Service Manual Brother HL-3040CN, 3070CW;
This manual, Brother HL-3040CN, 3070CW, is in the PDF format and have detailed Diagrams, pictures and full procedures to diagnose and repair your Brother HL-3040CN, 3070CW copier.
You can print, zoom or read any diagram, picture or page from this Service Manual. Every chapter on this manual is fully detailed and contain all the simulation codes, trouble codes, maintenance procedures, reset procedures, diagnose procedures of Brother HL-3040CN, 3070CW photocopier. You can find easily everything what do you need.
To see what contain, please read table of contents:

PREFACE
REGULATION

CHAPTER 1: SPECIFICATIONS
1. COMPONENTS
2. SPECIFICATIONS LIST
2.1 General
2.2 Network Connectivity
2.3 Service Information
2.4 Consumables
2.5 Paper
2.5.1 Paper handling
2.5.2 Media specifications
2.5.3 Type and size of paper
2.6 Printable Area
2.7 Print Speeds with Various Settings

CHAPTER 2: THEORY OF OPERATION
1. GENERAL BLOCK DIAGRAM
2. ELECTRONICS GENERAL BLOCK DIAGRAM
3. MECHANICS
3.1 Cross-section Drawing
3.2 Paper Feeding
3.2.1 Plate-up function of the paper tray
3.2.2 Paper supply
3.2.3 Paper registration
3.2.4 Paper eject
3.2.5 Paper supply from manual feed slot and paper eject from back
3.3 Toner Cartridge
3.3.1 Type of toner cartridge
3.3.2 Life of toner cartridge
3.3.3 Method of detecting toner life
3.3.4 Relationship between toner amount and life of toner cartridge in number of rotations of develop roller
3.3.5 New toner detection
3.3.6 Method of counting the number of toner replacements
3.4 Principle of Color Overlapping
3.5 Basic Printing Principle
3.5.1 Charging
3.5.2 Exposure
3.5.3 Development
3.5.4 Transfer
3.5.5 Fusing
3.5.6 Toner cleaning
3.6 Location of Sensors
3.7 Adjustment of Color Registration
3.7.1 Color registration error in sub/main scanning direction
3.8 Adjustment of Color Density

CHAPTER 3: ERROR INDICATION AND TROUBLESHOOTING
1. INTRODUCTION
1.1 Precautions
1.2 Components
1.3 Initial Check
2. ERROR INDICATIONS
2.1 Error Codes
2.2 Error Messages
2.3 Error Cause and Remedy
3. PAPER FEEDING PROBLEMS
3.1 No Feeding
3.2 Double Feeding
3.3 Paper Jam
3.4 Dirt on Paper
3.5 Wrinkles on Paper
4. IMAGE DEFECT TROUBLESHOOTING
4.1 Image Defect Examples
4.2 Pitch Indicated in Roller Image
4.3 Troubleshooting Image Defect
5. SOFTWARE SETTING PROBLEMS
5.1 Cannot Print Data
6. NETWORK PROBLEMS
6.1 Cannot Make a Print through Network Connection
7. OTHERS PROBLEMS
7.1 The Machine is Not Turned ON, or The LCD Indication Does Not Appear
7.2 The Fan Does Not Work

CHAPTER 4: PERIODICAL MAINTENANCE
1. SAFETY PRECAUTIONS
2. CONSUMABLE PARTS
3. PERIODICAL MAINTENANCE PARTS
3.1 Periodical Maintenance Parts
3.2 Procedures to Replace Periodical Maintenance Parts
3.2.1 Fuser unit
3.2.2 Paper feeding kit

CHAPTER 5: DISASSEMBLY AND ASSEMBLY
1. SAFETY PRECAUTIONS
2. PACKING
3. SCREW TORQUE LIST
4. LUBRICATION
5. OVERVIEW OF GEARS
6. HARNESS ROUTING
7. DISASSEMBLY FLOW
8. DISASSEMBLY PROCEDURE
8.1 Support Flap
8.2 Roller Holder ASSY
8.3 Separation Pad ASSY
8.4 Back Cover/Back Cover Stopper L/R
8.5 Fuser Cover
8.6 Paper Eject Front Actuator
8.7 Fuser Unit
8.8 Side Cover L ASSY/Access Cover
8.9 Side Cover R ASSY
8.10 Control Panel Cover ASSY
8.11 Wireless LAN PCB ASSY (HL-3070CW only)
8.12 Panel PCB ASSY
8.13 Rubber Key Printed ASSY
8.14 LCD/Back Light Film
8.15 USB Direct Interface Relay PCB ASSY (HL-3070CW only)
8.16 Panel Light Guide
8.17 Front Cover
8.18 Manual Feed Slot ASSY
8.19 TC Arm Spring
8.20 Arm Guide L Cover
8.21 Top Cover Sub ASSY
8.22 Inner Chute 2 ASSY
8.23 FFC Harness:MAIN-LED CTL
8.24 LED Power Relay PCB ASSY
8.25 LED Head Control PCB ASSY
8.26 LED ASSY/Holder Hook
8.27 Z Spring L/Z Spring R
8.28 Develop Release Motor ASSY
8.29 Main PCB ASSY
8.30 Engine PCB ASSY
8.31 Main PCB Insulation Sheet/Engine Insulation Sheet
8.32 Main PCB Shield Plate
8.33 Engine Shield Plate
8.34 Registration Mark Relay PCB ASSY
8.35 Drum Develop Drive Unit
8.36 Develop Drive Motor
8.37 Paper Feed Motor ASSY
8.38 Paper Feed Unit
8.39 Registration Front/Rear Sensor PCB ASSY
8.40 Manual Sensor PCB ASSY
8.41 Pick-up Sector Gear Spring/Friction Spring
8.42 PF Registration Solenoid
8.43 Pick-up Solenoid/Pick-up Solenoid Lever Spring
8.44 Fuser/Eject Drive Motor
8.45 Fuser/Eject Drive Motor Sensor PCB ASSY
8.46 Top Cover Arm R
8.47 Top Cover Arm L
8.48 Air Filter Holder ASSY/Ozone Filter
8.49 Paper Eject Rear Actuator/Paper Eject Rear Actuator Spring/Paper Eject Rear Actuator Top
8.50 Eject Rear Sensor PCB ASSY
8.51 Eject Front Sensor PCB ASSY
8.52 Toner/New Sensor PCB ASSY
8.53 Belt Drive ASSY
8.54 Drum Motor Origin Sensor PCB ASSY
8.55 LV Fan ASSY
8.56 Main Fan ASSY
8.57 Low-voltage Power Supply PCB ASSY
8.58 Registration Sensor Holder ASSY
8.59 High-voltage Power Supply PCB ASSY
8.60 HVPS Control PCB ASSY
8.61 Waste Toner Sensor
8.62 Develop Release Sensor PCB ASSY
8.63 Belt Cleaner Spring
8.64 TR Head Spring
8.65 Side Frame R
8.66 Toner LED PCB ASSY/LED Holder
8.67 LM Hook B/LM Hook C/Hook Spring BC10

CHAPTER 6: DJUSTMENTS AND UPDATING OF SETTINGS, REQUIREDAFTER PARTS REPLACEMENT
1. IF YOU REPLACE THE MAIN PCB
1.1 Rewriting the Firmware (Main Firmware, Sub Firmware (GDI or PCL/PS))
1.1.1 Checking firmware version
1.1.2 Rewriting the firmware using computer
1.1.3 Rewriting the firmware using USB flash memory (HL-3070CW only)
1.2 Initialization of EEPROM of Main PCB (Maintenance Mode: Code 01)
1.3 Setting by Country (Maintenance Mode: Code 74)
1.4 Setting the Serial Number
1.5 Sensitivity Adjustment of Density Sensor (Maintenance Mode: Code 72)
1.6 Performing the Developing Bias Voltage Correction (Maintenance Mode: Code 83).6-12
1.7 Performing the Adjustment of Color Registration (Maintenance Mode: Code 66)
1.8 Operational Check of Control Panel Button (Maintenance Mode: Code 13)
1.9 Acquiring MAC Address (Ethernet Address) from Wireless LAN PCB (HL-3070CW only)
2. IF YOU REPLACE THE WIRELESS LAN PCB (HL-3070CW ONLY)
2.1 Acquiring MAC Address (Ethernet Address) from Main PCB
3. IF YOU REPLACE THE REGISTRATION SENSOR HOLDER ASSY
3.1 Sensitivity Adjustment of Density Sensor (Maintenance Mode: Code 72)

CHAPTER 7: SERVICE FUNCTIONS
1. MAINTENANCE MODE
1.1 How to Enter the Maintenance Mode
1.2 How to Enter the End User-accessible Maintenance Mode
1.3 List of Maintenance-mode Functions
1.4 Detailed Description of Maintenance-mode Functions
1.4.1 EEPROM parameter initialization (Function code 01, 91)
1.4.2 Monochrome image quality test pattern (Function code 09)
1.4.3 Worker switch (WSW) setting and printout (Function code 10, 11)
1.4.4 Operational check of LCD (Function code 12)
1.4.5 Operational check of control panel button (Function code 13)
1.4.6 Software version check (Function code 25)
1.4.7 ?One Push Demo? setting (Function code 28)
1.4.8 Operational check of sensors (Function code 32)
1.4.9 Not-disclosed-to-users functions (Function code 45)
1.4.10 Adjustment of color registration (Function code 66)
1.4.11 Continuous print test (Function code 67)
1.4.12 LED test pattern print (Function code 68)
1.4.13 Frame pattern print (Function code 69)
1.4.14 Color test pattern (Function code 71)
1.4.15 Sensitivity adjustment of density sensor (Function code 72)
1.4.16 Setting by country (Function code 74)
1.4.17 Sensitivity adjustment of registration mark sensor and check of belt surface (Function code 75)
1.4.18 Operational check of fans (Function code 78)
1.4.19 Display of the machine?s log (Function code 80)
1.4.20 Error code indication (Function code 82)
1.4.21 Developing bias voltage correction (Function code 83)
1.4.22 Exit from the maintenance mode (Function code 99)
2. OTHER SERVICE FUNCTIONS
2.1 Not-disclosed-to-users Function Menus Enabled by Pressing Button (s) When Turning the Machine On
2.2 Develop Roller Counter Reset Function
2.3 Parts Life Reset Function
2.4 Printout of Printer Settings
2.5 How to Recover from Errors of the Fuser Unit
2.6 Switching of Return Value of USB No./Support for Banding

CHAPTER 8: CIRCUIT DIAGRAMS & WIRING DIAGRAM
1. CIRCUIT DIAGRAMS
2. WIRING DIAGRAM

APPENDIX 1: WORKER SWITCH (WSW)
APPENDIX 2: DELETION OF USER SETTING INFORMATION etc.
APPENDIX 3: SERIAL NUMBERING SYSTEM
APPENDIX 4: SCREW CATALOGUE
APPENDIX 5: REFERENCES
APPENDIX 6: GLOSSARY

Numbers of pages: 434.