Brother Facsimile Equipment MFC7420 User Manual
Service manual
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Table of contents
Document Outline
- ALLFB SERVICE MANUAL
- PREFACE
- TABLE OF CONTENTS
- CHAPTER 1 PARTS NAMES & FUNCTIONS
- CHAPTER 2 SPECIFICATIONS
- CHAPTER 3 THEORY OF OPERATION
- CHAPTER 4 TRANSFER OF DATA LEFT IN THE MACHINE TO BE SENT FOR REPAIR
- CHAPTER 5 DISASSEMBLY/REASSEMBLY AND LUBRICATION
- 5.1 DISASSEMBLY/REASSEMBLY
- Safety Precautions
- Tightening Torque
- Preparation
- How to Access the Object Component
- Disassembly Flowchart
- 5.1.1 AC Cord
- 5.1.2 Drum/Toner ASSY
- 5.1.3 Paper Tray
- 5.1.4 Rear Cover
- 5.1.5 Rear Chute Cover
- 5.1.6 Side Cover L
- 5.1.7 Side Cover R
- 5.1.8 ADF unit
- 5.1.9 Pull Arm/Pull Arm Guide/Lock Claw Pull Arm Spring
- 5.1.10 Scanner Unit
- 5.1.11 Panel Unit
- 5.1.12 NCU PCB
- 5.1.13 Speaker
- 5.1.14 Joint Cover ASSY /Paper Stopper/Battery ASSY
- 5.1.15 Front Cover
- 5.1.16 Pickup Roller Holder ASSY
- 5.1.17 Fixing Unit
- 5.1.18 High-Voltage PS PCB ASSY
- 5.1.19 Main PCB
- 5.1.20 PS PCB Unit
- 5.1.21 Laser Unit
- 5.1.22 Sub Chute ASSY
- 5.1.23 Link Lever
- 5.1.24 Tail Edge Actuator
- 5.1.25 Regist Front Actuator/Regist Front Spring
- 5.1.26 Regist Sensor PCB ASSY
- 5.1.27 Regist Rear Actuator/Regist Rear Spring
- 5.1.28 Fan Motor 60 Unit
- 5.1.29 Toner LED PCB ASSY/LED Holder
- 5.1.30 New Toner Actuator/New Toner Actuator Spring
- 5.1.31 New Toner Sensor
- 5.1.32 Cover Sensor
- 5.1.33 Toner Sensor PCB ASSY
- 5.1.34 Main Motor ASSY
- 5.1.35 Develop Joint
- 5.1.36 P/R Solenoid ASSY
- 5.1.37 F/R Solenoid ASSY
- 5.1.38 Main Frame L
- 5.1.39 Main Frame R
- 5.1.40 Harness Routing
- 5.2 LUBRICATION
- 5.1 DISASSEMBLY/REASSEMBLY
- CHAPTER 6 ADJUSTMENTS AND UPDATING OF SETTINGS, REQUIRED AFTER PARTS REPLACEMENT
- 6.1 IF YOU REPLACE THE MAIN PCB
- [ 1 ] Load update programs/data
- [ 2 ] Initialize the EEPROM on the main PCB (Function code 01)
- [ 3 ] Customize the EEPROM on the main PCB (Function code 74)
- [ 4 ] Check the control panel PCB for normal operation (Function code 13)
- [ 5 ] Make a sensor operation check (Function code 32)
- [ 6 ] Acquire of white level data and set the CIS scanner area (Function code 55)
- [ 7 ] Setting the serial number
- [ 8 ] Inputting the adjusted value of the laser scanner
- [ 9 ] Switch back to standby
- 6.1 IF YOU REPLACE THE MAIN PCB
- CHAPTER 7 CLEANING
- CHAPTER 8 MAINTENANCE MODE
- 8.1 ENTRY INTO THE MAINTENANCE MODE
- 8.2 LIST OF MAINTENANCE-MODE FUNCTIONS
- 8.3 USER-ACCESS TO THE MAINTENANCE MODE
- 8.4 DETAILED DESCRIPTION OF MAINTENANCE-MODE FUNCTIONS
- 8.4.1 EEPROM Parameter Initialization (Function code 01/91)
- 8.4.2 Printout of Scanning Compensation Data (Function code 05)
- 8.4.3 Placement of CIS Unit in Position for Transportation (Function code 06)
- 8.4.4 ADF Performance Test (Function code 08)
- 8.4.5 Test Pattern 1 (Function code 09)
- 8.4.6 Firmware Switch Setting and Printout
- 8.4.7 Operation Check of LCD (Function code 12)
- 8.4.8 Operational Check of Control Panel PCB (Function code 13)
- 8.4.9 Sensor Operational Check (Function code 32)
- 8.4.10 Received Data Transfer Function (Function code 53) (MFC7420/7820N only)
- 8.4.11 Fine Adjustment of Scan Start/End Positions (Function code 54)
- 8.4.12 Acquisition of White Level Data and CIS Scanner Area Setting (Function code 55)
- 8.4.13 Paper Feeding and Ejecting Test (Function code 67)
- 8.4.14 EEPROM Customizing (Function code 74)
- 8.4.15 Display of the Equipment’s Log Information (Function code 80)
- 8.4.16 Machine Error Code Indication (Function code 82)
- 8.4.17 Output of Transmission Log to the Telephone Line (Function code 87)
- 8.4.18 Cancellation of the Memory Security Mode (Not applicable to the Japanese model)
- CHAPTER 9 ERROR INDICATION AND TROUBLESHOOTING
- APPENDIX 1. SERIAL NUMBERING SYSTEM
- APPENDIX 2. FIRMWARE INSTALLATION
- APPENDIX 3. CUSTOMIZING CODES ACCORDING TO SHIPPING DESTINATION
- APPENDIX 4. FIRMWARE SWITCHES (WSW)
- APPENDIX 5. WIRING DIAGRAM
- APPENDIX 6. CIRCUIT DIAGRAMS