Brother HL-7050 Series User manual

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Read this manual thoroughly before maintenance work.
Keep this manual in a convenient place for quick and easy reference at all times.
Sep. 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 True Type 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 Laser Jet 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-7050 SERVICE MANUAL
i
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-7050 7050N 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: 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, 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.

TABLE OF CONTENTS
ii
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 Options............................................................................................................................. 1 5
3.4 Electrical and Mechanical ................................................................................................ 1 6
3.5 Network ............................................................................................................................ 1 7
3.6 Paper................................................................................................................................ 1 8
3.6.1 Feedable paper................................................................................................................... 1 8
3.6.2 Print delivery ..................................................................................................................... 1 11
3.7 Printable Area................................................................................................................. 1 13
3.7.1 PCL5e/EPSON/IBM emulation.......................................................................................... 1 13
3.7.2 PCL6/BR Script3 emulation.............................................................................................. 1 16
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 2
2. UNPACKING ...........................................................................................................2 3
3. INSTALL THE PRINTER .........................................................................................2 4
3.1 For All Users .................................................................................................................... 2 4
3.1.1 Remove the protective parts............................................................................................... 2 5
3.1.2 Install the drum unit assembly ............................................................................................ 2 5
3.1.3 Load paper into the paper tray............................................................................................ 2 6
3.1.4 Print a test page.................................................................................................................. 2 8
3.2 For Parallel Interface Cable Users (for Windows® users only)......................................... 2 8
3.3 For USB Interface Cable Users (for Windows® users only) ........................................... 2 11
3.3.1 Install the driver & connect the printer to your PC ............................................................ 2 11
3.3.2 Setting Your Printer as the Default Printer........................................................................ 2 12
3.3.3 Installing the Driver (For Mac OS 8.6 to 9.2 Users).......................................................... 2 12
3.3.4 Setting Your Printer as the Default Printer (For Mac OS 8.6 to 9.2 Users)....................... 2 13
3.3.5 Connecting the Printer to Your Macintosh & Installing the BR Script PPD File ................ 2 13
3.4 For Network Users ......................................................................................................... 2 13
3.4.1 For the administrator......................................................................................................... 2 14
3.4.2 Installing the driver for Windows® users only.................................................................... 2 15

HL-2460 SERVICE MANUAL
iii
3.4.3 Installing the driver for Macintosh® users only.................................................................. 2 17
4. PRINTING METHODS...........................................................................................2 19
4.1 Printing from the Paper Tray (Face down printing) ........................................................ 2 19
4.2 Printing from the MP Tray .............................................................................................. 2 20
4.3 Printing on Envelopes (Face up printing) ....................................................................... 2 22
4.4 Printing on Label, Transparency, etc. ............................................................................ 2 26
4.5 Printing to the Face up Output Tray (Face up printing).................................................. 2 30
4.6 Manual Feed ..................................................................................................................230
5. CONTROL PANEL OPERATION...........................................................................2 31
5.1 Data LED Indications ..................................................................................................... 2 31
5.2 Panel Buttons Functions ................................................................................................ 2 32
5.2.1 Go button .......................................................................................................................... 2 32
5.2.2 Job Cancel button............................................................................................................. 2 32
5.2.3 Reprint button ................................................................................................................... 2 33
5.2.4 + & button ....................................................................................................................... 2 37
5.2.5 Set button ......................................................................................................................... 2 37
5.2.6 Back button....................................................................................................................... 2 37
5.3 LCD Display ................................................................................................................... 2 38
5.3.1 Backlights ......................................................................................................................... 2 38
5.3.2 LCD message ................................................................................................................... 2 38
5.4 How to Use the Control Panel........................................................................................ 2 39
5.5 Control Panel Setting Menu ........................................................................................... 2 41
5.5.1 Information........................................................................................................................ 2 42
5.5.2 Paper ................................................................................................................................ 2 43
5.5.3 Quality............................................................................................................................... 2 43
5.5.4 Setup ................................................................................................................................ 2 44
5.5.5 Print menu......................................................................................................................... 2 46
5.5.6 Network............................................................................................................................. 2 50
5.5.7 Interface............................................................................................................................ 2 51
5.5.8 Reset menu....................................................................................................................... 2 52
5.5.9 Set date and time.............................................................................................................. 2 53
5.5.10 Set IP address .................................................................................................................. 2 54
5.5.11 About emulation modes .................................................................................................... 2 55
5.5.12 List of factory settings ....................................................................................................... 2 56
5.6 Other Control Features .................................................................................................. 2 62
5.6.1 Sleep mode....................................................................................................................... 2 62
5.6.2 Inspection mode ............................................................................................................... 2 62
6. NETWORK BOARD OPERATION.........................................................................2 63
6.1 Installing the Network Board .......................................................................................... 2 63
6.2 Functions........................................................................................................................ 2 65
6.2.1 LED functions ................................................................................................................... 2 65
6.2.2 Factory default setting ...................................................................................................... 2 65
CHAPTER 3 THEORY OF OPERATION ................................................ 3-1
1. ELECTRONICS .......................................................................................................3 1
1.1 General Block Diagram .................................................................................................... 3 1
1.2 Main PCB ......................................................................................................................... 3 2

TABLE OF CONTENTS
iv
1.2.1 Outline ................................................................................................................................ 3 2
1.2.2 Circuit.................................................................................................................................. 3 4
1.3 Engine PCB...................................................................................................................... 3 6
1.4 Power Supply ................................................................................................................... 3 6
1.4.1 Low voltage power supply .................................................................................................. 3 6
1.4.2 High voltage power supply ................................................................................................. 3 8
2. MECHANICS ...........................................................................................................3 9
2.1 Overview of Printing Mechanism...................................................................................... 3 9
2.2 Paper Transfer ...............................................................................................................311
2.2.1 Paper supply..................................................................................................................... 3 11
2.2.2 Paper registration ............................................................................................................. 3 11
2.2.3 Paper eject........................................................................................................................ 3 12
2.3 Sensors .......................................................................................................................... 3 13
2.3.1 Cover open sensor ........................................................................................................... 3 13
2.3.2 Multi paper tray paper empty sensor ................................................................................ 3 13
2.3.3 Tray paper empty sensor.................................................................................................. 3 14
2.3.4 Face up open sensor / Fuser exit sensor ......................................................................... 3 14
2.3.5 Full stack sensor............................................................................................................... 3 15
2.3.6 Eject sensor ...................................................................................................................... 3 15
2.3.7 Paper size sensor / Tray ID sensor .................................................................................. 3 16
2.3.8 Toner sensors................................................................................................................... 3 16
2.4 Drum Unit ....................................................................................................................... 3 17
2.4.1 Photosensitive drum ......................................................................................................... 3 17
2.4.2 Primary charging roller...................................................................................................... 3 17
2.4.3 Transfer roller ................................................................................................................... 3 17
2.4.4 Cleaner ............................................................................................................................. 3 17
2.5 Toner cartridge............................................................................................................... 3 17
2.6 Print Process.................................................................................................................. 3 18
2.6.1 Charging ........................................................................................................................... 3 18
2.6.2 Exposure stage................................................................................................................. 3 18
2.6.3 Developing........................................................................................................................ 3 20
2.6.4 Transfer ............................................................................................................................ 3 20
2.6.5 Cleaning............................................................................................................................ 3 21
2.6.6 Fixing stage ...................................................................................................................... 3 21
CHAPTER 4 DISASSEMBLY AND RE-ASSEMBLY.............................. 4-1
1. SAFETY PRECAUTIONS........................................................................................4 1
2. DISASSEMBLY FLOW ............................................................................................4 6
3. DISASSEMBLY PROCEDURE................................................................................4 7
3.1 AC Cord ........................................................................................................................... 4 7
3.2 Drum unit assembly ......................................................................................................... 4 7
3.3 Paper Tray ....................................................................................................................... 4 8
3.4 MP Tray.......................................................................................................................... 4 14
3.5 FU Protection Cover....................................................................................................... 4 16
3.6 Side Cover L / R.............................................................................................................417
3.7 Switch Panel................................................................................................................... 4 19
3.8 Open Cover / Top Cover................................................................................................ 4 21

HL-2460 SERVICE MANUAL
v
3.9 Back Cover ASSY.......................................................................................................... 4 26
3.10 Fixing Unit ...................................................................................................................... 4 28
3.11 Paper Eject..................................................................................................................... 4 37
3.12 Laser Unit....................................................................................................................... 4 40
3.13 Front Cover 1 / Front Cover 2 ....................................................................................... 4 41
3.14 MP Tray Unit .................................................................................................................. 4 43
3.15 Fan Motor 80.................................................................................................................. 4 48
3.16 Main Motor ASSY........................................................................................................... 4 50
3.17 Feeding Motor ASSY A/B............................................................................................... 4 51
3.18 Drive Unit ....................................................................................................................... 4 52
3.19 Electromagnetic Clutch Regist ....................................................................................... 4 55
3.20 Main PCB ....................................................................................................................... 4 56
3.21 Engine PCB.................................................................................................................... 4 57
3.22 Base Plate...................................................................................................................... 4 57
3.23 Low voltage Power Supply PCB ASSY / High voltage Power Supply PCB ASSY ........ 4 58
3.24 Front Guide ASSY.......................................................................................................... 4 60
3.25 Transfer Base ASSY ...................................................................................................... 4 61
3.26 Paper Feed .................................................................................................................... 4 67
3.27 Size SW PCB .................................................................................................................4 75
3.28 Fan Motor 60.................................................................................................................. 4 77
3.29 Ejection Gear Unit ..........................................................................................................4 78
4. LUBRICATION ......................................................................................................4 79
5. PACKING ..............................................................................................................4 84
CHAPTER 5 PERIODIC MAINTENANCE............................................... 5-1
1. CONSUMABLE PARTS...........................................................................................5 1
1.1 Drum Unit ......................................................................................................................... 5 1
1.2 Toner Cartridge ................................................................................................................ 5 3
2. PERIODICAL REPLACEMENT PARTS...................................................................5 6
3. PERIODICAL CLEANING........................................................................................5 7
3.1 Cleaning the Printer Exterior ............................................................................................ 5 7
3.2 Cleaning the Printer Interior ............................................................................................. 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 Call Messages .................................................................................................. 6 4
2.2 Service Call Messages..................................................................................................... 6 7
3. PAPER PROBLEMS..............................................................................................6 11

TABLE OF CONTENTS
vi
3.1 Paper Loading Problems................................................................................................ 6 11
3.2 Paper Jams .................................................................................................................... 6 12
3.2.1 Clearing jammed paper..................................................................................................... 6 14
3.2.2 Countermeasures for paper jams ..................................................................................... 6 22
3.3 Paper Feeding Problems ............................................................................................... 6 23
4. SOFTWARE SETTING PROBLEMS .....................................................................6 25
5. MALFUNCTIONS ..................................................................................................6 28
6. IMAGE DEFECTS .................................................................................................6 34
6.1 Image Defect Examples ................................................................................................. 6 34
6.2 Troubleshooting Image Defect ....................................................................................... 6 35
6.3 Location of Grounding Contacts..................................................................................... 6 54
6.3.1 Drum unit.............................................................................................................. 6 54
6.3.2 Printer body & Paper tray......................................................................................6.54
7. INCORRECT PRINTOUT ......................................................................................6 55
8. NETWORK PROBLEM..........................................................................................6 58
8.1 Installation Problem........................................................................................................ 6 58
8.2 Intermittent Problem....................................................................................................... 6 59
8.3 TCP/IP Troubleshooting................................................................................................. 6 60
8.4 UNIX Troubleshooting.................................................................................................... 6 60
8.5 Windows NT/LAN Server (TCP/IP) Troubleshooting ..................................................... 6 61
8.6 Windows 95/98/Me Peer to Peer Print (LPR) Troubleshooting...................................... 6 61
8.7 Windows 95/98/Me Peer to Peer (HP JetAdmin Compatible Method) Troubleshooting .......... 6 62
8.8 Windows 95/98/Me/NT 4.0/2000/XP Peer to Peer Print (NetBIOS) Troubleshooting .... 6 62
8.9 Internet Print (TCP/IP) Troubleshooting......................................................................... 6 62
8.10 Windows 95/98/Me/2000/XP IPP Troubleshooting ........................................................ 6 63
8.11 Novell Netware Troubleshooting .................................................................................... 6 63
8.12 AppleTalk Troubleshooting ............................................................................................ 6 64
8.13 Apple TCP/IP Printing (System 8.6 or later)................................................................... 6 64
8.14 DLC/LLC Troubleshooting.............................................................................................. 6 64
8.15 LAT Troubleshooting...................................................................................................... 6 64
8.16 Banyan VINES Troubleshooting .................................................................................... 6 66
8.17 Web Browser Troubleshooting (TCP/IP)........................................................................ 6 66
9. INSPECTION MODE .............................................................................................6 67
9.1 Before the Operation...................................................................................................... 6 67
9.2 Line Inspection Mode Procedure ................................................................................... 6 67
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 9
3.1 Entering the Service Menu Mode..................................................................................... 7 9
3.2 Function Table ................................................................................................................. 7 9

HL-2460 SERVICE MANUAL
vii
4. OTHER HIDDEN FUNCTION MENUS ..................................................................7 13
4.1 Hidden Function Menus Enabled by Pressing Switch(es) When Turning the Machine on ....
....................................................................................................................................... 7 13
4.2 Parts life Reset Function ................................................................................................ 7 14
APPENDICES
1. CONNECTION DIAGRAM, HL 7050 ...................................................................... A 1
2. MAIN PCB CIRCUIT DIAGRAM, HL 7050 (1/9) ..................................................... A 2
3. MAIN PCB CIRCUIT DIAGRAM, HL 7050 (2/9) ..................................................... A 3
4. MAIN PCB CIRCUIT DIAGRAM, HL 7050 (3/9) ..................................................... A 4
5. MAIN PCB CIRCUIT DIAGRAM, HL 7050 (4/9) ..................................................... A 5
6. MAIN PCB CIRCUIT DIAGRAM, HL 7050 (5/9) ..................................................... A 6
7. MAIN PCB CIRCUIT DIAGRAM, HL 7050 (6/9) ..................................................... A 7
8. MAIN PCB CIRCUIT DIAGRAM, HL 7050 (7/9) ..................................................... A 8
9. MAIN PCB CIRCUIT DIAGRAM, HL 7050 (8/9) ..................................................... A 9
10. MAIN PCB CIRCUIT DIAGRAM, HL 7050 (9/9) ................................................... A 10
11. ENGINE PCB CIRCUIT DIAGRAM, HL 7050 (1/3)............................................... A 11
12. ENGINE PCB CIRCUIT DIAGRAM, HL 7050 (2/3)............................................... A 12
13. ENGINE PCB CIRCUIT DIAGRAM, HL 7050 (3/3)............................................... A 13
14. LOW VOLTAGE POWER SUPPLY PCB CIRCUIT DIAGRAM (100V),
HL 7050 (1/2) ...................................................................................................... A 14
15. LOW VOLTAGE POWER SUPPLY PCB CIRCUIT DIAGRAM (200V),
HL7050 (2/2)......................................................................................................... A 15
16. SERIAL NO. DESCRIPTIONS.............................................................................. A 16
17. DIAMETER / CIRCUMFERENCE OF ROLLERS.................................................. A 18
18. PRINT SPEEDS WITH VARIOUS SETTINGS...................................................... A 19
19. HOW TO KNOW PAGE COUNTER & PARTS LIFE............................................. A 21
20. HOW TO USE THE SELF DIAGNOSTICS TOOLS.............................................. A 23
21. NVRAM DEFAULT VALUE................................................................................... A 27
22. PAPER TRAY INFORMATION (FOR EUROPE ONLY)........................................ A 28
23. GUIDELINES FOR LEAD FREE SOLDER ........................................................... A 29
24. TONER CARTRIDGE WEIGHT INFORMATION .................................................. A 32
INDEX

REGULATION
viii
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.

HL-2460 SERVICE MANUAL
ix
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.
CLASS 1LASER PRODUCT
APPAREIL Å LASER DE CLASSE 1
LASER KLASSE 1 PRODUKT
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.

SAFETY INFORMATION
x
SAFETY INFORMATION
CAUTION FOR LASER PRODUCT (WARNHINWEIS FUR LASER DRUCKER)
CAUTION: When the machine during servicing is operated with the cover open, the
regulations of VBG 93 and the performance instructions for VBG 93 are
valid.
CAUTION: In case of any trouble with the laser unit, replace the laser unit itself. To
prevent direct exposure to the laser beam, do not try to open the enclosure
of the laser unit.
ACHTUNG: Im Falle von Störungen der Lasereinheit muß diese ersetzt werden. Das
Gehäuse der Lasereinheit darf nicht geöffnet werden, da sonst
Laserstrahlen austreten können.
<Location of the laser beam window>
LITHIUM BATTERIES
CAUTION: DANGER OF EXPLOSION IF BATTERY IS INCORRECTLY REPLACED.
REPLACE ONLY WITH THE SAME OR EQUIVALENT TYPE
RECOMMENDED BY THE MANUFACTURER.
DISPOSE OF USED BATTERIES ACCORDING TO THE
MANUFACTURERS INSTRUCTIONS.
VORSICHT: EXPLOSIONSGEFAHR BEI UNSACHGEMÄßEM AUSTAUSCH DER
BATTERIE.
ERSATZ NUR DURCH DENSELBEN ODER EINEN VOM HERSTELLER
EMPFOHLENEN ÄHNLICHEN TYP.
ENTSORGUNG GEBRAUCHTER BATTERIEN NACH ANGABEN DES
HERSTELLERS.

HL-2460 SERVICE MANUAL
xi
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.
DANGER
iPELIGRO!
FARE
FARE
ATTENTIE
DANGER
VARNING
VAROITUS
GEFAHR

SAFETY INFORMATION
xii
DEFINITIONS OF WARNINGS, CAUTIONS AND NOTES
The following conventions are used in this service manual:
WARNING
Indicates warnings that must be observed to prevent possible personal injury.
!
CAU ION:
Indica es cau ions ha mus be observed o service he prin er properly or preven damage
o he prin er.
NOTE:
Indica es no es and useful ips o remember when servicing he prin er.
**Listed below are the various kinds of WARNING messages included in this manual.
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.
Fuser is HOT!
Inside the printer Open the face-up output tray
WARNING
If malfunctions with the power plug inserted into the power outlet, special caution
should be exercised even if the power switch is you analyze OFF because it is a
single pole switch.

HL-7050 SERVICE MANUAL
1-1
CHAPTER 1 GENERAL
1. FEATURES
This printer has the following features;
High Resolution and Fast Print Speed
True 1200 X 1200 dots per inch (dpi), 600 x 600 dots per inch (dpi) and true 300 x 300 dots
per inch (dpi) for graphics with microfine toner and up to 28 pages per minutes (ppm) print
speed (A4) and 30 pages per minutes (ppm) print speed (Letter paper).
Versatile Paper Handling
The printer loads paper automatically from the paper tray. The paper tray can hold A4, letter,
B5 (ISO), B5 (JIS), A5, B6 (ISO), A6, Executive and Legal size paper. The manual feed tray
allows manual paper loading sheet by sheet so you can use a variety of types and sizes of
paper.
Front Operation
Basic operation of the printer can be controlled from the front panel.
Enhanced Printing Performance and User-Friendly Operation for Windows


The dedicated printer driver for MicrosoftWindows95/98/Me and WindowsNT
4.0/2000/XP are available on the CD-ROM supplied with your printer. You can easily install
them into your Windowssystem using our installer program. The driver allows you to choose
various printer settings including toner save mode, custom paper size, sleep mode, gray scale
adjustment, resolution, watermark and many other layout functions. You can easily setup
these print options through the Printer Setup Menu.
Printer Status Monitor
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, you can get visual guidance on your PC screen on the actions to
take 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
1200 dpi graphic and text data, including large fonts, with the standard printer memory.
USB Interface (for Windows

98/2000/XP, iMac and Power Macintosh with USB installed)
The printer can be connected using the Universal Serial Bus (USB) interface to a PC or
Macintosh, which has the USB interface. Drivers that allow you to use the USB port are
provided on the CD-ROM supplied with the printer.

CHAPTER 1 GENERAL
1-2
Popular Printer Emulation Support
The printer supports the following printer emulation modes;
HP LaserJet (PCL6), Epson FX-850, IBM Proprinter XL, HP-GL and PostScriptLevel 3
language emulation (Brother BR-Script Level 3).
When you use DOS application software or Windowsversion 3.0 or earlier, you can use any
of these emulations to operate the printer. The printer also supports auto-emulation switching
between HP, Brother BR-Script 3, HP-GL and Epson or HP, BR-Script 3, HP-GL and IBM. If
you want to set the printer emulation, you can do it by operating the front panel.
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.
<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 16W when in sleep mode.
Bar Code Print
The printer can print the following 11 types of bar codes;
•Code 39 •US-PostNet •EAN-8
•Code 128 •ISBN •EAN-13
•Interleaved 2 of 5 •UPC-A •EAN-128
•Codabar •UPC-E
Network Feature
The Brother network printer has a 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/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.

HL-7050 SERVICE MANUAL
1-3
2. OVERVIEW
<Front View>
Fig. 1-1
<Rear View>
Fig. 1-2
Parallel interface connector
Upper paper cassette (Tray 1)
Multi-purpose extension flap
Multi-purpose tray
Top cover
Face down output tray
Extension flap Control panel
USB connector
Face up output tray
Serial interface connector
Network board slot
(for optional Network board)
Card slot
(for optional CompactFlashTM card)
AC power inlet Power switch

CHAPTER 1 GENERAL
1-4
3. SPECIFICATIONS
3.1 Printing
Print method Electrophotography (single-component dry toner)
Laser Semiconductor laser
Wave length: 788 nm
Output: 15mW max
Resolution 1200dpi (for Windows®95/98/Me, WindowsNT®4.0, Windows®2000
Windows® XP and Mac OS)
600 dpi (for Windows®95/98/Me, WindowsNT®4.0, Windows®2000,
Windows® XP, DOS and Mac OS)
300 dpi (for Windows®95/98/Me, WindowsNT®4.0, Windows®2000,
Windows® XP and Mac OS)
Print quality Normal printing mode
Economy printing mode (up to 20% toner saving)
Print speed Up to 28 ppm*
(When loading A4 )
Up to 30 ppm*
(When loading Letter-size paper.)
Warm-up Max. 20 seconds at 23°C (68°F)
First print Approx. 11 seconds
(When loading A4 or Letter-size paper using face down print delivery
from the paper tray.)
Consumables Toner cartridge
Life expectancy: 12,000 single-sided pages/cartridge
Drum unit
Life expectancy: 40,000 single-sided pages/unit
(When printing A4 or Letter-size paper with the print density set at
level 0 with about 5% print coverage)
*NOTE:
Print speed varies depending on the paper size or print paper type. For details, refer to
APPENDIX 18 ‘PRINT SPEEDS WITH VARIOUS SETTINGS’.

HL-7050 SERVICE MANUAL
1-5
3.2 Functions
CPU Toshiba TMPR4955 266MHz
Emulation Brother Printing Solution for Windows
Automatic emulation selection among HP LaserJet 5(PCL 6), Brother
BR-Script 3, HP-GL, EPSON FX-850 or IBM Proprinter XL
Printer driver <PCL Driver>
Windows95/98/Me, WindowsNT 4.0/2000/XP driver, supporting
Brother Native Compression mode
<PS Driver>
PPD file driver for Windows95/98/Me, Windows NT4.0/2000/XP
driver and Macintosh driver
Interface •Bi-directional parallel
•Universal Serial Bus (USB)
•RS-232C
•Network
Memory HL7050/HL7050N : 32.0 Mbytes*1
Expandable up to 288 Mbytes by installing an industry standard
DIMM*2
Control Panel •Display LCD: 2 lines by 16-column liquid crystal display with
a three color back light
LED: 1 LED
•Buttons: 7 buttons
Diagnostics Self-diagnostic program
1NOTE:
The standard memory installed varies depending on the country.
*2NOTE:
The DIMM (Dual in Line Memory Module) must have the following specifications: -
Type: 100 pin
Access time: 60 nsec - 80 nsec
Capacity: 16, 32, 64, 128 Mbytes
Height: 35.0 mm (1.38 inches) or less
Output: 32 bit or 36 bit (independent of parity)
3.3 Options
Paper handling •Lower tray unit (LT-7000); Maximum 500 sheets x 3 trays
•Duplex unit for duplex printing (DX-7000)
•Mailbox unit for output source (MX-7000 series)
Stabilizer Stabilizer for safe installation of the printer with options fitted (SB-
4000)
Storage Device Hard Disk Drive (HD-EX), CompackFlash Card (Not provided by
Brother)

CHAPTER 1 GENERAL
1-6
3.4 Electrical and Mechanical
Power source U.S.A. and Canada: AC 110 to 120V, 50 Hz/60 Hz
Europe and Australia: AC 220 to 240V, 50 Hz/60 Hz
Power consumption Printing (average): 690 W or less (when printing plain paper at
25°C)
Standing by: 110 W or less (at 25°C)
Sleep*1: 16 W or less (default activation time: 30 min.)
Noise Printing: Lwad = about 67 dB (A) *2
Lwad = about 48 dB (A)
Temperature Operating: 10 to 32.5°C (50 to 90.5°F)
Storage: 0 to 35°C (38 to 95°F)
Humidity Operating: 20 to 80% (non condensing)
Storage: 10 to 80% (non condensing)
Dimensions Printer: 485 x 480 x 421 mm (W x D x H)
(19.1 x 18.9 x 16.6 inches)
Carton: 575 x 665 x 570 mm (W x D x H)
(22.6 x 26.2 x 22.4 inches)
Weight Printer: Approx. 24.1 kg (53.1 lb.) (Excluded Toner and Drum)
Carton: Approx. 30.6 kg (67.5 lb.) (Included Toner, Drum and Carton)
*1NOTE:
The power consumption figure quoted for sleep mode is when the fan has stopped.
*2NOTE:
You might want to install printers with a sound power level of Lwad 63 dB (A) or more in a
separate room or cubicle.