Document Outline

• ALLFB SERVICE MANUAL
  • PREFACE
  • TABLE OF CONTENTS
    • CHAPTER 1 PARTS NAMES & FUNCTIONS
      • 1.1 EQUIPMENT OUTLINE
      • 1.2 CONTROL PANEL
      • 1.3 COMPONENTS
    • CHAPTER 2 SPECIFICATIONS
      • 2.1 GENERAL
        • 2.1.1 General Specifications
        • 2.1.2 Paper Specifications
        • 2.1.3 Printable Area
      • 2.2 SPECIFICATIONS LIST
    • CHAPTER 3 THEORY OF OPERATION
      • 3.1 OVERVIEW
      • 3.2 MECHANICAL COMPONENTS
        • 3.2.1 Scanner Mechanism
        • 3.2.2 Printing Mechanism
          • 3.2.2.1 Paper supply
          • 3.2.2.2 Push-up function of paper tray
          • 3.2.2.3 Paper registration
          • 3.2.2.4 Paper eject
          • 3.2.2.5 Drum unit
          • 3.2.2.6 Toner cartridge
          • 3.2.2.7 Print process
        • 3.2.3 Sensors and Actuators
      • 3.3 CONTROL ELECTRONICS
        • 3.3.1 Components
    • CHAPTER 4 TRANSFER OF DATA LEFT IN THE MACHINE TO BE SENT FOR REPAIR
      • 4.1 TRANSFERRING RECEIVED FAX DATA
    • 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
    • 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
    • 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
          • 8.4.6.1 Firmware switch setting (Function code 10)
          • 8.4.6.2 Printout of firmware switch data (Function code 11)
        • 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
      • 9.1 ERROR INDICATION
        • 9.1.1 Equipment Errors
          • [ 1 ] Error messages appearing on the LCD
          • [ 2 ] Error codes shown in the "MACHINE ERROR X X" message
        • 9.1.2 Communications Errors
      • 9.2 TROUBLESHOOTING
        • 9.2.1 Introduction
        • 9.2.2 Precautions
        • 9.2.3 Checking Prior to Troubleshooting
        • 9.2.4 Troubleshooting Based on Problem Type
          • [ 1 ] Paper feeding problems
          • [ 2 ] Software setting problems
          • [ 3 ] Malfunction
          • [ 4 ] Image defects
          • [ 5 ] Incorrect printout
          • [ 6 ] Network problem
          • [ 7 ] Troubleshooting of the control panel
          • [ 8 ] Troubleshooting of fax functions F-1
    • APPENDIX 1. SERIAL NUMBERING SYSTEM
    • APPENDIX 2. FIRMWARE INSTALLATION
      • A2.1 INSTALLING THE UPDATE DATA TO THE MACHINE
      • A2.2 SETTING ID CODES TO MACHINES
    • APPENDIX 3. CUSTOMIZING CODES ACCORDING TO SHIPPING DESTINATION
    • APPENDIX 4. FIRMWARE SWITCHES (WSW)
    • APPENDIX 5. WIRING DIAGRAM
    • APPENDIX 6. CIRCUIT DIAGRAMS
      • A. NCU PCB: MFC7420 (U.S.A. and CANADA models)
      • A. NCU PCB: MFC7820N (U.S.A. and CANADA models)
      • A. NCU PCB: MFC7420 (EUROPE models)
      • A. NCU PCB: MFC7820N (EUROPE models)
      • B. Power Supply PCB 100C (U.S.A. and CANADA models)
      • B. Power Supply PCB 200V (EUROPE models)