Brother DCP-L8400CDN DCP-L8450CDW MFC-L8600CDW MFC-L8650CDW MFC-L8850CDW MFC-L9550CDW Service Manual and Parts List Manual

Service Manual and Parts List Manual Brother DCP-L8400CDN DCP-L8450CDW MFC-L8600CDW MFC-L8650CDW MFC-L8850CDW MFC-L9550CDW;
This manual is in the PDF format and have detailed Diagrams, pictures and full procedures to diagnose and repair your Brother.
You can print, zoom or read any diagram, picture or page from this Service Manual and Parts List 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 DCP-L8400CDN DCP-L8450CDW MFC-L8600CDW MFC-L8650CDW MFC-L8850CDW MFC-L9550CDW. You can find easily everything what do you need.
To see what contain, please read table of contents:

Content for Service Manual:
SAFETY INFORMATION
CHAPTER 1. SUPPLEMENTAL SPECIFICATIONS
1.1 General
1.2 Network Connectivity
1.3 Service Information
1.4 Supplies
1.5 Paper
1.5.1 Media specifications for ADF
1.6 Telephone
1.7 FAX (Only for the models with FAX function)
1.8 Copy
1.9 Scanner

CHAPTER 2. ERROR INDICATION AND TROUBLESHOOTING
1. INTRODUCTION
1.1 Precautions
1.2 Checks before Commencing Troubleshooting
2. OVERVIEW
2.1 Cross-section Drawing
2.1.1 Printer part
2.1.2 Scanning part
2.2 Paper Feeding
2.2.1 Printer part
2.2.2 Scanning part
2.3 Operation of Each Part
2.4 Block Diagram
2.5 Main Components
3. ERROR INDICATIONS
3.1 Error Codes
3.2 Error Message
Confidential
3.3 Communications Error Code
4. TROUBLESHOOTING
4.1 Error Cause and Remedy
4.2 Troubleshooting for Paper Feeding Problems
4.2.1 No paper feeding from paper tray 1
4.2.2 No paper feeding from T2 paper tray unit
4.2.3 No paper feeding from MP tray
4.2.4 Multiple sheets of paper are fed
4.2.5 Paper becomes wrinkled
4.2.6 Paper is fed at an angle
4.2.7 Paper curls
4.2.8 Unable to perform 2-sided printing
4.2.9 Paper jam
4.3 Troubleshooting for Image Defects
4.3.1 Image defect examples
4.3.2 Troubleshooting image defect
4.4 Troubleshooting for Software Problems
4.4.1 Unable to receive data
4.5 Troubleshooting for Network Problems
4.5.1 Cannot make a print through network connection
4.6 Troubleshooting for Control Panel Problems
4.6.1 Nothing is displayed on the LCD
4.6.2 Unable to perform panel operation
4.7 Troubleshooting for Toner Cartridge and Drum Unit Problems
4.7.1 New toner not detected
4.7.2 Toner cartridge not detected
4.7.3 Toner replacement message displayed on LCD is not cleared
4.7.4 Drum error
4.7.5 Drum replacement message displayed on LCD is not cleared
4.8 Troubleshooting for Fuser Unit Problems
4.8.1 Fuser unit failure
4.9 Troubleshooting for Laser Unit Problems
4.9.1 Laser unit failure
4.10 Troubleshooting for PCB Problems
4.10.1 Main PCB failure
4.10.2 Full memory
4.10.3 Problem of print restriction/ID authentication
4.11 Document Feeding Problems
4.11.1 No feeding
4.11.2 Double feeding
4.11.3 Paper jam
4.11.4 Document becomes wrinkled
4.11.5 Document size cannot be correctly detected
4.12 Scanning Image Defect Troubleshooting
4.12.1 Image defect examples
4.12.2 Troubleshooting image defect
4.13 Troubleshooting of FAX Functions
4.13.1 FAX can’t send it
4.13.2 FAX cannot be received
4.13.3 No bell ring
4.13.4 A communication error occurs
4.13.5 Receive buffer full during receiving into memory
4.14 Troubleshooting for Other Problems
4.14.1 Cannot make print
4.14.2 Problem of USB direct interface
4.14.3 Cannot update firmware
4.14.4 The machine is not turned ON

CHAPTER 3. DISASSEMBLY AND ASSEMBLY
1. SAFETY PRECAUTIONS
2. PACKING
3. SCREW CATALOGUE
4. SCREW TORQUE LIST
5. LUBRICATION
6. OVERVIEW OF GEARS
7. HARNESS ROUTING
8. DISASSEMBLY FLOW
9. DISASSEMBLY PROCEDURE
9.1 Lift Gear 46/Gear Z19M10
9.2 Back Cover/Back Cover Stopper Arm L/Back Cover Stopper Arm R
9.3 Fuser Cover ASSY
9.4 Cleaner Pinch Roller S ASSY
9.5 Fuser Unit
9.6 Cord Hook
9.7 Side Cover L
9.8 Side Cover R
9.9 Duplex Tray
9.10 MP Cover ASSY/MP Paper Guide ASSY
9.11 MP Link L/MP Link R
9.12 Front Cover
9.13 Front Cover Release Button/Front Cover Release Button Spring
9.14 Support Flap
9.15 Pull Arm L/Pull Arm R (A4 Model Only)
9.16 Back Cover Upper (Legal Model Only)
9.17 ADF Unit/Hinge ASSY L/Hinge R/Hinge R Support
9.18 ADF Document Output Support Flap
9.19 ADF Document Support
9.20 ADF Cover ASSY
9.21 Gear Cover
9.22 Separation Roller
9.23 ADF Separation Pad Holder (A4 Model Only)
9.24 ADF Separation Pad/Separation Support Film (Legal Model Only)
9.25 ADF Separation Spring Holder (Legal Model Only)
9.26 CIS Spacer
9.27 Second Side CIS Flat Cable/Second Side CIS Unit
9.28 ADF Cover/Document Detection Sensor PCB ASSY/
First Side Document Scanning Position Sensor PCB ASSY/
Second Side Document Scanning Position Sensor PCB ASSY (Duplex Scanning Model Only)
9.29 Document Feed Roller ASSY 2
9.30 Eject Film
9.31 ADF Motor
9.32 Document Cover ASSY
9.33 Control Panel ASSY/Document Scanner Unit
9.34 Panel PCB Unit
9.35 LCD
9.36 Touch Panel ASSY
9.37 NFC PCB ASSY (Model with NFC only)/Panel Cover ASSY
9.38 First Side CIS Unit/First Side CIS Flat Cable
9.39 Joint Film (A4 Model Only)
9.40 Joint Film2 (Single-side Scanning Model Only)
9.41 Joint Cover Top
9.42 Modem PCB ASSY/Modem Flat Cable
9.43 Back Cover Upper (A4 Model Only)
9.44 Joint Cover USB ASSY
9.45 Wireless LAN PCB
9.46 Main PCB ASSY
9.47 Laser Unit Flat Cable/Laser Unit
9.48 Front Cover Sensor
9.49 Process Drive Unit/Fuser Drive Gear Z25
9.50 Main Drive Unit
9.51 Develop Release Drive Unit
9.52 Develop Release Sensor PCB ASSY
9.53 Toner/New Sensor PCB ASSY
9.54 Fuser Fan
9.55 Paper Eject ASSY
9.56 Toner Filter ASSY
9.57 Paper Eject Origin Sensor
9.58 Back Cover Sensor ASSY
9.59 Eject Sensor PCB ASSY
9.60 Registration Mark Sensor Unit
9.61 Power Fan
9.62 Low-voltage Power Supply PCB Unit
9.63 MP Paper Empty Actuator A ASSY/MP Paper Empty Actuator B
9.64 MP Paper Empty/Registration Front Sensor PCB ASSY
9.65 Paper Feed Unit/Joint Pin
9.66 Registration Front/Rear Sensor PCB ASSY
9.67 T1 Paper Feed Sensor PCB ASSY
9.68 High-voltage Power Supply PCB ASSY
9.69 Air Duct Film
9.70 Blower
10. DISASSEMBLY PROCEDURE (LT-320CL/LT-325CL)
10.1 T2 Paper Tray Unit
10.2 T2 Cover Rear
10.3 T2 Cover Left
10.4 T2 Cover Right
10.5 T2 Relay PCB ASSY
10.6 T2 Paper Feed Frame Unit/T2 Edge Actuator

CHAPTER 4. ADJUSTMENTS AND UPDATING OF SETTINGS, REQUIRED AFTER PARTS REPLACEMENT
1. IF YOU REPLACE THE MAIN PCB ASSY
1.1 Installing the Firmware (Sub Firmware, Panel Firmware, Main Firmware, and High-voltage Firmware)
1.1.1 Checking firmware version
1.1.2 Installing the firmware
1.2 Initializing the EEPROM of the Main PCB ASSY (Function code 01)
1.3 Setting the Serial Number (Function code 80)
1.4 Restore Machine Information (Function code 41)
1.5 Setting by Country (Function code 74)
1.6 Motor Reset (Function code 57)
1.7 Continuous Adjustments of Density and Registration Sensor (Function code 73)
1.8 Acquisition of White Level Data (Function code 55)
1.9 Adjustment of Touch Panel (Function code 61)
2. IF YOU REPLACE THE REGISTRATION MARK SENSOR UNIT
2.1 Continuous Adjustments of Density and Registration Sensor (Function code 73)
3. IF YOU REPLACE THE LOW-VOLTAGE POWER SUPPLY PCB UNIT
3.1 Reset of Irregular Power Supply Detection Counter of Low-Voltage Power Supply PCB (Reset Counters for Parts (Function code 88))
4. IF YOU REPLACE THE PROCESS DRIVE UNIT
4.1 Motor Reset (Function code 57)
5. IF YOU REPLACE THE HIGH-VOLTAGE POWER SUPPLY PCB ASSY
5.1 Installing the Firmware
5.1.1 Checking firmware version
5.1.2 Installing the firmware
5.2 Continuous Adjustments of Density and Registration Sensor (Function code 73)
6. IF YOU REPLACE THE LCD PANEL ASSY OR PANEL CONTROL PCB ASSY
6.1 Installing the Firmware
6.1.1 Checking firmware version
6.1.2 Installing the firmware
6.2 Adjustment of Touch Panel (Function code 61)
6.3 Operational Check of LCD (Function code 12)
7. IF YOU REPLACE THE LASER UNIT
7.1 Continuous Adjustments of Density and Registration Sensor (Function code 73)
7.2 Counter Reset of Laser Unit (Reset Counters for Parts (Function code 88))
8. IF YOU REPLACE THE FIRST SIDE CIS UNIT, DOCUMENT SCANNER UNIT
8.1 Acquisition of White Level Data (Function code 55)
8.2 Scanning and Printing Check
9. IF YOU REPLACE THE ADF UNIT, SECOND SIDE CIS UNIT
9.1 Acquisition of White Level Data (Function code 55) (Duplex Scanning Model Only)
9.2 Scanning and Printing Check
10. IF YOU REPLACE THE FUSER UNIT/PF KIT 1, 2, AND MP
10.1 Counter Reset of Fuser Unit or PF Kit 1, 2, and MP (Reset Counters for Parts (Function code 88))

CHAPTER 5. SERVICE FUNCTIONS
1. MAINTENANCE MODE
1.1 How to Enter the Maintenance Mode
1.1.1 How to Enter the Maintenance Mode Exclusive to Service Personnel
1.1.2 How to Enter the End User-accessible Maintenance Mode
1.2 List of Maintenance-mode Functions
1.3 Detailed Description of Maintenance-mode Functions
1.3.1 EEPROM parameter initialization (Function code 01, 91)
1.3.2 Printout of scanning compensation data (Function code 05)
1.3.3 ADF performance test (Function code 08)
1.3.4 Monochrome image quality test pattern (Function code 09)
1.3.5 Worker switch (WSW) setting and printout (Function code 10, 11)
1.3.6 Operational check of LCD (Function code 12)
1.3.7 Operational check of control panel key (Function code 13)
1.3.8 Software version check (Function code 25)
1.3.9 “One Push Demo” setting (Function code 28)
1.3.10 Operational check of sensors (Function code 32)
1.3.11 LAN connection status display (Function code 33)
1.3.12 EEPROM Dump Print (Function code 40)
1.3.13 Backup of machine information (Function code 41)
1.3.14 PC print function setting (Function code 43)
1.3.15 Changing return value of USB No./Switching Dither Pattern/
Switching of ON/OFF of DirectPrint Color mode-Improve Gray Color/
Switching of timing to execute Auto Registration/
Adjusting left-end print start position on second side in duplex printing/
Change of the transfer current setting/Change of ghost reduction setting
(Function code 45)
1.3.16 Set country/language (Function code 52)
1.3.17 Transfer of received fax data and log information (Function code 53)
1.3.18 Fine adjustment of scan positions (Function code 54)
1.3.19 Acquisition of white level data and setting of CIS scanning area (Function code 55)
1.3.20 Motor reset (Function code 57)
1.3.21 Adjustment of touch panel (Function code 61)
1.3.22 Adjustment of color registration (Adjustment of inter-color position alignment) (Function code 66)
1.3.23 Continuous print test (Function code 67)
1.3.24 Laser unit test pattern print (Function code 68)
1.3.25 Frame pattern print (One-sided) (Function code 69)
1.3.26 Frame pattern print (Two-sided) (Function code 70)
1.3.27 Color test pattern (Function code 71)
1.3.28 Sensitivity adjustment of density sensor (Function code 72)
1.3.29 Continuous adjustments of density and registration sensor (Function code 73)
1.3.30 Setting by country (Function code 74)
1.3.31 Printout of maintenance information (Function code 77)
1.3.32 Operational check of fans (Function code 78)
1.3.33 Display of device log information (Function code 80)
1.3.34 Display of device error codes (Function code 82)
1.3.35 Developing bias voltage correction (Function code 83)
1.3.36 Sending of communication log information to telephone line (Function code 87)
1.3.37 Reset counters for parts (Function code 88)
1.3.38 Exit from the maintenance mode (Function code 99)
2. OTHER SERVICE FUNCTIONS
2.1 Printing of Communication List
2.2 Drum Cleaning
2.3 Counter Reset of Consumable Parts (Drum unit/Belt unit)

CHAPTER 6. WIRING DIAGRAM
1. WIRING DIAGRAM

CHAPTER 7. PERIODICAL MAINTENANCE
1. SAFETY PRECAUTIONS
2. PERIODICAL REPLACEMENT PARTS
2.1 Procedures to Replace Periodical Replacement Parts
2.1.1 Fuser unit
2.1.2 Laser unit
2.1.3 PF kit 1
2.1.4 PF kit 2
2.1.5 PF kit MP

APPENDIX 1 SERIAL NUMBERING SYSTEM
APPENDIX 2 DELETION OF USER SETTING INFORMATION
APPENDIX 3 INSTALLING THE MAINTENANCE PRINTER DRIVER

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Content for Parts List Manual:
1. FRAME
2. DRIVE
3. LASER UNIT
4. PAPER FEEDER
5. MP UNIT
6. DUPLEX
7. PAPER TRAY
8. FUSER UNIT
9. PAPER EJECT
10. COVERS & LABELS
11. DOCUMENT SCANNER
12. ADF
13. PANEL
14. PCB
15. ACCESSORIES
16. PRINTED MATERIALS
17. PACKING MATERIALS
18. PERIODICAL MAINTENANCE PARTS