Brother International HL 1850 Service Manual
Brother International HL 1850 - B/W Laser Printer Manual
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- Brother International HL 1850 | Service Manual - Page 1
Brother Laser Printer SERVICE MANUAL MODEL: HL-1850/1870N O nn cm, Read this manual thoroughly before maintenance work. Keep this manual in a convenient place for quick and easy reference at all times. January 2002 SM-PRN031 - Brother International HL 1850 | Service Manual - Page 2
The brother logo is a registered trademark of Brother Industries, Ltd. Apple, the Apple Logo, and Macintosh are trademarks, registered in the United of International Business Machines Corporation. Microsoft and MS-DOS are registered trademarks of Microsoft Corporation. Windows is a registered - Brother International HL 1850 | Service Manual - Page 3
after-sales service of the laser printer (hereinafter referred to as "this machine" or "the printer"). This information is vital to the service technician to maintain the high printing quality and performance of the printer. This service manual covers the HL-1850/1870N printers. This manual consists - Brother International HL 1850 | Service Manual - Page 4
Requirements for Brother Printer Solution for Windows° 2. UNPACKING 3. INSTALL THE PRINTER 3.1 For All Users 3.1.1 Install the drum unit assembly 3.1.2 Load paper into the paper cassette 3.1.3 Print a test page 3.2 For Windows° Users 3.3 For Macintosh Users 4. PRINTING METHODS 4.1 Printing from the - Brother International HL 1850 | Service Manual - Page 5
Printer status messages 5.4 How to Use the Control Panel 5.5 Control Panel Setting Menu 5.5.1 Information 5.5.2 Paper 5.5.3 Quality 5.5.4 Setup 5.5.5 Print menu 5.5.6 Network 5.5.7 Interface 5.5.8 Reset menu 5.5.9 Set IP address 5.5.10 EEPROM 1.3.8 Reset circuit iii HL-1850/1870N SERVICE MANUAL 2-19 - Brother International HL 1850 | Service Manual - Page 6
sensors 2.3.2 Toner sensors 2.3.3 DX tray sensor / DX paper size sensor 2.3.4 Rear cover sensor 2.3.5 Cassette sensor I Paper empty sensor 2.3.6 Paper eject sensor 2.4 Drum Unit 2.4.1 Photosensitive drum 2.4.2 Primary charger 2.4.3 Transfer roller 2.4.4 Cleaner 2.5 Toner Cartridge 2.6 Print Process - Brother International HL 1850 | Service Manual - Page 7
HL-1850/1870N SERVICE MANUAL 3.10 Process Unit Cover ASSY 3.11 Laser Unit 3.12 Fixing Unit 3.13 Paper Pick-up Roller ASSY 3.14 Feed MP Unit 3.15 Drive Unit 3.16 Low-voltage Power Supply PCB ASSY 3.17 Main PCB ASSY 3.18 Fan Motor / Fan Motor 60 3.19 Base Plate 3.20 Engine PCB ASSY / High- - Brother International HL 1850 | Service Manual - Page 8
Contacts 6.3.1 Drum unit 6.3.2 Printer body & Paper cassette 6-31 6-31 6-32 6-50 6-50 6-50 7. INCORRECT PRINTOUT 6-51 8. NETWORK PROBLEM 6-54 8.1 Installation Problem 6-54 8.2 Intermittent Problem 6-55 8.3 TCP/IP Troubleshooting 6-56 8.4 UNIX Troubleshooting 6-56 8.5 Windows NT/LAN - Brother International HL 1850 | Service Manual - Page 9
16. PRINT SPEEDS WITH VARIOUS SETTINGS 17. HOW TO KNOW DRUM UNIT LIFE & PAGE COUNTER 18. HOW TO USE THE SELF-DIAGNOSTICS TOOLS 19. NVRAM DEFAULT VALUE 20. PAPER CASSETTE INFORMATION (FOR EUROPE ONLY) 21. GUIDELINES FOR LEAD FREE SOLDER (MAIN PCB ASSY) 22. HOW TO REWRITE HL-1850/1870N FLASH ROM - Brother International HL 1850 | Service Manual - Page 10
1968. This means that the printer does not produce hazardous laser radiation. Since radiation emitted inside the printer is completely confined within the protective housing and external covers. the laser beam cannot escape form the machine during any phase of user operation. FDA REGULATIONS (110 - Brother International HL 1850 | Service Manual - Page 11
HL-1850/1870N SERVICE MANUAL IEC 825 (220-240V MODEL ONLY) This printer is a Class I laser product as defined in IEC 825 specifications. The label shown below is attached in countries where required. -1- 1 g 1 g CLASS 1 LASER PRODUCT APPAREL LASER DE CLASSE 1 LASER KlASSE 1PRODUKT } This - Brother International HL 1850 | Service Manual - Page 12
) CAUTION: When the machine during servicing is operated with the cover open, the regulations of VBG 93 and the performance instructions for VBG 93 are valid. CAUTION: In case of any trouble with the laser unit, replace the laser unit itself. To prevent direct exposure to the laser beam, do not - Brother International HL 1850 | Service Manual - Page 13
HL-1850/1870N SERVICE MANUAL CAUTION INVISIBLE LASER RADIATIONWHEN OPENAND INTERLOCK DEFEATED. AVOID DIRECT EXPOSURE TO BEAK CLASS 36 LASER PRODUCT. ADVARSEL USYNLIG LASERSTRALING NAR KABINETLAGETSTARABENT. UNGDADIREKTE UDS/ETTELSE FOR STRALING.KLASSE 36 LASER. VARNING OSYNLIG LASERSTRALNING - Brother International HL 1850 | Service Manual - Page 14
remember when servicing the printer. **Listed below are the various kinds of "WARNING" messages included in this manual. A WARNING Always turn off the power switch and unplug the power cord from the power outlet before accessing any parts inside the printer. WARNING Some parts inside the printer are - Brother International HL 1850 | Service Manual - Page 15
IA-180/187M SERVICE MANUAL XIII - Brother International HL 1850 | Service Manual - Page 16
HL-1850/1870N SERVICE MANUAL CHAPTER 1 GENERAL 1. FEATURES This printer has the following features; High Resolution and Fast Print Speed True 600 x 600 dots / true 300 x 300 dots per inch (dpi) and 2400 x 600 dots per inch (dpi) for graphics with microfine toner and up to 18 pages per minutes (ppm) - Brother International HL 1850 | Service Manual - Page 17
FX-850 and IBM Proprinter XL. When you use DOS application software or Windows® version 3.0 or earlier, you can use any of these emulations to operate the HL-1850/1870N printers. The printers also support autoemulation switching between HP, Brother BR-Script 3 and Epson or HP, BR-Script 3 and IBM - Brother International HL 1850 | Service Manual - Page 18
HL-1850/1870N SERVICE MANUAL 2. OVERVIEW Extension flap Face down output tray Front cover z Multi-purpose tray extension Multi-purpose tray Paper cassette Fig. 1-1 Control panel Cover release button Parallel interface connector Face up output tray Face up tray - Brother International HL 1850 | Service Manual - Page 19
loading A4 or Letter-size paper from the standard paper cassette.) Print media Toner cartridge Life expectancy: 6,500 pages/cartridge (when printing A4 or Letter-size paper at 5% print coverage) Developer Drum unit Life expectancy: 20,000 pages/drum unit *NOTE: Print speed varies depending on - Brother International HL 1850 | Service Manual - Page 20
HL-1850/1870N SERVICE MANUAL 3.2 Functions CPU Emulation Printer driver Interface Memory Control Panel Diagnostics Fujitsu MB86834 100MHz Brother Printing Solution for Windows® Automatic emulation selection among HP LaserJet (PCL level 6), Brother BR-Script Level 3, EPSON FX-850 or IBM Proprinter - Brother International HL 1850 | Service Manual - Page 21
(average): Standing by: Sleep*: 410 W or less 70 W or less 9 W or less (for HL-1850) 10 W or less (for HL-1870N) Printing: 50dB A or less Standing by: 30dB A or less Temperature Operating: 10 to 32.5°C (50 to 90.5°F) Non operating: 0 to 40°C (38 to 104°F) Storage: -20 to 40°C (-4 to - Brother International HL 1850 | Service Manual - Page 22
HL-1850/1870N SERVICE MANUAL 3.4 Network Type / Speed Protocols Management Firmware update Supplied software 10/100 Base TX Ethernet Automatic negotiation TCP/IP (RARP, BOOTP, DHCP, NetBIOS, WINS, LPR/LPD, Port9100, POP3/SMTP, SMB, User definable port, IPP, FTP, TELNET, SNMP, HTTP, TFTP), Netware - Brother International HL 1850 | Service Manual - Page 23
g/m2 to 161 g/m2 (28 to 43 lbs.) Upper paper tray Multipurpose tray Optional lower tray Duplex printing Select the paper type from the printer driver Plain paper Plain paper Bond paper Thick paper or thicker paper Transparency Up to 10 sheets Only A4 or Letter size Transparencies Label - Brother International HL 1850 | Service Manual - Page 24
HL-1850/1870N SERVICE MANUAL Caliper Moisture content 0.08 to 0.13 mm (0.003 to 0.005 in.) 4% to 6% by weight Cut sheet Basis weight 60 to 161 g/m2 (16 to 43 lb.) Caliper • 0.08 to 0.2 mm (0.003 to 0.008 in.) Moisture content 4% to 6% by weight - Brother International HL 1850 | Service Manual - Page 25
printed face of the paper downwards. Delivery with the printed face of the paper upwards. (3) We recommend the following print methods (output tray) for each paper media type. Media type Plain paper Thick paper Recycled paper Transparency Label Envelope Card Paper output Face down Face up 1-10 - Brother International HL 1850 | Service Manual - Page 26
HL-1850/1870N SERVICE MANUAL 3.6 3.6.1 Printable Area PCL5e/EPSON/IBM emulation The figure below shows the printable area each emulation guarantees when printing on Portrait and Landscape. Portrait G- E.G- ► I G•• 4 C.. 4 F•• A E•• D.. B.. G•• B.. D.. F.. • 1r F•• Physical page - Brother International HL 1850 | Service Manual - Page 27
CHAPTER 1 GENERAL The table below shows the printable areas when printing on Portrait for each paper size. Size Letter Legal Executive A 4 A 5 A 6 B 5 (JIS) B 5 11.0" (3,300 dots) 355.6 mm 14.0" (4,200 dots) 266.7 mm 10.5" (3,150 dots) 297.0 mm 11.69" (3,507 dots) 210.0 mm 8.27" (2,480 dots) 148.5 - Brother International HL 1850 | Service Manual - Page 28
Landscape G.. G- C- I A - HL-1850/1870N SERVICE MANUAL E.. D.. B.. G.B D F F.. Physical page.. Printable area.. Logical page.. Physical page lengths. Maximtrn logical page length.. D istance from edge of physical page to edge of logical page.. 1-13 - Brother International HL 1850 | Service Manual - Page 29
The table below shows the printable areas when printing on Landscape for each paper size. Size A B C D E F G Letter Legal Executive A 4 A 5 A 6 B 5 (JIS) B 5 (ISO) B 6 COM10 MONARCH C 5 DL 279.4 mm 11.0" (3,300 dots) 355.6 mm 14.0" (4,200 dots) 266.7 mm 10.5" (3,150 dots) 297.0 mm 11.69 - Brother International HL 1850 | Service Manual - Page 30
HL-1850/1870N SERVICE MANUAL CHAPTER 2 INSTALLATION AND BASIC OPERATION 1. CONDITIONS REQUIRED FOR INSTALLATION 1.1 Power Supply • The source voltage must stay within ±10% of the rated voltage shown on the rating plate. • The power cord, including extensions, should not exceed 5 meters (16.5 feet - Brother International HL 1850 | Service Manual - Page 31
CHAPTER 2 INSTALLATIONAND BASIC OPERATION 2. UNPACKING When unpacking the printer, check to see that all of the following components are included in the carton. Paper cassette Printer Drum unit (with Toner cartridge included) a CD-ROM Fig. 2-1 NOTE: Components may vary depending on the country. - Brother International HL 1850 | Service Manual - Page 32
HL-1850/1870N SERVICE MANUAL 3. INSTALL THE PRINTER You need to implement hardware setup and driver installation to use the printer. Firstly, identify the Operating System on your computer. (Windows 95/98/Me, Windows NT® 4.0, Windows° 2000/XP and Macintosh)Then, purchase the appropriate interface - Brother International HL 1850 | Service Manual - Page 33
to distribute the toner evenly inside the assembly. 4' Fig. 2-2 Install the drum unit assembly into the printer. Close the front cover. Fig. 2-3 3.1.2 Load paper into the paper cassette (1) Pull the paper cassette completely out of the printer. While pressing the paper guide release lever, slide - Brother International HL 1850 | Service Manual - Page 34
HL-1850/1870N SERVICE MANUAL Load paper into the paper cassette. Check that the paper is flat in the tray and below the maximum paper mark. I Re-install the paper cassette into the printer. Fig. 2-5 3.1.3 Print a test page (1) Make sure the printer power switch is off. Connect the AC power cord - Brother International HL 1850 | Service Manual - Page 35
BASIC OPERATION Follows the instructions for your operating system and interface cable type. 3.2 For Windows® Users Connect the printer to the PC & install the driver For parallel interface cable users (1) Click "Connect the Interface cable and install the printer driver / utilities". (2) Select the - Brother International HL 1850 | Service Manual - Page 36
For Windows® 2000/XP users only Click Start, Setting and then Printers. - - Fig. 2-7 Select the Brother HL-1850/1870N series (copy2) icon. *. • I-IL-1850/1870NSERVICE MANUAL Fig. 2-8 Click on the File menu, and then select Set as Default printer. The setup is now complete. For network users • For - Brother International HL 1850 | Service Manual - Page 37
Driver Deployment Wizard software to automate the installation of Brother networked printers in a TCP/IP environment. The Wizard can create an Executable file that can be sent to other network users, when run, the Executable file installs the appropriate printer driver and network printing software - Brother International HL 1850 | Service Manual - Page 38
HL-1850/1870N SERVICE MANUAL 4. For Brother Peer-to-Peer network printer users (LPR-recommended Peer-to-Peer printing method) Configuring the LPR port (1) Select "LPR (Recommended)" and then click the Next button. (2) Enter a unique port name (ex. BLP1), and then click - Brother International HL 1850 | Service Manual - Page 39
to 9.2 Users; Open the Applications.( Mac® OS 9) folder. Open the Utilities folder. (7) Open the Desktop Printer Utility icon. (8) Select Printer (USB), and then click the OK button. (9) Click the Change.. .button in PostScriptTM Printer Description (PPD) file. Select Brother HL- 1850/1870N series - Brother International HL 1850 | Service Manual - Page 40
HL-1850/1870N SERVICE MANUAL For network users Connect the printer to the Macintosh & install the BR-Script PPD file (1) Double click the BR-Script PPD Installer icon and then follow the instructions on the screen. (2) Turn the printer power switch off. (3) Connect the cable to the printer, and then - Brother International HL 1850 | Service Manual - Page 41
: • For correct printing, the same paper size must be selected from within the software application as the paper in the tray. • If the application software does not support paper size selection in its print menu, you can change the paper size on the printer's control panel under the PAPER menu. For - Brother International HL 1850 | Service Manual - Page 42
touches the back of the tray and remains below the limit mark. HL-1850/1870N SERVICE MANUAL Fig. 2-15 NOTE: Note the following when placing paper on the multi-purpose tray: • If the paper to be printed on weighs more than 135 g/m2 (36 lbs), use the face up output tray. • Insert the leading edge of - Brother International HL 1850 | Service Manual - Page 43
same time in the paper tray because it may cause paper jams or misfeeds. • Do not print envelopes using duplex printing. • If the application software does not support paper size selection in its print menu, you can change the paper size on the printer's control panel under the PAPER menu. For more - Brother International HL 1850 | Service Manual - Page 44
HL-1850/1870N SERVICE MANUAL NOTE;• Note the following when placingpaper on the multipurpose tray;• • Insert the leading edge of the paper first andpush it gently into the tray. • The top of the paper stack must be under the guides that are on both sides of tray. The maximum thickness is 11mm (or - Brother International HL 1850 | Service Manual - Page 45
0 CHAPTER 2 INSTALLATIONAND BASIC OPERATION CAUTION: Do not touch transparencies that have just been printed because they are very HOT. 2-16 - Brother International HL 1850 | Service Manual - Page 46
HL-1850/1870N SERVICE MANUAL When printing on labels or transparencies, follow the steps below; (1) Open the multi-purpose tray. (2) Unfold the multi-purpose tray extension. For printing on labels, open the face up output tray. When printing on transparencies, print to the face down output tray. / - Brother International HL 1850 | Service Manual - Page 47
them and close the face up output tray. 4.4 Printing on Both Sides of the Paper (Duplex Printing) The supplied printer drivers for Windows® 95/98/Me, Windows® NT 4.0, Windows® 2000/XP supports automatic duplex printing. Guidelines for duplexprinting: • If the paper is thin, it may wrinkle. • If - Brother International HL 1850 | Service Manual - Page 48
HL-1850/1870N SERVICE MANUAL if the paper adjustment lever for duplex printing is not correctly set for the paper size, paper jams may occur and the printing will be out of position on the paper. - Brother International HL 1850 | Service Manual - Page 49
using the control panel, the printer will load paper only form the multipurpose tray. NOTE: Note the following when feeding paper manually: • If the application software supports a manual feed selection in the print menu, it can be selectedin that software. The software command setting overrides the - Brother International HL 1850 | Service Manual - Page 50
HL-1850/1870N SERVICE MANUAL Control Panel Operation There are one LED and 7 switches on the control panel. The LED and LCD display indicate the printer status, and pressing the switches enables several functions in the printer. The display also shows the current printer status. When you use the - Brother International HL 1850 | Service Manual - Page 51
Go Job Cancel Reprint + Set Back Function Exit from the control panel menu. Reprint settings and Error messages. Pause / Continue printing. Stop and cancel the printer operation in progress. Select the reprint menu. (1-999) Move forward and backward through menus. Move forward and backward through - Brother International HL 1850 | Service Manual - Page 52
HL-1850/1870N SERVICE MANUAL 5.2.3 Reprint switch If you want to reprint a document that has just been printed, you can reprint cancel reprinting, press the Job Cancel switch. • If the printer does not have enough memory to spool the print job, it prints only the last page. • Pressing the - or + - Brother International HL 1850 | Service Manual - Page 53
have sent it for printing, to print the document you must use the control panel of the printer or connect to the printer using a web browser. When you want to delete the spooled data, you can carry out this operation on the control panel or in the web based management software. NOTE: • If there is - Brother International HL 1850 | Service Manual - Page 54
HL-1850/1870N SERVICE MANUAL Operations forprinting secure data 4, Press the Reprint switch. LAST JOB If there is no data. Press + or - NO DATA STORED SECURE Press Set USER XXXXXXX Press + or - to select the user name. Press the Set switch to set the user name. JOB XXXXXXX Press + or - to - Brother International HL 1850 | Service Manual - Page 55
take the printer off-line, the display changes to show the selected emulation. If any problems occur, the display shows the corresponding operator call, error, or service call message to prompt you to take an action. For more information about these messages, see CHAPTER 6 TROUBLESHOOTING'. 2-26 - Brother International HL 1850 | Service Manual - Page 56
HL-1850/1870N SERVICE MANUAL PR2001022 5.3.1 Backlights The backlight of the LCD shows the current printer status with the different colors and the light indications (on, off and blinking). Signal Off Green (General) Red (Error) Orange (Setting) Status The printer is in sleep status. Warming up - Brother International HL 1850 | Service Manual - Page 57
that are displayed during normal operation: Printer Status Message READY PROCESSING SLEEP PRINTING SELF TEST PAUSE NOW INITIALIZING WARMING UP MEMORY SIZE=XX MB JOB CANCELING RESOLUTION ADAPT PRESS SET TO PRINT RESET TO FACTORY SETTING Meaning Ready to print. Busy processing data. In sleep status - Brother International HL 1850 | Service Manual - Page 58
HL-1850/1870N SERVICE MANUAL 5.4 How to Use the Control Panel The followings are the basic steps when operating for operation: When turning the `MP FIRST' setting on Choose this setting to load paper from the multi-purpose tray first. READY 1 Press the + switch. Press the + or - switch to scroll - Brother International HL 1850 | Service Manual - Page 59
UP' in this Chapter. PRINT MENU: For more information, see subsection 5.5.5 `PRINT MENU' in this Chapter. NETWORK: For more information, see subsection 5.5.6 `NETWORK ' in this Chapter. INTERFACE: For more information, see subsection 5.5.7 `INTERFACE' this Chapter. RESET MENU: For more information - Brother International HL 1850 | Service Manual - Page 60
date (only netword users) NET VER=#### Network firmware version NET DATE ##/##/## Network date RAM SIZE=###MB The size of memory in this printer. PAGE COUNTER REMAIN DRUM REMAIN PF KIT]. REMAIN PF KIT2 REMAIN FUSER REMAIN LASER 5.5.2 Paper Setting Menu SOURCE TRAY PRIORITY MP FIRST - Brother International HL 1850 | Service Manual - Page 61
Setting Menu RESOLUTION HRC TONER SAVE DENSITY Description =300 / 600 / HO1200 You can choose a print resolution of 300, 600 or HO1200. =OFF / LIGHT/ MEDIUM/DARK HRC: High Resolution Control offers improved print quality of characters and graphics that conventional laser printers cannot attain with - Brother International HL 1850 | Service Manual - Page 62
5.5.5 Print menu HL-1850/1870N SERVICE MANUAL PR2001022 Setting Menu MEDIA TYPE PAPER COPIES ORIENTATION PRINT POSITION AUTO FF=OFF FF SURPRESS HP LASERJET Description =PLAIN PAPER / TRANSPARENCIES / THIN PAPER / THICK PAPER / THICKER PAPER / BOND PAPER / ENVELOPES / ENV.THICK / ENV.THIN Set - Brother International HL 1850 | Service Manual - Page 63
Line feed and carriage return occur when the printer position reaches the bottom margin. Description LEFT PRINT AUTO LF =OFF AUTO MASK LEFT MARGIN RIGHT MARAGIN TOP MARGIN =#### Set the left margin at column 0 to 126 columns at 10 cpi. =#### Set the right margin at column 10 to 136 columns at 10 - Brother International HL 1850 | Service Manual - Page 64
HL-1850/1870N SERVICE MANUAL BOTTOM MARGIN LINES =#### Set the bottom margin a distance from the top edge of the paper: 0, 0.33, 0.5, 1.0, 1.5 or 2.0" Factory setting=0.33 =#### Set the number of lines per page from 5 to 128 lines. 2-35 - Brother International HL 1850 | Service Manual - Page 65
=????? PC-8 / .. . Set the symbol set or the character set. Print code table. =OFF /ON ON: CR4CR-FLF OFF: CR4CR =OFF /ON =#### Set the left margin at column 0 to 126 columns at 10 cpi. =#### Set the right margin at column 10 to 136 columns at 10 cpi. =#### Set the top margin a distance from the top - Brother International HL 1850 | Service Manual - Page 66
APPLETALK NETBEUI DLC/LLC BANYAN LAT NETBIOS/IP ENET HL-180/1870N SERVICE MANUAL PR2001022 Description Sub-setting Menu Description TCP/IP ENABLE Level 1:5:15 Increase or decrease the input buffer capacity. RESTART PRINTER? When using the parallel interface Sub-setting Menu Description HIGH - Brother International HL 1850 | Service Manual - Page 67
2 INSTALLATIONAND BASIC OPERATION 5.5.8 Reset menu Setting Menu RESET PRINTER FACTORY RESET Description Resets the printer and restores all printer settings - including command settings - to settings you have previously made with the control panel switches. Resets the printer and restores all - Brother International HL 1850 | Service Manual - Page 68
HL-1850/1870N SERVICE MANUAL 5.5.10 About emulation modes This printer has the following emulation modes. HP Lser.let Mode The HP LaserJet mode (or HP mode) is the emulation mode in which this printer emulates the Hewlett-Packard LaserJet laser printer. Many software applications support the RESET - Brother International HL 1850 | Service Manual - Page 69
CHAPTER 2 INSTALLATIONAND BASIC OPERATION password and IP address information) hold down the Network Test Button of the Network board (NC-4100h) for more than 5 seconds. 2-40 - Brother International HL 1850 | Service Manual - Page 70
HL-1850/1870N SERVICE MANUAL Mode PAPER QUALITY SETUP PRINT MENU Menu SOURCE TRAY PRIORITY MP FIRST MP SIZE MANUAL FEED TRAY1 SIZE TRAY2 SIZE DUPLEX RESOLUTION HRC TONER SAVE DENSITY LANGUAGE LCD DENSITY POWER SAVE TIME AUTO CONTINUE LOCK PANEL REPRINT EMULATION KEEP PCL MEDIA TYPE PAPER COPIES - Brother International HL 1850 | Service Manual - Page 71
AND BASIC OPERATION Mode PRINT MENU Menu HP LASER JET EPSON FX- 850 IBM PROPRINTER BR-SCRIPT Factory Setting FONT NO.=59 FONT PITCH / POINT=10.00 / 12.00 TOP MARGIN=#### BOTTOM MARGIN=#### LINES=#### FONT NO.=59 FONT PITCH / POINT=10.00 / 12.00 SYMBOL / CHARACTER SET =PCB AUTO LF=OFF AUTO CR - Brother International HL 1850 | Service Manual - Page 72
Mode NETWORK HL-1850/1870N SERVICE MANUAL Menu TCP/IP NETWARE APPLETALK NETBEUI DLC/LLC BANYAN LAT NETBIOS/IP ENET Factory Setting TCP/IP ENABLE=ON IP METHOD=AUTO IP ADDRESS=192.0.0. - Brother International HL 1850 | Service Manual - Page 73
because the fan running conditions are defined as follows; 1) The fan runs for 10 minutes whenever printing finishes. 2) The fan runs while the printer is in ready status. 3) The fan runs for at least 5 minutes after the printer goes into sleep mode. (EX;• If the timeout is 5 minutes, the fan will - Brother International HL 1850 | Service Manual - Page 74
HL-1850/1870N SERVICE MANUAL NETWORK BOARD OPERATION Installing the network board enables you to use the printer in the TCP/IP, IPX/SPX, AppleTalk, DLC/LLC, Banyan VINES, DEC LAT and NetBEUI environments. Also, useful utilities such as BR-Admin32 and network printing software for the administrator - Brother International HL 1850 | Service Manual - Page 75
with the two screws removed in (3). (8) Close the interface cover. (9) Plug the power cord into the AC outlet, and then turn on the power switch. Print configuration page Press the network test button for less than 5 seconds to - Brother International HL 1850 | Service Manual - Page 76
6.2 Functions 6.2.1 LED functions HL-1850/1870N SERVICE MANUAL A-LED (Green) F-LED (Orange) L-LED (Green) YYYY rcl as the print server receives or transmits data. 6.2.2 Factory default setting If you wish to reset the print server back to its default factory settings (resetting all information - Brother International HL 1850 | Service Manual - Page 77
panel) L 1- Laser unit Drive block (DC motor) Paper tray unit Paper cassette Drum unit • Transfer block • • Drum • " Paper dust cleaner block e Developing block • Toner cartridge Image generation system L MP tray Fixing unit Duplex printing unit • • Paper eject block • Paper feed system - Brother International HL 1850 | Service Manual - Page 78
Main PCB Block Diagram HL-1850 HL-1870N Fig. 3-2 shows the block diagram of the main PCB of the HL-1850 and the HL-1870N printers. ASIC Reset Circuit CPU Core (MB86834) BUS INT Oscillator (48MHz) Program + Font ROM 10 Mbytes Network Program (2.0 Mbytes) RAM (HL-1650: 8.0 Mbytes) (HL-1670N: 16 - Brother International HL 1850 | Service Manual - Page 79
main PCB, see APPENDIX 2. to 7. `MAIN PCB CIRCUIT DIAGRAM, HL-1850/1870N in this manual. 1.3.1 ASIC HL-1850 HL-1870N A Fujitsu 32bit RISC CPU, MB86834 (SPARC lite) is built in the ASIC. While the CPU is driven with a clock frequency of 48 MHz in the user logic block, it itself runs at 96 MHz, which - Brother International HL 1850 | Service Manual - Page 80
CHAPTER 3 THEORY OF OPERATION (2) USB interface Stores the data received from the PC into DRAM as controlled by the DMA controller. The transmission speed is 12Mbps. ,00 ( CCM JL: 4j7 - t V. aeLe ct. oe Fun:. Z73 :I/ a 0 is Mot e, g0-s- = a=41 :a Pvt.e. a'uxTh o M He VOI-,45 .03 I - Brother International HL 1850 | Service Manual - Page 81
CHAPTER 3 THEORY OF OPERATION Two 64 Mbits ROMs (x 16 bit) are fitted. Ellat to NI W to i 3t. A 5i A(Al; A(A(A O OO ONto. 0.-,E1Virn tq AAA Nt A 5 CJ~7tl n1 RID 5 5 ;O44M 51,1 A ALA A01,501,50K O 13;i,fl - Brother International HL 1850 | Service Manual - Page 82
1.3.3 Flash ROM HL-1850 HL-1850/1870N SERVICE MANUAL Two 8 Mbits flash ROMs (x 16 bit) are fitted. 0'14121 '4213131 .14 '001161 m161 =DI 033131 '.00401 ' fonde 00111 Mc , 37 U92- 43 3.2 p 4,4 nci3 ,0 , 4 40 42 . - Brother International HL 1850 | Service Manual - Page 83
CHAPTER 3 THEORY OF OPERATION 1.3.4 SDRAM HL-1850 A 64M-bit SDRAM (x 32 bits) is used as the RAM. Kam 3- 93 1- .AME,A vro-I 41:0- ' Au 03- 73 05-22 Acnriel / 2:003 m - 330- 0 vsso-73 YEEFEA EEC , Z34 [E3 10 ^S72 oao COI o33 m3 CO4 o 033 o37 COO Dais 73 30 no Oa no nO no 30 mis nom nom - Brother International HL 1850 | Service Manual - Page 84
HL-1870N Two 64M-bit SDRAMs (x 16 bits) are used as the RAM. ca. 'cr-ra 0054 27 1 2 • 33 15.6. 11(0- 3 ,a E 1057-12 @L =9 - 49 0016611' pa1,1111' 01ic1t21~ I i3).' 01ialt. ' I i6) Op Op As) pzi..01s 017.181 p..93 caw.. WM.) car..22)' Car1.1231' OarAl.1' tsmi..)' HL-1850/1870N SERVICE MANUAL - Brother International HL 1850 | Service Manual - Page 85
3 THEORY OF OPERATION 1.3.5 Optional RAM HL-1850 • HL-1870N A 32bit (100 pin) DIMM can be CE/0- 01 -VN - liG ACIR,Za- 21 Bil/Al2 WalAIS AlrelbtlbA415 AWIRLIn/A14 0.1110.13 AB 6161 Fig. 3-10 Qa KID vm um aQA YID am aQf Inn Ats 1EB MSS USE MEI s-uvAeSse -4evatta ":Utr k taiF aum > T. - Brother International HL 1850 | Service Manual - Page 86
HL-1850/1870N SERVICE MANUAL 1.3.6 PCI bus HL-1850 HL-1870N The interface of the PCI bus is PCI specification revision 2.2 compliant. 9,11 xow, PAosx , kvse,-.3 US - „....,"VIII IV IV. I-I-:9-1. ''''' AL tae . 193 „...0 99,1 , '3 + our; Ise - Brother International HL 1850 | Service Manual - Page 87
>fs > Cc vcC 6 4 U vSS 0 Cz SCL AO 5 SDA Al 7 TEST A2 M24C64- WMN6 Fig. 3-12 1.3.8 Reset circuit HL-1850 HL-1870N The reset IC is a S-80928ANMP. The reset voltage is 2.7V (typ.) and the LOW period of reset is 260ms (typ.) VD83 104 (3_, C9 C9 473 2 U10 VDD 4 1ccrs- - Brother International HL 1850 | Service Manual - Page 88
HL-1850/1870N SERVICE MANUAL 1.3.9 Engine I/O HL-1850 HL-1870N Fig. 3-19 shows the engine interface 600S 1 3. 3V 3 TXD 4 < RXD 5 RESET CN7 6 5V L2 , 3,4 - 'COIL BLM112,6015 5 BLM111.600S 2 < ov Fig. 3-14 1.3.10 Panel VO HL-1850 HL-1870N Fig. 3-15 shows the panel interface circuit. The - Brother International HL 1850 | Service Manual - Page 89
• Duplex cover sensor • Lower cassette exit sensor • Paper eject sensor • Fixing unit cover sensor • Multi-purpose tray paper exit sensor For the circuit diagram of the engine PCB, see APPENDIX 8. and 9. `ENGINE PCB CIRCUIT DIAGRAM, HL-1850/1870N' in this manual. 1.5 BR-net PCB The BR-net PCB is - Brother International HL 1850 | Service Manual - Page 90
diagram of the low-voltage power supply PCB, see APPENDIX 11. or 12. `LOWVOLTAGE POWER SUPPLY PCB CIRCUIT DIAGRAM' in this manual. Fuse Lightning Surge Absorber Fuse Heater Circuit (Heater) Thermal Fuse Lamp Feedback Line Filter Rectifier Oscillator 24V Regulation Circuit 3.3V Regulation - Brother International HL 1850 | Service Manual - Page 91
HL-1850/1870N SERVICE MANUAL 1.6.2 manual. 24VI I I I I I i 411) I Current Regulator 31IE B1 Voltage Regulator VR21 Current Regulator 311i( . B61 Q63 Voltage Regulator ] II[ B81 Q82 Supply Roller 0 Transfer Roller Cleaning Brush Development Roller Photosensitive Drum I --r--i Corona Unit - Brother International HL 1850 | Service Manual - Page 92
2.1 Overview of Printing Mechanism Heat roller Second eject roller Rear cover Duplex outer guide 1 1 isL2) Paper guide First eject roller FIXING UNIT Pressure roller DUPLEX TRAY Corona wire LASER UNIT •0. 4 Scanner motor Blade Supply roller O T 4 DRUM UNIT Toner sensor Paper feed pinch - Brother International HL 1850 | Service Manual - Page 93
HL-1850/1870N SERVICE MANUAL Network Board (HL-1670N) Panel PCB Laser Unit H Laser Polygon Motor Main PCB Low-Voltage Power Supply PCB Fixing Unit Halogen Lamp LT Front Connector LT PCB (Option) LT Solenoid LT Paper Registration Sensor LT Paper Empty Sensor Engine PCB Front Registration Sensor - Brother International HL 1850 | Service Manual - Page 94
a specified time, and the paper top position reaches the paper feed roller so that the paper skew is adjusted. Then, the solenoid is turned off, the paper feed roller starts turning, and the paper is fed to the transfer block in the drum unit. Photosensitive drum , ± eG o + + CD 0 Transfer - Brother International HL 1850 | Service Manual - Page 95
from the duplex tray to the path through the paper feed roller and the transfer roller to the transfer block in the drum unit again for process of printing on the back of sheet. Second eiect roller Paper cover } Paper outer guide # + m Heat roller Photosensitive drum Paper guide First eject - Brother International HL 1850 | Service Manual - Page 96
arm C MP sensor PCB assy HL-1850/1870N SERVICE MANUAL Fig. 3-24 2.3.2 Toner sensors Detects if there is toner in the toner cartridge. The toner sensor at the left side emits light through the window on the left side of the toner cartridge, then the toner sensor at the right side receives - Brother International HL 1850 | Service Manual - Page 97
HL-1850/1870N SERVICE MANUAL 2.3.3 DX tray sensor I DX paper size sensor The DX tray sensor detects if the DX tray in installed, and the DX tray size sensor detects if the correct size of paper is selected. I DX sensor PCB assy Fig. 3-26 2.3.4 Rear cover sensor Detects opening and closing of - Brother International HL 1850 | Service Manual - Page 98
empty sensor Detect if the paper cassette is installed. They also detect if there is paper in the paper cassette. I ti Cassette sensor PCB assy Fig. 3-28 2.3.6 Paper eject sensor Detects if paper is ejected from the fixing unit. Fixing unit I Feed MP unit 48. I Eject sensor PCB assy Fig - Brother International HL 1850 | Service Manual - Page 99
HL-1850/1870N SERVICE MANUAL 2.4 2.4.1 Drum Unit Photosensitive drum Generates the latent electrostatic image and develops the image on the drum surface. 2.4.2 Primary charger Forms a uniform charge on the drum surface. (1) Corona wire Generates the ion charge on the drum. (2) Grid Spreads the - Brother International HL 1850 | Service Manual - Page 100
to the light emitted from the laser unit. Laser detector Laser diode Drum Paper Laser beam --•-t --- f 0 lens 0 Polygon mirror Laser beam ••e e e I:6-i-•6•..-6i Lens Motor Fig. 3-31 The area exposed to the laser beam is the image to be printed. The surface potential of the exposed - Brother International HL 1850 | Service Manual - Page 101
HL-1850/1870N SERVICE MANUAL 2.6.3 Developing Developing causes the toner to be attracted to the electrostatic image on the drum so as to transform it into a visible image. The developer consists of a non-magnetic toner. The development roller is made of conductive rubber and the supply roller ( - Brother International HL 1850 | Service Manual - Page 102
CHAPTER 3 THEORY OF OPERATION 2.6.5 Fixing stage The image transferred to the paper by static electricity is fixed by heat and pressure when passing through the heat roller and the pressure roller in the fixing unit. The thermistor keeps the surface temperature of the heat roller constant by - Brother International HL 1850 | Service Manual - Page 103
HL-1850/1870N SERVICE MANUAL CHAPTER 4 DISASSEMBLY AND RE-ASSEMBLY 1. SAFETY PRECAUTIONS To avoid creating secondary problems by power outlet before accessing any parts inside the printer. (2) Some parts inside the printer are extremely hot immediately after the printer is used. When opening - Brother International HL 1850 | Service Manual - Page 104
2. DISASSEMBLY FLOW HL-1850/1870N SERVICE MANUAL AC CORD 2 DRUM UNIT I 11 LASER UNIT 3 PAPER CASSETTE I 12 FIXING UNIT 4 NETWORK BOARD 5 TOP COVER 26 III,• EXIT ROLLER UNIT 6 DX FEED ASSY I 7 13 PAPER PICK-UP ROLLER ASSY 14 ir FEED MP UNIT I 15 DRIVE UNIT III(A) 24 PAPER FEED ROLLER - Brother International HL 1850 | Service Manual - Page 105
printer parts. 3.1 AC Cord (1) Disconnect the AC cord from the printer AC inlet. •\ -----_,, 0,0,' e ------- Printer 1 a AC cord AC inlet Fig. 4-1 3.2 Drum Unit (1) Press the cover release button, and open the process unit cover ASSY and remove the drum unit from the printer. Drum unit - Brother International HL 1850 | Service Manual - Page 106
the MP cover and pull out the paper cassette from the printer and remove the paper from the cassette. MP cover Paper cassette Fig. 4-3 (2) Remove the pad holder ZLh ASSY JPN by pulling it upwards, then remove the separation pad spring 350 from the paper cassette. Pad holder ZLh ASSY JPN Separation - Brother International HL 1850 | Service Manual - Page 107
film must not be reused after it has been removed. Always replace it with a new one. • The screw securing the paper cassette cover indicated RED in the figure above is very special. When disassembling/re-assembling the screw, you need a special screw driver. Refer to the parts reference list. 4-6 - Brother International HL 1850 | Service Manual - Page 108
screws. (9) Unhook the catches of each side guide, then press the lock lever towards the front of the cassette to release the pressure plate. Step (9) Side guide L Taptite, cup B M2.6x5 Side guide rack Taptite, cup B M2.6 ti (catches) Paper cassette (Back side) (CO Fig. 4-8 Lock lever - Brother International HL 1850 | Service Manual - Page 109
CHAPTER 4 DISASSEMBLY AND RE-ASSEMBLY (10) Turn the cassette the correct way up and slide the two paper guides to the center of the cassette. (11) Remove the side guides Right and Left from the paper cassette. Side guide R Side guide L 2 1 Paper cassette Fig. 4-9 (12) Unhook the two catches - Brother International HL 1850 | Service Manual - Page 110
If the pressure plate is deformed, paper feeding problems may occur. (14) Remove the Paper cassette , = Lock lever Fig. 4-11 NOTE: When re-assembling the lock lever, insert it upwards from underneath the cassette and rotate it until the two catches lock into place.. (16) Slide the rear paper guide - Brother International HL 1850 | Service Manual - Page 111
aligned so that the wide end of the racks are in line with the inside edge of the paper guide release slots in the cassette before refitting the spring and gear. • When replacing/re-assembling the paper cassette, remove the old grease and apply a suitable amount of grease onto both sides of the - Brother International HL 1850 | Service Manual - Page 112
AND RE-ASSEMBLY (20) Remove the pan B M3x8 Taptite screw to remove the tray lock lever from the paper cassette. (21) Unhook the four catches to remove the paper tray rear from the paper cassette. B M3x8 Tray lock lever Paper tray rear (catch) ti (catch) Paper cassette Fig. 4-15 (catches) - Brother International HL 1850 | Service Manual - Page 113
AND RE-ASSEMBLY 3.4 Network Board (For HL-1870N only) (1) Open the access cover by sliding it to the backward. (2) Loosen the two bind S M3x8 Taptite screws to remove the PCB access plate. PCB access plate Access cover 0 0 Taptite, bind S M3x8 Fig. 4-16 Printer (3) Remove the two bind S M3x8 - Brother International HL 1850 | Service Manual - Page 114
the top cover from the printer. Shoulder screws Shoulder screws Top cover Side cover R Rear cover Side cover L Fig. 4-18 Process unit cover ASSY (5) Remove the paper stopper and the paper stopper S from the top cover. Top cover . o. Paper stopper S N Paper stopper Fig. 4-19 4-13 - Brother International HL 1850 | Service Manual - Page 115
CHAPTER 4 DISASSEMBLY AND RE-ASSEMBLY (6) Turn the top cover upside down and remove the three cup B M3x8 Taptite screws from the top cover. (7) Turn the top cover the correct way up to remove the panel cover ASSY from the top cover. Taptite,cup B M3x8 N 4.) CO Panel cover ASSY Top cover (Back side - Brother International HL 1850 | Service Manual - Page 116
CHAPTER 4 DISASSEMBLY AND RE-ASSEMBLY (10) Remove the LCD holder from the panel cover ASSY and remove the back light PCB ASSY by releasing two hooks from ASSY. (11) Remove the - Brother International HL 1850 | Service Manual - Page 117
CHAPTER 4 DISASSEMBLY AND RE-ASSEMBLY (12) Remove the panel light guide, and then remove the key from the panel cover. Panel light guide Panel cover key I' Fig. 4-24 (13) Remove the key top A and the key top B form the key. Key top B Key top A Key Fig. 4-25 - Brother International HL 1850 | Service Manual - Page 118
(1) Close the rear cover and remove the DX feed ASSY from the printer. Rear cover el of DX feed ASSY Fig. 4-26 (2) Remove the bind M3x4 screw to remove the ground wire cover and the ground wire from the paper guide upper ASSY, and then remove the ground wire from the ground wire - Brother International HL 1850 | Service Manual - Page 119
down to assist the roller holder being released. (boss) Roller holder ii Paper guide upper ASSY Fig. 4-28 Pressure roller (5) Turn the DX feed ASSY rollers using a pair of tweezers by releasing the boss from the left guide plate ASSY. Remove the two pressure rollers from the side regist roller - Brother International HL 1850 | Service Manual - Page 120
side of the ASSY using a pair of long nose pliers. NOTE: "ERROR 41" may occur if the left guide springs are not fitted correctly. See subsection 2.2 `Service Calls' in CHAPTER 6 for more information on "ERROR 41". Taptite, bind B M3x8 Guide plate stopper (hook) DX feed ASSY (Back side) Left - Brother International HL 1850 | Service Manual - Page 121
AND RE-ASSEMBLY (10) Fig. 4-31Remove the side regist roller from the DX feed ASSY and then remove the T-belt B40S2M142 and the T-belt B40S2M224. DX feed ASSY Side regist roller T-belt B40S2M224 /N N T-belt B40S2M142 Fig. 4-32 (11) Remove the DX paper actuator and the guide actuator from the DX - Brother International HL 1850 | Service Manual - Page 122
on the right and left sides of the DX rear chute to release the DX outer chute ASSY from the rear cover. hook) Rear cover R Printer DX rear chute 1 DX outer chute ASSY Rear cover Rear cover L Fig. 4-34 (3) Remove the DX outer chute ASSY from the - Brother International HL 1850 | Service Manual - Page 123
2 from the DX outer chute. Flap 2 Frap 2 spring .0 e J/ "0. ook) DX outer chute Fig. 4-36 (5) Remove rear cover from the printer by releasing the hooks at the right and left sides of the printer and then remove the DX rear chute from the rear cover C. DX rear chute ti N) Fig. 4-37 Rear cover - Brother International HL 1850 | Service Manual - Page 124
AND RE-ASSEMBLY 3.8 Rear Cover R & L / Side Cover R & L (1) Remove the two shoulder screws to remove the rear cover R and rear cover L from the printer. Rear cover R Printer 0 Shoulder screws Fig. 4-38 Rear cover L (2) Remove the three shoulder screws at the side and the back of the side cover - Brother International HL 1850 | Service Manual - Page 125
CHAPTER 4 DISASSEMBLY AND RE-ASSEMBLY Fig. 4-39 4-24 - Brother International HL 1850 | Service Manual - Page 126
4 DISASSEMBLY AND RE-ASSEMBLY 3.9 MP Cover ASSY (1) Open the MP cover ASSY. Remove the MP paper guide 1 ASSY from the front cover by releasing two hooks and pulling slightly upward. Printer 0 MP paper guide 1 ASSY MP cover ASSY (hook) Fig. 4-40 (2) Remove the cup B M3x£ Taptite screw to remove - Brother International HL 1850 | Service Manual - Page 127
CHAPTER 4 DISASSEMBLY AND RE-ASSEMBLY (4) Remove the MP cover ASSY from the printer. (hook) Printer (hook) (hook) 9 MP cover ASSY Fig. 4-42 (5) Remove the MP side guide 2 from the MP cover and then MP side guide 3 from the MP side guide 2. MP side guide 3 MP side guide 2 Fig. 4-43 MP cover 4-26 - Brother International HL 1850 | Service Manual - Page 128
CHAPTER 4 DISASSEMBLY AND RE-ASSEMBLY 3.10 Process Unit Cover ASSY (1) Release the hooks while pushing the process unit cover ASSY slightly inward to remove the cover by pulling it forward. (hook) ----- Ili Printer %(6) c) --- 4. Fig. 4-44 Process unit cover ASSY (2) Remove the two cup B - Brother International HL 1850 | Service Manual - Page 129
the P harness cover. (4) Disconnect the LD harness and the polygon motor connector. (5) Taking care not to touch the lens and mirror, remove the laser unit. LD harness Laser unit Taptite, cup S M3x16 Polygon motor connector z N (hook) Fig. 4-47 Polygon motor connector P harness cover 4-28 - Brother International HL 1850 | Service Manual - Page 130
, wipe off dirt or dust with soft clean paper. Refer to subsection 3.3 `Cleaning the Scanner Window' in CHAPTER 5. Laser unit Reflect mirror Printer body ---- e -----Pl-- , A,,,, Scanner window Lens Fig. 4-48 ' 3.12 Fixing Unit (1) Place the main frame on its base so that the rear - Brother International HL 1850 | Service Manual - Page 131
bind B tite 3x10 screws to remove the FU front paper guide from the fixing unit . Pin Fixing unit ti O FU front paper guide Fig. 4-50 Screw, bind B tite 3x10 (6) Remove the two cup B M3x20 Taptite screws from the top of the fixing unit frame. (7) Release the thermistor harness from the hooks - Brother International HL 1850 | Service Manual - Page 132
(9) Remove the one pan B M3x10 Taptite screw securing the halogen lamp connector plate at the drive unit side of the FU frame upper and then loosen the pan (washer) M2.6x6 screw at the other side. (10) Disconnect the halogen lamp connector from the FU frame upper. (11) Lift the right hand - Brother International HL 1850 | Service Manual - Page 133
CHAPTER 4 DISASSEMBLY AND RE-ASSEMBLY NOTE: When re-assembling the halogen heater lamp, ensure that the direction of the halogen heater lamp is correct referring to the figure above. 4-32 - Brother International HL 1850 | Service Manual - Page 134
CHAPTER 4 DISASSEMBLY AND RE-ASSEMBLY CAUTION: 0 • Never touch the surface of the halogen heater lamp. • When securing the screw to assemble the halogen lamp connector plate, ensure you use the plastic jig as shown in the figure below to avoid damaging the edge of the halogen heater lamp. - Brother International HL 1850 | Service Manual - Page 135
CHAPTER 4 DISASSEMBLY AND RE-ASSEMBLY NOTE: • When re-assembling the heat roller 25 HE to the FU frame upper, place the two projections at the right hand side of the roller onto the bosses on the frame as shown in the figure below. Heat roller gear 34 HR bearing 25 projection) (boSS) 7 4 , I - Brother International HL 1850 | Service Manual - Page 136
CHAPTER 4 DISASSEMBLY AND RE-ASSEMBLY (14) Remove the pressure roller 25 from the FU frame lower by gently levering the right hand side upwards to release it from the PR bearing and then sliding it to the right to remove it. (15) Remove the five cleaner pinch roller ASSY complete with the pick off - Brother International HL 1850 | Service Manual - Page 137
, bind B tite 3x10 Fig. 4-60 Eject sensor PCB ASSY FU frame lower (21) Release the paper eject actuator from the hook on the FU frame lower, and then slide the paper eject actuator to the right direction to remove the paper eject actuator and the eject actuator spring from the FU frame lower - Brother International HL 1850 | Service Manual - Page 138
eject actuator is seated correctly in the locating channel referring to the figure below; FU frame lower 1 er t t Paper eject actuator Fig. 4-62 Eject actuator spring (22) Release the thermistor harness from the hooks on the FU frame upper and then remove the one - Brother International HL 1850 | Service Manual - Page 139
frame upper. NOTE; When removing the left end of the eject roller, align the protrusion of the hook of the frame with the concave part of the roller, and then pull the roller through underneath the protrusion. FU frame upper I` 1 ..---_--,/ Eject roller itl Idle gear 13H Taptite, B 2.6x10---ir - Brother International HL 1850 | Service Manual - Page 140
CHAPTER 4 DISASSEMBLY AND RE-ASSEMBLY (24) Remove the eject pinch roller F (8pcs.) with the eject pinch roller holder R (2pcs.) and the eject pinch roller holder L (2pcs.) from the FU frame upper, and then remove the eject pinch spring (4pcs.). Eject pinch roller F with eject pinch roller holder R - Brother International HL 1850 | Service Manual - Page 141
CHAPTER 4 DISASSEMBLY AND RE-ASSEMBLY 4-41 - Brother International HL 1850 | Service Manual - Page 142
CHAPTER 4 DISASSEMBLY AND RE-ASSEMBLY (26) Release the harness from the hooks on the FU frame upper. Turn the frame up-side down. Remove the cup B M3x6 Taptite screw to remove the pick off finger holder plate and then remove the pick off finger using a piece of tweezers. Pick off finger Taptite, - Brother International HL 1850 | Service Manual - Page 143
pick-up roller ASSY with two roller collars to the left (the bearing R side) to release from the paper pick-up roller shaft. (4) Remove the paper pick-up roller ASSY and the roller collars from the front chute ASSY. (5) Remove the bearing L from the front chute ASSY. washer Roller collar Bearing - Brother International HL 1850 | Service Manual - Page 144
CHAPTER 4 DISASSEMBLY AND RE-ASSEMBLY 3.14 Feed MP Unit (1) Turn the main frame the right way up. (2) Open the MP roller cover. (2) Remove the bearing R from the MP chute ASSY. (3) Shift the paper pick-up roller ASSY with two roller collars to the left (the bearing R side) to release from the MP - Brother International HL 1850 | Service Manual - Page 145
CHAPTER 4 DISASSEMBLY AND RE-ASSEMBLY (6) Remove the separation plate ASSY. (7) Remove the two MP pressure spring 25. (8) Remove the two bind B tite 3x10 screws from the MP chute cover. (9) Release the two bosses at the both ends of the MP pressure plate ASSY using a flat screwdriver, and then - Brother International HL 1850 | Service Manual - Page 146
screw to remove the reversing switch solenoid from the reversing drive frame unit. Screw, cup S tite 3x6 O ck :V ....• 0 0 0 Reversing drive frame unit Fig. 4-72 Printer body Drive unit Reversing switch solenoid .1% 0 / / c/? 0 ----_____ Screw, bind M3x4 Fig. 4-73 a Reversing drive frame - Brother International HL 1850 | Service Manual - Page 147
the T-belt by releasing the hook of the two gears. Switch arm ASSY 0 ,..s (hook) Gear .,. d (hook) T-belt t N1 Gear (hook) ------___ V .(i ,,. 0 . rive unit Fig. 4-74 (5) Remove the two cup S tite 3x6 screws to remove the gear pressure plate from the gear plate. (6) Shift the pendulum - Brother International HL 1850 | Service Manual - Page 148
the drive sub ASSY A and remove the spring, extension P/R from the gear 60 P/R. (9) Disconnect the connectors for the main motor ASSY and the toner LED PCB unit. (10) Remove the drive sub ASSY A from the main frame. Gear 60 PIR Spring, extension PIR Screw, cup S tite M3x6 Lock Iev O springs - Brother International HL 1850 | Service Manual - Page 149
the drive sub ASSY A. Screw, cup S tite 3x6 Screw, cup S tite 3x6 ''‹ r ) Drive sub ASSY A Cg 7 (A) , Fuser drive gear Main motor ASSY Fig. 4-77 (8) Place the main frame so that the drive unit side is at the right as the figure shown below. (9) Remove the two bind B M4x10 Taptite screws - Brother International HL 1850 | Service Manual - Page 150
10) Disconnect the two connectors for the solenoid relay PCB to remove the solenoid unit from the drive unit. (11) Release the two hooks and remove the solenoid ASSY 04C4 (red) and the solenoid ASSY 04C5 (black) from the unit Main frame 0 DX guide rail L N 8 Screw,bind M3x4 Screw,bind M3x4 4-50 - Brother International HL 1850 | Service Manual - Page 151
CHAPTER 4 DISASSEMBLY AND RE-ASSEMBLY (16) Remove the gear 60 P/R and gear 72 MP from the conductor bearing 5, and remove the middle roller gear from the conductor bearing H. (17) Remove the two conductor bearing 5. (18) Turn the knob of the conductor bearing H as the figure shown below, and remove - Brother International HL 1850 | Service Manual - Page 152
3x6 screws from the main PCB ASSY. (2) Disconnect the four connectors for the low-voltage power supply, engine PCB, the panel PCB and the scanner unit. (3) Remove the main PCB ASSY from the frame. Main PCB ASSY Screw, pan M3x6 1 Main frame Fig. 4-83 Screw, cup S tite M3x6 Screw, cup S tite - Brother International HL 1850 | Service Manual - Page 153
the five bind B M4x10 Taptie screws and four cup S tite 3x6 screws from the base plate. (3) Slide the base plate to the rear of the printer to remove it. Taptite, bind B M4x10 Screw, cup S tite 3x6 Base plate Main frame UU UU Fig. 4-85 UU Screw, cup S tite 3x6 3.20 Engine - Brother International HL 1850 | Service Manual - Page 154
CHAPTER 4 DISASSEMBLY AND RE-ASSEMBLY (2) Remove the two bind B M4x10 Taptite screws, one from the high-voltage PS PCB ASSY and the other from the engine PCB ASSY. (3) Shift the engine PCB ASSY slightly and remove the central connector, which connects the engine PCB ASSY, and the high-voltage PS - Brother International HL 1850 | Service Manual - Page 155
before removing the DX sensor PCB ASSY. (1) Remove the two cup S tite 3x6 screws to remove the DX guide rail L with DX sensor PCB ASSY from the main frame. Main frame 0 13 ..------ DX guide rail L o DX sensor PCB ASSY Fig. 4-88 Screw, cup S tite 3x6 (2) Remove the bind B M3x8 Taptite screw to - Brother International HL 1850 | Service Manual - Page 156
duct to remove it. (3) Remove the cup S tite 3x6 screw to remove the toner sensor PCB unit. Toner Sensor PCB Unit (hook) (hook) Fan duct e t, Toner Sensor PCB Unit Screw, cup S tite 3x6 (hook) Main frame R Fig. 4-90 3.23 Toner LED PCB Unit (Light Emission) NOTE: Be sure to disconnect the - Brother International HL 1850 | Service Manual - Page 157
roller ASSY from the front chute ASSY by sliding to the left, then lifting upward. (3) Remove the joint 5 from the paper feed roller ASSY. Joint 5 J Paper feed roller ASSY r\ ,',..Y.,..•" • 0 'MI\ (catch) Front chute ASSY Fig. 4-92 Bearing 5 3.25 First Feed Roller ASSY NOTE: Be sure to - Brother International HL 1850 | Service Manual - Page 158
the four bind B M4x10 Taptite screws to remove the front chute ASSY. PE actuator CA actuator ti 5T) Taptite, bind B M4x10 Taptite, bind B M4x10 Paper pick-up roller shaft I CI ts First feed roller shaft Front chute ASSY Fig. 4-94 (5) Turn the front chute ASSY upside-down, and then remove - Brother International HL 1850 | Service Manual - Page 159
sure to disconnect all the connectors on the fan relay PCB before removing the exit roller unit. (1) Remove the two shoulder screws to remove the exit roller unit from the printer. Shoulder screws Exit roller unit Fig. 4-95 (2) Remove the two bind B M4x10 Taptite screws to remove the exit roller - Brother International HL 1850 | Service Manual - Page 160
CHAPTER 4 DISASSEMBLY AND RE-ASSEMBLY (5) Remove the fan motor 60B unit from the exit roller holder. Fan motor 60B unit Exit roller holder Fig. 4-98 - Brother International HL 1850 | Service Manual - Page 161
CHAPTER 4 DISASSEMBLY AND RE-ASSEMBLY 4. PACKING AC Cords Accessory Carton Drum Unit (with Toner Cartridge included) Pad Accessory Bag Pad L Printer Carton Fig. 4-99 4-68 - Brother International HL 1850 | Service Manual - Page 162
HL-1850/1870N SERVICE MANUAL CHAPTER 5 PERIODIC MAINTENANCE To avoid creating secondary problems by mishandling, follow the warnings below during maintenance work. A WARNING (1) Always turn off the power switch and unplug the power cord from the power outlet before accessing any parts inside the - Brother International HL 1850 | Service Manual - Page 163
Re-install the drum unit assembly in the printer. (7) Reset the page counter referring to the instructions supplied with the new drum unit. (8) Close the front cover. CAUTION: • For best performance, use only genuine Brother toner. The product should only be used in a clean, dust-free environment - Brother International HL 1850 | Service Manual - Page 164
HL-1850/1870N SERVICE MANUAL NOTE: There are many factors that determine the actual toner life, such as temperature, humidity, type of paper that you use, the number of pages per print job, etc. (1) Press the cover release button and then open the front cover. (2) Pull out - Brother International HL 1850 | Service Manual - Page 165
top print quality. • Printing with a 3rdparty toner or toner cartridge may reduce not only the printing quality but also the quality and life of the printer itself. It may also cause serious damage to the performance and life of a genuine Brother drum unit Warranty cover is not applied to problems - Brother International HL 1850 | Service Manual - Page 166
Name Fixing Unit (115V) Fixing Unit (230V) Part No. 117005001 . L.17006001 Qty Service life (number of prints) 1 , 1 80,000 pages 80,000 pages Replacement Procedure See subsection 3.12 in CHAPTER 4. Paper Feeding Kit (Pad holder ZLh ASSY / 115615001 Paper pick-up roller ASSY) , Laser Unit - Brother International HL 1850 | Service Manual - Page 167
parts periodically to avoid any printer problems or print image defects. • CAUTION: While drum unit and scanner window cleaning basically can be implemented by the end user, the electrical terminals inside the printer and on the drum unit should be cleaned by a service technician. Instruct the users - Brother International HL 1850 | Service Manual - Page 168
HL-1850/1870N SERVICE MANUAL 4) Clean the primary corona wire inside the drum unit by gently sliding the blue tab from right to left several times. Return the tab to the home position before re-install the drum unit assembly. Home position 0 4 Fig. 5-10 - Brother International HL 1850 | Service Manual - Page 169
HL-1850/1870N SERVICE MANUAL 5) Re-install the drum unit assembly into the printer. Close the front cover. 6) Plug in the power cord, and then turn on the power switch. CAUTION: • Handle the drum unit carefully since it contains toner. If toner scatters and your hands or cloths get dirty, - Brother International HL 1850 | Service Manual - Page 170
4. MTBF / MTTR The meantime between failure (MTBF and the meantime to repair (MTTR) for this printer are as follows; MTBF: Up to 4,000 hours MTTR: Average 30 minutes except the periodical maintenance parts (the Paper Feeding Kit) and the printer control boards whose MTTR is average 5 minutes - Brother International HL 1850 | Service Manual - Page 171
HL-1850/1870N SERVICE MANUAL CHAPTER 6 TROUBLESHOOTING 1. INTRODUCTION 1.1 Initial Check (1) Operating environment Check if : • The source voltage stays within ±10% from the rated voltage shown on the rating plate. • The printer is installed on a solid, level surface. • The room temperature is - Brother International HL 1850 | Service Manual - Page 172
occurred, print several pages or leave the printer for 2 hours to allow it to reach room temperature. If the drum unit is unpacked soon after it is moved from a cold room to a warm room, condensation may occur inside the unit, which may cause incorrect images. Instruct the user to allow the unit to - Brother International HL 1850 | Service Manual - Page 173
HL-1850/1870N SERVICE MANUAL 1.3 Identify the Problem If you encounter any printer error or problem, first identify it referring to the chart below, then see the appropriate section. NOTE: The following troubleshooting sections contain both the actions which users should take or check and the ones - Brother International HL 1850 | Service Manual - Page 174
OPEN FUSER OPEN FACE UP OPEN JAM XXXXXX MANUAL FEED BUFFER ERROR STORAGE FULL DOWNLOAD FULL FONT FULL MEMORY FULL SIZE MISMATCH Remedy Replace the toner cartridge with a new one. Refer to subsection 1.2 Toner Cartridge' in CHAPTER 5 (1) Load paper into the indicated printer tray. (2) If paper is - Brother International HL 1850 | Service Manual - Page 175
HL-1850/1870N SERVICE MANUAL Error Message PRINT OVERRUN IGNORE DATA SIZE ERROR DX SIZE ERROR T1 SIZE ERROR T2 NO DX TRAY DX LEVER ERROR NO TRAY1 CLEAN DRUM UNIT Remedy Reduce the resolution, or add the optional memory. (1) Press the Go switch to print the data remaining in the printer. (2) Reduce - Brother International HL 1850 | Service Manual - Page 176
6 TROUBLESHOOTING 2.2 Service Calls When each of the following messages appears alternately on the LCD, a user unrecoverable error may have occurred. Instruct the user to turn off the power switch, wait 5 seconds and then turn it on again. If the error is not cleared and the same service call - Brother International HL 1850 | Service Manual - Page 177
HL-1850/1870N SERVICE MANUAL Holding down the - switch and the Set switch at replace the main PCB. Instruction access error Turn off the printer. Wait a few seconds, then turn it on again. If still remains, replace the main PCB. Memory address not aligned Turn off the printer. Wait a few seconds - Brother International HL 1850 | Service Manual - Page 178
HL-1850/1870N SERVICE MANUAL PR2001022 Error Messages ERROR E49 ERROR E50 ERROR E51 ERROR E52 ERROR E54 ERROR H60 ERROR H61 ERROR H63 ERROR H66 ERROR H67 ERROR H68 ERROR H73 ERROR H74 ERROR H37 ERROR H38 ERROR H39 Meaning Malfunction of fuser detected by hard wear. Malfunction of fuser detected - Brother International HL 1850 | Service Manual - Page 179
the software application manual. The printer does not print into the face down output tray. Close the face up output tray. The printed pages are curled, so the face down output tray can not hold the prescribed number of pages. The printer does not print on the specified paper. (1) Turn the paper - Brother International HL 1850 | Service Manual - Page 180
HL-1850/1870N SERVICE MANUAL 3.2 Paper Jams • If paper jams in the printer, it will stop printing and display the following messages on the LCD display. JAM TRAY1 JAM INSIDE JAM TRAY2 JAM REAR JAM MP TRAY JAM DUPLEX PAPER JAM • The shaded areas in the Fig. 6-1 below show the location of the - Brother International HL 1850 | Service Manual - Page 181
CHAPTER 6 TROUBLESHOOTING 3.2.1 Clearing jammed paper Clear the jammed paper following the procedures below; JAM TRAY 1 (1) Pull the paper cassette completely out of the printer. (2) Pull the jammed paper out of the printer. (3) Install the paper cassette into the printer. ae Fig. 6-2 7 Fig. 6-3 - Brother International HL 1850 | Service Manual - Page 182
printer. HL-1850/1870N SERVICE MANUAL JAM MP TRAY (1) Remove the jammed paper from the multi-purpose tray. (2) Reset all the paper into the multipurpose tray correctly. JAM INSIDE (1) Press the cover release button, and then open the front cover. (2) Pull the drum unit assembly out of the printer - Brother International HL 1850 | Service Manual - Page 183
CHAPTER 6 TROUBLESHOOTING (3) Pull the jammed paper up and out of the printer. Fig. 6-9 (4) Install the drum unit assembly and paper cassette into the printer. Close the front cover. WARNING The fixing roller is extremely hot during operation. Remove the paper carefully. CAUTION: • After having - Brother International HL 1850 | Service Manual - Page 184
HL-1850/1870N SERVICE MANUAL CAUTION: • It is recommended to put the drum unit assembly on a piece of disposable paper or cloth so you don't accidentally spill or scatter toner. • To prevent damage to the print caused by static electricity, do not touch the electrodes shown below. v.* 0 O0 #O - Brother International HL 1850 | Service Manual - Page 185
HL-1850/1870N SERVICE MANUAL (5) Open the jam clear cover. Pull the jammed paper out of the fuser unit. Jam clear cover O Fig. 6-14 (6) Close the jam clear cover. Close the face up output tray (rear cover). (7) Install the drum unit assembly into the printer. (8) Close the front cover. Fig. 6-15 - Brother International HL 1850 | Service Manual - Page 186
6 TROUBLESHOOTING (2) Pull the jammed paper out of the fuser unit. (3) Close the face up output tray (rear cover). If the paper jam can not be cleared, go to the next step. r) 4 Fig. 6-18 7 4 (4) Pull the duplex tray and paper cassette out of the printer. Fig. 6-19 / (5) Pull the jammed paper - Brother International HL 1850 | Service Manual - Page 187
HL-1850/1870N SERVICE MANUAL 6-19 - Brother International HL 1850 | Service Manual - Page 188
for duplex printing is not set correctly for the paper size, paper jams may occur andprinting will be out ofposition on the page. PAPER JAM (1) Pull the paper cassette completely out of the printer. ie (2) Pull the jammed paper out of the printer. If the paper jam can be cleared, go to (10). Fig - Brother International HL 1850 | Service Manual - Page 189
HL-1850/1870N SERVICE MANUAL (4) Pull the drum unit assembly out of the printer. Pull the jammed paper up and out of the printer. • ( me Fig. 6-26 If the paper jam can be cleared, go to (8). (5) Open the face up output tray (rear cover). Fig. 6-27 (6) Open the jam clear cover. Pull the jammed - Brother International HL 1850 | Service Manual - Page 190
CHAPTER 6 TROUBLESHOOTING 3.2.2 Causes & countermeasures The causes for paper jam problems vary depending on the location of the paper jam. When a paper jam occurs inside the printer, you have to find the location of the paper jam first, remove the jammed paper and then take the appropriate - Brother International HL 1850 | Service Manual - Page 191
HL-1850/1870N SERVICE MANUAL 3.3 Paper Feeding Problems Even if the paper is printed and ejected without any problems such as paper jams, paper feeding problems below may appear. Users can clear these problems by following the `User Check' items for each problem. Even if the same problem occurs - Brother International HL 1850 | Service Manual - Page 192
HL-1850/1870N SERVICE MANUAL F-4 Curl or Wave FLAV. User Check (1) Check the paper used meets the recommended paper specifications. Both high temperature and humidity will cause paper to curl. (2) If the printer is used infrequently, the paper may have sat for too long in the paper cassette. Turn - Brother International HL 1850 | Service Manual - Page 193
CHAPTER 6 TROUBLESHOOTING 4. SOFTWARE SETTING PROBLEMS The printer may not print the data correctly if there are incorrect software settings. S-1 "There was an error writing to LPT1: (or BRUSB) for the printer" error message appears. FkAV User Check (1) Check that the printer cable is not - Brother International HL 1850 | Service Manual - Page 194
HL-1850/1870N SERVICE MANUAL S-2 Unable to print from application software under DOS. FLAr. User Check (1) Check that the DOS application software interface settings match that of your printer. (2) Check if the printer has any printer alarms active. (3) Check if the appropriate printer is selected - Brother International HL 1850 | Service Manual - Page 195
Product ID: 11 ($6) • Vender: Brother International Corporation (or 0x4f9) Driver installation 2 Are there the following files in the Extensions Folder of System Folder? • BR_Backgrounder • BR_PrintMoniter(USB) • HL-1850/1870N • USBPrintDriver - Brother International HL 1850 | Service Manual - Page 196
HL-1850/1870N SERVICE MANUAL 5. and the power plug? Result No No Yes Yes Remedy Inform the user that the correct voltage is not supplied at the outlet. Plug the table below? PCB + lead pin - lead pin Voltage Engine P5-2 P3-10 P5-3 P3-9 Approx. 24V Approx. 5V Result No Yes No Remedy Follow - Brother International HL 1850 | Service Manual - Page 197
connector on the engine PCB good? Set paper in the manual paper slot and make a test print by pressing the control panel button. problem solved by replacing the main PCB? Result No Yes No Yes Yes Remedy Reconnect the connector. Replace the engine PCB. Replace the paper pick-up solenoid. 1) Clean - Brother International HL 1850 | Service Manual - Page 198
HL-1850/1870N SERVICE MANUAL M-5 Insufficient output from high-voltage power supply unit Possible cause High-voltage contact High-voltage power supply and the engine PCB are secured correctly. Result Remedy Yes Clean the terminals. Yes Replace the high-voltage power supply PCB No Reconnect - Brother International HL 1850 | Service Manual - Page 199
TROUBLESHOOTING power supply PCB. Yes Replace the laser unit. M-9 Fuser failure Possible cause Poor thermistor harness contact unit. Yes Replace the fixing unit. No Reinstall the thermistor properly. Yes Replace the halogen heater lamp. No Reconnect the connectors securely. NOTE: • This problem - Brother International HL 1850 | Service Manual - Page 200
HL-1850/1870N SERVICE MANUAL M-10 ROM error / D-RAM error / NV-RAM error Possible cause Main PCB Software bug Step 1 2 Check Is it possible to print the test page with the method of = 'INSPECTION MODE' in this Chapter? Does this problem appear when printing specific data or printing under a - Brother International HL 1850 | Service Manual - Page 201
6 TROUBLESHOOTING M-13 PCI BUS error Possible cause Harness connection failure Network board Main PCB Step 1 2 3 Check Is the connection between connector P21 on the main PCB and connector P1 on the network board secure? Is the problem solved by replacing the network board? Is the problem solved - Brother International HL 1850 | Service Manual - Page 202
HL-1850/1870N SERVICE MANUAL 6. IMAGE DEFECTS 6.1 Image Defect Examples dp FP I-1 Light 1-2 Dark 1-3 Completely blank 1-4 All black I-5 Dirt on back of paper I-6 Black vertical streaks LIP 1-6 Black vertical streaks Also K/0 44•1 404t4e 1-7 Black horizontal stripes I 1-8 Black vertical - Brother International HL 1850 | Service Manual - Page 203
Remedy Ground contacts Toner sensing failure (printer side) 1 Can printing be started with the Yes Check if the toner drum unit and toner cartridge sensor is dirty and removed? check the toner sensor connection. Toner sensing failure (toner cartridge side) 2 Is the problem solved when - Brother International HL 1850 | Service Manual - Page 204
HL-1850/1870N SERVICE MANUAL 1-2 LP Dark n User Check (1) Check the paper used meets the recommended paper specifications. (2) Check the printer's environment. High temperature and high humidity conditions can increase the amount of background shading. (3) Clean the corona wire with the wire - Brother International HL 1850 | Service Manual - Page 205
between the printer body and drum unit dirty? 2 Are the drum shaft and drum electrode of the printer body connected correctly? Drum unit failure 3 Is the problem solved after replacing the drum unit? Toner cartridge failure 4 Is the problem solved after replacing the toner cartridge? Scanner - Brother International HL 1850 | Service Manual - Page 206
HL-1850/1870N SERVICE MANUAL 1-4 All black bAr User Check (1) Clean the corona wire of the drum unit. (2) The drum unit may be damaged. Install a new drum unit. Possible cause Corona failure Step Check 1 . Is the corona wire dirty? Result , Yes Remedy Ground contacts . Clean the corona - Brother International HL 1850 | Service Manual - Page 207
CHAPTER 6 TROUBLESHOOTING 1-5 Dirt on the back of paper 10" 1 Possible cause Fixing unit dirty Dirt in the drum unit Step Check 1 Is the pressure roller dirty? Is any other area in the printer dirty? 2 Is the transfer roller dirty? Is the problem solved after replacing the drum unit? - Brother International HL 1850 | Service Manual - Page 208
HL-1850/1870N SERVICE MANUAL 1-6 Black and blurred vertical streaks I 1.P 2 kjgAr User Check (1) Clean the corona wire in the drum unit. (2) Check that the corona wire cleaner is at the home position. (3) Check that the toner cartridge is not empty. (4) The drum unit may be damaged. Install a - Brother International HL 1850 | Service Manual - Page 209
CHAPTER 6 TROUBLESHOOTING 1-7 Black and blurred horizontal stripes HArA4.4.weiii kjVA User Check (1) The drum unit may be damaged. Install a new drum unit. (2) Check the paper used meets the recommended paper specifications. (3) Clean the printer interior and the corona wire in the drum unit. - Brother International HL 1850 | Service Manual - Page 210
HL-1850/1870N SERVICE MANUAL 1-9 i r White vertical streaks A User Check (1) Try to wipe the scanner window with a soft cloth. (2) The toner cartridge may be damaged. Install a new toner cartridge. (3) Check the printer's environment. High temperature and high humidity conditions can cause this - Brother International HL 1850 | Service Manual - Page 211
software supplied. No Reposition the sensor to the correct position. 1-12 Poor fixing Possible cause Print paper Toner sensing failure (When printing is faint.) Step Check 1 Is thick paper of more than 43Ib being used? 2 Is the problem solved by replacing the drum unit or the toner cartridge - Brother International HL 1850 | Service Manual - Page 212
the laser unit. No Connect the harness correctly. 1-14 Faint print Possible cause Printer installation Toner cartridge Scanner window dirty Laser unit failure Step Check 1 Is the printer placed , horizontally? 2 Does the problem happen immediately after replacing the toner cartridge with - Brother International HL 1850 | Service Manual - Page 213
intervals? Drum unit failure No toner Print paper Environment 2 Is the problem solved after replacing the drum unit? 3 Is the toner in the toner cartridge almost empty? 4 Is the problem solved after changing to specified freshly unpacked paper? 5 Does the problem still appear after the printer has - Brother International HL 1850 | Service Manual - Page 214
HL-1850/1870N SERVICE MANUAL NOTE: Clean the drum unit as follows: (1) Remove the toner cartridge from the drum unit. Place the printing samples in front of the drum unit, and find the exact position of the image defect. Drum unit Position of smudge on the drum 94mm interval Printing sample Fig. - Brother International HL 1850 | Service Manual - Page 215
page. (2) The drum unit may be damaged. Install a new drum unit. Possible cause Step Check Drum unit 1 Are the spots at 94mnn intervals? (The problem is not solved after printing a few pages.) Drum connection failure Fixing unit 2 Is the contact between the drum unit and printer body connected - Brother International HL 1850 | Service Manual - Page 216
HL-1850/1870N SERVICE MANUAL 1-17 Black band P Possible cause Step Check Result Remedy Corona failure Corona failure 1 Is the wire cleaner at its home position? 2 Is the corona wire dirty? No Return the wire cleaner to its home position. Yes 1) Clean the corona wire. 2) If the problem still - Brother International HL 1850 | Service Manual - Page 217
unpacked paper. Toner sensing failure (printer side) 2 Does the "Ready" message appear on the LCD display even after removing the drum unit and toner cartridge? Yes Toner sensor failure. Clean the toner sensor and check the toner sensor connection. Toner cartridge failure 3 Is the problem - Brother International HL 1850 | Service Manual - Page 218
CHAPTER 6 TROUBLESHOOTING 1-20 • Downward fogging of solid black Possible cause Toner cartridge failure High-voltage power supply PCB failure Step Check 1 Is the problem solved after replacing the toner cartridge? 2 Is the problem solved after replacing the high-voltage power supply PCB? - Brother International HL 1850 | Service Manual - Page 219
1-22 Light rain HL-1850/1870N SERVICE MANUAL Possible cause Drum unit failure Drum connection failure Step . Check 1 Is the problem solved after replacing the drum unit? 2 Is the contact between the drum unit and printer body connected correctly? High-voltage power supply PCB failure 3 Is - Brother International HL 1850 | Service Manual - Page 220
CHAPTER 6 TROUBLESHOOTING 1-24 Toner specks :VA User Check (1) Check the paper used meets the recommended paper specifications. A rough surfaced paper may cause the problem. (2) The toner cartridge may be damaged. Install a new toner cartridge. (3) The drum unit may be damaged, or may be nearly - Brother International HL 1850 | Service Manual - Page 221
6.3 Location of Grounding Contacts 6.3.1 Drum unit (5) Gri (8) Cleaner Drum Unit HL-1850/1870N SERVICE MANUAL (2) Wire cleaner (4) Development roller (1) Photosensitive drum (3) Charge (6) Transfer roller Fig. 6-34 6.3.2 Printer body & Paper cassette (5) Grid (3) Charge (8) Cleaner 1 (1) - Brother International HL 1850 | Service Manual - Page 222
specified section of this chapter. NOTE: If the printer prints garbage or incorrect fonts, instruct the user to use the `Troubleshooting for Printer won't print' tool of the self-diagnostics tools. If the problem cannot be solved, instruct user to use the Diagnostics' tool described in the Appendix - Brother International HL 1850 | Service Manual - Page 223
HL-1850/1870N SERVICE MANUAL P-2 Unable to print full pages of a document with the "PRINT OVERRUN" message. rA User Check (1) Press the Go switch on the control panel to print the data remaining in the printer. (2) If this does not clear the error, reduce the complexity of your document or reduce - Brother International HL 1850 | Service Manual - Page 224
CHAPTER 6 TROUBLESHOOTING P-4 Headers or footers are not printed out even though they are viewed on PC screen. n User Check Most laser printers have a restricted area that cannot be printed on. Usually the first two lines and last two lines of text cannot print (leaving 62 printable lines). - Brother International HL 1850 | Service Manual - Page 225
HL-1850/1870N SERVICE MANUAL 8. NETWORK PROBLEM If the error related to network occurs, refer to the following sections; 8.1 Installation Problem If you cannot print over the network, check the following: (1) Make sure that the printer is powered on, is on-line and ready to print. Verify that the - Brother International HL 1850 | Service Manual - Page 226
Brother print memory in your printer and the latest printer driver installed on your computer. The latest Brother printer drivers can be downloaded from www.brother.com. (2) Check the individual protocol troubleshooting sections in this chapter for additional causes of intermittent printer problems - Brother International HL 1850 | Service Manual - Page 227
HL-1850/1870N SERVICE MANUAL 8.3 TCP/IP Troubleshooting If you are using TCP/IP and cannot print to the print printer and then on again, • Delete and recreate the print server and create a new print queue in order to eliminate the possibility of setup errors. (1) The problem the X-Window Print tool - Brother International HL 1850 | Service Manual - Page 228
) Troubleshooting If you are having trouble printing on a Windows 95/98/Me Peer to Peer network (LPR method), check the following: (1) Make sure that the Brother LPR Port driver is correctly installed and configured according to the Windows 95/98/Me Peer to Peer chapters in the Network User's Guide - Brother International HL 1850 | Service Manual - Page 229
HL-1850/1870N SERVICE MANUAL 8.7 Windows 95/98/Me (or later) Peer to Peer (HP JetAdmin Compatible Method) Troubleshooting If you are having trouble printing on a Windows 95/98 (or later) Peer to Peer network, check the following (HP JetAdmin compatible method): (1) If the print server does not show - Brother International HL 1850 | Service Manual - Page 230
CHAPTER 6 TROUBLESHOOTING 8.10 Novell Netware Troubleshooting If you cannot print from NetWare and you have checked the hardware and network as described in the previous steps, first verify that the Brother print server is attached to the server queue by going to PCONSOLE, selecting PRINT QUEUE - Brother International HL 1850 | Service Manual - Page 231
HL-1850/1870N SERVICE MANUAL (5) Verify that you have selected the correct AppleTalk zone. Because the print server gets its zone information from router broadcasts, it may not be in the zone you expect, and wil l therefore not show up in the - Brother International HL 1850 | Service Manual - Page 232
CHAPTER 6 TROUBLESHOOTING 9. INSPECTION MODE 9.1 Entering Inspection Mode Select the inspection mode you want to use following the steps below; (1) Turn off the power switch of the printer (2) Turn on the power switch while holding down the Go switch and the Set switch. (3) Release the both - Brother International HL 1850 | Service Manual - Page 233
HL-1850/1870N SERVICE MANUAL 9.2 Sensor Check Mode The sensor check mode is used to check if the sensors in the printer are functioning correctly. In the process of this inspection, the Data LED and the control panel switches are also checked. On entering this mode, the - Brother International HL 1850 | Service Manual - Page 234
Lower tray unit paper empty sensor Lower tray unit sensor 13th 14th 15th 16th F Black square R Black square E Black square Not used Front registration sensor Rear registration sensor Paper eject sensor Status ON: The front cover is open. OFF: The front cover is closed. ON: The toner cartridge is - Brother International HL 1850 | Service Manual - Page 235
HL-1850/1870N SERVICE MANUAL 6-69 - Brother International HL 1850 | Service Manual - Page 236
HL-1850/1870N SERVICE MANUAL CHAPTER 7 HIDDEN FUNCTIONS 1. ENTERING HIDDEN FUNCTION MENU MODES HL-1850/1870N has 3 entrances into the hidden function menu; 1. Power on and press the Go switch and the Set switch. (Professional Menu mode) See section 2. `PROFESSIONAL MENU - Brother International HL 1850 | Service Manual - Page 237
MENU MODE The Professional Menu mode enables to customize various functions for specific users and may be opened to users if necessary. 2.1 Enabling and Disabling Professional Menu Mode Entering the Professional Menu Mode Turn the machine on. Press the Go switch and Set switch together to enter the - Brother International HL 1850 | Service Manual - Page 238
HL-1850/1870N SERVICE MANUAL 2.2 Function Table The following printer settings and function will be available with this operation. Title & Subtitle TRAY SETTING (MANUAL FEED) Item to be Set PAPER IN=CONT* PAPER IN=STOP TRAY COMMAND MODE READOUT SELECT TRAY COM.=NORM* TRAY COM.=SPEC. READOUT=OFF - Brother International HL 1850 | Service Manual - Page 239
CHAPTER 7 HIDDEN FUNCTIONS I SR FONT SELECT BRO FONT SELECT I SRFONT=DI SABLE* I SRFONT=ENABLE BROBITM=DI SABLE* BROBITM=ENABLE Enables and disables to select Hebrew font. Enables and disable the built-in 10/12 pitch Brougham bitmap font. 7-4 - Brother International HL 1850 | Service Manual - Page 240
HL-1850/1870N SERVICE MANUAL Title & Subtitle FONT SELECT 300DPI PRIORITY Item to be Set 3B PRIO=LOW* 3B PRIO=HIGH FX/XL SCALE FONT SCAL.F=NORMAL* FX/XL SCALE ITA. SCAL.F=ALL SIZE ITA=OBLIQUE* exit FONT PAPER&TRAY SIZE ITA=ITALIC SEL DEF PAPER=LT* DEF PAPER=A4 PARALLEL MENU PARALLEL TIMING - Brother International HL 1850 | Service Manual - Page 241
CHAPTER 7 HIDDEN FUNCTIONS 'DRAM CHECK START START DRAM TEST Tests DRAM data. i 7-6 - Brother International HL 1850 | Service Manual - Page 242
HL-1850/1870N SERVICE MANUAL and removes "DEMO PAGE" into the user menu. Switches the emulation to the ON: Makes print speed faster with an OS/2 driver. Modulates calculation Reset a printer with ESC E. Carries out form feed with ESC E. Does not eject paper when there is no data. Does not eject paper - Brother International HL 1850 | Service Manual - Page 243
the copy page number. JOB: Changes "reset printer" function to "job cancel" function. PJL JOB TIMEOUT is effective. PJL JOB TIMEOUT does not carry out. Tests color of the backl ight. Tests view angle of the LCD display. Displays and prints out NVRAM data. Users MUST NOT use this function. Selects - Brother International HL 1850 | Service Manual - Page 244
APPLEUSBPS DX 1JOB1PAGE SEL PS FONT CACHE exit MENU HL-1850/1870N SERVICE MANUAL BINARY=OFF* BINARY=ON 1JOB1PAGE=SX* 1JOB1PAGE=DX CLEAR CACHE=OFF* CLEAR CACHE=ON Enables to print PSPureBinary data via MacUSB. Select print by simplex or duplex when certain JOB which has only 1 page was sent. - Brother International HL 1850 | Service Manual - Page 245
COUNT TONER CHANGE DRUM CHANGE PF KIT 1 CHANGE PF KIT 2 CHANGE FUSER CHANGE LASER CHANGE COVERAGE A4 PAGE LETTER PAGE LEGAL PAGE EXECUTIVE PAGE B5 PAGE JIS B5 PAGE Description Displays the number of printing pages. Displays the number of jam occurrence. Displays the number of the toner cartridge - Brother International HL 1850 | Service Manual - Page 246
HL-1850/1870N SERVICE MANUAL A5 PAGE A6 PAGE Title SERVICE INFO Subtitle B6 PAGE COM10 PAGE C5 PAGE DL PAGE MONARCH PAGE A4 LONG PAGE ERROR HI STORY 1:####### 2:####### 3 : ####### 10 :####### LIFE PERIOD DRUM LIFE DRUM UNIT MODIFY COUNT PF KIT 1 PF KIT 2 FUSER UNIT LASER UNIT JAM - Brother International HL 1850 | Service Manual - Page 247
Title MODIFY COUNT RESET COUNT Subtitle REMAIN LIFE DRUM UNIT PF KIT 1 PF KIT 2 Description Modify the drum unit remaining life counters. Modify the PF kit remaining life counters. FUSER UNIT Modify the fixing unit remaining life counters. LASER UNIT Modify the laser unit remaining life - Brother International HL 1850 | Service Manual - Page 248
HL-1850/1870N SERVICE MANUAL PR2001022 4. OTHER HIDDEN FUNCTION MENUS 4.1 Hidden Function Menus Enabled by Pressing Switch(es) When Turning the Machine on The following settings and function will be available by holding down the specified switch(es) while turning the machine on. Switch(es) Go - Brother International HL 1850 | Service Manual - Page 249
UNIT NETWORK BOARDI MAIN PCB = , F.E'R OM 490111 GNU P111 Vb. 1 2 3 4 6 6 7 8 9 10 -6. 5. 7 T•P f . LASER SCANNER MOTOR ? T 7 ? ? 1: ,I,. U(Og6t SCANNER UNIT g g P - 4> 4' CT SEM. EECT _ PCB bERESIER 1 HEATER UNIT ? 741 2g iner.ft6e 9' T 0 MMM ...D. 2 TONER LEO PCB TCPEF1 PART - Brother International HL 1850 | Service Manual - Page 250
Appendix 1. Connection Diagram, HL-1850/1870N 3 4 5 B p I 7 10 11 12 4 CV x014 sum nu 1:241 14-' 1 1,°(":" I LI! -Pi P2 12 tT UMIT P11* UP MEM UNIT Loss WSW UNIT WAIVER OOP a Hgrerfit MIT IDEtillelan PRAT Nil IN Kirov ,:C wow, RUM btlir nn tg NMI r; EON 0 V P1 ft 13 FA. - Brother International HL 1850 | Service Manual - Page 251
Appendix 2. Main PCB Circuit Diagram, HL-1850/1870N (1/6) 2 I 3 5 A fi Q I 7 wag] 'Dwain / 11474121 PAGE M 04110E 0 14387J4338 124141111 scm 246 0_99 249 030 _ 6 22 3~ a 4 6 A 7 0 9 10 12 In CLR 20_11 O o Zo cut au, '1 30 PA 2111 0 20 i 7C74U.C7467 O 7C751.12EF - Brother International HL 1850 | Service Manual - Page 252
Appendix 3. Main PCB Circuit Diagram, HL-1850/1870N (2/6) 2 RESET IC 6 .4 REGULATOR I veo CAS'in,6 rnlo 21w art 94.50, 9,1 BIZ 1.0 CC ruto txfe • • 45' T 16031, 000 ecere t C.3 anteediEu CH. 62962 1.13_07 01,crg4 , vyy - Brother International HL 1850 | Service Manual - Page 253
Appendix 4. Main PCB Circuit Diagram, HL-1850/1870N (3/6) 2 PCI ant mse.x , " Pu99,. 4.42,X Punt PXEC 0437,( ./ oz,ix P+oucE ^a psolAK P141,5*.. NOM< P.i9X 24,959X`' 91.224K 15 P.99,‹ 2.24t, n 4.911•C 9122A, cpasery.,.. - Brother International HL 1850 | Service Manual - Page 254
L §iA t .9 96.8 91 9 R4 RZRN 5 m. s 0 000001 5 5 LL TOG} IL 10-451171.3 88888888888883388 5 of 55@g55@ 808088 91 RI 15 93 4 .. 555 I 55 HW I cal Ul 19 cn 98 x § tq 9 a la-E51137( iiiiiiiii1 ::: 7 7 74717,7 7 7 .,1711 :: i :: i al .1 2 5 5 5(5(5 5 5 5 5(5( 5 5 - Brother International HL 1850 | Service Manual - Page 255
Appendix 6. Main PCB Circuit Diagram, HL-1850/1870N (5/6) 2 3 5 6 47 1 7 9 10 11 12 A FLASH ( f or BRNET ) C9F6141,1e14--D-CM tjett t-sc/4-15V-3. 4 • "121 034,9, 01A141 013:1151 A.151 pa4171 X.1 10] 0134191 41341101 4041111 Ase fel 01341141 Amite' 0.. I f61 0071171 05R1181 01311191 - Brother International HL 1850 | Service Manual - Page 256
Appendix 7. Main PCB Circuit Diagram, HL-1850/1870N (6/6) 2 3 5 A HAIRPIN L7 '7 - 19 nos m8 RaL i FFessA. PANEL LVPS la malls ppm' 22 CATA1,3 atTAl So c/ ▪ t ICI T tm 2 3 4 5 6 Q I 7 9 10 11 12 A All USB OE /am - 04TA a Fss Ham,. 9s-g-et% CardDOI 2- 43 FLIgt 11J1J JJ 6IJ - Brother International HL 1850 | Service Manual - Page 257
Appendix 8. Engine PCB Circuit Diagram, HL-1850/1870N (1/2) Red 5 Pin PH Right Angle RED 993-RMUT-21 3 0 BELA MS-. MOW Mai% Ev HVPS 0024 V024 33:238924 YORK I E 4624 BLRL cl 10=74E. raight WhietTIC PH SCAN MOTOR L Right Angle White5PinPH 74340, LION CEMN Dam SSIEHM TT DC MOT - Brother International HL 1850 | Service Manual - Page 258
Appendix 9. Engine PCB Circuit Diagram, HL-1850/1870N (2/2) A FAN TONERSENS Red 9 Pin PH Right Angle O • 49 0 12 a II D1781/0 -0 tl rzt 161 -BD1340.0.44 ~AW 1V t t • 0070191 9 -0 -0i 2 3 4 S 7 T 4 BAfAME, KC TIXERE11_,. Lem? 1,0 ' 9 , 1C 0- 10 A Y vh f I CA-N313 12 Straight White - Brother International HL 1850 | Service Manual - Page 259
Board PCB Circuit Diagram, HL-1850/1870N 5 T7 I 9 10 11 12 NI A AM79C973AKC PI PCI +3V0 ADIS ADIS VSSB VSSB VSSB VSSB VSSB VSSB VSSB DVSSD DVSSP DVSSX DVDDD 08 DVDDP DVDDA C27 103 ,C3 10 124 103 L4 2 81_011/.3005 LS BLM1IP3002 1' 2 BLM]IP3005 AVCC C20 100u LI 81_011/.3005 C19 - Brother International HL 1850 | Service Manual - Page 260
Mie Brother C: BIUK (1) Printer: Printed on the label attached on the rear of the main body 1 I I < SERIAL NO. > U52£82A2111101 LL ! SEQUENTIAL NO. FACTORY ID NO. YEAR - MONTH (2) Process unit: Imprinted on the aluminum bag (Drum unit with toner cartridge) 2A11 - Brother International HL 1850 | Service Manual - Page 261
. APPENDIX PR2001069 Printed on the bar code label attached on the toner cartridge CARTRI DGE PRODUCTION INFO. M26,00199 MONTH YEAR- SERIAL NO. TONER VOLUME FACTORY ID NO. (5) Laser unit: On the laser unit 17 0 0 1 L 'PRODUCTION LOT NO. LASER UNIT NO. 7: LJ5986001 Laser Unit HE FACTORY - Brother International HL 1850 | Service Manual - Page 262
OF ROLLERS The diameter and circumference of each roller are listed below; No. Parts Name 1 First Paper Feed Roller 2 Paper Feed Roller 3 Transfer Roller 4 Photosensitive Drum 5 Heat Roller 6 Pressure Roller 7 Development Roller Diameter (Circumference) 0 13.8 mm (43.3 mm) 0 14 - Brother International HL 1850 | Service Manual - Page 263
APPENDIX APPENDIX 16. PRINT SPEEDS WITH VARIOUS SETTINGS Print speed of the HL-1850/1870N printers is up to 18/19 ppm when loading A4 or Letter size paper from the paper cassette in the Regular mode. Actual print speed varies depending on the media type or paper size as shown in the tables below; - Brother International HL 1850 | Service Manual - Page 264
17. HOW TO KNOW DRUM UNIT LIFE & PAGE COUNTER If you want to know the drum unit life or the number of printed pages, you should print out the Print Configuration page. 1. Printing out the Print Configuration Page (1) Press the Set switch three times. (2) Print the Print Configuration page. The page - Brother International HL 1850 | Service Manual - Page 265
page counter after a new drum unit is replaced, the drum unit life may be different from the drum counter. For details on the difference between the drum unit life and drum counter, refer to the drum unit life calculation below; **Printing time for 1 page/job - Brother International HL 1850 | Service Manual - Page 266
in the upper line on the right below the drum life bar and indicates the number of printed pages in units of 1 and 1,000. • Value in units of 1 The hexadecimal value stored in NV-RAM is printed. _47 :77 Example: Value in units of 1,000 000000E0DODODODOD 7 10D\ OID\ O\ 4. (Refer to the list - Brother International HL 1850 | Service Manual - Page 267
the OK button. Exit Fig. A-3 Printer Information cum MZ- L1 ** 0000 (5) The dialog box shown at the right will appear and show the frequencies of drum unit change, toner cartridge change and paper jam. OK Cancel Fig. A-4 Drum Change Toner Change Jam Count Maintenance Data : 16 64 : 128 - Brother International HL 1850 | Service Manual - Page 268
the drum counter is reset. (Maximum counter: 63) Toner cartridge change When the toner cartridge is replaced after a Toner Empty error is stored in NVRAM, then warming-up completes without a Toner Empty or Toner Low error being detected. (Maximum counter: 127) Paper jam When a paper jam occurs - Brother International HL 1850 | Service Manual - Page 269
11.59(ryi) 71-/::./31./(o) i\)6/(H) 0)k(c) tA*(3) Epej(P) Troubleshooting for "Printer won't print" 1. Printer won't print 2. Printer prints Garbage Fig. A-8 (2) Select the problem you have had, then the specified window appears. (3) Follow the instructions that appear on the PC screen. If the - Brother International HL 1850 | Service Manual - Page 270
tool, refer to "Troubleshooting for printer won't print' and see if you can solve the problem or not. If Troubleshooting does not solve your problem, use the tool by following the procedure below. Then, send the report created to the service center. Make Sure: 1. The printer is powered on. 2. Check - Brother International HL 1850 | Service Manual - Page 271
the printer reported and click the A, B or C button depending on the result. (5) The created log file is shown on the PC screen. (The software will ask whether you wish to print the log file or not.) Send the log file created with this tool to investigate the problem to the authorized service center - Brother International HL 1850 | Service Manual - Page 272
APPENDIX 3. Printer Information The drum unit life or page counter is printed on Print Configuration in some countries as described in APPENDIX 17 'HOW TO KNOW DRUM UNIT LIFE & PAGE COUNTER'. This tool also shows the printer information such as printer version or page counter for all models only - Brother International HL 1850 | Service Manual - Page 273
the toner cartridge is replaced following the "TONER EMPTY" error message (Counted from the number of the drum rotation in noncontinuous printing) • Transparency: 170°C • Thin paper: 185°C • Plain paper: 208°C (195°C when printing using duplex function) • Thick paper: 220°C • Thicker/Bond paper: 220 - Brother International HL 1850 | Service Manual - Page 274
Tray Unit is installed onto the HL-1850/1870N printer, it is necessary to exchange the cassette supplied with the LT-500 Unit with the upper cassette already fitted into the printer. Install the cassette originally fitted in the printer into the LT500 Unit. Failure to do so will cause paper jams - Brother International HL 1850 | Service Manual - Page 275
APPENDIX APPENDIX 21. GUIDELINES FOR LEAD FREE SOLDER (MAIN PCB ASSY) The LSI component mounting side of the MAIN PCB ASSY is soldered using lead free solder, be sure to use lead free solder that meets the following specification in the case of repair. Lead free solder ; NIHON GENMA DHB-RMA3 NP303 ( - Brother International HL 1850 | Service Manual - Page 276
of Main Mask ROM (=embedded Flash ROM). 4) Set up by country. Object parts LH8944001 MAIN PCB ASSY 1850/1870N Preparation tool 1) PC (Windows`] 95/98) 2) 1 HL-1850/1870N printer 3) 1 CDCC cable 4) ZLHEFWRT.EXE(software) Time required for rewriting work 1) Main firmware .. . app.7 min. 2) Network - Brother International HL 1850 | Service Manual - Page 277
other printers, repeat from the step 3. To finish working, Input "quit" in the PIT2 control window, then press ENTER. Error status STEP section display RAM size ROMID OTHERS Meaning RAM size is different Version is different Cause / Remedy Possibility of misinputting HL1850 or 1870N
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 |
 |
Brother
Laser
Printer
SERVICE
MANUAL
MODEL:
HL
-1850/1870N
O
nn
cm,
Read
this
manual
thoroughly
before
maintenance
work.
Keep
this
manual
in
a
convenient
place
for
quick
and
easy
reference
at
all
times.
January
2002
SM-PRN031