Brother HL-6050 User manual

Brother Laser Printer
SERVICE MANUAL
MODEL: HL-6050/6050D/6050DN
Read this manual thoroughly before maintenance work.
Keep this manual in a convenient place for quick and easy reference at all times.
October 2003
SM-PRN048

HL-6050/6050D/6050DN 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-6050/6050D/6050DN 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: SERVICE SUPPORT SOFTWARE
Professional menu mode and Service menu mode, etc.
APPENDIX: 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 Electrical and Mechanical................................................................................................1-6
3.4 Network (NC-6100H) .......................................................................................................1-7
3.5 Paper................................................................................................................................1-8
3.5.1 Feedable paper...................................................................................................................1-8
3.5.2 Paper tray capacity ........................................................................................................... 1-10
3.5.3 Print delivery ..................................................................................................................... 1-10
3.6 Printing Area ..................................................................................................................1-11
3.7 Print Speeds with Various Settings................................................................................1-13
3.8 Toner Cartridge Weight Information ..............................................................................1-14
4. SERIAL NO. DESCRIPTIONS.................................................................................1-15
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 Install the drum unit assembly.............................................................................................2-5
3.1.2 Load paper into the paper tray............................................................................................2-6
3.1.3 Print a test page..................................................................................................................2-7
3.1.4 Setting our language on the control panel........................................................................... 2-7
4. CONTROL PANEL OPERATION..............................................................................2-8
4.1 Data LED Indications.......................................................................................................2-8
4.2 Panel Switches Functions................................................................................................ 2-9
4.2.1 Go button............................................................................................................................2-9
4.2.2 Job Cancel button...............................................................................................................2-9
4.2.3 Reprint button ................................................................................................................... 2-10
4.2.4 + & - button ....................................................................................................................... 2-14
4.2.5 Set button.......................................................................................................................... 2-14
4.2.6 Back button....................................................................................................................... 2-14
4.3 LCD Display...................................................................................................................2-14

HL-6050/6050D/6050DN SERVICE MANUAL
iii
4.3.1 Backlights.......................................................................................................................... 2-15
4.3.2 Printer status messages.................................................................................................... 2-15
4.4 How to Use the Control Panel........................................................................................2-16
4.5 Control Panel Setting Menu...........................................................................................2-17
4.5.1 Information........................................................................................................................ 2-18
4.5.2 Paper ................................................................................................................................ 2-19
4.5.3 Quality............................................................................................................................... 2-19
4.5.4 Setup................................................................................................................................. 2-20
4.5.5 Print menu......................................................................................................................... 2-21
4.5.6 Network (HL-6050DN only) ............................................................................................... 2-25
4.5.7 Interface............................................................................................................................ 2-26
4.5.8 Reset menu....................................................................................................................... 2-26
4.5.9 Set IP address .................................................................................................................. 2-27
4.5.10 About emulation modes .................................................................................................... 2-28
4.5.11 List of factory settings ....................................................................................................... 2-28
4.6 Other Control Features..................................................................................................2-32
4.6.1 Sleep mode....................................................................................................................... 2-32
4.6.2 Inspection mode................................................................................................................ 2-32
5. NETWORK BOARD OPERATION ..........................................................................2-33
5.1 Installing the Network Board..........................................................................................2-33
5.2 Functions........................................................................................................................2-35
5.2.1 LED functions.................................................................................................................... 2-35
5.2.2 Factory default setting....................................................................................................... 2-35
6. PAPER TRAY INFORMATION (FOR EUROPE ONLY)..........................................2-36
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 CPU ....................................................................................................................................3-3
1.3.2 USB.....................................................................................................................................3-4
1.3.3 IEEE1284............................................................................................................................3-4
1.3.4 Network Interface................................................................................................................3-5
1.3.5 ROM....................................................................................................................................3-6
1.3.6 Flash ROM..........................................................................................................................3-7
1.3.7 SDRAM...............................................................................................................................3-8
1.3.8 Optional RAM......................................................................................................................3-9
1.3.9 Compact Flash.................................................................................................................. 3-10
1.3.10 EEPROM .......................................................................................................................... 3-10
1.3.11 Reset Circuit ..................................................................................................................... 3-11
1.3.12 Engine I/O......................................................................................................................... 3-11
1.3.13 Panel I/O........................................................................................................................... 3-11
1.3.14 Video I/O........................................................................................................................... 3-12
1.3.15 Sensor I/O......................................................................................................................... 3-13
1.3.16 Power Supply.................................................................................................................... 3-13
1.4 Engine PCB....................................................................................................................3-14
1.5 Power Supply.................................................................................................................3-15
1.5.1 Low-voltage Power Supply................................................................................................ 3-15

TABLE OF CONTENTS
iv
1.5.2 High-voltage Power Supply............................................................................................... 3-16
2. MECHANICS...........................................................................................................3-17
2.1 Overview of Printing Mechanism ...................................................................................3-17
2.2 Paper Transfer...............................................................................................................3-18
2.2.1 Paper supply..................................................................................................................... 3-18
2.2.2 Paper tray lift function ....................................................................................................... 3-18
2.2.3 Paper particle remover unit............................................................................................... 3-19
2.2.4 Paper registration.............................................................................................................. 3-20
2.2.5 Paper eject........................................................................................................................ 3-21
2.2.6 Duplex printing (HL-6050D/6050DN only).........................................................................3-21
2.3 Sensors..........................................................................................................................3-22
2.3.1 Document cover sensor....................................................................................................3-22
2.3.2 Fixing sensor PCB ASSY.................................................................................................. 3-22
2.3.3 Photo interrupter ............................................................................................................... 3-23
2.3.4 Toner sensor PCB unit / Toner LED PCB ASSY............................................................... 3-23
2.3.5 Relay PCB unit.................................................................................................................. 3-24
2.3.6 PE/PO sensor PCB ASSY ................................................................................................3-24
2.3.7 DEV sensor ASSY ............................................................................................................ 3-25
2.3.8 MP sensor PCB ASSY...................................................................................................... 3-25
2.4 Drum Unit.......................................................................................................................3-26
2.4.1 Photosensitive drum.......................................................................................................... 3-26
2.4.2 Primary charger................................................................................................................. 3-26
2.4.3 Transfer roller.................................................................................................................... 3-26
2.4.4 Cleaner ............................................................................................................................. 3-26
2.5 Toner Cartridge..............................................................................................................3-27
2.5.1 Toner empty mode............................................................................................................ 3-27
2.5.2 New toner detection boss.................................................................................................. 3-28
2.6 Print Process..................................................................................................................3-29
2.6.1 Charging ........................................................................................................................... 3-29
2.6.2 Exposure stage................................................................................................................. 3-29
2.6.3 Pressure contact and release unit..................................................................................... 3-31
2.6.4 Developing........................................................................................................................ 3-31
2.6.5 Transfer............................................................................................................................. 3-32
2.6.6 Fixing stage....................................................................................................................... 3-32
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 Tray .......................................................................................................................4-4
3.4 Access Cover...................................................................................................................4-7
3.5 Network Board .................................................................................................................4-7
3.6 DX Feed ASSY ................................................................................................................4-8
3.7 Rear Cover ASSY..........................................................................................................4-12
3.8 Top Cover ASSY............................................................................................................4-13
3.9 Side Cover L ..................................................................................................................4-15
3.10 Side Cover R..................................................................................................................4-16

HL-6050/6050D/6050DN SERVICE MANUAL
3.11 MP Paper Guide 1 ASSY...............................................................................................4-16
3.12 Process Unit Cover ASSY / MP Cover ASSY................................................................4-17
3.13 Exit Roller Unit ...............................................................................................................4-18
3.14 Laser Unit.......................................................................................................................4-20
3.15 Fixing Unit......................................................................................................................4-21
3.16 Separation Roller ASSY / Feed Roller ASSY................................................................4-32
3.17 Feed MP Unit.................................................................................................................4-33
3.18 Fan Motor 80 ASSY.......................................................................................................4-34
3.19 Filter ...............................................................................................................................4-35
3.20 Engine PCB....................................................................................................................4-35
3.21 Main PCB.......................................................................................................................4-36
3.22 Fan 40............................................................................................................................4-36
3.23 LVPS..............................................................................................................................4-37
3.24 Photo Interrupter............................................................................................................4-39
3.25 T1 Solenoid ASSY / MP Solenoid ASSY.......................................................................4-39
3.26 Clutch Spring Separating...............................................................................................4-41
3.27 Magnetic Clutch Regist /Collar 6 ...................................................................................4-41
3.28 Main Motor.....................................................................................................................4-42
3.29 Developer Clutch ...........................................................................................................4-43
3.30 Develop Joint .................................................................................................................4-43
3.31 Interlock SW ASSY........................................................................................................ 4-44
3.32 Relay PCB L ASSY........................................................................................................4-44
3.33 DEV Sensor ASSY.........................................................................................................4-45
3.34 Toner LED PCB ASSY...................................................................................................4-45
3.35 Gear 18/48 / Gear Collar................................................................................................4-46
3.36 Gear 24..........................................................................................................................4-46
3.37 Plate Motor ASSY..........................................................................................................4-47
3.38 DX Sensor PCB .............................................................................................................4-48
3.39 Ejection Solenoid ASSY.................................................................................................4-49
3.40 Size SW PCB ASSY / Size SW Spring..........................................................................4-50
3.41 Toner Sensor PCB Unit .................................................................................................4-51
3.42 HVPS PCB ASSY ..........................................................................................................4-51
3.43 Relay PCB Unit..............................................................................................................4-52
3.44 Regist Actuator Front / Regist Actuator Rear / Regist Actuator Spring.........................4-52
3.45 PE/PO Sensor PCB ASSY.............................................................................................4-53
3.46 Tray PE Actuator............................................................................................................4-54
3.47 RE Roller........................................................................................................................4-55
3.48 F Chute Unit...................................................................................................................4-55
3.49 MP-PE Sensor Actuator 1 / MP Sensor PCB ASSY......................................................4-56
4. PACKING ................................................................................................................4-61
5. GUIDELINES FOR LEAD FREE SOLDER..............................................................4-62
6. LUBRICATION ........................................................................................................4-65
7. HARNESS ROUTING..............................................................................................4-69

TABLE OF CONTENTS
vi
CHAPTER 5 PERIODIC MAINTENANCE............................................... 5-1
1. CONSUMABLE PARTS.............................................................................................5-1
1.1 Drum Unit.........................................................................................................................5-1
1.2 Toner Cartridge................................................................................................................5-4
2. PERIODICAL REPLACEMENT PARTS....................................................................5-7
2.1 Fixing Unit........................................................................................................................5-8
2.2 Paper Feeding Kit MP....................................................................................................5-10
2.3 Paper Feeding Kit Tray.................................................................................................. 5-11
2.4 Laser Unit.......................................................................................................................5-12
3. PERIODICAL CLEANING........................................................................................5-15
3.1 Cleaning the Printer Exterior..........................................................................................5-15
3.2 Cleaning the corona wire............................................................................................... 5-16
3.3 Cleaning the Scanner Window ......................................................................................5-17
3.4 Cleaning the Electrical Terminals ..................................................................................5-18
4. MTBF / MTTR..........................................................................................................5-19
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....................................................................................................................6-7
3. PAPER PROBLEMS................................................................................................6-11
3.1 Paper Loading Problems ...............................................................................................6-11
3.2 Paper Jams....................................................................................................................6-13
3.2.1 Clearing jammed paper..................................................................................................... 6-14
3.2.2 Causes & countermeasures.............................................................................................. 6-21
3.3 Paper Feeding Problems...............................................................................................6-22
4. SOFTWARE SETTING PROBLEMS.......................................................................6-24
5. MALFUNCTIONS ....................................................................................................6-27
6. IMAGE DEFECTS...................................................................................................6-33
6.1 Image Defect Examples.................................................................................................6-33
6.2 Troubleshooting Image Defect.......................................................................................6-34
6.3 Location of Grounding Contacts ....................................................................................6-52
6.3.1 Process unit...................................................................................................................... 6-52
6.3.2 Printer body & Paper tray.................................................................................................. 6-52
7. INCORRECT PRINTOUT........................................................................................6-53
8. NETWORK PROBLEM............................................................................................6-56
8.1 Installation Problem .......................................................................................................6-56
8.2 Intermittent Problem.......................................................................................................6-57
8.3 TCP/IP Troubleshooting................................................................................................. 6-58
8.4 UNIX Troubleshooting....................................................................................................6-58
8.5 Windows NT/LAN Server (TCP/IP) Troubleshooting..................................................... 6-59

vii
8.6 Windows 95/98/Me (or later) Peer to Peer Print (LPR) Troubleshooting ...................... 6-59
8.7 Windows 95/98/Me Peer to Peer (HP JetAdmin Compatible Method) Troubleshooting .......6-60
8.8 Windows 95/98/Me/NT 4.0 Peer to Peer Print (NetBIOS) Troubleshooting..................6-60
8.9 Brother Internet Print (TCP/IP) Troubleshooting ...........................................................6-60
8.10 Windows 95/98/Me/2000/XP IPP Troubleshooting........................................................6-61
8.11 Novell Netware Troubleshooting....................................................................................6-62
8.12 AppleTalk Troubleshooting............................................................................................ 6-63
8.13 DLC/LLC Troubleshooting .............................................................................................6-63
8.14 Web Browser Troubleshooting (TCP/IP) .......................................................................6-63
CHAPTER 7 SERVICE SUPPORT SOFTWARE.................................... 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............................................................................................7-8
3.1 Entering the Service Menu Mode ....................................................................................7-8
3.2 Function Table .................................................................................................................7-8
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
5. PRINT SETTINGS...................................................................................................7-15
5.1 Printing out the Print Settings ........................................................................................7-15
5.2 Contents Overview.........................................................................................................7-16
5.2.1 Page 1............................................................................................................................... 7-16
5.2.2 Page 2............................................................................................................................... 7-16
5.2.3 Page 3 (HL-6050DN only)................................................................................................. 7-17
6. HOW TO USE THE SELF-DIAGNOSTICS TOOLS ................................................7-18
6.1 Troubleshooting for Printer won’t print...........................................................................7-18
6.2 Diagnostics.....................................................................................................................7-19
6.3 Printer Information .........................................................................................................7-21
7. NVRAM DEFAULT VALUE......................................................................................7-22
8. HOW TO REWRITE HL-6050/6050D/6050DN FLASH ROM..................................7-23
9. NVRAM BACKUP....................................................................................................7-29
APPENDIX
1. MAIN PCB CIRCUIT DIAGRAM, HL-6050 (1/6)....................................................... A-1
2. MAIN PCB CIRCUIT DIAGRAM, HL-6050 (2/6)....................................................... A-2
3. MAIN PCB CIRCUIT DIAGRAM, HL-6050 (3/6)....................................................... A-3
4. MAIN PCB CIRCUIT DIAGRAM, HL-6050 (4/6)....................................................... A-4
5. MAIN PCB CIRCUIT DIAGRAM, HL-6050 (5/6)....................................................... A-5
6. MAIN PCB CIRCUIT DIAGRAM, HL-6050 (6/6)....................................................... A-6
7. BLOCK DIAGRAM, HL-6050.................................................................................... A-7

TABLE OF CONTENTS
viii
8. LOW-VOLTAGE POWER SUPPLY PCB CIRCUIT DIAGRAM (100V), HL-6050 .... A-8
9. LOW-VOLTAGE POWER SUPPLY PCB CIRCUIT DIAGRAM (200V), HL-6050 .... A-9
10. HIGH-VOLTAGE POWER SUPPLY PCB CIRCUIT DIAGRAM, HL-6050 ............. A-10
11. ENGINE PCB CIRCUIT DIAGRAM, HL-6050 (1/2)................................................ A-11
12. ENGINE PCB CIRCUIT DIAGRAM, HL-6050 (2/2)................................................ A-12

Brother Laser Printer
PARTS REFERENCE LIST
MODEL:
HL-6050/6050D/6050DN
Read this list thoroughly before maintenance work.
Keep this list in a convenient place for quick and easy reference at all times.
October 2003
PL-PRN063

Brother HL-6050 HL-6050D HL-6050DN service manual
Brother HL-6050 HL-6050D HL-6050DN service manual
Brother HL-6050 HL-6050D HL-6050DN service manual
Brother HL-6050 HL-6050D HL-6050DN service manual
Brother HL-6050 HL-6050D HL-6050DN service manual
Brother HL-6050 HL-6050D HL-6050DN service manual
Brother HL-6050 HL-6050D HL-6050DN service manual
Brother HL-6050 HL-6050D HL-6050DN service manual
Brother HL-6050 HL-6050D HL-6050DN service manual