Brother HL-3400CN Series User manual

Brother Color Laser Printer
SERVICE MANUAL
MODEL: HL-3400CN
Read this manual thoroughly before commencing any maintenance work.
Keep this manual in a convenient place for quick and easy reference at all times.
March, 2000
SM-PRN005

HL-3400CN SERVICE MANUAL
i
PREFACE
This service manual contains basic information required for after-sales service of the color laser
printer (here-in-after 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-3400CN color laser printer.
This manual consists of the following chapters:
CHAPTER 1: OUTLINE OF PRODUCT
Features, parts names, internal structure, and description of the control panel.
CHAPTER 2: SPECIFICATIONS
Specifications, etc.
CHAPTER 3: INSTALLATION
Installation conditions and installation procedures.
CHAPTER 4: STRUCTURE OF SYSTEM COMPONENTS
Basic operation of the mechanical system, the electrical system and the electrical
circuits and their timing information.
CHAPTER 5: CONTROL PANEL OPERATION
Operation and setting procedures on the control panel.
CHAPTER 6: PERIODIC MAINTENANCE
Description of periodic maintenance parts and procedures for periodic replacement
and cleaning.
CHAPTER 7: DISASSEMBLY
Procedures for replacement of the mechanical system parts.
CHAPTER 8: TROUBLESHOOTING
Description of error messages on the control panel, troubleshooting image failure,
etc.
APPENDICES : SERIAL NO. DESCRIPTIONS, ETC.
Information in this manual is subject to change due to improvement or re-design 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
REGULATIONS................................................................................. vi
SAFETY INSTRUCTIONS............................................................... viii
SHIPMENT OF THE PRINTER.......................................................... xi
CHAPTER 1 PRODUCT OUTLINE.................................................. 1-3
1. FEATURES ....................................................................................................1-3
2. PARTS NAMES & FUNCTIONS.....................................................................1-6
3. INTERNAL STRUCTURE...............................................................................1-8
4. DESCRIPTION OF CONTROL PANEL..........................................................1-9
4.1 Video Controller Mode.........................................................................................................1-9
4.2 Engine Controller Mode........................................................................................................I-9
CHAPTER 2 SPECIFICATIONS...................................................... 2-3
1. RATING..........................................................................................................2-3
2. GENERAL SPECIFICATIONS ....................................................................... 2-4
2.1 Printing.................................................................................................................................2-4
2.2 Functions.............................................................................................................................2-4
2.3 Electrical and Mechanical....................................................................................................2-5
2.4 Paper...................................................................................................................................2-6
2.5 Printing Area........................................................................................................................2-8
3. ENVIRONMENTAL CONDITIONS................................................................2-11
3.1 Ambient Temperature / Humidity / Altitude........................................................................2-11
CHAPTER 3 INSTALLATION.......................................................... 3-3
1. CONDITIONS REQUIRED FOR INSTALLATION.......................................... 3-3
1.1 Environmental Conditions....................................................................................................3-3
1.2 Basic Layout of Printer Set-up Location..............................................................................3-3
2. UNPACKING..................................................................................................3-5
2.1 Unpacking of Printer............................................................................................................ 3-5
2.2 Unpack the Starter Kit .........................................................................................................3-7
3. INSTALLATION WORK..................................................................................3-8
3.1 Install the OPC Belt Cartridge .............................................................................................3-8
3.2 Install the Toner Cartridge into the Printer...........................................................................3-9
3.3 Install the Oil Bottle and Fuser Cleaner.............................................................................3-10
3.4 Install the Media Cassette and Adaptor............................................................................. 3-12
3.5 Test Print ...........................................................................................................................3-14

HL-3400CN SERVICE MANUAL
4. OPTIONS ......................................................................................................3-18
4.1 Lower Tray Unit .................................................................................................................3-18
4.2 Duplex Unit........................................................................................................................3-18
4.3 Font Card / Flash Memory Card / HDD Card ....................................................................3-18
4.4 Network Option..................................................................................................................3-19
4.5 RAM Expansion.................................................................................................................3-20
4.6 HDD (Hard Disk Drive)......................................................................................................3-21
CHAPTER 4 STRUCTURE OF SYSTEM COMPONENTS.............. 4-3
1. BASIC STRUCTURE...................................................................................... 4-3
1.1 Mechanical Structure...........................................................................................................4-3
1.2 Basic Mechanism of Color Printing......................................................................................4-5
1.3 Structure of the OPC Belt....................................................................................................4-7
1.4 Print System and Transfer System......................................................................................4-8
1.5 Scanning System...............................................................................................................4-23
1.6 Paper Transportation System............................................................................................4-25
1.7 Fusing Unit ........................................................................................................................4-26
2. STRUCTURE OF THE CONTROL SYSTEM................................................4-28
2.1 Basic Structure - Electrical System and Functions............................................................ 4-28
2.2 Control System - Control of the Print Process...................................................................4-37
2.3 Main PCB (Video Controller PCB).....................................................................................4-46
2.4 Low-voltage Power Supply Unit.........................................................................................4-60
2.5 High-voltage Power Supply Unit........................................................................................4-63
2.6 Connection Diagram..........................................................................................................4-65
CHAPTER 5 CONTROL PANEL OPERATION............................... 5-3
1. PANEL LAYOUT ............................................................................................ 5-3
2. VIDEO CONTROLLER MODE.......................................................................5-4
2.1 Configuration of Operational Mode......................................................................................5-4
2.2 Toner Save Mode / Power Save Mode................................................................................5-5
2.3 Line Test Mode.................................................................................................................... 5-6
2.4 DRAM Test Mode..............................................................................................................5-10
2.5 Program Version Display Mode.........................................................................................5-11
2.6 NVRAM Reset Mode .........................................................................................................5-13
3. ENGINE CONTROLLER MODE...................................................................5-14
3.1 Configuration of Operational Mode....................................................................................5-14
3.2 Operation of Normal Mode ................................................................................................5-16
3.3 Service Mode.....................................................................................................................5-23
3.4 Adjustment Work Procedures............................................................................................5-47

TABLE OF CONTENTS
CHAPTER 6 PERIODIC MAINTENANCE ....................................... 6-3
1. GENERAL ...................................................................................................... 6-3
1.1 Handling Precautions ..........................................................................................................6-3
1.2 List of Maintenance Tools............................................................................................................. 6-4
1.3 List of Consumables for Maintenance.................................................................................6-5
2. PERIODIC MAINTENANCE CLEANING......................................................... 6-6
2.1 Cleaning the Register Roller................................................................................................6-9
2.2 Cleaning the Paper Guide .................................................................................................6-10
2.3 Cleaning the Paper Exit Roller...........................................................................................6-11
2.4 Cleaning the Transfer Roller..............................................................................................6-12
2.5 Cleaning the Paper Discharger .........................................................................................6-13
2.6 Cleaning the OPC Belt Cartridge.......................................................................................6-14
2.7 Cleaning the Transfer Drum..............................................................................................6-15
2.8 Cleaning the Dustproof Glass in the Laser Unit ................................................................6-16
2.9 Cleaning the Printer Interior...............................................................................................6-17
2.10 Cleaning the Oil Pad........................................................................................................6-18
3. PERIODIC MAINTENANCE PARTS............................................................. 6-19
4. PERIODIC MAINTENANCE PROCEDURES................................................ 6-21
4.1 OPC Belt Cartridge Replacement...................................................................................... 6-21
4.2 Fusing Unit Replacement ..................................................................................................6-23
4.3 Transfer Roller Replacement.............................................................................................6-25
4.4 Paper Discharger Replacement ........................................................................................6-27
4.5 Drum Cleaner Replacement..............................................................................................6-29
4.6 Ozone Filter Replacement.................................................................................................6-31
4.7 Paper Feeding Roller and Separator Pad Replacement...................................................6-32
4.8 Transfer Drum Replacement............................................................................................. 6-33
4.9 Oil Pad Replacement......................................................................................................... 6-34
CHAPTER 7 DISASSEMBLY & RE-ASSEMBLY........................... 7-4
1. BEFORE STARTING DISASSEMBLY ........................................................... 7-4
1.1 Precautions.......................................................................................................................... 7-4
1.2 Preparation of Disassembly................................................................................................. 7-4
2. PARTS NAME................................................................................................7-6
2.1 Cover...................................................................................................................................7-6
2.2 Circuit Boards (PCBs) .........................................................................................................7-7
2.3 Motor Units .......................................................................................................................... 7-7
2.4 Clutches and Solenoids.......................................................................................................7-8
2.5 Sensors ............................................................................................................................... 7-8
3. DISASSEMBLY FLOW...................................................................................7-9
4. DISASSEMBLY PROCEDURE .................................................................... 7-10
4.1 Right Side of the Printer.....................................................................................................7-10
4.2 Top of the Printer...............................................................................................................7-23
4.3 Left Side of the Printer.......................................................................................................7-32
PR2000046

HL-3400CN SERVICE MANUAL
v
4.4 Paper Exit Unit...................................................................................................................7-40
4.5 Front of the Printer............................................................................................................. 7-45
4.6 Rear of the Printer .............................................................................................................7-48
4.7 Fusing Unit ........................................................................................................................7-53
CHAPTER 8 TROUBLESHOOTING................................................ 8-3
1. OUTLINE OF TROUBLESHOOTING.............................................................8-4
2. OPERATOR CALL .........................................................................................8-5
2.1 Video Controller Mode.........................................................................................................8-5
2.2 Engine Controller Mode.......................................................................................................8-8
3. PAPER TRANSPORT ERROR .................................................................... 8-11
3.1 Feed Jam...........................................................................................................................8-11
3.2 Inner Jam...........................................................................................................................8-12
3.3 Outer Jam.......................................................................................................................... 8-12
3.4 Others................................................................................................................................ 8-12
4. SERVICE CALL............................................................................................8-13
4.1 Video Controller Mode.......................................................................................................8-14
4.2 Engine Controller Mode.....................................................................................................8-16
5. IMAGE FAILURE..........................................................................................8-45
APPENDIX 1....................................................................................A-1
APPENDIX 2....................................................................................A-6
APPENDIX 3....................................................................................A-7
APPENDIX 4....................................................................................A-8
APPENDIX 5..................................................................................A-11
APPENDIX 6..................................................................................A-14
APPENDIX 7..................................................................................A-21
APPENDIX 8..................................................................................A-23
PR2000071

Brother Color Laser Printer
PARTS REFERENCE LIST
MODEL: HL-3400CN
Read this list thoroughly before maintenance work.
Keep this list in a convenient place for quick and easy reference at all times.
March, 2000
PL-PRN005

Brother HL-3400CN service manual
Brother HL-3400CN service manual
Brother HL-3400CN service manual
Brother HL-3400CN service manual
Brother HL-3400CN service manual
Brother HL-3400CN service manual
Brother HL-3400CN service manual
Brother HL-3400CN service manual
Brother HL-3400CN service manual