Brother MFC-7380

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3-10

Confidential

2 Top side of the registration chute

Harness colors are subject to change for some reason.

Registration front/rear sensor PCB harness (RD, BL, WH, BK)

LVPS harness (WH, BR)

Guides

Registration front/rear sensor PCB ASSY

Registration chute

Hole

Hole

Top side

Table of Contents

Default Chapter1
- Service Manual1
- Open Source Licensing Remarks3
- Other Information3
- Table of Contents4
Regulation10
Safety Information17
- Additional Information22
Chapter 1 Supplemental Specifications25
General25
Network Connectivity29
Service Information30
Supplies31
Media Specifications33
Fax (Only for the Models with Fax Function)33
Copy34
Scanner35
Chapter 2 Error Indications & Troubleshooting36
Introduction36
- Precautions36
- Checks before Commencing Troubleshooting37
Overview39
- Cross-Section Drawing39
  - Printer Part39
  - Scanner Part40
- Paper Feeding41
  - Printer Part41
  - Scanner Part42
- Operation of each Part43
- Block Diagram44
- Main Components45
Error Indications46
- Error Codes47
- Error Messages54
  - 2-Line Display LCD Models54
  - Touch Panel Models58
- Communication Errors62
Troubleshooting66
- Error Cause and Remedy66
- Troubleshooting for Paper Feeding Problems93
- Troubleshooting for Image Defects101
  - Image Defect Examples101
  - Troubleshooting According to Image Defect102
- Troubleshooting for Software Problems113
  - Cannot Receive Data113
- Troubleshooting for Network Problems114
  - Cannot Print Via Network Connection114
  - Cannot Connect to Access Point114
- Troubleshooting for Control Panel Problems115
- Troubleshooting for Toner and Drum Problems117
- Troubleshooting for Fuser Unit Problems119
  - Fuser Unit Failure119
- Troubleshooting for Laser Unit Problems119
  - Laser Unit Failure119
- Troubleshooting for PCB Problems120
- Troubleshooting for Document Feeding Problems121
- Troubleshooting for Image Defects124
- Troubleshooting for Fax Problems129
- Troubleshooting for Other Problems132
Chapter 3 Disassembly/Reassembly134
Safety Precautions134
Packing135
Screw Catalogue136
Screw Torque List137
Lubrication139
Overview of Gears140
Harness Routing142
Disassembly Flow Chart155
Disassembly Procedure156
- Preparation156
- Cord Hook158
- Back Cover159
- Outer Chute ASSY160
- Front Cover ASSY, Support Flap161
- Side Cover R162
- Fuser Cover163
- Inner Chute ASSY164
- Side Cover L, Handset Holder ASSY (for Models with Handset)165
- Pull Arm L, Pull Arm R, Pull Arm Spring167
- Document Scanner Unit168
- ADF Unit (for Models with ADF)170
  - ADF Unit170
  - Hinge ASSY L, Hinge R, Hinge R Support, Hinge Arm R172
  - ADF Document Output Support Flap, ADF Document Support173
  - ADF Cover ASSY, Gear Cover174
  - Document Separate Roller ASSY175
  - ADF Separation Pad Holder ASSY176
  - CIS Spacer, Second Side CIS Unit (Duplex Scanning Models Only)177
  - Document Feed Roller ASSY 1179
  - FFC Holder ASSY, Second Side CIS Flat Cable, ADF Motor183
  - 10First Side Document Scanning Position Sensor PCB ASSY, Second Side Document Scanning Position Sensor PCB ASSY (Duplex Scanning Models Only), ADF Cover/Document Detection Sensor PCB ASSY188
- Document Cover ASSY (for Models Without ADF)189
- Panel Unit (for Models with Touch Panel)191
  - Panel Unit191
  - Panel PCB ASSY, LCD192
  - Touch Panel ASSY193
- Panel Unit (for Models Without Touch Panel)194
  - Panel Unit194
  - Panel PCB ASSY195
  - Lcd196
- First Side CIS Unit, First Side CIS Flat Cable197
- Lock Claw, Pull Arm Guide203
- Modem PCB ASSY204
- Speaker Unit206
- Joint Cover ASSY207
- Fuser Unit208
- Low-Voltage Power Supply PCB ASSY210
- Fan212
- High-Voltage Power Supply PCB ASSY213
- Filter215
- Laser Unit216
- Wireless LAN PCB (Wireless Network Models Only)218
- Roller Holder ASSY219
- Main PCB ASSY220
- T1 Clutch and Registration Clutch221
- New Toner Sensor PCB ASSY222
- Main Frame L ASSY223
- Main Motor225
- Fuser Gear 67R/40R227
- Eject Sensor PCB ASSY228
- Registration Front/Rear Actuator Holder ASSY230
Chapter 4 Adjusting and Updating Settings as Required after Parts Replacement233
If You Replace the Main Pcb Assy233
- Setting by Spec (Function Code: 74)234
- Initializing the EEPROM of the Main PCB ASSY (Function Code: 01)235
- Setting Serial Number and Entering Adjusted Value of Laser Unit236
- Acquiring White Level Data (Function Code: 55)237
- Adjusting Touch Panel (Function Code: 61) (Touch Panel Models Only)237
If You Replace the Low-Voltage Power Supply Pcb Assy238
- Reset Irregular Power Supply Detection Counter of the Low-Voltage Power Supply PCB (Function Code: 88)238
If You Replace the Laser Unit239
- Entering Adjusted Value of Laser Unit240
If You Replace the Panel Unit or Panel Pcb Unit241
- Installing Firmware (Touch Panel Models Only)242
  - Checking Firmware Version242
  - Installing Firmware242
- Adjusting Touch Panel (Function Code: 61) (Touch Panel Models Only)242
- Checking LCD Operation (Function Code: 12)242
If You Replace the First Side Cis Unit or Document Scanner Unit243
- Acquiring White Level Data (Function Code: 55)243
- Scanning and Printing Check243
If You Replace the Adf Unit or Second Side Cis Unit244
- Acquiring White Level Data (Function Code: 55) (Duplex Scanning Models Only)244
- Scanning and Printing Check244
Chapter 5 Service Functions245
Function Code245
- How to Enter Maintenance Mode245
  - Method of Entering Maintenance Mode for Service Personnel245
  - Method of Entering End-User Accessible Maintenance Mode246
- List of Maintenance Mode Functions247
- Details of Maintenance Mode Functions248
Other Service Functions297
- Print Communication Error List297
Chapter 6 Wiring Diagram298
Chapter 7 Periodical Maintenance299
Periodical Replacement Parts299
Appendix 1 Serial Numbering System300
Appendix 2 Deleting User Setting Information301
Appendix 3 Installing the Maintenance Printer Driver302

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