Manual - Lexmark T642 | Service Manual - Page 343
V ac, 200/210/400/410 Power cord set (8 ft right angle, 13 amp)-United States, Canada, Caribbean countries, Colombia, Costa Rica, Dominican Republic, El Salvador, Equator, Guatemala, Honduras, Mexico, Nicaragua (PP 40X0165) Front cable harness (HVPS/input sensor/toner sensor) Parts catalog 7-29 - Lexmark T642 | Service Manual - Page 344
4061-xx0 Assembly 15: Electronics-card assemblies Note: 7-30 Service Manual - Lexmark T642 | Service Manual - Page 345
), 200 (Board ID Q0016035) System board assembly (non-network), 400 (Board ID Q0016036) System board assembly (network), 010 (Board ID Q0016031) System board assembly (network), 210 (Board ID Q0016032) System board assembly (network), 410 (Board ID Q0016033) Bar code card assembly IPDS and SC5 - Lexmark T642 | Service Manual - Page 346
4061-xx0 Assembly 16: Electronics-shields 7-32 Service Manual - Lexmark T642 | Service Manual - Page 347
Assembly 16: Electronics-shields AsmIndex 16-1 2 2 2 3 4 5 6 7 Part number 40X0150 40X0149 40X0153 40X0152 40X0154 40X0222 Units/ mach 1 1 1 1 1 1 Units/ kit or pkg 1 1 1 1 1 1 Description Outer shield-2 slot, 200/210/400/410 Parts packet (INA cover mounting screw) (PP 40X0165) Parts packet ( - Lexmark T642 | Service Manual - Page 348
4061-xx0 Assembly 17: Cabling diagrams 1 AsmIndex 17-1 2 3 Part number 40X0223 40X0160 40X0264 Units/ mach 1 1 1 Units/ kit or pkg 1 1 1 Description HVPS/input sensor/toner sensor cable assembly MPF sensor cable Output bin sensor cable 7-34 Service Manual - Lexmark T642 | Service Manual - Page 349
18: Cabling diagrams 2 4061-xx0 AsmIndex 18-1 2 3 Part number 40X0061 40X0074 40X0046 Units/ mach 1 1 1 Units/ kit or pkg 1 1 1 Description Laser printhead cable assembly Autocompensator motor cable Paper size sensing board/Tray 1 autocompensator paper out/low cable Parts catalog 7-35 - Lexmark T642 | Service Manual - Page 350
4061-xx0 Assembly 19: Cabling diagrams 3 7-36 Service Manual - Lexmark T642 | Service Manual - Page 351
40X0224 Units/ mach 1 1 1 1 1 Units/ kit or pkg 1 1 1 1 1 Description Signature button contact assembly with cable Bottom/front autoconnect cable assembly HVPS/input sensor/toner sensor cable assembly Top autoconnect cable assembly LVPS to system board cable assembly 4061-xx0 Parts catalog 7-37 - Lexmark T642 | Service Manual - Page 352
4061-xx0 Assembly 20: Cabling diagrams 4 7-38 Service Manual - Lexmark T642 | Service Manual - Page 353
Assembly 20: Cabling diagrams 4 AsmIndex 20-1 2 3 4 Part number 40X0006 40X0162 40X0163 40X0226 Units/ mach 1 1 1 1 Units/ kit or pkg 1 1 1 1 Description Upper front cover hinge assembly, includes: • USB cable (A) (1) • Operator panel cable (B) (1) • Cover open switch/cable (C) (1) System board - Lexmark T642 | Service Manual - Page 354
4061-xx0 Assembly 21: Cabling diagrams 5 7-40 Service Manual - Lexmark T642 | Service Manual - Page 355
Assembly 21: Cabling diagrams 5 AsmIndex 21-1 2 3 3 4 4 Part number 40X0083 40X0159 40X0035 40X0249 40X0053 40X0054 Units/ mach 1 1 1 1 1 1 Units/ kit or pkg 1 1 1 1 1 1 Description Frame assembly with solenoid and cable Main drive motor cable assembly EP fan with cable-250 sheet, 000/010 EP - Lexmark T642 | Service Manual - Page 356
-sheet paper tray Pick roll assembly Bin low sensor with cable Option pass thru sensor Drive shaft-250-sheet Power takeoff spring Stud assembly 7-42 Service Manual - Lexmark T642 | Service Manual - Page 357
Assembly 23: Optional 250-sheet paper tray 4061-xx0 AsmIndex 23-1 2 3 4 5 6 7 Part number 56P4122 56P4130 56P1279 56P4230 99A0121 99A0120 56P4131 Units/ option 1 1 1 1 1 1 1 Units/ kit or pkg 1 1 4 1 1 2 1 Description Tray assembly, option-250-sheet Side restraint-250-sheet - Lexmark T642 | Service Manual - Page 358
-sheet Bin low sensor with cable Base assembly, 500-sheet Paper out arm-500-sheet drawer Switch activate spring Parts packet (screw) (PP 99A0263) 7-44 Service Manual - Lexmark T642 | Service Manual - Page 359
Assembly 25: Optional 500-sheet paper tray 4061-xx0 AsmIndex 25-1 2 3 4 5 6 7 Part number 56P4150 56P4137 99A0292 56P4196 99A0120 56P4195 56P4147 Units/ option 1 1 1 1 1 1 1 Units/ kit or pkg 1 1 4 1 2 1 1 Description Complete tray assembly-500-sheet Side restraint-500-sheet - Lexmark T642 | Service Manual - Page 360
4061-xx0 Assembly 26: Duplex option AsmIndex 26-1 1 Part number 56P4100 56P4102 Units/ option 1 1 Units/ kit or pkg 1 1 Description Duplex assembly.-250-sheet Duplex assembly-500-sheet 7-46 Service Manual - Lexmark T642 | Service Manual - Page 361
Assembly 27: Envelope feeder 4061-xx0 AsmIndex 27-1 2 Part number 56P4107 56P4229 Units/ option 1 1 Units/ kit or pkg 1 1 Description Complete envelope option Slide out support Parts catalog 7-47 - Lexmark T642 | Service Manual - Page 362
Complete output expander assembly Upper diverter spring Parts packet (PP 99A0263) Output expander tray Left side cover Bin full dual sensor upper stacker assembly 7-48 Service Manual - Lexmark T642 | Service Manual - Page 363
Assembly 29: Output expander 2 4061-xx0 AsmIndex 29-1 2 3 4 Part number 56P4206 56P4235 56P4194 Units/ option 1 1 1 Units/ kit or pkg 1 1 1 Description Rear access door assembly Right side cover Parts packet, screw (PP 99A0263) Output expander pass thru sensor Parts catalog 7-49 - Lexmark T642 | Service Manual - Page 364
high-capacity output expander Rear access door assembly Rear door latch Right cover Front cover Output tray assembly Left cover Tray sensing switch assembly 7-50 Service Manual - Lexmark T642 | Service Manual - Page 365
Assembly 31: High-capacity output expander 2 4061-xx0 AsmIndex 31-1 2 3 4 5 NS Part number 99A0104 99A0415 56P4212 56P4197 56P4210 Units/ option 2 1 1 1 2 Units/ kit or pkg 1 1 31 1 1 1 Description Upper diverter spring Swing arm spring Parts packet (PP 99A0263) Bin full dual - Lexmark T642 | Service Manual - Page 366
4061-xx0 Assembly 32: High-capacity output expander 3 7-52 Service Manual - Lexmark T642 | Service Manual - Page 367
Assembly 32: High-capacity output expander 3 AsmIndex 32-1 Part number 56P4194 Units/ option 2 Units/ kit or pkg 1 Description Stacker pass thru sensor 4061-xx0 Parts catalog 7-53 - Lexmark T642 | Service Manual - Page 368
4061-xx0 Assembly 33: 5-bin mailbox 1 7-54 Service Manual - Lexmark T642 | Service Manual - Page 369
Assembly 33: 5-bin mailbox 1 AsmIndex 33-1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Part number 56P4110 56P4176 56P4180 56P4181 99A1785 99A0104 56P4183 56P4178 56P4190 56P4182 56P4191 56P4186 56P4188 56P4179 Units/ option 1 1 1 1 2 1 1 1 2 5 1 1 5 5 1 Units/ kit or pkg 1 1 1 2 1 1 1 1 1 1 1 1 1 1 - Lexmark T642 | Service Manual - Page 370
4061-xx0 Assembly 34: 5-bin mailbox 2 7-56 Service Manual - Lexmark T642 | Service Manual - Page 371
Assembly 34 (cont.): 5-bin mailbox 2 AsmIndex 34-1 2 Part number 56P4185 Units/ option 4 Units/ kit or pkg 12 1 Description Parts packet (board mounting screw) (PP 99A0263) Diverter solenoid 4061-xx0 Parts catalog 7-57 - Lexmark T642 | Service Manual - Page 372
4061-xx0 Assembly 35: High-capacity feeder 1 7-58 Service Manual - Lexmark T642 | Service Manual - Page 373
Assembly 35: High capacity feeder 1 AsmIndex 35-1 1 2 3 4 5 6 7 8 9 10 11 11 Part number 56P4105 56P4106 99A1818 99A0681 56P4155 56P4157 56P4142 99A0658 Units/ option 1 1 1 4 1 1 4 4 4 1 4 4 2 Units/ kit or pkg 1 1 1 1 1 2 1 1 1 1 4 4 2 Description Complete option assembly (letter) Complete - Lexmark T642 | Service Manual - Page 374
4061-xx0 Assembly 36: High-capacity feeder 2 7-60 Service Manual - Lexmark T642 | Service Manual - Page 375
Assembly 36: High-capacity feeder 2 AsmIndex 36-1 2 3 4 Part number 99A0654 99A1808 99A0667 Units/ option 1 1 1 Units/ kit or pkg 1 1 1 Description Paper low switch Parts packet (nuts) (PP 99A0676) AC external jumper cord Power supply board 4061-xx0 Parts catalog 7-61 - Lexmark T642 | Service Manual - Page 376
4061-xx0 Assembly 37: High-capacity feeder 4 AsmIndex 37-1 2 Part number 99A0275 99A0272 Units/ option 1 1 Units/ kit or pkg 1 1 Description Power takeoff spring Drive shaft-250-sheet 7-62 Service Manual - Lexmark T642 | Service Manual - Page 377
Assembly 38: High-capacity feeder 5 4061-xx0 AsmIndex 38-1 2 3 4 Part number 56P4162 99A0070 56P4127 Units/ option 3 1 2 1 Units/ kit or pkg 1 2 1 Description Parts packet (auto comp assembly mounting screw) (PP 99A0263) Pick arm assembly-2000-sheet Pick roll assembly Option pass thru - Lexmark T642 | Service Manual - Page 378
4061-xx0 Assembly 39: Kiosk-vertical and horizontal paper adapters AsmIndex 39-1 2 Part number 56P4108 56P4109 Units/ option Units/ kit or pkg 1 1 Description Complete vertical kiosk option Complete horizontal kiosk option 7-64 Service Manual - Lexmark T642 | Service Manual - Page 379
Assembly 40: StapleSmart finisher I 4061-xx0 AsmIndex 40-1 2 3 4 5 6 7 7 8 9 10 11 12 Part number 56P4117 56P4221 99A1785 56P2114 56P2116 56P2115 56P4222 99A2542 56P4223 56P4224 56P4219 56P4213 56P4218 Units/ option 1 2 1 1 1 1 1 1 1 1 1 1 Units/ kit or pkg 1 - Lexmark T642 | Service Manual - Page 380
4061-xx0 Assembly 41: StapleSmart finisher 2 AsmIndex 41-1 Part number 56P4225 Units/ option 1 Units/ kit or pkg 1 Description Stapler assembly 7-66 Service Manual - Lexmark T642 | Service Manual - Page 381
Assembly 42: StapleSmart finisher 3 4061-xx0 AsmIndex 42-1 2 Part number 56P4226 99A0104 Units/ option 1 1 Units/ kit or pkg 1 1 Description Switch assembly, top cover open Spring, upper diverter Parts catalog 7-67 - Lexmark T642 | Service Manual - Page 382
4061-xx0 Assembly 43: StapleSmart finisher 4 AsmIndex 43-1 Part number 56P4228 Units/ option 1 Units/ kit or pkg 1 Description StapleSmart wheels maintenance kit 7-68 Service Manual - Lexmark T642 | Service Manual - Page 383
assembly 9-pin to Twinax cable 9-pin to Coax (BNC) cable PRESCRIBE card assembly Cartridge shipping package, empty MarkNet 8000 Fast Ethernet MarkNet 8020 Gigabit Ethernet MarkNet 8030 Fiber Relocation kit-250/250-sheet printer Relocation kit-500/500-sheet printer 4061-xx0 Parts catalog 7-69 - Lexmark T642 | Service Manual - Page 384
4061-xx0 7-70 Service Manual - Lexmark T642 | Service Manual - Page 385
sheet drawer, see the instructions included with the option. Installing a 250-sheet or 500-sheet drawer Optional drawers attach under the printer and optional duplex unit. The printer automatically recognizes any drawer that is installed. A drawer consists of a tray and a support unit. The 250-sheet - Lexmark T642 | Service Manual - Page 386
on top of any drawer help you position the support unit so the edges are aligned properly. Make sure the support unit is securely in place. A B C 3. Attach another optional drawer, a duplex unit, or the printer. You can attach a label to the trays to indicate the tray number. A-2 Service Manual - Lexmark T642 | Service Manual - Page 387
, below the standard tray and above any drawers. Note: Two optional duplex units are available. The 250-sheet duplex unit only works with printers that have a 250-sheet standard tray, and the 500-sheet duplex unit only works with printers that have a 500-sheet standard tray. Make sure you have the - Lexmark T642 | Service Manual - Page 388
memory - Flash memory • Firmware cards - Bar Code - IPDS and SCS/TNe - PrintCryption • Other options - Printer hard disk - RS-232 serial interface card - Parallel 1284-C interface card - MarkNet N8000 series internal print servers (also called internal network adapters or INAs) A-4 Service Manual - Lexmark T642 | Service Manual - Page 389
system board You must access the printer system board to install printer memory, flash memory, a firmware card, or an option card. Note: Use a Phillips screwdriver to remove the system board access 4. Loosen, but do not remove, the six screws (A) on the shield. A Appendix A-Options and features A-5 - Lexmark T642 | Service Manual - Page 390
4061-xx0 5. Slide the shield to the right, and then remove it. 6. Set the shield aside. Use the illustration to locate the connector for the card you want to install. Option card connectors Firmware card connector Memory card connector A-6 Service Manual - Lexmark T642 | Service Manual - Page 391
access cover. (See "Accessing the printer system board" on page A-5.) Warning: Printer memory cards are easily damaged by static electricity. Touch something metal such as the printer frame before you touch a memory and store it in a box. 5. Close both latches. Appendix A-Options and features A-7 - Lexmark T642 | Service Manual - Page 392
packaging. If you do not have the original packaging, wrap the flash memory or firmware card in paper, and store it in a box. 5. If you removed an option card to access the flash memory or firmware card, reinstall the option card. (See "Installing an option card" on page A-10.) A-8 Service Manual - Lexmark T642 | Service Manual - Page 393
or firmware cards designed for other printers may not work with the printer. 1. Remove the system board access cover. (See "Accessing the printer system installing the flash memory or firmware card. 2. Unpack the flash memory or firmware card. 3. Holding the flash memory or firmware card (A) by the - Lexmark T642 | Service Manual - Page 394
4061-xx0 Installing an option card The printer has two connectors that support the following option cards: • Hard disk with adapter card • MarkNet N8000 series internal print server • RS-232 or the extra screw shipped with the card). 6. Tighten the screw to secure the card. A B A-10 Service Manual - Lexmark T642 | Service Manual - Page 395
the top front cover. 6. Close the multipurpose feeder. Printing and using features Canceling a print job There are several methods for canceling a print job. • Canceling a job from the printer operator panel. See "Canceling a job from the printer operator panel" on page A-12 • Canceling a job from - Lexmark T642 | Service Manual - Page 396
OS 9 When you send a job to print, the printer icon for your selected printer appears on the desktop. 1. Double-click the printer icon on your desktop. A list of print jobs appears in the printer window. 2. Select the print job you want to cancel. 3. Click the trash can button. A-12 Service Manual - Lexmark T642 | Service Manual - Page 397
is "Connected." If Status is "Not Connected," the LAN drop may not be active, or the network cable may be malfunctioning. Consult a system support person for a solution, and print another network setup page to verify the printer is connected to the network. Appendix A-Options and features A-13 - Lexmark T642 | Service Manual - Page 398
This ensures the job does not print until you are there to retrieve it. No one else using the printer can print the job without the PIN. Windows 1. From a word processor, spreadsheet, browser, or other application Print or Print and Hold, and then follow the driver instructions. A-14 Service Manual - Lexmark T642 | Service Manual - Page 399
you want to print, and then press . Note: After your job prints, it is deleted from printer memory. Entering a personal identification number (PIN) After you select your user name and Confidential Job, : After your job prints, it is deleted from printer memory. Appendix A-Options and features A-15 - Lexmark T642 | Service Manual - Page 400
then follow the driver instructions. 4. Select the type of held job you want, and then send your job to the printer. Go to the printer when you are printer. Go to the printer when you are ready to retrieve your confidential print job, and follow the At the printer steps. A-16 Service Manual - Lexmark T642 | Service Manual - Page 401
type of print job and action you selected. Linking trays Tray linking enables the automatic linking feature for trays when you load the same size and type of print media in multiple sources. The printer automatically links the trays; when one tray is empty, print media feeds from the next linked - Lexmark T642 | Service Manual - Page 402
connectivity. Note: Not all output bins support every paper and envelope size. Output bins Output bin name Each bin accommodates Print media Printer Models Standard bin Standard bin Finisher • (capacity will vary, depending on the media weight.) 1 output expander * A-18 Service Manual - Lexmark T642 | Service Manual - Page 403
• 50 envelopes (75 g/m2) T640 T642 T644 How many can be installed on the printer 3 Bin is allowed to connect with Illustration of output bin 1 5-bin mailbox, 1 high 1 finisher * * See the Setup Guide for information on how to install options in relation to each other. Appendix A-Options and - Lexmark T642 | Service Manual - Page 404
on the values available to configure your output bins, refer to the Menus and Messages Guide. Note: The bin sequence for linking always starts with the Standard Bin and proceeds from . 8. Press until the appears next to Link. 9. Press . The printer returns to the Ready state. A-20 Service Manual - Lexmark T642 | Service Manual - Page 405
, integrated 7-18 250-sheet paper tray, option parts catalog 7-43 service check 2-102 2xx paper jam and paper handing errors 2-44 500-sheet 3-8 canceling a print job 8-11 Card Stock & Label Guide 1-8 card stock, guidelines 1-18 cartridge duct, removal 4-23 characteristics, print media 1-15 code - Lexmark T642 | Service Manual - Page 406
3-6 PRINTER SETUP Configuration ID 3-21 Defaults 3-20 Edge to Edge 3-21 engine settings 3-20 Envelope Enhance 3-20 Model Name 3-20 Page Count 3-20 Par x Strobe Adj 3-21 Perm Page Count 3-20 Serial Number 3-20 REGISTRATION 3-4 Diverter Test 3-16 DRAM Test 3-7 duplex option parts catalog 7-46 service - Lexmark T642 | Service Manual - Page 407
media sensor flag and spring 4-36 flag and spring parts catalog 7-25 flag and spring removal 4-36 parts catalog 7-25 service check 2-93 fuser solenoid adjustment 4-2 service check 2-94 fuser to LVPS AC cable removal 4-38 fuser transfer plate removal 4-43 fuser wiper cover assembly parts catalog - Lexmark T642 | Service Manual - Page 408
service service 4-32 laser cover removal specifications 6-1 M Macintosh 8-11, 8-12, 8-15, 8-16 main drive assembly parts catalog 7-22 removal 4-57 service guide 6-1 maintenance approach 1-1 maintenance kits 6-1 menus accessing service service buttons 2-2 network setup page service check 2-106 upper front - Lexmark T642 | Service Manual - Page 409
specifications 1-8 paper bin full sensor flag 4-70 paper deflector assembly inner 4-47 upper 4-79 paper feed jams 200 and 201 Paper Jam Remove Cartridge 71 paper support removal 4-5 developer drive 7-22 duplex option 7-46 printer 8-15 entering from the driver service check 2-116 troubleshooting - Lexmark T642 | Service Manual - Page 410
cartridge duct 4-23 covers 4-4 fuser wiper cover assembly 4-4 laser cover 4-19 left and right frame extensions 4-17 left cover handle holder 4-16 left door 4-6 paper support arm assembly 4-60 I-6 Service Manual MPF pick tire removal board 4-76 toner sensor 4-77 safety inspection guide 6-1 scheduled - Lexmark T642 | Service Manual - Page 411
toner sensor 2-127 transfer roll 2-128 service error codes 2-8 shield inner shield 4-76 outer 4-67 signature button contact assembly removal 4-75 specifications acoustics 1-7 dimensions 68 service check 2-123 start 2-1 strobe adjustment 3-21 switch, cover closed 2-80 symptoms base printer 2-5 duplex - Lexmark T642 | Service Manual - Page 412
4061-xx0 I-8 Service Manual - Lexmark T642 | Service Manual - Page 413
Laser cover assembly, 250-sheet output, 000/010 7-3 Laser cover assembly, 500-sheet output, 200/210/400/410 7-3 Paper support Lexmark logo, T640 7-3 Lower front cover assembly 7-3 Cover, left side door, 250 1-slot, 000/010 7-3 Cartridge 7-41 Toner sensor assembly 7-9 Developer support roller - Lexmark T642 | Service Manual - Page 414
/010 7-7 Output paper level flag, 200/210/400/410 7-7 Extension guide 7-7 External ground clip 7-5 Laser cable assembly 7-11 Laser printhead cable assembly 7-35 Printhead assembly (includes all cables 7-11 Frame assembly right arm 7-27 Transfer roll right spring 7-27 I-10 Service Manual - Lexmark T642 | Service Manual - Page 415
pick roll shaft clip 7-15 Parts packet (printhead mounting screw 7-11 Cartridge shipping package, empty 7-69 Parts packet (cable ties 7-3 Nyogel 744 , 000/010 7-33 HPVS/input sensor/toner sensor cable assembly 7-9, 7-29, 7-34 HVPS/input sensor/toner sensor cable assembly 7-37 LVPS to system - Lexmark T642 | Service Manual - Page 416
door assembly 500 sheet 200/210/400/410 7-7 Operator panel outer bezel with Lexmark logo T642 7-3 Operator panel outer bezel with Lexmark logo T644 7-3 Kit, upper front panel button 7-3 Exit/narrow media sensor 7-69 Korean font card 7-69 MarkNet 8050 wireless, non-US 7-69 I-12 Service Manual - Lexmark T642 | Service Manual - Page 417
cover 7-65 Stapler access door switch assembly 7-65 Stapler access cover 7-65 Bellcrank spring-500-sheet option tray 7-44 Duplex assembly.-250-sheet 7-46 Duplex assembly-500-sheet 7-46 250-sheet paper drawer, complete assembly 7-42 Drawer assembly, complete-500-sheet 7-44 Complete option - Lexmark T642 | Service Manual - Page 418
7-67 StapleSmart wheels maintenance kit 7-68 Slide out support 7-47 Plate-250 sheet pass thru 7-43 LVPS network), 400 (Board ID Q0016036 7-31 System board assembly (network), 410 (Board ID Q0016033 7-31 Relocation kit-250/250-sheet printer 7-69 Relocation kit-500/500-sheet printer Service Manual - Lexmark T642 | Service Manual - Page 419
4061-xx0 99A0263 99A0263 99A0272 99A0275 99A0292 99A0415 99A0447 99A0654 99A0658 99A0667 99A0675 99A0675 99A0676 99A0676 99A0677 99A0677 99A0681 99A1785 99A1808 99A1818 99A1929 99A2542 Parts packet, screw (switch spring 7-42 Screw 7-49 Drive shaft-250-sheet 7-42, 7-62 Power takeoff spring 7-42 - Lexmark T642 | Service Manual - Page 420
4061-xx0 I-16 Service Manual - Lexmark T642 | Service Manual - Page 421
Print defects guide Print defects guide Page 1 of 1 Match a set of repeating the defect appears on the printed side of a single-sided print job, replace the toner cartridge before replacing the fuser. Replace the toner cartridge 47.8 mm (1.88 in.) 96.8 mm (3.81 in.) Replace the fuser 88.0 - Lexmark T642 | Service Manual - Page 422
Lexmark +24VDC 4321 4321 123 J18 J20 J15 J14 22 11 Gnd SM Cart 13 12 11 10 13 12 11 10 GND TONER WHEEL CN +5.5VDC -SW +5VDC SW INSENSOR* 9 8 9 8 GND DEV B 7 7 GND 6 5 4 3 Low/Out Sensor 9 10 Auto Compensator Motor Encoder 13 Cartridge 12 11 Sensor Input Sensor 10 9 T102 JC1 Chg
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 |
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Lexmark™ T640, T642, and T644
4061-xx0
• Table of Contents
• Start Diagnostics
• Safety and Notices
• Trademarks
• Index
Lexmark and Lexmark with diamond design are
trademarks of Lexmark International, Inc., registered
in the United States and/or other countries.
Revised September 2
7
, 2005