Brother HL-1870N Service Manual

Brother Laser Printer

SERVICE MANUAL

MODEL: HL-1850/1870N

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

© Copyright Brother Industries, Ltd. 2002
All rights reserved.
No part of this publication may be reproduced in any form or by any means without permission

in writing from the publisher.
Specifications are subject to change without notice.

Trademarks:
The brother logo is a registered trademark of Brother Industries, Ltd.
Apple, the Apple Logo, and Macintosh are trademarks, registered in the United States and

other countries, and TrueType is a trademark of Apple computer, Inc.
Epson is a registered trademark and FX-80 and FX-850 are trademarks of Seiko Epson

Corporation.
Hewlett Packard is a registered trademark and HP LaserJet is a trademark of Hewlett Packard

Company.
IBM, IBM PC and Proprinter are registered trademarks of International Business Machines

Corporation.
Microsoft and MS-DOS are registered trademarks of Microsoft Corporation.
Windows is a registered trademark of Microsoft Corporation in the U.S. and other countries.

HL-1850/1870N SERVICE MANUAL

PREFACE

This service manual contains basic information required for 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 of the following chapters:

CHAPTER 1: GENERAL

Features, specifications, etc.

CHAPTER 2: INSTALLATION AND BASIC OPERATION

Installation conditions, Installation procedures, basic operation of the printer
etc.

CHAPTER 3: THEORY OF OPERATION

Basic operation of the mechanical system, the electrical system and the
electrical circuits and their timing information.

CHAPTER 4: DISASSEMBLY AND RE-ASSEMBLY

Procedures for disassembling and re-assembling the mechanical system.

CHAPTER 5: PERIODIC MAINTENANCE

Periodical replacements parts, consumable parts, etc.

CHAPTER 6: TROUBLESHOOTING

Reference values and adjustments, troubleshooting image defects,
troubleshooting malfunctions, etc.

CHAPTER 7: HIDDEN FUNCTIONS

Professional menu mode and Service menu mode, etc.

APPENDICES: Serial No. descriptions, Drum life & page counter, Diameter / circumference

of rollers, Connection diagrams, PCB circuit diagrams, etc.

Information in this manual is subject to change due to improvement or redesign of the product.
All relevant information in such cases will be supplied in service information bulletins
(Technical Information).

A thorough understanding of this printer, based on information in this service manual and
service information bulletins, is required for maintaining its print quality performance and for
improving the practical ability to find the cause of problems.

i

TABLE OF CONTENTS

TABLE OF CONTENTS

REGULATION.............................................................................................viii

SAFETY INFORMATION...............................................................................x

CHAPTER 1 GENERAL .......................................................................... 1-1

1. FEATURES .............................................................................................................1-1

2. OVERVIEW .............................................................................................................1-3

3. SPECIFICATIONS...................................................................................................1-4

3.1 Printing ............................................................................................................................. 1-4

3.2 Functions.......................................................................................................................... 1-5

3.3 Electrical and Mechanical ................................................................................................ 1-6

3.4 Network ............................................................................................................................ 1-7

3.5 Paper................................................................................................................................ 1-8

3.5.1 Feedable paper................................................................................................................... 1-8

3.5.2 Paper cassette capacity....................................................................................................1-10

3.5.3 Print delivery ..................................................................................................................... 1-10

3.6 Printing Area................................................................................................................... 1-11

3.6.1 PCL5e/EPSON/IBM emulation.......................................................................................... 1-11

3.6.2 PCL6/BR-Script3 emulation .............................................................................................. 1-14

CHAPTER 2 INSTALLATION AND BASIC OPERATION ...................... 2-1

1. CONDITIONS REQUIRED FOR INSTALLATION....................................................2-1

1.1 Power Supply ................................................................................................................... 2-1

1.2 Environment ..................................................................................................................... 2-1

®

1.3 System Requirements for Brother Printer Solution for Windows

2. UNPACKING ...........................................................................................................2-2

3. INSTALL THE PRINTER .........................................................................................2-3

3.1 For All Users .................................................................................................................... 2-3

3.1.1 Install the drum unit assembly ............................................................................................ 2-4

3.1.2 Load paper into the paper cassette .................................................................................... 2-4

3.1.3 Print a test page.................................................................................................................. 2-5

3.2 For Windows® Users ........................................................................................................ 2-6

3.3 For Macintosh Users ...................................................................................................... 2-10

4. PRINTING METHODS...........................................................................................2-12

4.1 Printing from the Paper Cassette ................................................................................... 2-12

4.2 Printing from Multi-purpose Tray .................................................................................... 2-12

4.2.1 Printing on envelopes (Face up printing) .......................................................................... 2-14

4.2.2 Printing on label, transparency, etc. ................................................................................. 2-15

4.3 Printing to the Face up Output Tray (Face up Printing) ................................................. 2-17

4.4 Printing on Both Sides of the Paper (Duplex Printing) ................................................... 2-17

4.5 Manual Feed ..................................................................................................................2-18

.................................... 2-1

ii

HL-1850/1870N SERVICE MANUAL

5. CONTROL PANEL OPERATION...........................................................................2-19

5.1 Data LED Indications ..................................................................................................... 2-19

5.2 Panel Switches Functions .............................................................................................. 2-20

5.2.1 Go switch .......................................................................................................................... 2-20

5.2.2 Job Cancel switch............................................................................................................. 2-20

5.2.3 Reprint switch ................................................................................................................... 2-21

5.2.4 + & - switch ....................................................................................................................... 2-24

5.2.5 Set switch ......................................................................................................................... 2-24

5.2.6 Back switch....................................................................................................................... 2-24

5.3 LCD Display ................................................................................................................... 2-24

5.3.1 Backlights ......................................................................................................................... 2-25

5.3.2 Printer status messages ................................................................................................... 2-26

5.4 How to Use the Control Panel........................................................................................ 2-27

5.5 Control Panel Setting Menu ........................................................................................... 2-28

5.5.1 Information........................................................................................................................ 2-29

5.5.2 Paper ................................................................................................................................ 2-29

5.5.3 Quality............................................................................................................................... 2-30

5.5.4 Setup ................................................................................................................................ 2-30

5.5.5 Print menu......................................................................................................................... 2-31

5.5.6 Network............................................................................................................................. 2-34

5.5.7 Interface............................................................................................................................ 2-34

5.5.8 Reset menu....................................................................................................................... 2-35

5.5.9 Set IP address .................................................................................................................. 2-35

5.5.10 About emulation modes .................................................................................................... 2-36

5.5.11 List of factory settings ....................................................................................................... 2-36

5.6 Other Control Features .................................................................................................. 2-40

5.6.1 Sleep mode....................................................................................................................... 2-40

5.6.2 Inspection mode ............................................................................................................... 2-40

6. NETWORK BOARD OPERATION.........................................................................2-41

6.1 Installing the Network Board .......................................................................................... 2-41

6.2 Functions........................................................................................................................ 2-43

6.2.1 LED functions ................................................................................................................... 2-43

6.2.2 Factory default setting ...................................................................................................... 2-43

CHAPTER 3 THEORY OF OPERATION ................................................ 3-1

1. ELECTRONICS .......................................................................................................3-1

1.1 General Block Diagram .................................................................................................... 3-1

1.2 Main PCB Block Diagram................................................................................................. 3-2

1.3 Main PCB ......................................................................................................................... 3-3

1.3.1 ASIC.................................................................................................................................... 3-3

1.3.2 ROM.................................................................................................................................... 3-5

1.3.3 Flash ROM.......................................................................................................................... 3-6

1.3.4 SDRAM ............................................................................................................................... 3-7

1.3.5 Optional RAM...................................................................................................................... 3-9

1.3.6 PCI bus ............................................................................................................................. 3-10

1.3.7 EEPROM .......................................................................................................................... 3-11

1.3.8 Reset circuit ...................................................................................................................... 3-11

iii

TABLE OF CONTENTS

1.3.9 Engine I/O......................................................................................................................... 3-12

1.3.10 Panel I/O ........................................................................................................................... 3-12

1.4 Engine PCB.................................................................................................................... 3-13

1.5 BR-net PCB.................................................................................................................... 3-13

1.6 Power Supply .................................................................................................................3-14

1.6.1 Low-voltage Power Supply ............................................................................................... 3-14

1.6.2 High-voltage Power Supply............................................................................................... 3-15

2. MECHANICS ......................................................................................................... 3-16

2.1 Overview of Printing Mechanism.................................................................................... 3-16

2.2 Paper Transfer ...............................................................................................................3-18

2.2.1 Paper supply..................................................................................................................... 3-18

2.2.2 Paper registration ............................................................................................................. 3-18

2.2.3 Paper eject........................................................................................................................ 3-19

2.2.4 Duplex printing.................................................................................................................. 3-19

2.3 Sensors .......................................................................................................................... 3-20

2.3.1 Cover sensors................................................................................................................... 3-20

2.3.2 Toner sensors................................................................................................................... 3-20

2.3.3 DX tray sensor / DX paper size sensor............................................................................. 3-21

2.3.4 Rear cover sensor ............................................................................................................ 3-21

2.3.5 Cassette sensor / Paper empty sensor............................................................................. 3-22

2.3.6 Paper eject sensor............................................................................................................ 3-22

2.4 Drum Unit ....................................................................................................................... 3-23

2.4.1 Photosensitive drum ......................................................................................................... 3-23

2.4.2 Primary charger ................................................................................................................ 3-23

2.4.3 Transfer roller ................................................................................................................... 3-23

2.4.4 Cleaner ............................................................................................................................. 3-23

2.5 Toner Cartridge ..............................................................................................................3-23

2.6 Print Process.................................................................................................................. 3-23

2.6.1 Charging ........................................................................................................................... 3-23

2.6.2 Exposure stage................................................................................................................. 3-24

2.6.3 Developing........................................................................................................................ 3-25

2.6.4 Transfer ............................................................................................................................ 3-25

2.6.5 Fixing stage ...................................................................................................................... 3-26

CHAPTER 4 DISASSEMBLY AND RE-ASSEMBLY.............................. 4-1

1. SAFETY PRECAUTIONS ........................................................................................4-1

2. DISASSEMBLY FLOW ............................................................................................4-2

3. DISASSEMBLY PROCEDURE ................................................................................4-3

3.1 AC Cord ........................................................................................................................... 4-3

3.2 Drum Unit ......................................................................................................................... 4-3

3.3 Paper Cassette ................................................................................................................ 4-4

3.4 Network Board (For HL-1870N only).............................................................................. 4-11

3.5 Top Cover ...................................................................................................................... 4-12

3.6 DX Feed ASSY............................................................................................................... 4-16

3.7 Rear Cover..................................................................................................................... 4-20

3.8 Rear Cover R & L / Side Cover R & L ............................................................................ 4-22

3.9 MP Cover ASSY............................................................................................................. 4-23

iv

HL-1850/1870N SERVICE MANUAL

3.10 Process Unit Cover ASSY.............................................................................................. 4-25

3.11 Laser Unit....................................................................................................................... 4-26

3.12 Fixing Unit ...................................................................................................................... 4-27

3.13 Paper Pick-up Roller ASSY............................................................................................ 4-39

3.14 Feed MP Unit ................................................................................................................. 4-40

3.15 Drive Unit ....................................................................................................................... 4-42

3.16 Low-voltage Power Supply PCB ASSY.......................................................................... 4-47

3.17 Main PCB ASSY............................................................................................................. 4-48

3.18 Fan Motor / Fan Motor 60 .............................................................................................. 4-48

3.19 Base Plate...................................................................................................................... 4-49

3.20 Engine PCB ASSY / High-voltage Power Supply PCB ASSY........................................ 4-49

3.21 DX Sensor PCB ASSY................................................................................................... 4-51

3.22 Toner Sensor PCB Unit (Light Reception) ..................................................................... 4-52

3.23 Toner LED PCB Unit (Light Emission) ........................................................................... 4-52

3.24 Paper Feed Roller ASSY................................................................................................ 4-53

3.25 First Feed Roller ASSY .................................................................................................. 4-53

3.26 Exit Roller Unit................................................................................................................ 4-55

3.27 Harness Winding Form .................................................................................................. 4-57

4. PACKING ..............................................................................................................4-58

CHAPTER 5 PERIODIC MAINTENANCE............................................... 5-1

1. CONSUMABLE PARTS...........................................................................................5-1

1.1 Drum Unit ......................................................................................................................... 5-1

1.2 Toner Cartridge ................................................................................................................ 5-2

2. PERIODICAL REPLACEMENT PARTS...................................................................5-5

3. PERIODICAL CLEANING........................................................................................5-6

3.1 Cleaning the Printer Exterior ............................................................................................ 5-6

3.2 Cleaning the Drum Unit .................................................................................................... 5-6

3.3 Cleaning the Scanner Window ......................................................................................... 5-7

3.4 Cleaning the Electrical Terminals..................................................................................... 5-8

4. MTBF / MTTR..........................................................................................................5-9

CHAPTER 6 TROUBLESHOOTING ....................................................... 6-1

1. INTRODUCTION .....................................................................................................6-1

1.1 Initial Check...................................................................................................................... 6-1

1.2 Warnings for Maintenance Work ...................................................................................... 6-2

1.3 Identify the Problem .........................................................................................................6-3

2. OPERATOR CALLS & SERVICE CALLS ................................................................6-4

2.1 Operator Calls .................................................................................................................. 6-4

2.2 Service Calls .................................................................................................................... 6-6

3. PAPER PROBLEMS................................................................................................6-9

3.1 Paper Loading Problems.................................................................................................. 6-9

3.2 Paper Jams .................................................................................................................... 6-10

3.2.1 Clearing jammed paper..................................................................................................... 6-11

v

TABLE OF CONTENTS

3.2.2 Causes & countermeasures.............................................................................................. 6-19

3.3 Paper Feeding Problems ............................................................................................... 6-20

4. SOFTWARE SETTING PROBLEMS .....................................................................6-22

5. MALFUNCTIONS ..................................................................................................6-25

6. IMAGE DEFECTS .................................................................................................6-31

6.1 Image Defect Examples ................................................................................................. 6-31

6.2 Troubleshooting Image Defect ....................................................................................... 6-32

6.3 Location of Grounding Contacts..................................................................................... 6-50

6.3.1 Drum unit .......................................................................................................................... 6-50

6.3.2 Printer body & Paper cassette .......................................................................................... 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 Server (TCP/IP) Troubleshooting ..................................................... 6-57

8.6 Windows 95/98/Me (or later) Peer to Peer Print (LPR) Troubleshooting ....................... 6-57

8.7 Windows 95/98/Me (or later) Peer to Peer (HP JetAdmin Compatible Method) Troubleshooting .....

....................................................................................................................................... 6-58

8.8 Windows 95/98/Me/NT 4.0/2000 (or later) Peer to Peer Print (NetBIOS) Troubleshooting ...

....................................................................................................................................... 6-58

8.9 Internet Print (TCP/IP) Troubleshooting ......................................................................... 6-58

8.10 Novell Netware Troubleshooting .................................................................................... 6-59

8.11 AppleTalk Troubleshooting ............................................................................................ 6-59

8.12 Apple TCP/IP Printing (System 8.6 or later)................................................................... 6-60

8.13 Web Browser Troubleshooting (TCP/IP)........................................................................ 6-60

9. INSPECTION MODE .............................................................................................6-61

9.1 Entering Inspection Mode .............................................................................................. 6-61

9.2 Sensor Check Mode....................................................................................................... 6-62

CHAPTER 7 HIDDEN FUNCTIONS ........................................................ 7-1

1. ENTERING HIDDEN FUNCTION MENU MODES ...................................................7-1

2. PROFESSIONAL MENU MODE..............................................................................7-2

2.1 Enabling and Disabling Professional Menu Mode............................................................ 7-2

2.2 Function Table ................................................................................................................. 7-3

3. SERVICE MENU MODE..........................................................................................7-7

3.1 Entering the Service Menu Mode ..................................................................................... 7-7

3.2 Function Table ................................................................................................................. 7-7

4. OTHER HIDDEN FUNCTION MENUS ....................................................................7-9

4.1 Hidden Function Menus Enabled by Pressing Switch(es) When Turning the Machine on ....

......................................................................................................................................... 7-9

4.2 Drum Life Reset Function ................................................................................................ 7-9

4.3 Parts life Reset Function .................................................................................................. 7-9

vi

HL-1850/1870N SERVICE MANUAL

APPENDICES

1. CONNECTION DIAGRAM, HL-1850/1870N........................................................... A-1

2. MAIN PCB CIRCUIT DIAGRAM, HL-1850/1870N (1/6) .......................................... A-2

3. MAIN PCB CIRCUIT DIAGRAM, HL-1850/1870N (2/6) .......................................... A-3

4. MAIN PCB CIRCUIT DIAGRAM, HL-1850/1870N (3/6) .......................................... A-4

5. MAIN PCB CIRCUIT DIAGRAM, HL-1850/1870N (4/6) .......................................... A-5

6. MAIN PCB CIRCUIT DIAGRAM, HL-1850/1870N (5/6) .......................................... A-6

7. MAIN PCB CIRCUIT DIAGRAM, HL-1850/1870N (6/6) .......................................... A-7

8. ENGINE PCB CIRCUIT DIAGRAM, HL-1850/1870N (1/2) ..................................... A-8

9. ENGINE PCB CIRCUIT DIAGRAM, HL-1850/1870N (2/2) ..................................... A-9

10. NETWORK BOARD PCB CIRCUIT DIAGRAM, HL-1850/1870N.......................... A-10

11. LOW-VOLTAGE POWER SUPPLY PCB CIRCUIT DIAGRAM (100V) ................. A-11

12. LOW-VOLTAGE POWER SUPPLY PCB CIRCUIT DIAGRAM (200V) ................. A-12

13. HIGH-VOLTAGE POWER SUPPLY PCB CIRCUIT DIAGRAM ............................ A-13

14. SERIAL NO. DESCRIPTIONS.............................................................................. A-14

15. DIAMETER / CIRCUMFERENCE OF ROLLERS.................................................. A-16

16. PRINT SPEEDS WITH VARIOUS SETTINGS...................................................... A-17

17. HOW TO KNOW DRUM UNIT LIFE & PAGE COUNTER .................................... A-18

18. HOW TO USE THE SELF-DIAGNOSTICS TOOLS ............................................. A-23

19. NVRAM DEFAULT VALUE................................................................................... A-27

20. PAPER CASSETTE INFORMATION (FOR EUROPE ONLY)............................... A-28

21. GUIDELINES FOR LEAD FREE SOLDER (MAIN PCB ASSY) .......................... A-29

22. HOW TO REWRITE HL-1850/1870N FLASH ROM ............................................. A-30

INDEX

vii

REGULATION

REGULATION

LASER SAFETY (110 - 120V MODEL ONLY)

This printer is certified as a Class 1 laser product under the US Department of Health and
Human Services (DHHS) Radiation Performance Standard according to the Radiation
Control for Health and Safety Act of 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 - 120V MODEL ONLY)

The US Food and Drug Administration (FDA) has implemented regulations for laser
products manufactured on and after August 2, 1976. Compliance is mandatory for
products marketed in the United States. One of the following labels on the back of the
printer indicates compliance with the FDA regulations and must be attached to laser
products marketed in the United States.

The label for Japanese manufactured products

MANUFACTURED: K
BROTHER INDUSTRIES, LTD.

15-1, Naeshiro-cho, Mizuho-ku, Nagoya 467-8561,
Japan.
This product complies with FDA radiation performance
standards, 21 CFR Subchapter J.

The label for Chinese manufactured products

MANUFACTURED: C
BROTHER Corporation (Asia) Ltd.
Shenzen Buji Nan Ling Factory

Gold Garden Ind., Nan Ling Village, Buji, Rong Gang,
Shenzen, CHINA
This product complies with FDA radiation performance
standards, 21 CFR Subchapter J.

Caution

Use of controls, adjustments or performance of procedures other than those specified in
this manual may result in hazardous radiation exposure.

viii

HL-1850/1870N SERVICE MANUAL

IEC 825 (220-240V MODEL ONLY)

This printer is a Class 1 laser product as defined in IEC 825 specifications. The label
shown below is attached in countries where required.

This printer has a laser diode which emits invisible laser radiation in the Laser Unit. The
Laser Unit should not be opened without disconnecting the two connectors connected with
the AC power supply and laser unit. Since the variable resistor in the laser unit is adjusted
in accordance with the standards, never touch it.

Caution

Use of controls, adjustments or performance of procedures other than those specified in
this manual may result in hazardous radiation exposure.

For Finland and Sweden
LUOKAN 1 LASERLAITE
KLASS 1 LASER APPARAT

Varoitus! Laitteen käyttäminen muulla kuin tässä käyttöohjeessa mainitulla tavalla saattaa
altistaa käyttäjän turvallisuusluokan 1 ylittävälle näkymättömälle lasersäteilylle.

Varning  Om apparaten används på annat sätt än i denna Bruksanvisning specificerats,
kan användaren utsättas för osynlig laserstrålning, som överskrider gränsen för laserklass

1.

ix

SAFETY INFORMATION

CAUTION FOR LASER PRODUCT (WARNHINWEIS FUR LASER DRUCKER)

CAUTION: When the machine during servicing is operated with the cover open, the

CAUTION: In case of any trouble with the laser unit, replace the laser unit itself. To

ACHTUNG: Im Falle von Störungen der Lasereinheit muß diese ersetzt werden. Das

<Location of the laser beam window>

SAFETY INFORMATION

regulations of VBG 93 and the performance instructions for VBG 93 are
valid.

prevent direct exposure to the laser beam, do not try to open the enclosure
of the laser unit.

Gehäuse der Lasereinheit darf nicht geöffnet werden, da sonst
Laserstrahlen austreten können.

ADDITIONAL INFORMATION

When servicing the optical system of the printer, be careful not to place a screwdriver or
other reflective object in the path of the laser beam. Be sure to take off any personal
accessories such as watches and rings before working on the printer. A reflected beam,
though invisible, can permanently damage the eyes.

Since the beam is invisible, the following caution label is attached on the laser unit.

x

CAUTION
ADVARSEL
VARNING
VARO!

ADVARSEL
ATTENTION
VORSICHT

ATENCIÓN

INVISIBLE LASER RADIATION WHEN OPEN AND INTERLOCK DEFEATED.
AVOID DIRECT EXPOSURE TO BEAM. CLASS 3B LASER PRODUCT.

USYNLIG LASER STRÅLING NÅR KABINETLÅGET STÅR ÅBENT.
UNGDÅ DIREKTE UDSÆTTELSE FOR STRÅLING. KLASSE 3B LASER.

OSYNLIG LASERSTRÅLNING NÄR DENNA DEL ÄR ÖPPNAD OCH SPÄRRAR
ÄR URKOPPLADE. STRÅLEN ÄR FARLIG. KLASS 3B LASER APPARAT.

AVATTAESSA JA SUOJALUKITUS OHITETTAESSA OLET ALTTIINA
NÄKYMÄTTÖMÄLLE LASERSÄTEILYLLE. ÄLÄ KATSO SÄTEESEEN. LUOKAN
3B LASERLAITE.

USYNLIG LASERSTRÅLING.UNNGÅ DIREKTE KONTAKT MED LASERENHETEN
NÅR TOPPDEKSELET ER ÅPENT. KLASSE 3B LASERPRODUKT.

RADIATIONS LASER INVISIBLES QUANDOUVERT ET VERROUILLAGE ENLEVE.
EVITER EXPOSITIONS DIRECTES AU FAISCEAU. PRODUIT LASER CLASSE 3B.

UNSICHTBARE LASERSTRAHLUNG WENN ABDECKUNG
GEÖFFENT UND SICHERHEITSVERRIEGELUNG
ÜBERBRÜCKT. NICHT DEM STRAHL AUSSETZEN.
SICHERHEITSKLASSE 3B.

RADIACIÓN LASER INVISIBLE CUANDO SE ABRE
LA TAPA Y EL INTERRUPTOR INTERNO ESTÁ
ATASCADO. EVITE LA EXPOSICIÓN DIRECTA
DE LOS OJOS. PRODUCTO LASER CLASE 3B.

HL-1850/1870N SERVICE MANUAL

xi

SAFETY INFORMATION

DEFINITIONS OF WARNINGS, CAUTIONS AND NOTES

The following conventions are used in this service manual:

Indicates warnings that must be observed to prevent possible personal injury.

!

Indicates cautions that must be observed to service the printer properly or prevent damage
to the printer.

NOTE:

Indicates notes and useful tips to remember when servicing the printer.

**Listed below are the various kinds of WARNING messages included in this manual.

WARNING

CAUTION:

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 extremely hot immediately after the printer is used.
When opening the front cover or rear cover to access any parts inside the printer,
never touch the red colored parts shown in the following figures.

WARNING

If you analyze malfunctions with the power plug inserted into the power outlet,
special caution should be exercised even if the power switch is OFF because it is a
single pole switch.

xii

HL-1850/1870N SERVICE MANUAL

xiii

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) print speed for A4 and 19
pages per minutes (ppm) print speed for Letter paper.

Versatile Paper Handling

The printer loads paper automatically from the paper cassette. The paper cassette can hold
A4, letter, B5 (ISO), B5 (JIS), A5, B6 (ISO), A6, Executive and Legal sizes of paper. The
manual feed slot allows manual paper loading sheet by sheet so you can use a variety of types
and sizes of paper.

HL-1850/1870N SERVICE MANUAL

Front Operation

Basic operation of the printer can be controlled from the control panel.

Enhanced Printing Performance and User-Friendly Operation for Windows

The dedicated printer driver for Microsoft Windows 95/98/Me, Windows NT 4.0 and
Windows
install them into your Windows
unique compression mode to enhance printing speed in Windows



2000/XP are available on the CD-ROM supplied with your printer. You can easily



system using our installer program. The driver supports our



applications and allows you



to choose various printer settings including toner save mode, custom paper size, sleep mode,
gray scale adjustment, resolution, water mark and many layout functions. You can easily
setup these print options through the Printer Setup Menu.

Printer Status Monitor with Bi-directional Parallel Interface

The printer driver can monitor the status of your printer using bi-directional parallel
communications. IEEE-1284 bi-directional parallel printer cable is recommended.

The printer status monitor program can show the current status of your printer. When printing,
the animated dialog box appears on your computer screen to show the current printing
process. If an error occurs, a dialog box will appear to let you know what to correct. If you
have turned on the interactive Help (Windows



95/98 only) you can get visual guidance on

your PC screen on the actions in the event of certain printer errors.

Quick Print Setup

The Quick Print Setup is a convenient utility to allow you to make changes to frequently used
driver settings easily without having to open the printer properties selection box every time. It
is launched automatically when this printer driver is selected. You can change the settings by
clicking on the icon with the right mouse button.

Enhanced Memory Management

The printer provides its own data compression technology in its printer hardware and the
supplied printer driver software, which can automatically compress graphic data and font data
efficiently into the printers memory. You can avoid memory errors and print most full page 600
dpi graphic and text data, including large fonts, with the standard printer memory.

1-1

CHAPTER 1 GENERAL

USB Interface (for Windows



98 / 2000/XP, iMac and Power Macintosh)

The printer can be connected using the Universal Serial Bus (USB) interface to a PC or Mac
which has a USB interface. Drivers that allow you to use the USB port are provided on the
CD-ROM supplied with the printer.

Popular Printer Emulation Support

These printers support the following printer emulation modes;

HP LaserJet (PCL6), PostScript Level 3 language emulation (Brother BR-Script Level 3),

Epson 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.
If you want to set the printer emulation, you can do it using the Remote Printer Console
Program.

High Resolution Control & Advanced Photoscale Technology

High Resolution Control (HRC) technology provides clear and crisp printouts. Use this function
to get smooth text print quality.

Advanced Photoscale Technology (APT) enables the printer to print graphics in 256
grayscales, producing nearly photographic quality. Use this function when you want to print
photographic images.

Environment-Friendly

<Economy Printing Mode>
This feature will cut your printing cost by saving toner. It is useful for obtaining draft copies for
proof-reading. You can select the 50% toner saving economy mode through the Windows



printer driver supplied with your printer.

<Sleep Mode (Power Save Mode)>
Sleep mode automatically reduces power consumption when the printer is not in use for a
certain period of time. The printer consumes less than 12W when in sleep mode.

<Low Running Cost>

Since the toner cartridge is separate from the drum unit, you need to replace only the toner
cartridge after printing around 6,500 pages at 5% coverage for A4 paper for the standard
cartridge, which is both cost effective and ecologically friendly.

Bar Code Print

The printer can print the following 11 types of bar codes;

Code 39

•

Code 128

•

Interleaved 2 of 5

•

Codabar

•

US-PostNet

•

ISBN

•

UPC-A

•

UPC-E

•

EAN-8

•

EAN-13

•

EAN-128

•

Network Feature (for HL-1870N only)

The Brother printer has built in multi protocol network capability as standard. This allows
multiple host computers to share the printer on a 10/100Mbit Ethernet network. Any users can
print their jobs as if the printer was directly connected to their computer. Users on Windows

®

95/98/Me, Windows® NT, Windows® 2000/XP, UNIX, Novell, Apple Macintosh, LAN server and
OS/2 Warp server computer simultaneously can access this printer. For further information,
see the Network Users Guide supplied with the printer.

1-2

2. OVERVIEW

<Front View>

HL-1850/1870N SERVICE MANUAL

Extension flap

Front cover

Multi-purpose tray extension

<Rear View>

Face down output tray

Multi-purpose tray

Control panel

Cover release button

Paper cassette

Fig. 1-1

Parallel interface connector

Face up output tray
Face up tray extension

Paper adjustment lever

Interface cover

Duplex tray

USB connectorPCB access plate

Power switch

Fig. 1-2

AC power inlet

for duplex printing

1-3

CHAPTER 1 GENERAL

3. SPECIFICATIONS

3.1 Printing

Print method Electrophotography by semiconductor laser beam scanning

Laser Wavelength: 780 nm

Output: 5mW max

Resolution HQ1200 (for Windows

®

95/98/Me, WindowsNT® 4.0, Windows

2000/XP, and Mac OS)

600 dpi (for Windows

®

95/98/Me, WindowsNT® 4.0, Windows

2000/XP, DOS and Mac OS)

300 dpi (for Windows

®

95/98/Me, WindowsNT® 4.0, Windows

2000/XP, and Mac OS)

Print quality Normal printing mode

Economy printing mode (up to 25% and 50% toner saving)

Print speed Normal: Up to 18 pages/minute (A4)

UP to 19 pages/minute (Letter-size paper)

Duplex printing: Up to 8.5 pages/minute*
(when loading A4 or Letter-size paper from the standard paper
cassette.)

Warm-up Max. 20 seconds at 23°C (73.4°F)

First print Max. 12 seconds

(when 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 the paper size or media type. For details, refer to APPENDIX

16 PRINT SPEEDS WITH VARIOUS SETTINGS.

1-4

3.2 Functions

CPU Fujitsu MB86834 100MHz

HL-1850/1870N SERVICE MANUAL

Emulation 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 XL

Printer driver <PCL Driver>

Windows



95/98/Me, Windows NT 4.0, Windows® 2000/XP driver,

supporting Brother Native Compression mode

<PS Driver>
PPD file driver for Windows



95/98/Me, Windows NT 4.0, Windows®

2000/XP driver and Macintosh driver

<Others>

• iMac, Power Macintosh with USB printer driver

• Optional Macintosh driver available for System 6.0.7 or higher

Interface • Bi-directional parallel

• Universal Serial Bus (USB)

• 10/100 BaseTX Ethernet network interface (optional for HL-1850)

• Optional IrDA

Memory HL1850: 16 Mbytes

HL1870N: 32 Mbytes

Expandable up to 136 Mbytes for HL1850 and 144 Mbytes for
HL1870N by installing an industry standard DIMM*



Control Panel • Display LCD: 1 line, 16 digit, 3 color

LED: 1 LED

• Buttons 7 keys

Diagnostics Self-diagnostic program

*NOTE:

The DIMM must have the following specifications;
Type: 100 pin
Access time: 60 nsec - 80 nsec
Capacity: 16, 32, 64, 128 Mbyte
Height: 35.0 mm (1.38 inches) or less
Output: 32 bit or 36 bit (independent of parity)

1-5

CHAPTER 1 GENERAL

3.3 Electrical and Mechanical

Power source U.S.A. and Canada: AC 110 to 120V, 50 Hz/60 Hz

Power consumption Printing (average): 410 W or less

10 W or less (for HL-1870N)

Noise Printing: 50dB A or less

Temperature Operating: 10 to 32.5°C (50 to 90.5°F)

Humidity Operating: 20 to 80% (non condensing)

Dimensions 425 x 424 x 275 mm
(W x D x H) (16.7 x 16.7 x 10.8 inches)

Europe and Australia: AC 220 to 240V, 50 Hz/60 Hz

Standing by: 70 W or less
Sleep*: 9 W or less (for HL-1850)

Standing by: 30dB A or less

Non operating: 0 to 40°C (38 to 104°F)
Storage: -20 to 40°C (-4 to 104°F)

Storage: 10 to 85% (non condensing)

A4 lower paper cassette installed: 425 x 424 x 384 mm

(16.7 x 16.7 x 15.1 inches)

Weight Approx. 14.5 kg (32.2 lb.) including the drum unit.

Approx. 18.7 kg (41.6 lb.) including the drum unit and the optional
lower tray unit.

*NOTE:

• The power consumption figure quoted for sleep mode is when the fan has stopped.

1-6

3.4 Network

Type / Speed 10/100 Base TX Ethernet

Protocols TCP/IP (RARP, BOOTP, DHCP, NetBIOS, WINS, LPR/LPD, Port9100,

Management • Web Based Management (HTTPD)

Firmware update Flash ROM based for Network module

HL-1850/1870N SERVICE MANUAL

Automatic negotiation

POP3/SMTP, SMB, User definable port, IPP, FTP, TELNET, SNMP,
HTTP, TFTP), Netware IPX/SPX (Bindey and NDS), Appletalk,
DLC/LLC, NetBEUI, DEC LAT, Banyan VINES

• BRAdmin Professional (using TCP/IP protocol and IPX/SPX)

• SNMP, MIB II as well as Brother private MIB

• TELNET command console (NIC only)

• HP JetAdmin compatible

• BRCONFIG DOS Utility (NIC only, needs Netware network)

• Front Panel Configuration (if the printer has LCD panel)

• Can be upgraded using TFTP

• Can be upgraded using IPX/SPX

• Easy upgrade using Brother BRAdmin utility

Supplied software • BRAdmin Professional management utility (for Windows

Windows

• Port driver for Windows

2000/XP

LPR port driver (for Windows



NT 4.0/Windows



2000/XP)



95/98, WindowsNT 4.0/Windows



95/98 only)
NetBIOS port driver
SMTP port driver



95/98,



1-7

CHAPTER 1 GENERAL

3.5 Paper

3.5.1 Feedable paper

(1) Paper type

Paper type

Plain paper

60 g/m

2

to 105 g/m

(16 to 28 lbs.)

Recycled paper

Bond paper

Thick paper

105 g/m

2

to 161 g/m

(28 to 43 lbs.)

Transparency

Label

Envelope

Card

2

2

Upper
paper

tray

Multi-

purpose

tray

Optional

lower

tray

Duplex

printing

○○○○

○○○○

○

○

○

Up to 10
sheets

○

Only A4
or Letter
size

○

Only A4
or Letter
size

○

○

Select the paper
type from the
printer driver

Plain paper

Plain paper

Bond paper

Thick paper
or thicker paper

Transparencies

Plain paper

Envelopes

or Env.Tick

or Env.Thin

Thick paper
or thicker paper

(2) Paper size

Upper

paper tray

A4, Letter, Legal,

8.5x13 in., B5 (JIS),
B5 (ISO), Executive,

Paper size

A5, A6, B6

(3) Other paper specifications

<Paper cassette>

Basis weight 60 to 105 g/m

Multi-purpose

tray

Width:
70 to 216 mm
(2.75 to 8.5 in.)

Length:
116 to 356 mm
(4.57 to 14.0 in.)

Cut sheet

2

(16 to 28 lb.)

1-8

Optional lower

tray

A4, Letter,
Legal, B5 (JIS),
B5 (ISO),
Executive, A5

Duplex

printing

A4,
Letter,
Legal

HL-1850/1870N SERVICE MANUAL

Caliper 0.08 to 0.13 mm (0.003 to 0.005 in.)

Moisture content 4% to 6% by weight

<Multi-purpose tray>

Cut sheet Envelope

2

Basis weight 60 to 161 g/m

(16 to 43 lb.) 75 to 90 g/m2 (20 to 24 lb.)

single thickness

Caliper 0.08 to 0.2 mm (0.003 to 0.008 in.) 0.084 to 0.14 mm (0.003 to 0.005 in.)

single thickness

Moisture

4% to 6% by weight 4% to 6% by weight

content

(4) Recommended paper

Europe USA

Plain paper Xerox Premier 80 g/m

Xerox Business 80 g/m

IGEPA X-Press 80 g/m

2

2

2

Recycled paper Steinbis Recycling Copy 80 g/m

Xerox 4200DP 20 lb

Champion Paper One 20 lb

Hammermill Laser Paper 24 lb

2

Transparency 3M CG3300 3M CG 3300

Label Avery laser label L7163 Avery laser label #5160

CAUTION:

!

When you are choosing print media, be sure to follow the information given below to prevent
any paper jams, print quality problems or printer damage;

• It is recommended to use long-grained paper for the best print quality. If short-grained

paper is being used, it might be the cause of paper jams.

• Use neutral paper. Do not use acid paper to avoid any damage to the drum unit.

• Avoid using coated paper such as vinyl coated paper.

• Avoid using preprinted or highly textured paper.

• It is recommended to use labels or transparencies which are designed for use in laser

printers.

• Avoid feeding labels with the carrier sheet exposed, or the printer will be damaged.

• Before loading paper with holes such as organizer sheets, be sure to fan the stack well.

• Do not use organizer sheets that are stuck together. The glue that is used might caused

damaged to the printer.

• When printing on the back of pre-printed paper, if the paper is curled, be sure to straighten

the paper as much as possible.

• Different types of paper should not be loaded at the same time in the paper cassette to

avoid any paper jams or misfeeds.

1-9

CHAPTER 1 GENERAL

3.5.2 Paper cassette capacity

Paper

Capacity

3.5.3 Print delivery

(1) Face down output tray

capacity: Maximum 150 sheets (80 g/m

(2) Face up output tray

capacity: Maximum 50 sheets (80 g/m

NOTE:

Face-down: Delivery with the printed face of the paper downwards.
Face-up: Delivery with the printed face of the paper upwards.

Upper

paper tray

250 sheet

(80 g/m

2

or 20 lbs.)

face down only

face up only

Multi-purpose

tray

100 sheets

2

(80 g/m

or 20 lbs.)

Legal: 30

8.5x13 in.: 30

Label stock: 10

Optional lower tray

250 sheets

(80 g/m

2

)

2

)

2

or 20 lbs.)

(3) We recommend the following print methods (output tray) for each paper media type.

Paper output

Media type

Face down Face up

Plain paper

Thick paper

Recycled paper

Transparency

Label

Envelope

Card

○○

○

○

○

○

○
○
○

1-10

3.6 Printable Area

3.6.1 PCL5e/EPSON/IBM emulation

The figure below shows the printable area each emulation guarantees when printing on Portrait
and Landscape.

Portrait

ʝ

G

HL-1850/1870N SERVICE MANUAL

ʝ

F

Physical page

Printable area

Logical page

ʝ

ʝ

E

ʝ

G

E

ʝ

B

ʝ

D

ʝ

G

ʝ

B

ʝ

D

ʝ

F

Physical page length

Maximum logical page length

DIstance from edge of physical page to
edge of logical page

ʝ

F

ʝ

G

ʝ

C

ʝ

A

ʝ

ʝ

ʝ

ʝ

ʝ

ʝ

ʝ

1-11

CHAPTER 1 GENERAL

The table below shows the printable areas when printing on Portrait 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

NOTE:

• The paper sizes indicated here should confirm to the nominal dimensions specified by JIS

except B5 (ISO).

• The dot size is based on 300 dpi resolution.

215.9 mm

8.5
(2,550 dots)

215.9 mm

8.5
(2,550 dots)

184.15 mm

7.25
(2,175 dots)

210.0 mm

8.27
(2,480 dots)

148.5 mm

5.85
(1,754 dots)

105.0 mm

4.13
(1,240 dots)

182.0 mm

7.1
(2,130 dots)

176.0 mm

6.93
(2,078 dots)

125.0 mm

4.92
(1,476 dots)

104.78 mm

4.125
(1,237 dots)

98.43 mm

3.875
(1,162 dots)

162.0 mm

6.38
(1,913 dots)

110.0 mm

4.33
(1,299 dots)

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
(3,507 dots)

210.0 mm

8.27
(2,480 dots)

148.5 mm

5.85
(1,754 dots)

257.0 mm

10.11
(3,033 dots)

250.0 mm

9.84
(2,952 dots)

176.0 mm

6.93
(2,078 dots)

241.3 mm

9.5
(2,850 dots)

190.5 mm

7.5
(2,250 dots)

229.0 mm

9.01
(2,704 dots)

220.0 mm

8.66
(2,598 dots)

203.2 mm

8.0
(2,400 dots)

203.2 mm

8.0
(2,400 dots)

175.7 mm

6.92
(2,025 dots)

198.0 mm

7.79
(2,338 dots)

136.5 mm

5.37
(1,612 dots)

93.0 mm

3.66
(1,098 dots)

170.0 mm

6.69
(2,007 dots)

164.0 mm

6.46
(1,936 dots)

164.0 mm

4.44
(1,334 dots)

92.11 mm

3.63
(1,087 dots)

85.7 mm

3.37
(1,012 dots)

150.0 mm

5.9
(1,771 dots)

98.0 mm

3.86
(1,157 dots)

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
(3,507 dots)

210.0 mm

8.27
(2,480 dots)

148.5 mm

5.85
(1,754 dots)

257.0 mm

10.11
(3,033 dots)

250.0 mm

9.84
(2,952 dots)

176.0 mm

6.93
(2.078 dots)

241.3 mm

9.5
(2,850 dots)

190.5 mm

7.5
(2,250 dots)

229.0 mm

9.01
(2,704 dots)

220.0 mm

8.66
(2,598 dots)

6.35 mm

0.25
(75 dots)

Ç

6.35 mm

0.25
(75 dots)

6.01 mm

0.24
(71 dots)

Ç

Ç

Ç

Ç

Ç

6.35 mm

0.25
(75 dots)

Ç

6.01 mm

0.24
(71 dots)

Ç

0 mm

0 mm

0 mm

0 mm

0 mm

0 mm

0 mm

0 mm

0 mm

0 mm

0 mm

0 mm

0 mm

4.2 mm

0.16
(50 dots)

4.2 mm

0.16
(50 dots)

4.2 mm

0.16
(50 dots)

4.2 mm

0.16
(50 dots)

4.2 mm

0.16
(50 dots)

4.2 mm

0.16
(50 dots)

4.2 mm

0.16
(50 dots)

4.2 mm

0.16
(50 dots)

4.2 mm

0.16
(50 dots)

4.2 mm

0.16
(50 dots)

4.2 mm

0.16
(50 dots)

4.2 mm

0.16
(50 dots)

4.2 mm

0.16
(50 dots)

1-12

Landscape

HL-1850/1870N SERVICE MANUAL

ʝ

ʝ

G

F

Physical page

Printable area

ʝ

ʝ

E

ʝ

G

E

ʝ

ʝ

B

D

ʝ

G

Logical page

B Physical page le ngth

D Maximum logical page length

ʝ

ʝ

ʝ

ʝ

ʝ

F D ista nce from edge of physical

ʝ

G

ʝ

C

ʝ

A

ʝ

F

page to edge of logical page

ʝ

1-13

CHAPTER 1 GENERAL

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

NOTE:

• The paper sizes indicated here should confirm to the nominal dimensions specified by JIS

except B5 (ISO).

• The dot size is based on 300 dpi resolution.

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
(3,507 dots)

210.0 mm

8.27
(2,480 dots)

148.5 mm

5.85
(1,754 dots)

257.0 mm

10.11
(3,033 dots)

250.0 mm

9.84
(2,952 dots)

176.0 mm

6.93
(2,078 dots)

241.3 mm

9.5
(2,850 dots)

190.5 mm

7.5
(2,250 dots)
229 mm

9.01
(2,704 dots)
220 mm

8.66
(2,598 dots)

215.9 mm

8.5
(2,550 dots)

215.9 mm

8.5
(2,550 dots)

184.15 mm

7.25
(2,175 dots)

210.0 mm

8.27
(2,480 dots)

148.5 mm

5.85
(1,754 dots)

105.0 mm

4.13
(1,240 dots)

182.0 mm

7.1
(2,130 dots)

176.0 mm

6.93
(2,078 dots)

125.0 mm

4.92
(1,476 dots)

104.78 mm

4.125
(1,237 dots)

98.43 mm

3.875
(1,162 dots)
162 mm

6.38
(1,913 dots)
110 mm

4.33
(1,299 dots)

269.3 mm

10.6
(3,180 dots)

345.5 mm

13.6
(4,080 dots)

256.6 mm

10.1
(3,030 dots)

287.0 mm

11.2
(3,389 dots)

200.0mm

7.87
(2,362 dots)

138.5 mm

5.45
(1,636 dots)

247.0 mm

9.72
(2,916 dots)

240.0 mm

9.44
(2,834 dots)

166.4 mm

6.55
(1,960 dots)

231.1 mm

9.1
(2,730 dots)

180.4 mm

7.1
(2,130 dots)

219.0 mm

8.62
(2,586 dots)

210.0 mm

8.26
(2,480 dots)

215.9 mm

8.5
(2,550 dots)

215.9 mm

8.5
(2,550 dots)

184.15 mm

7.25
(2,175 dots)

210.0 mm

8.27
(2,480 dots)

148.5 mm

5.85
(1,754 dots)

105.0 mm

4.13
(1,240 dots)

182.0 mm

7.1
(2,130 dots)

176.0 mm

6.93
(2,078 dots)

125.0 mm

4.92
(1,476 dots)

104.78 mm

4.125
(1,237 dots)

98.43 mm

3.875
(1,162 dots)
162 mm

6.38
(1,913 dots)
110 mm

4.33
(1,299 dots)

5.0 mm

0.2
(60 dots)

Ç

5.0 mm

0.2
(60 dots)

4.8 mm

0.19
(59 dots)

Ç

Ç

Ç

Ç

Ç

5.0 mm

0.2
(60 dots)

Ç

4.8 mm

0.19
(59 dots)

Ç

0 mm

0 mm

0 mm

0 mm

0 mm

0 mm

0 mm

0 mm

0 mm

0 mm

0 mm

0 mm

0 mm

4.2 mm

0.16
(50 dots)

4.2 mm

0.16
(50 dots)

4.2 mm

0.16
(50 dots)

4.2 mm

0.16
(50 dots)

4.2 mm

0.16
(50 dots)

4.2 mm

0.16
(50 dots)

4.2 mm

0.16
(50 dots)

4.2 mm

0.16
(50 dots)

4.2 mm

0.16
(50 dots)

4.2 mm

0.16
(50 dots)

4.2 mm

0.16
(50 dots)

4.2 mm

0.16
(50 dots)

4.2 mm

0.16
(50 dots)

3.6.2 PCL6/BR-Script3 emulation

You can not print within 4.2 mm (50dots in 300 dpi mode) on all four sides of the paper.

1-14

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).

• Do no share the same power circuit with other high-power appliances, particularly an air

conditioner, copier or shredder. If it is unavoidable that you must use the printer with these
appliances, it is recommended that you use an isolation transformer or a high-frequency
noise filter.

• Use a voltage regulator if the power source is not stable.

1.2 Environment

• The printer should be installed near a power outlet, which is easily accessible.

• The room temperature is maintained between 10°C and 32.5°C. The relative humidity is

maintained between 20% and 80%.

• The printer should be used in a well ventilated room.

• Place the printer on a flat, horizontal surface.

• Keep the printer clean. Do not place the printer in a dusty place.

• Do not place the printer where the ventilation hole of the printer is blocked. Keep

approximately 100 mm (4 inches) between the ventilation hole and the wall.

• Do not place the printer where it is exposed to direct sunlight. Use a blind or a heavy

curtain to protect the printer from direct sunlight when the printer is unavoidably set up near
a window.

• Do not place the printer near devices that contain magnets or generate magnetic fields.

• Do not subject the printer to strong physical shocks or vibrations.

• Do not expose the printer to open flames or salty or corrosive gasses.

• Do not place objects on top of the printer.

• Do not place the printer near an air conditioner.

• Keep the printer horizontal when carrying.

• Do not cover the slots in the side cover.

1.3 System Requirements for Brother Printer Solution for Windows

Check the following system requirements to setup and operate the printer using Brother
Printing Solution for Windows

Operating system Computer / Processor Memory

Windows



95

Windows 98

Windows Me

Windows NT 4.0

Windows 2000/XP



:

486DX / 66MHz or higher processor 24MB

Pentium 150MHz or higher processor 32MB

Pentium 150MHz or higher processor 32MB

Pentium 150MHz or higher processor 24MB

Pentium 133MHz or higher processor 64MB

2-1



CHAPTER 2 INSTALLATION AND 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)

CD-ROM

Fig. 2-1

NOTE:

Components may vary depending on the country.

Documents

AC cord

2-2

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

4.0, Windows® 2000/XP and Macintosh)Then, purchase the appropriate interface cable
(Parallel, USB or Network) for your computer. Most existing parallel cables support bi­directional communication, but some might have an incompatible pin assignment or may not be
IEEE 1284-compliant.

The installation programs for the hardware setup and driver installation are contained on the
supplied CD-ROM.

3.1 For All Users



For Windows

Turn on the PC power. Insert the supplied CD-ROM into the CD-ROM drive. The opening screen will
appear automatically

NOTE:

If the opening screen does not appear; click Start and select Run. Then, enter the CD-drive
letter and type \START.EXE (for example: D:\START.EXE).

users

®

95/98/Me, Windows NT

®

Select the language you want.

The main menu screen appears.

Click the Initial Setup icon. You can view the Initial Setup instructions.

For Macintosh users

(1) Turn on the Macintosh. Insert the CD-ROM into the CD-ROM drive.

(2) Click the Initial Setup & Maintenance Tutorial icon.

Select the language you want.

Click the Initial Setup icon. You can view the Initial Setup instructions.

2-3

CHAPTER 2 INSTALLATION AND BASIC OPERATION

3.1.1 Install the drum unit assembly

(1) Press the cover release button, and then open the front cover.

Unpack the drum unit assembly. Rock it from side to side 5 or 6 times to distribute the toner evenly
inside the assembly.

Fig. 2-2

Install the drum unit assembly into the printer.

Fig. 2-3

Close the front cover.

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 the adjusters to fit the paper size. Check that they
locate correctly into the slots.

Paper guide release lever

Universal guide
release lever

Fig. 2-4

NOTE:

For Legal or 8.5 x 13 in. paper, press the universal guide release lever to extend the rear of the
Paper cassette.

2-4

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.

Fig. 2-5

Re-install the paper cassette into the printer.

3.1.3 Print a test page

(1) Make sure the printer power switch is off. Connect the AC power cord to the printer. Do

not connect the interface cable.

Plug the AC power cord into an AC outlet. Turn the power switch on.

After the printer has finished warming up, the READY message appears.

Extend the tray
extension flap

READY

Data

Back

Reprint

Set

Job cancel

Go

Fig. 2-6

Press the Go switch. The printer prints a test page. Check that the test page printed correctly.

2-5

CHAPTER 2 INSTALLATION AND 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 parallel interface cable.

(3) Turn the printer power switch off.

Connect the interface cable to your PC, then connect it to the printer.

Turn the printer power switch on.

NOTE:

If Add New Hardware Wizard appears, click the Cancel button.

Click the Next button.

Click the Finish button. The setup is now complete.

For USB interface cable users

Start installing the driver before connecting the USB interface cable to the printer. If it has
been already connected, remove it.

NOTE:

When the Add New Hardware Wizard appears on the PC, click the Cancel button.

(1) Click Connect the interface cable and install the printer driver / utilities.

(2) Select the USB cable.

Click the Next button, and then click the OK button.

Make sure the printer power switch is on.

Connect the USB interface cable to the PC, and then connect it to the printer.

NOTE:

If The file brUSGcfg.exe on Brother USB Printer class message appears, click the
Browse button, and then select the CD-ROM drive. Select the DRIVER\WIN98MEUSB
directory, and then click the OK button.

Restart the computer.

For Windows

For Windows
printer port.

®

98/Me users: The setup is now complete.

®

2000/XP users: Follow the instructions below for setting the PC

2-6

®

For Windows

2000/XP users only

Click Start, Setting and then Printers.

Fig. 2-7

Select the Brother HL-1850/1870N series (copy2) icon.

HL-1850/1870N SERVICE 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 connecting the printer to a network, it is recommended to contact the system

administrator prior to installation.

• For the administrator: Configure the printer referring to the following instructions.

• For installing the driver on the PC, refer to the following instructions once the administrator

has configured the printer.

1. For the administrator

Install the BRAdmin Professional Configuration utility

The BRAdmin Professional software provides sophisticated network and printer management
capabilities for Brother and non-Brother products. By identifying potential problems before
they arise, and by addressing important IT requirements such as streamlined printer
configuration, mass configuration and enterprise-wide upgrades, the BRAdmin Professional
software plays an important role in printer network management.

(1) Insert the CD-ROM.

(2) Select the appropriate language.

(3) Click the Install Software icon.

(4) Select BRAdmin Professional. Install the BRAdmin Professional utility referring to the on-

screen instructions.

2-7

CHAPTER 2 INSTALLATION AND BASIC OPERATION

Driver Deployment Wizard: Useful utility for peer-to-peer users

Use the Brother 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.

To access the Driver Deployment Wizard:

(1) Insert the CD-ROM supplied with the printer.

(2) Click the Install Software icon and select the Driver Deployment Wizard.

2. Installing the driver

(1) Click the Connect the interface cable and install the printer driver / utilities.

Select the Network interface.

Turn the printer power switch off.

Connect the cable to your printer, and then connect it to a free port on your hub.

Turn the printer power switch on.

Click the Next button.

Select the Network shared printer or the Brother peer-to-peer network printer, and then click the
Next button.

Select the network connection style and follow the instructions below:

3. For Network shared printer users

Select the appropriate printer Queue or Sharename

(1) Select the current printers queue, and then click the OK button.

(2) Once the appropriate queue is specified, the printer driver will be installed.

(3) The setup is now completed.

Fig. 2-9

2-8

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

®

<For Windows

(1) Select LPR (Recommended) and then click the Next button.

(2) Enter a unique port name (ex. BLP1), and then click the OK button.

(3) Specify the printers IP address (or click the Browse button to see a list of printers), and

click the OK button.

95/98/Me users>

Fig. 2-10

(4) Click the Finish button and restart the PC. After the PC has restarted, setup is complete.

<For Windows NT

®

4.0/ Windows ® 2000/XP users>

(1) Select LPR (Recommended), and then click the Next button.

NOTE:

If the following screen appears, insert the Windows NT

Fig. 2-11

®

4.0 CD-ROM into the CD-ROM drive.

(2) Click the Next button.

(3) Enter the printers IP address and the port name BINARY_P1, then click the Next button.

(4) Click the Finish button and restart the PC. After your PC has restarted, setup is complete.

2-9

CHAPTER 2 INSTALLATION AND BASIC OPERATION

5. For Brother Peer-to-Peer network printer users (NetBIOS)

Configuring the NetBIOS port

(1) Select NetBIOS, and click the Next button.

(2) Enter a unique port name (ex. BNT1), and then click the OK button.

(3) Enter the path name (or click the Browse button to see a list of printers), and then click the

OK button.

(4) Click the Finish button and restart your PC. After the PC has restarted, setup is complete.

3.3 For Macintosh Users

For USB interface cable users

Connect the printer to the Macintosh and install the BR-Script PPD File

(1) Click Connect the interface cable & Install the driver/utility.

(2) Make sure the printer power switch is ON.

(3) Connect the USB interface cable to the Macintosh

(4) Follow the instructions on the screen.

(5) Open the Macintosh HD icon.

(6) For Mac

Open the Apple LaserWriter Software folder.

For Mac

Open the Utilities folder.

®

OS 8.6 to 9.04 Users; Open the Apple Extras folder.

®

OS 9.1 to 9.2 Users; Open the Applications.( Mac

®

, and then connect it to the printer.

®

OS 9) folder.

(7) Open the Desktop Printer Utility icon.

(8) Select Printer (USB), and then click the OK button.

(9) Click the Changebutton in PostScript Printer Description (PPD) file. Select Brother HL-

1850/1870N series, and then click the Select button.

(10) Click the Changebutton in USB Printer Selection. Select HL-1850/1870N series, and

then click the OK button.

(11) Click the Createbutton.

(12) Enter your printer name (HL-1850/1870N series), and then click the Save button.

(13) Select Quit from the File menu.

2-10

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 connect it to a free port on the hub.

(4) Turn the printer power switch on.

(5) Open the Chooser from the Apple Menu on the Macintosh.

(6) Click the LaserWriter8 * icon (If you need to change the network zone, select which zone

you want to use from the AppleTalk

®

zones list).

NOTE:

In the Chooser the name BRN_xxxxxx_P1_AT is appeared, where xxxxxx is the last six
digits of the Ethernet address. See Chapter 7 of the Network Users Guide for more
information.

(7) Click on the appropriate printer server and close the Chooser. The setup is now complete.

*

If the Apple LaserWriter8 driver is not already installed on your system, you can download it

from http://www.apple.com.

2-11

CHAPTER 2 INSTALLATION AND BASIC OPERATION

4. PRINTING METHODS

The printer provides two types of printing method; printing from the paper cassette and printing
from the multi-purpose tray.

4.1 Printing from the Paper Cassette

You can load plain paper, recycled paper or transparencies into the paper cassette. If paper is
loaded into the paper cassette, the printer automatically feeds paper sheet by sheet and ejects
the printed page into the output tray.

For the details on cassette loading, refer to subsection 3.1.2 Load paper into the paper

cassette in this chapter and subsection 3.5 Paper in CHAPTER 1.

4.2 Printing from Multi-purpose Tray

You can feed bond paper, thick paper, labels, envelopes or cards as well as plain paper,
recycled paper or transparencies into the multi-purpose tray. (For details on feedable paper,
see subsection 3.5 Paper in CHAPTER 1.)

NOTE:

• 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 more
information, see subsection 5. CONTROL PANEL OPERATION in this Chapter.

When using the multi-purpose tray, follow the steps below;

(1) Open the multi-purpose tray.

Fig. 2-12

(2) Unfold the multi-purpose tray extension.

Fig. 2-13 Fig. 2-14

2-12

HL-1850/1870N SERVICE MANUAL

(3) Place paper in the multi-purpose tray so it

touches the back of the tray and remains below
the limit mark.

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/m

2

(36 lbs), use the face up output

tray.

• Insert the leading edge of the paper first and push it gently into the tray.

• If pre-printed paper is used in the multi-purpose tray, the paper should be inserted top

edge first with the printed side face up.

(4) Press and slide the paper width adjuster to fit the

paper.

(5) Use the face down output tray for printing on

transparencies.

(6) Change the settings in the printer driver properties tab.

Fig. 2-16

Fig. 2-17

2-13

CHAPTER 2 INSTALLATION AND BASIC OPERATION

4.2.1 Printing on envelopes (Face up printing)

Use of any of the envelopes listed below may cause damage to the printer. Such damage is
not covered under any warranty or service agreement.

• Envelopes that are damaged, curled, wrinkled, or irregularly shaped

• Envelopes that are extremely shiny or highly textured

• Envelopes with clasps, snaps or tie strings

• Envelopes with self-adhesive closures

• Envelopes of baggy construction

• Envelopes that are not sharply creased

• Embossed envelopes

• Envelopes that were previously printed by a laser printer

• Envelopes that are pre-printed on the inside

• Envelopes that cannot be arranged uniformly when placed in a pile

• Envelopes constructed with paper that exceeds the paper weight specifications for the

printer.

• Poorly manufactured envelopes with edges that are not straight or consistently square.

• Envelopes with transparent windows, holes, cutouts or perforations.

NOTE:

• Before printing envelopes, fan the stack well to avoid paper jams and misfeeds.

• Do not load different types of paper at the 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
information, see subsection 5. CONTROL PANEL OPERATION in this Chapter.

When printing on envelopes, follow the steps below;

(1) Open the multi-purpose tray.

(2) Unfold the multi-purpose tray extension.

(3) Open the face up output tray.

Fig. 2-18 Fig. 2-19

(4) Place envelopes in the multi-purpose tray so

they touch the back of the tray and remain below
the limit mark.

2-14

Fig. 2-20

HL-1850/1870N SERVICE MANUAL

NOTE:

Note the following when placing paper on the multi-purpose tray:

• Insert the leading edge of the paper first and push 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 11 mm (or 0.43 inch).

• The printed side must be face up.

(5) Press and slide the paper width adjuster to fit the

envelope size.

Fig. 2-21

NOTE:

• Make sure that neatly stacked envelopes are correctly seated in the multi-purpose tray

otherwise envelopes may not be fed correctly, resulting in skewed printouts or paper
jams.

• When printing, the inside tray automatically rises to feed envelopes into the printer.

(6) Change the settings in the printer driver Property tab.

NOTE;

• If DL size double-flap envelopes were creased after they have been printed, put in new

DL size double-flap envelopes sideways, and print again.

4.2.2 Printing on label, transparency, etc.

Use of any of the types of paper listed below may cause damage to your printer. Such
damage is not covered under any warranty or service agreement.

• Envelopes that are damaged, curled, wrinkled, or irregularly shaped

NOTE:

• Before using paper with holes, such as organizer sheets, make sure to fan the stack well

to avoid paper jams and misfeeds.

• Do not use paper with perforations at the edges.

• Do not place the punch hole near the actuator (paper sensor).

• Do not use organizer sheets that are stuck together. The glue that is used might cause

damage to the printer.

• Do not load different types of paper at the same time in the paper tray because it may

cause paper jams or misfeeds.

2-15

CHAPTER 2 INSTALLATION AND BASIC OPERATION

CAUTION:

!

Do not touch transparencies that have just been printed because they are very HOT.

2-16

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.

Fig. 2-22

Fig. 2-23

(3) Place paper in the multi-purpose tray so it

touches the back of the tray and remains below
the limit mark.

Fig. 2-24

NOTE:

Note the following when placing paper in the multi-purpose tray:

• If paper to be printed on weighs more than 135 glm

2

(36 lbs), use the face up output tray.

• Insert the leading edge of the paper first and push it gently into the tray.

• The printed side must be face up.

(4) Press and slide the paper width adjuster to fit the

paper.

(5) Change the settings in the printer driver Property tab.

2-17

Fig. 2-25

CHAPTER 2 INSTALLATION AND BASIC OPERATION

4.3 Printing to the Face up Output Tray (Face up Printing)

When the face up output tray is open, the printer has a straight paper path from the paper
cassette or multi-purpose tray to the rear of the printer. Use this output method when printing
on special media that is thick or should not be bent, such as heavy paper, labels,
transparencies, card stock or envelopes.

When printing to the face up output tray, follow the steps below;

(1) Open the face up output tray.

(2) Unfold the face up output tray extension.

(3) Place the paper into the paper cassette or multi-purpose tray.

Fig. 2-26 Fig. 2-27

(4) After the printer ejects all the printed pages, remove 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 duplex printing:

• If the paper is thin, it may wrinkle.

• If paper is curled, straighten it, and then place it in the paper cassette.

• Use A4, Letter or Legal size plain paper (60 to 105 g/m

paper.

• If the paper is not feeding correctly, it may be curled. Remove the paper and straighten it.

When printing on both sides of the paper, follow the steps below;

(1) Load paper into the paper cassette or multi-purpose tray

(2) When using A4 or Letter size paper, set the

paper adjustment lever for duplex printing to
match the paper size.

2

or 16 to 28 lb.). Do not use bond

NOTE:

Fig. 2-28

2-18

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.

2-19

CHAPTER 2 INSTALLATION AND BASIC OPERATION

(3) Open the Property tab in the printer driver. Select the duplex printing mode in the Paper

tab, and then click the OK button. The printer will print on both sides of the paper
automatically.

4.5 Manual Feed

If paper is placed in the multi-purpose tray when the setting MANUAL FEED = ON has been
set in PAPER mode 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

selected in that software. The software command setting overrides the control panels
setting. It will not be necessary to set MANUAL FEED in PAPER mode.

• If pre-printed paper is used in the multi-purpose tray, the paper should be inserted top

edge first with the pre-printed side face up.

4.6 Printing side of duplex printing

Since the standard delivery tray is a face down tray, when duplex printing is carried out, an
even-numbered paper is printed first, then the odd numbered page, so that the page order in
the output tray is correct.

If single side printing is done in normal mode, paper is drawn from an input tray, and it naturally
prints and discharges a face down page.

If single side printing of 1-page of data is done in duplex mode, printing is done by feeding
paper from an input tray, passing it through the duplex unit and then printing the first side.

2-20

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 control panel switches,
the display will change.

LCD display

Data LED

5.1 Data LED Indications

The Data LED indicates with orange lamp the current status of the printer.

Data

Reprint

Job cancel

Back

Set

Go

Fig. 2-29

LED Printer status

On Data remains in the printer buffer.

Blinking Receiving or processing data.

Off No remaining data.

2-21

CHAPTER 2 INSTALLATION AND BASIC OPERATION

5.2 Panel Switches Functions

You can control the basic printer operations and change various printer settings with 7 control
panel switches (Go, Job Cancel, Reprint, +, -, Set, Back).

Key Function

Go Exit from the control panel menu.

Reprint settings and Error messages.

Pause / Continue printing.

Job Cancel Stop and cancel the printer operation in progress.

Reprint Select the reprint menu. (1-999)

+

-

Set Select the control panel menu.

Back Go back one level in the menu structure.

5.2.1 Go switch

The panel indications can be changed from the current status (MENU, ERROR and REPRINT
settings) by pressing the Go switch once. For ERROR indications, the panel changes only
when the error is cleared.

You can PAUSE printing with the Go switch. Pressing the Go switch again restarts the print
job and clears the PAUSE. During PAUSE, the printer is in the off-line state.

NOTE:

If you do not wish to print the remaining data when the printer is in PAUSE, you can cancel the
job by pressing Job Cancel switch. Press the Go switch to clear the PAUSE and return the
printer to the Ready state.

5.2.2 Job Cancel switch

Move forward and backward through menus.

Move forward and backward through selectable options.

Set the selected menus and settings.

You can cancel the processing or printing of data with the Job Cancel switch. When the
printer is still receiving data or the printer is in an error state, the display shows 

DATA!!!

The display shows 
the printer returns to the 

 and you cannot cancel the job.

JOB CANCELLIG

READY

 until canceling is completed. After canceling the job,

 state.

2-22

NO

5.2.3 Reprint switch

If you want to reprint a document that has just been printed, you can reprint it by pressing the
Reprint switch. Also, if you have created a document that you wish to share with colleagues,
simply spool the document to a non-secure area of the printer.
This document can then be re-printed by anyone who is on the network or at the printer control
panel.

HL-1850/1870N SERVICE MANUAL

You can use the reprint function when the printer is

When you want to print SECURE data, we recommend RAM enhancement to enable the
reprint using RAM function.

When you use RAM to reprint:

i) Press the Set switch on the control panel to exit from the READY status and select

RAMDISK SIZE in the SETUP mode.

ii) The default RAM size is 0MB. Press the + switch to increase the reprint RAM size in 1MB

steps.

NOTE:

• When you increase the RAM size to use for secure printing, the work area of the printer is

decreased and the printer performance will reduce. Ensure that you reset the
RAMDISKSIZE to 0MB when you have finished using secure printing.

• When you store the data in RAM, the data is deleted when the printer power is turned off.

• We also recommend adding additional RAM when you want to secure print a large

amount of data.

(1) Reprinting the last job

You can reprint the last print job without sending it from the computer again.

READY

or in the settings menu.

NOTE:

• When REPRINT is set to Off using the control panel and you press the Reprint switch,

the LCD briefly shows 

• If you want to 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 + switch makes the number of reprint copies decrease or increase. You

can select between

NO DATA STORED

COPIES= 1

and

.

COPIES=999

.

2-23

CHAPTER 2 INSTALLATION AND BASIC OPERATION

y

Reprint the last job 3 times

1. Set the REPRINT menu ON with SETUP mode using the control panel

2. Press the Reprint switch.

COPIES= 1

Press + until the next screen is displayed as shown below.

If you wait too long to continue the
switch panel operation, the display exits
the REPRINT menu automaticall

.

COPIES= 3

Press the Set or Reprint switch.

REPRINTING

NOTE:

If you want to reprint the data and have pressed the Go switch, the display shows 

SET TO PRINT

reprint job.

(2) Printing SECURE data

Secure documents are password protected and only those people that know the password
will be able to print the document. The printer will not print the document when you 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.

. Press Set to start the reprint job or press the Go switch to cancel the

PRESS

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 data in the job information that cannot be displayed on the LCD, the display

shows ?.

• You can also reprint the job using the supplied printer driver.

2-24

Operations for printing secure data

HL-1850/1870N SERVICE MANUAL

Press the Reprint switch.

LAST JOB

Press + or -

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 select the job.
Press the Set switch to set the job.

PASSWORD XXXX

If there is no data.

NO DATA STORED

Input your password.
Press the Set switch to set the password.

COPIES= 1

Press the Set or Reprint switch.
If you press the Go switch, the display shows 

The printer will exit this menu
after a timeout period.

PRESS SET TO PRINT

PRINTING

When there is no reprint data in memory

If the printer does not have any data in buffer memory and you press the Reprint switch, the
LCD briefly shows 

When you want to delete the job

Select the 
the user name and the job to delete (you need to input the password to delete secure data).

DELETE STORAGE

NO DATA STORED

 menu under the SETUP menu of the control panel. Select

.

.

When you cancel the reprinting job

Pressing the Job Cancel switch allows you to cancel the reprint job. The Job Cancel switch
also allows you to cancel a paused reprint job.

2-25

CHAPTER 2 INSTALLATION AND BASIC OPERATION

5.2.4 + & - switch

If you press the + or  switch when the printer is in the on-line state (READY), it turns off-line
and the LCD displays the menu.

(1) To display menus in the current mode

If you press the + or  switch when the printer is in the on-line state (READY), it goes
off-line and the LCD displays the current mode.

You can enter other menus in the current mode by pressing the + or  switch. Pressing
the + or  switch allows you to scroll forward or backward through the menus and settings
on the display. Press or hold the switch until the display shows the desired item.

(8) To set numbers

There are two ways to input numbers. You can use the + or  switch to scroll up or down
to set them one at a time, or you can enter them. If you hold down the + or  switch, the
display scrolls up or down faster.

5.2.5 Set switch

If you press the Set switch when the printer is in the on-line state (READY), it goes off-line and
the LCD displays the current mode.

Pressing the Set switch allows you to set the selected menu or the default number. After
changing the menu or the number, an asterisk appears briefly on the right and the mode
returns to the previous menu.

5.2.6 Back switch

If you press the Back switch when the printer is in the on-line state (READY), it goes off-line
and the LCD goes to the menu display.

Pressing the Back switch allows you to return to the previous level from the current menu level.
The Back switch also allows you to select the next digit while inputting numbers. When the
leftmost digit is selected, the Back switch allows you to go up one level in the menu. When a
menu or number without an asterisk (Set switch not pressed) is selected, the Back switch
allows you to return to the previous menu level with the original setting unchanged.

NOTE:

When you press the Set switch to select a setting, an asterisk appears briefly at the end of the
display. Since the asterisk indicates the selection, you can easily find the current setting as
you scroll through the display.

5.3 LCD Display

The display shows the current printer status. When you use the control panel switches, the
display will change.

When you 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

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 Status

Off The printer is in sleep status.

HL-1850/1870N SERVICE MANUAL

PR2001022

Green (General)

Warming up

Ready to print

Printing

Red (Error) A problem has occurred with the printer.

Orange (Setting)

Setting menu

Setting reprint times

Pause

2-27

CHAPTER 2 INSTALLATION AND BASIC OPERATION

5.3.2 Printer status messages

The following table shows the printer status messages that are displayed during normal
operation:

Printer Status Message Meaning

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

Ready to print.

Busy processing data.

In sleep status (power save mode).

Printing.

Performing self-diagnostics.

The printer has suspended feeding forms.
Pressing the Go switch resumes form feed.

The printer is setting up.

The printer is warming up.

This printer has XX MB memory.

Canceling the job.

Printing with reduced resolution.

Press the Set switch to start printing.

The printer setting returns to the factory setting.

2-28

5.4 How to Use the Control Panel

The followings are the basic steps when operating the switches; Menu, +, , Set, and Back.

• If no control panel operations are performed for 30 seconds, the LCD automatically

returns to READY.

• When pressing the Set switch to select a setting, an asterisk briefly appears at the end of

display. After that, the display returns to the previous menu level.

• After changing the status or number, pressing the Back switch before pressing the Set

switch will cause the display to return to the previous menu with the original setting
unchanged.

• Numbers can be input by scrolling through the available range (000 to 999) or by setting

digits one at a time. When setting digits one at a time, the blinking digit is the changeable
digit.

• An example for operation: When turning the MP FIRST setting on

Choose this setting to load paper from the multi-purpose tray first.

READY

HL-1850/1870N SERVICE MANUAL

INFORMATION

PAPER

SOURCE

MP FIRST

=OFF 

Press the + switch.
Press the + or  switch to scroll forward or backward
through the Menu selections.

Press the Set switch.
Press the Set switch to enter the next level of the selected menu.

Press the Set switch to proceed to the next menu level.

Press the + switch.

Press the Set switch.

Press the + switch.

=ON

=ON 

Press the Set switch.
An asterisk  briefly appears at the end of the display.
The default setting is indicated by an 

 ”.

2-29

CHAPTER 2 INSTALLATION AND BASIC OPERATION

5.5 Control Panel Setting Menu

There are 8 modes. For more information about the selections available for each mode, refer
to the pages listed below.

INFORMATION

For more information, see subsection 5.5.1 INFORMATION in this Chapter.

PAPER

For more information, see subsection 5.5.2 PAPER in this Chapter.

:

QUALITY

For more information, see subsection 5.5.3 QUALITY in this Chapter.

SETUP

For more information, see subsection 5.5.4 SET 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, see subsection 5.5.8 RESET MENU in this Chapter.

:

:

:

:

:

:

2-30

5.5.1 Information

Setting Menu Description

HL-1850/1870N SERVICE MANUAL

PRINT SETTINGS
PRINT TEST
PRINT DEMO
PRINT FILE LIST
PRINT FONTS

VERSION

MAINTENANCE

Print the configuration page.

Print the test page.

Print the demonstration.

Print the file list.

Print the font list and samples.

Sub-setting Menu Description

SER.NO=#########
ROM VER=####

ROM DATE ##/##/##
NET VER=####
NET DATE ##/##/##
RAM SIZE=###MB

Printer serial number

ROM firmware version (only
network users)

ROM date (only netword users)

Network firmware version

Network date

The size of memory in this printer.

PAGE COUNTER =######
REMAIN DRUM =######
REMAIN PF KIT1 =######
REMAIN PF KIT2 =######

5.5.2 Paper

Setting Menu Description

SOURCE
TRAY PRIORITY

MP FIRST

MP SIZE
MANUAL FEED

TRAY1 SIZE
TRAY2 SIZE

DUPLEX

REMAIN FUSER =######
REMAIN LASER =######

=AUTO / MP TRAY / TRAY1 / TRAY2 *

=MP>T1>T2 / T1>T2>MP

=OFF / ON
Feed paper from the MP tray first.

=ANY / LETTER / LEGAL / A4 / 

=OFF / ON

=ANY / LETTER / LEGAL / A4 / 

=ANY / LETTER / LEGAL / A4 / 

=OFF / ON (LONG BIND) / ON (SHORT BIND)

* MP TRAY = Multi-purpose tray, TRAY1 = Upper paper tray, TRAY2 = Optional lower tray

2-31

CHAPTER 2 INSTALLATION AND BASIC OPERATION

5.5.3 Quality

Setting Menu Description

PR2001022

RESOLUTION

HRC

TONER SAVE
DENSITY

5.5.4 Setup

Setting Menu Description

LANGUAGE
LCD DENSITY
POWER SAVE TIME
AUTO CONTINUE
LOCK PANEL

=300 / 600 / HQ1200
You can choose a print resolution of 300, 600 or HQ1200.

=OFF / LIGHT / MEDIUM/DARK
HRC: High Resolution Control offers improved print quality of
characters and graphics that conventional laser printers cannot
attain with a resolution of 300 or 600 dpi.

=OFF / ON

=-6:0:6
Increase or decrease the print density.

=ENGLISH / FRANÇAIS / 

=0 / 1 / 2

=1 to 99 MIN.

=OFF / ON

=OFF / ON
Turn on / off lock panel function.

REPRINT
PAGE PROTECTION
EMULATION
KEEP PCL
RAMDISK SIZE
DELETE STORAGE

PASS NO.=###

=ON / OFF

PROTECT = AUTO AUTO, OFF, LETTER, A4 OR LEGAL

=AUTO (EPSON) / AUTO (IBM) / HP LASERJET / 

=OFF / ON

=0 / 1 / 2  MB RESTART?

Delete the internal flash memory print data.

Sub-setting Menu Description

SECURE FILE

DATA ID
MACRO ID
FONT ID
FORMAT

Select the user name, job name and
password.

=####

=####

=####

OK?

2-32

5.5.5 Print menu

Setting Menu Description

HL-1850/1870N SERVICE MANUAL

PR2001022

MEDIA TYPE

PAPER

COPIES

ORIENTATION

PRINT POSITION

AUTO FF=OFF

=PLAIN PAPER / TRANSPARENCIES / THIN PAPER / THICK
PAPER / THICKER PAPER / BOND PAPER / ENVELOPES /

ENV.THICK / ENV.THIN

Set cup sheet paper size to Letter, Legal, A4, A5, A6, B5, B6,
Executive, COM10, Monarch, C5 and DL

=1 to 999

Shows the number of printed pages.

=PORTRAIT / LANDSCAPE
This printer can print pages in portrait or landscape orientation.

This printer can be adjusted to correct the page format.

Sub-setting Menu Description

X OFFSET=0

Y OFFSET=0

=OFF / 1:5:99 (sec)
Allows you to print the remaining data without pressing the Go
switch.

Move the print start position (at the
upper left corner of pages) horizontally
up to 500 (left) to +500 (right) dots in
300 dpi units.

Move the print start position (at the
upper left corner of pages) vertically up
to 500 (up) to +500 (down) dots in 300
dpi units.

FF SURPRESS

HP LASERJET

=OFF / ON
Turn on / off the form feed suppress function.

FONT NO.
FONT

PITCH/POINT
SYMBOL/

CHARACTER SET
TABLE PRINT
AUTO LF=OFF

AUTO CR=OFF

AUTO WRAP=OFF

=I0000:?????

=???.??

PC-8 / 
Set the symbol set or the character set.

Print code table

=OFF / ON
ON: CRÆCR+LF,
OFF: CRÆCR

=OFF / ON
ON: LFÆLF+CR, FF+CR,
OR VTÆVT+CR
OFF: OFÆOF, FFÆFF, OR VTÆVT

=OFF / ON
Line feed and carriage return occur
when the printer reaches the right
margin.

2-33

CHAPTER 2 INSTALLATION AND BASIC OPERATION

AUTO SKIP=ON

Setting Menu Description

HP LASERJET

LEFT MARGIN

RIGHT MARGIN

TOP MARGIN

BOTTOM MARGIN

=OFF / ON
Line feed and carriage return occur
when the printer position reaches the
bottom 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 cpi.

=####
Set the top margin at a distance from the
top edge of the paper:
0, 0.33, 0.5, 1.0, 1.5 or 2.0
Factory setting=0.5

=####
Set the bottom margin at a distance from
the bottom edge of the paper:
0, 0.33, 0.5, 1.0, 1.5 or 2.0
Factory setting: 0.33 (None-HP), 0.5
(HP)

EPSON FX-850

LINES

FONT NO.
FONT PITCH/

POINT
SYMBOL/

CHARACTER SET
TABLE PRINT
AUTO LF=OFF

AUTO MASK
LEFT MARGIN

RIGHT MARAGIN

TOP MARGIN

=####
Set the number of lines per page from 5
to 128 lines.

=I0000:?????

=???.??

PC-8 / 
Set the symbol set or the character set.

Print code table.

=OFF / ON
ON: CRÆCR+LF
OFF: CRÆCR

=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 edge of the paper:
0, 0.33, 0.5, 1.0, 1.5 or 2.0
Factory setting=0.33

2-34

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

CHAPTER 2 INSTALLATION AND BASIC OPERATION

Setting Menu Description

IBM PROPRINTER

FONT NO.
FONT PITCH/

POINT
SYMBOL/

CHARACTER SET
TABLE PRINT
AUTO LF=OFF

AUTO CR=OFF
LEFT MARGIN

RIGHT MARAGIN

TOP MARGIN

=I0000:?????

=???.??

PC-8 / 
Set the symbol set or the character set.

Print code table.

=OFF / ON
ON: CRÆCR+LF
OFF: CRÆCR

=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 edge of the paper:
0, 0.33, 0.5, 1.0, 1.5 or 2.0
Factory setting=0.33

BR-SCRIPT

BOTTOM MARGIN

LINES

ERROR PRINT
APT

=####
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.

=OFF / ON

=OFF / ON
APT: Advanced Photoscale Technology
offers photographic fine grayscale on
graphics. APT setting is available only at
600 dpi.

2-36

5.5.6 Network

Setting Menu Description

HL-1850/1870N SERVICE MANUAL

PR2001022

TCP/IP

NETWARE

APPLETALK

NETBEUI
DLC/LLC
BANYAN
LAT
NETBIOS/IP

Sub-setting Menu Description

TCP/IP ENABLE
IP ADDRESS=
SUBNET MASK=
GATEWAY=
IP BOOT TRIES
IP METHOD

NETWARE ENABLE
NET FRAME

=ON / OFF

=ON / OFF

=ON / OFF

=ON / OFF

=ON / OFF

=ON / OFF

=ON / OFF

###, ###, ###, ###

###, ###, ###, ###

###, ###, ###, ###

=#

=AUTO / STATIC / RARP / BOOTP /
DHCP

=ON / OFF

=AUTO / 8023 / ENET / 8022 / SNAP

ENET

5.5.7 Interface

Setting Menu Description

AUTO IF TIME

INPUT BUFFER

PARALLEL

=ATUO / 100B-FD / 100B-HD / 10B-FD / 10B-HD

= 1:5:99 (SEC)
You must set the timeout period for the auto interface
selsection.

= Level 1:5:15
Increase or decrease the
input buffer capacity.

When using the parallel interface

Sub-setting Menu Description

HIGH SPEED

BI-DIR=ON/OFF

RESTART PRINTER?

=ON / OFF
Turns the high speed parallel
communications ON / OFF.

=ON / OFF
Turns the bi-directional parallel
communications ON / OFF.

2-37

CHAPTER 2 INSTALLATION AND BASIC OPERATION

5.5.8 Reset menu

Setting Menu Description

RESET PRINTER

FACTORY RESET

5.5.9 Set IP address

INFORMATION

NETWORK

TCP/IP

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 printer settings  including
command settings  to the factory settings. See subsection

5.5.11 List of factory settings in this Chapter.

Press the + or  switch to select the NETWORK menu.

Press the Set switch.

Press the Set switch.

TCP/IP ENABLE

Press the + switch.

IP ADDRESS=

Press the Set switch.

192.0.0.192 

The last number in the digit which you can change is blinking.
Press the + or  switch to increase or decrease the number.
Press the Set switch to go to next digit.

123.0.0.192

Repeat this until you have set your IP address.

123.45.67.89

Press the Set switch to complete the IP address.

123.45.67.89 

An asterisk appears at the end of the display.

2-38

5.5.10 About emulation modes

This printer has the following emulation modes.

HP LserJet 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 this type of laser
printer. Using this mode will allow your printer to operate at its optimum performance with
those applications.

BR-Script 3 Mode

BR-Script is an original page description language and a PostScript language emulation
interpreter. This printer supports level 3. The BR-Script interpreter of this printer enables full
and satisfactory control of text and graphics on pages.

See the following commercial manuals for more technical information about PostScript
commands.

• Adobe Systems Incorporated. PostScript Language Reference Manual, 2nd Edition.

Menlo Park: Addison-Wesley Publishing Company, Inc., 1990.

• Adobe Systems Incorporated. PostScript Language Program Design. Menlo Park:

Addison-Wesley Publishing Company, Inc., 1988.

• Adobe Systems Incorporated. PostScript Language Reference Manual. Menlo Park:

Addison-Wesley Publishing Company, Inc., 1985.

• Adobe Systems Incorporated. PostScript Language Tutorial and Cookbook. Menlo Park:

Addison-Wesley Publishing Company, Inc., 1985.

• Adobe Systems Incorporated. PostScript Language Reference Manual, third Edition.

Addison-Wesley Longman, Inc., 1999.

HL-1850/1870N SERVICE MANUAL

EPSON FX-850 and IBM Proprinter XL Mode

The EPSON FX-850 and IBM Proprinter XL modes are the emulation modes that this printer
emulates to meet the industry-standard for dot matrix printers of their respective manufactures.
Some applications support these dot matrix printer emulations. Use these emulation modes
for optimum performance when printing from those types of applications.

5.5.11 List of factory settings

The following table shows the initial factory default settings.

NOTE:

• The settings are subject to the emulation mode. Effective modes are indicated in

parentheses in the following table.

• The following settings cannot be restored to the factory settings with the RESET menu in

the FACTORY SETTINGS mode: INTERFACE MODE, HRC SETTING, PAGE
PROTECTION, SCALABLE FONT, LOCK PANEL, PAGE COUNTER and local language
for display messages.

• The COPY setting is always restored to the factory setting when the printer is turned off

and on again.

• It is not possible to reset NETWORK setting on the Control panel. If you wish to reset the

print server back to its default factory settings (resetting all information such as the

2-39

CHAPTER 2 INSTALLATION AND 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

Mode Menu Factory Setting

HL-1850/1870N SERVICE MANUAL

PAPER

QUALITY

SETUP

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

=AUTO

=MP>T1>T2

=OFF

=A4 / LTR

=OFF

=ANY

=ANY

=OFF

=600

=MEDIUM

=OFF

=0

=ENGLISH

=0

=5 MIN

=OFF

PRINT MENU

LOCK PANEL
REPRINT
EMULATION
KEEP PCL
MEDIA TYPE
PAPER
COPIES
ORIENTATION
PRINT POSITION

AUTO FF TIME
FF SUPPRESS

=OFF

=ON

=AUTO (EPSON)

=OFF

=PLAIN PAPER

=A4 / LETTER

=1

=PORTRAIT

X OFFSET=0
Y OFFSET=0

=5

=OFF

2-41

CHAPTER 2 INSTALLATION AND BASIC OPERATION

Mode Menu Factory Setting

PRINT MENU

HP LASER JET

EPSON FX-850

FONT NO.=59

FONT PITCH / POINT=10.00 / 12.00

SYMBOL / CHARACTER SET=PC8

AUTO LF=OFF

AUTO CR=OFF

AUTO WRAP=OFF

AUTO SKI=ON

LEFT MARGIN=####

RIGHT MARGIN=####

TOP MARGIN=####

BOTTOM MARGIN=####

LINES=####

FONT NO.=59

FONT PITCH / POINT=10.00 / 12.00

SYMBOL / CHARACTER SET
=US ASCII

IBM PROPRINTER

AUTO LF=OFF

AUTO MASK=OFF

LEFT MARGIN=####

RIGHT MARGIN=####

TOP MARGIN=####

BOTTOM MARGIN=####

LINES=####

FONT NO.=59

FONT PITCH / POINT=10.00 / 12.00

SYMBOL / CHARACTER SET
=PCB

AUTO LF=OFF

AUTO CR=OFF

LEFT MARGIN=####

RIGHT MARGIN=####

TOP MARGIN=####

BR-SCRIPT

BOTTOM MARGIN=####

LINES=####

ERROR PRINT=OFF

APT=OFF

2-42

Mode Menu Factory Setting

HL-1850/1870N SERVICE MANUAL

NETWORK

TCP/IP

NETWARE

APPLETALK
NETBEUI
DLC/LLC
BANYAN
LAT
NETBIOS/IP
ENET

TCP/IP ENABLE=ON

IP METHOD=AUTO

IP ADDRESS=192.0.0.192

SUBNET MASK=0.0.0.0

GATEWAY=0.0.0.0

IP BOOT TRIES=3

IP METHOD=AUTO

NETWARE ENABLE=ON

NEE FRAME=AUTO

=ON

=ON

=ON

=ON

=ON

=ON

=AUTO

2-43

CHAPTER 2 INSTALLATION AND BASIC OPERATION

5.6 Other Control Features

The printer has the following useful features;

5.6.1 Sleep mode

When the printer does not receive data for a certain period of time (timeout), it enters sleep
mode. The default timeout is 5 minutes and it is automatically adjusted to the most suitable
time-out setting depending on the frequency of your printer use (Intelligent Sleep Mode).

While the printer is in sleep mode, the data LED and the LCD back light are off and it is as if
they were turned off, but the printer can still receive data from the computer. Receiving a print
file or document automatically wakes up the printer to start printing. Pressing any switch on
the control panel also wakes up the printer.

NOTE:

• When the printer goes into sleep mode, the fan will not stop until the printer engine has

cooled down. The fan running time varies depending on the sleep mode timeout 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 be running for 5 minutes after the printer goes into

sleep mode.)

• Sleep mode allows the print engine to cool, so the temperature of the room and how long

the printer has been in sleep mode affects the warm-up time. This warm-up time can take
up to 45 seconds. The LCD back light turns green with the WARMING UP message on
the display to indicate that the printer is warming up.

5.6.2 Inspection mode

The printer incorporates various inspection modes. The printer enters into each inspection
mode by panel switch operation.

For details on inspection mode, see section 9. INSPECTION MODE in CHAPTER 6.

2-44

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 are included. For more
information about set up, see section 3. INSTALL THE PRINTER in this Chapter.

6.1 Installing the Network Board

(1) Turn off the printer power, and then unplug

the power cord. Disconnect the interface
cable (printer cable) from the printer.

(2) Open the interface cover.

HL-1850/1870N SERVICE MANUAL

Fig. 2-30

(3) Unscrew the two screws that secure the PCB access plate. Remove the plate.



Fig. 2-31

(4) Remove the two screws securing the network

board cover plate and remove the plate.

(5) Unpack the network board.

2-45

Fig. 2-32

CHAPTER 2 INSTALLATION AND BASIC OPERATION

(6) Insert the network board connector into the PCB connector, and then secure it with the

two screws removed in (4).

(7) Re-install the PCB access plate, and then secure it 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.



Fig. 2-33

Print configuration page

Press the network test button for less than 5 seconds to print a configuration page.

Network port

Fig. 2-34

2-46

6.2 Functions

6.2.1 LED functions

HL-1850/1870N SERVICE MANUAL

A-LED

(Green)

F-LED

(Orange)

L-LED

(Green)

L-LED (Green): Link activity

This LED is on if there is a valid connection to the network (either 10BaseT or 100BaseTX). It
is off if no network is detected.

F-LED (Orange): Fast Ethernet

This LED will be on if the print server is connected to a 100BaseTX Fast Ethernet network. It
is off if the print server is connected to a 10BaseT network.

A-LED (Green): Transmission activity

This LED will blink 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
such as the password and IP address information), hold down the Network Test button for
more than 5 seconds.

Fig. 2-35

2-47

CHAPTER 2 INSTALLATION AND BASIC OPERATION

2-48

CHAPTER 3 THEORY OF OPERATION

1. ELECTRONICS

1.1 General Block Diagram

HL-1850

HL-1870N

Fig. 3-1 shows a general block diagram of the HL-1850 and the HL-1870N printers.

Network board

(Standard for HL-1670N

Option for HL-1650)

HL-1850/1870N SERVICE MANUAL

supply block

Low-voltage power

supply block

High-voltage power

Optional RAM (DIMM)
(max. 128Mbytes)

Control system

RAM 8MB

Video control block

Laser unit

Drum unit

Expansion
memory I/O

Engine control block

Transfer block

Ethernet

10/100 Base TX

PCI bus

Interface block

(Parallel / USB)

Operation block

(Control panel)

Drive block
(DC motor)

External deviceExternal device

Paper tray unit

Paper cassette

MP tray

Charging

block

Developing

Toner cartridge

Image generation system

Drum

block

cleaner block

Fig. 3-1

3-1

Paper dust

Fixing unit

Duplex

printing unit

Paper eject block

Paper feed system

CHAPTER 3 THEORY OF OPERATION

1.2 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.

Reset Circuit

Program + Font ROM

10 Mbytes

CPU Core

(MB86834)

BUS

A S I C

Oscillator (48MHz)

INT

Address Decoder

DRAM Control

Network Program

(2.0 Mbytes)

RAM

(HL-1650: 8.0 Mbytes)

(HL-1670N: 16 Mbytes)

Option RAM (DIMM)

(max. 128Mbytes)

EEPROM (8192 x 8 bits)

Timer

FIFO

CDCC Parallel I/O

USB I/O

Soft Support

EEPROM I/O

Engine Control I/O

To PC

To PC

To PC

or Hub

Network Board

(Option for HL-1650)

Oscillator 33.3MHz

To Engine PCB

PCI Bus Control

Fig. 3-2

3-2

1.3 Main PCB

For the entire circuit diagram of the 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 is
generated by multiplying the source clock by two.

The functions of the interface block communication with external devices are described below;

(1) IEEE1284

Stores the data received from the PC into DRAM as controlled by the DMA controller. It is

applicable to both normal receiving and bi-directional communication (nibble mode, byte
mode, ECP mode).

HL-1850/1870N SERVICE MANUAL

Fig. 3-3

3-3

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.

Fig. 3-4

(3) Engine GA transfer circuit

Communicates with the engine GA by a full-duplex synchronous serial method. The

communication speed is 520Kbps.

3-4

Fig. 3-5

HL-1850/1870N SERVICE MANUAL

3-5

CHAPTER 3 THEORY OF OPERATION

1.3.2 ROM

HL-1850

HL-1870N

Two 64 Mbits ROMs (x 16 bit) are fitted.

Fig. 3-6

3-6

1.3.3 Flash ROM

HL-1850

HL-1870N

Two 8 Mbits flash ROMs (x 16 bit) are fitted.

HL-1850/1870N SERVICE MANUAL

Fig. 3-7

3-7

CHAPTER 3 THEORY OF OPERATION

1.3.4 SDRAM

HL-1850

A 64M-bit SDRAM (x 32 bits) is used as the RAM.

Fig. 3-8

3-8

HL-1870N

Two 64M-bit SDRAMs (x 16 bits) are used as the RAM.

HL-1850/1870N SERVICE MANUAL

Fig. 3-9

3-9

CHAPTER 3 THEORY OF OPERATION

1.3.5 Optional RAM

HL-1850

HL-1870N

A 32bit (100 pin) DIMM can be fitted as optional RAM. The main PCB has one slot and the
capacity of DIMM can be from 16 Mbyte to 128 Mbytes.

Fig. 3-10

3-10

1.3.6 PCI bus

HL-1850

HL-1870N

The interface of the PCI bus is PCI specification revision 2.2 compliant.

HL-1850/1870N SERVICE MANUAL

Fig. 3-11

3-11

CHAPTER 3 THEORY OF OPERATION

1.3.7 EEPROM

HL-1850

HL-1870N

The EEPROM is M24C64 type of two-wire method with a 8192 x 8 bits configuration.

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.)

Fig. 3-12

Fig. 3-13

3-12

1.3.9 Engine I/O

HL-1850

HL-1870N

Fig. 3-19 shows the engine interface circuit. The interface with the engine PCB is by full­duplex synchronous serial method.

HL-1850/1870N SERVICE MANUAL

1.3.10 Panel I/O

HL-1850

HL-1870N

Fig. 3-15 shows the panel interface circuit. The interface with the panel PCB is by full-duplex
synchronous serial method.

Fig. 3-14

3-13

CHAPTER 3 THEORY OF OPERATION

Fig. 3-15

3-14

1.4 Engine PCB

The gate array which transforms the serial signal from the main PCB into the parallel signal is
mounted on the engine PCB.

The engine PCB controls the following parts by using the transferred signal data;

Main motor

•

Fan motor

•

Thermistor

•

Polygon motor

•

Solenoid

•

HIgh-voltage power supply

•

Toner sensor

•

Cover sensor

•

Front registration sensor

•

Rear registration sensor

•

Upper cassette sensor

•

HL-1850/1870N SERVICE MANUAL

Lower cassette sensor

•

Upper paper exit sensor

•

Lower paper exit sensor

•

Duplex tray sensor

•

Duplex lever sensor

•

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 connected to the ASIC mounted on the main PCB through the PCI bus.

The Ethernet controller, AM79C973AKC is mounted on the BR-net PCB. The controller
incorporates the 10/100 Mbps physical interface which conforms to IEEE 802.3 and is
connected with the external Ethernet through the RJ-45 connector.

For the circuit diagram of the BR-net PCB, see APPENDIX 10. NETWORK BOARD PCB

CIRCUIT DIAGRAM, HL-1850/1870N in this manual.

3-15

CHAPTER 3 THEORY OF OPERATION

1.6 Power Supply

1.6.1 Low-voltage power supply

The power supply uses a switching regulation system to generate the regulated DC power
(+3.3V, +7V [non regulated] and +24V), which are converted from the AC line.

The regulated output and the production code of each power supply are listed below;

Regulated Output Production Code
+3.3V / 1.0A

+7V / 0.7A
+24V / 3.0A

For the circuit diagram of the low-voltage power supply PCB, see APPENDIX 11. or 12. LOW-

VOLTAGE POWER SUPPLY PCB CIRCUIT DIAGRAM in this manual.

Fuse

100V: MPW1860
200V: MPW1760

(Heater)

Thermal

Fuse

Lightning

Surge

Absorber

Line

Filter

Fuse

Rectifier

24V

Regulation

Circuit

Heater
Circuit

Lamp

Feedback

Oscillator

(Engin Circuit / Main Circuit)

24V

3.3V

Regulation

Circuit

8V

3.3V

Fig. 3-16

3-16

1.6.2 High-voltage power supply

The high-voltage power supply generates and outputs the voltages and currents for the
charging, development and transfer functions.

For the circuit diagram of the high-voltage power supply PCB, see APPENDIX 13. HIGH-

VOLTAGE POWER SUPPLY PCB CIRCUIT DIAGRAM in this manual.

HL-1850/1870N SERVICE MANUAL

24VI

R1

Current

Regulator

B1

Voltage

Regulator

VR21

Current

Regulator

B61 Q63

Voltage

Regulator

Supply
Roller

Development

Roller

Transfer Roller

Cleaning Brush

Photosensitive

Drum

Corona

Unit

GND

B81 Q82

VR81

Voltage

Regulator

Z51 VR51

Voltage

Regulator

VR31

Fig. 3-17

3-17

Toner sensor

DRUM UNIT

Supply roller

Blade

Scanner motor

LASER UNIT

Corona wire

Paper feed pinch roller

First feed pinch roller

Paper feed roller

MP pick-up roller

Paper pick-up roller

First feed roller

Cassette pressure roller

Separation pad

Front registration

sensor lever

Rear registration

sensor lever

Pressure plate

Fig. 3-18

Development roller

3-18

Heat roller

Second eject roller

2. MECHANICS

2.1 Overview of Printing Mechanism

Transfer roller

Photosensitive

drum

Cleaner

Paper

Rear cover

Paper guide

Duplex outer guide

FIXING UNIT

First eject roller

Pressure roller

DUPLEX TRAY

PAPER CASSETTE

CHAPTER 3 THEORY OF OPERATION

Network

Board

(HL-1670N)

HL-1850/1870N SERVICE MANUAL

Panel PCB

Laser Unit H

Laser

Polygon Motor

Drum Unit

Primary Charger (Corona Wire)

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

Rear

Registration

Sensor

Main Motor

DX Sensor PCB

DX Tray Sensor

DX Paper

Size Sensor

Casette Sensor PCB

Casette Sensor

Paper Empty

Sensor

High-

Voltage

Power

Supply

PCB

FAN

Relay

PCB

SOL

Relay

PCB

Primary Charger (Grid)

Development Roller

Supply Roller

Transfer Roller

Paper Dust Cleaner

60 mm sq Fan Motor A
60 mm sq Fan Motor

80 mm sq Fan Motor

Toner Sensor PCB (Light reception)

Rear Cover Sensor

Panel Back Light PCB

DX Solenoid

MP Solenoid

Casette Solenoid

Registration Solenoid

Toner Sensor PCB (Light emission)

Thermister

Relay PCB

Jam Clear
Cover Sensor

Fig. 3-19

3-19

Thermister (For Heat Roller)

Paper Eject Sensor

CHAPTER 3 THEORY OF OPERATION

2.2 Paper Transfer

2.2.1 Paper supply

The paper pick-up roller picks up one sheet of paper from the paper cassette every time it is
rotated and feeds it to the paper feed roller.

Paper feed pinch roller

Paper feed roller

Front registration

sensor lever

Pressure plate

First feed roller

Paper pick-up roller

Fig. 3-20

First feed pinch roller

Idle roller

Separation pad

The paper is gripped between the paper pick-up roller and the separation pad and separated
into individual sheets.

The pick-up roller is directly connected to the clutch mechanism, whose rotation is stopped by
the stopper arm. When the pick-up solenoid is activated, the clutch mechanism is engaged by
the solenoid action and the paper pick-up roller is driven. The paper drawn out of the tray by
the pick-up roller pushes against the front registration sensor lever and the paper top
position/absence of paper is detected by sensing the motion of the lever.

2.2.2 Paper registration

After the paper top position is detected by the front registration sensor, the paper, separated
into individual sheets by the paper pick-up roller, is fed further for 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

Transfer roller

Rear registration

sensor lever

Paper feed roller

Fig. 3-21

3-20

HL-1850/1870N SERVICE MANUAL

The rear registration sensor in the path from the feed roller to the transfer roller controls the
first print position on the paper.

3-21

CHAPTER 3 THEORY OF OPERATION

2.2.3 Paper eject

After the printing image on the photosensitive drum is transferred onto the paper, the paper is
fed to the fixing unit to fix unfixed toner onto the paper.

Afterwards, the paper is ejected from the fixing unit by the first eject roller in the fixing unit. The
eject sensor lever detects whether the paper is ejected correctly or not.

After the paper exits from the first eject roller, the paper is turned by the rear cover and ejected
face down into the top output tray through the second eject roller. If the rear cover is open, the
paper is ejected face up straight to the printer rear (straight paper path).

Second eject roller

Rear cover

2.2.4 Duplex printing

After the paper exits from the second eject roller with the front of sheet printed, the second
eject roller rotates conversely and feeds the paper to the duplex tray, where the paper skew is
adjusted.

Afterwards, the paper is ejected 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.

Paper cover

Paper outer guide

Paper guide

First eject roller

Eject sensor lever

First eject roller

Fig. 3-22

Paper feed
pinch roller

Pressure roller

Duplex Tray

Transfer roller

Fig. 3-23

3-22

Rear registration
sensor lever

Front registration
sensor lever

Paper feed roller

2.3 Sensors

2.3.1 Cover sensors

Detect opening and closing of the front cover.

Shutter arm C

MP sensor PCB assy

HL-1850/1870N SERVICE MANUAL

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 it when the toner is low. They also detect whether or not the drum unit is
installed. (The toner cartridge is installed in the drum unit.)

Fig. 3-24

Toner sensor
(Light reception)

Toner sensor

(Light emission)

Fig. 3-25

3-23