Brother DCP7010 - Appendix 6: Circuit Diagrams; A. NCU PCB: MFC7420 (U.S.A. and CANADA models)

Brother DCP7010

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A. NCU PCB: MFC7420

(U.S.A. and CANADA models)

Confidential

Table of Contents

Default Chapter5
- Table of Contents5
- Safety Precautions11
- Choosing a Location13
Chapter 1 Parts Names & Functions14
Equipment Outline16
Control Panel17
Components19
Chapter 2 Specifications20
- Specifications List21
- General Specifications22
- Paper Specifications23
- Printable Area25
Specifications List29
Chapter 3 Theory of Operation44
Overview46
Mechanical Components47
- Scanner Mechanism48
- Printing Mechanism51
- Sensors and Actuators63
Chapter 4 Transfer of Data Left in the Machine to be Sent for Repair67
Transferring Received Fax Data67
Chapter 5 Disassembly/Reassembly and Lubrication69
- Components70
Disassembly/Reassembly72
- Safety Precautions72
- Tightening Torque73
- Preparation74
- How to Access the Object Component74
- Disassembly Flowchart75
- AC Cord76
- Drum/Toner ASSY76
- Paper Tray77
- Rear Cover78
- Rear Chute Cover79
- Side Cover L80
- Side Cover R81
- ADF Unit82
- Pull Arm/Pull Arm Guide/Lock Claw Pull Arm Spring96
- Scanner Unit97
- Panel Unit97
- Ncu Pcb101
- Speaker102
- Joint Cover Assy/Paper Stopper/Battery ASSY104
- Front Cover107
- Pickup Roller Holder ASSY109
- Fixing Unit113
- High-Voltage PS PCB ASSY119
- Main PCB120
- PS PCB Unit124
- Laser Unit125
- Sub Chute ASSY127
- Link Lever128
- Tail Edge Actuator129
- Regist Front Actuator/Regist Front Spring129
- Regist Sensor PCB ASSY130
- Regist Rear Actuator/Regist Rear Spring130
- Fan Motor 60 Unit131
- Toner LED PCB ASSY/LED Holder132
- New Toner Actuator/New Toner Actuator Spring133
- New Toner Sensor133
- Cover Sensor134
- Toner Sensor PCB ASSY134
- Main Motor ASSY135
- Develop Joint136
- P/R Solenoid ASSY136
- F/R Solenoid ASSY137
- Main Frame L139
- Main Frame R140
- Harness Routing141
- Speaker Assy148
Lubrication149
Chapter 6 Adjustments and Updating of Settings, Required after Parts Replacement150
- If You Replace the Main Pcb151
If You Replace the Main Pcb152
- 1 ] Load Update Programs/Data152
- 2 ] Initialize the EEPROM on the Main PCB (Function Code 01)152
- 3 ] Customize the EEPROM on the Main PCB (Function Code 74)152
- 4 ] Check the Control Panel PCB for Normal Operation (Function Code 13)152
- 5 ] Make a Sensor Operation Check (Function Code 32)152
- Acquire of White Level Data and Set the CIS Scanner Area (Function Code 55)152
- 7 ] Setting the Serial Number152
- 8 ] Inputting the Adjusted Value of the Laser Scanner152
- 9 ] Switch Back to Standby152
Chapter 7 Cleaning156
Chapter 8 Maintenance Mode156
- Entry into the Maintenance Mode157
Entry into the Maintenance Mode158
List of Maintenance-Mode Functions159
List of Maintenance Mode Functions159
User-Access to the Maintenance Mode160
Detailed Description of Maintenance-Mode Functions162
- EEPROM Parameter Initialization (Function Code 01/91)162
- Printout of Scanning Compensation Data (Function Code 05)163
- Placement of CIS Unit in Position for Transportation (Function Mode 06)165
- ADF Performance Test (Function Mode 08)166
- Test Pattern 1 (Function Mode 09)167
- Firmware Switch Setting and Printout168
  - Printout of Firmware Switch Data (Function Mode 11)171
  - (MFC7420/7820N Only)171
- Operational Check of Control Panel PCB (Function Mode 13)174
- Sensor Operational Check (Function Mode 32)175
- Received Data Transfer Function (Function Mode 53)177
- Fine Adjustment of Scan Start/End Positions (Function Mode 54)179
- Acquisition of White Level Data and CIS Scanner Area Setting181
- Paper Feeding and Ejecting Test (Function Mode 67)181
- EEPROM Customizing (Function Mode 74)182
- Display of the Equipment's Log Information (Function Mode 80)183
- Machine Error Code Indication (Function Mode 82)185
- Output of Transmission Log to the Telephone Line (Function Mode 87)185
- Cancellation of the Memory Security Mode (Not Applicable to the Japanese Model)186
Detailed Description of Maintenance Mode Functions162
Chapter 9 Error Indication and Troubleshooting187
Error Indication189
- Equipment Errors189
  - 1 ] Error Messages Appearing on the LCD189
  - 2 ] Error Codes Shown in the "MACHINE ERROR X X" Messages193
- Communications Errors199
Troubleshooting203
- Introduction203
- Precautions203
- Checking Prior to Troubleshooting203
- Troubleshooting Based on Problem Type204
Appendix 1 Serial Numbering System248
Appendix 2 Firmware Installation251
A2.1 Installing the Update Data to the Machine252
A2.2 Setting ID Codes to Machines260
Appendix 3 Customizing Codes According to Shipping Destination261

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