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3-11

Confidential

3 Left side of the machine

Harness colors are subject to change for some reason.

Flat cable sponge

Flat core

Laser unit flat cable

New toner sensor PCB ASSY

New toner sensor PCB flat cable

Paper feed

sensor harness

ASSY

(WH, BL, RD)

Guide

Registration

clutch harness

(WH)

T1 clutch

harness (BL)

T1 clutch

Guides

Registration clutch

Guide

Main motor flat cableMain PCB ASSY

HVPS flat cable

Guides

LVPS harness (WH, BR)

Guides

Hole

Guides

Eject sensor PCB flat cable

Eject sensor PCB ASSY

<Rear side of

the main PCB>

Hole

Hook harness (BK)

Back cover/duplex

tray sensor harness

(RD, BL)

Back cover/

duplex tray

sensor

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

Brand	Brother
Model	MFC-7380
Category	All in One Printer
Language	English

Brother MFC-7380 User Manual

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