Brother MFCL3745CDW User Manual (English)

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Confidential

MODEL

March 2018

SM-FAX191

8CE7*

Ver.1

Brother Laser MFC

SERVICE MANUAL

DCP-9030CDN/L3510CDW/L3517CDW

DCP-L3550CDW/L3551CDW

HL-L3290CDW

MFC-9150CDN/9350CDW

MFC-L3710CW/L3730CDN/L3735CDN

MFC-L3745CDW/L3750CDW/L3770CDW

Read this manual thoroughly before maintenance work.

Keep this manual in a convenient place for quick and easy reference at all times.

Default Chapter3
- Table of Contents3
Safety Information11
Chapter 1 Supplemental Specifications18
General18
Network Connectivity24
Service Information24
Supplies25
Media Specifications30
Fax (Only for the Models with Fax Function)34
Copy35
Scanner36
Chapter 2 Error Indication and Troubleshooting37
Introduction37
- Precautions37
- Checks before Commencing Troubleshooting39
Overview41
- Cross-Section Drawing41
  - Printer Part41
  - Scanner Part43
- Paper Feeding44
  - Printer Part44
  - Scanner Part46
- Operation of each Part and Location of Parts47
- Block Diagram51
- Main Components52
Error Indications53
- Error Codes53
- Error Message62
  - Non Touch Panel Models62
  - Touch Panel Models78
- Communication Errors94
Troubleshooting98
- Error Cause and Remedy98
- Troubleshooting for Paper Feeding Problems142
- Troubleshooting for Image Defects152
  - Image Defect Examples152
  - Troubleshooting Image Defect153
- Troubleshooting for Software Problems172
  - Unable to Receive Data172
- Troubleshooting for Network Problems173
  - Cannot Make a Print through Network Connection173
  - Cannot Connect to Access Point173
- Troubleshooting for Control Panel Problems174
- Troubleshooting for Toner Cartridge and Drum Unit Problems176
- Troubleshooting for Fuser Unit Problems178
  - Fuser Unit Failure178
- Troubleshooting for LED ASSY Problems178
  - LED ASSY Failure178
- Troubleshooting for PCB Problems179
  - Main PCB Failure179
  - Full Memory179
- Troubleshooting for Document Feeding Problems180
- Troubleshooting for Image Defects183
  - Defect Examples183
  - Troubleshooting According to Image Defect183
- Troubleshooting for Fax Problems188
- Troubleshooting for Other Problems190
Chapter 3 Disassembly/Reassembly192
Safety Precautions192
Packing193
Screw Catalogue194
Screw Torque List195
Lubrication197
Overview of Gears199
Harness Routing200
Disassembly Flow217
Disassembly Procedure218
- Preparation218
- Paper Tray / T1 Separation Pad ASSY219
- Back Cover220
- Rear Flapper Sub ASSY222
- Fuser Cover ASSY / Fuser Unit223
- Cord Hook228
- Side Cover L229
- Side Cover R230
- Back Cover Lower231
- Document Scanner Unit232
- ADF Unit (for Models with ADF)235
  - ADF Unit235
  - Document Separation Roller ASSY238
  - ADF Separation Holder ASSY240
  - Second Side CIS Unit / Second Side CIS Flat Cable (Only for Models with Duplex Scanning)241
  - Document Detection Sensor PCB / Document Scanning Position Sensor PCB246
- Document Cover ASSY (for Models Without ADF)247
- Panel Unit249
  - Key PCB / Panel PCB / Touch Panel ASSY / LCD250
  - Panel PCB / LCD ASSY252
- Panel Flat Cable / First Side CIS Unit / First Side CIS Flat Cable254
- Modem Flat Cable / Modem PCB261
- Joint Cover ASSY262
- LED Unit265
- Speaker Unit267
- Nfc Pcb268
- LED Control Flat Cable / LED Control PCB270
- LED ASSY (Y/M/C/K) / LED ASSY Flat Cable (Y/M/C/K)273
- MP Paper Guide ASSY / MP Cover ASSY / USB Host PCB (Only for MP Models)276
- MP Roller Holder ASSY (Only for MP Models)280
- MP Unit (Only for MP Models)282
- Manual Feed Cover ASSY / USB Host PCB (Only for Manual Feed Models)283
- High-Voltage Power Supply PCB / Develop Release Sensor PCB285
- Fan288
- Wlan Pcb289
- Main PCB290
- Cartridge Sensor Relay Flat Cable292
- Develop Release Clutch / Process Drive Unit / High-Voltage Power Supply Flat Cable / Process Motor Flat Cable / Paper Feed Motor Flat Cable293
- T1 Pick-Up Clutch / Registration Clutch / Paper Feed Drive Unit302
- Eject Sensor PCB304
- Roller Holder ASSY305
- Paper Feed Unit306
- Paper Eject ASSY308
- Duplex Tray309
- Low-Voltage Power Supply PCB310
- Registration Mark Sensor L PCB / Registration Mark Sensor R PCB314
Chapter 4 Adjustments and Updating of Settings, Required after Parts Replacement316
If You Replace the Main Pcb316
- Configure for Country/Region and Model (Function Code 74)317
- Installing the Firmware (Sub Firmware and Main Firmware)317
  - Checking Firmware Version317
  - Installing Firmware318
- Initializing the EEPROM of the Main PCB (Function Code 01)320
- Adjusting Touch Panel (Function Code 61)320
- Continuous Adjustments of Density and Registration Sensor (Function Code 73)320
- Acquisition of White Level Data (Function Code 55)320
- Setting the Serial Number (Function Code 80)320
If You Replace the Registration Mark Sensor Assy or Led Assy323
- Continuous Adjustments of Density and Registration Sensor (Function Code 73)323
If You Replace the Low-Voltage Power Supply Pcb324
- Resetting Irregular Power Supply Counter of the Low-Voltage Power Supply PCB (Reset Counters for Consumable Parts (Function Code 88))324
If You Replace the Lcd, Panel Unit or Panel Pcb325
- Adjusting Touch Panel (Function Code 61) (Touch Panel Models Only)325
- Checking LCD Operation (Function Code 12)325
If You Replace the Adf Unit, First Side Cis Unit, Second Side Cis Unit or Document Scanner Unit326
- Acquisition of White Level Data (Function Code 55)326
- Scanning and Printing Check326
If You Replace the Fuser Unit327
- Resetting Printed Pages Counter of the Fuser Unit (Reset Counters for Consumable Parts (Function Code 88))327
If You Replace a Pf Kit328
- Resetting Printed Pages Counter of a PF Kit (Reset Counters for Consumable Parts (Function Code 88))328
Chapter 5 Service Functions329
Maintenance Mode329
- How to Enter Maintenance Mode329
  - Method of Entering Maintenance Mode for Service Personnel329
  - Method of Entering End-User Accessible Maintenance Mode330
- List of Maintenance Mode Functions331
- Details of Maintenance Mode Functions332
Other Service Functions411
- Change ON/OFF Setting of Color Registration411
- Print Communication Error List412
Chapter 6 Wiring Diagram413
- Wiring Diagram413
Chapter 7 Periodical Maintenance414
Precautions414
Periodical Replacement Parts415
- Preparation415
- Fuser Unit416
- PF Kit 1423
- PF Kit MP425

Brother MFCL3745CDW User Manual

Table of Contents

Brother MFCL3745CDW Specifications

Summary

SAFETY INFORMATION

CHAPTER 2 ERROR INDICATION AND TROUBLESHOOTING

3. ERROR INDICATIONS

4. TROUBLESHOOTING

CHAPTER 3 DISASSEMBLY/REASSEMBLY

1. SAFETY PRECAUTIONS

9. DISASSEMBLY PROCEDURE

9.11 ADF unit (For models with ADF)

9.13 Panel unit

CHAPTER 5 SERVICE FUNCTIONS

1. MAINTENANCE MODE

7. PERIODICAL MAINTENANCE

APPENDIX 3 INSTALLING THE MAINTENANCE PRINTER DRIVER

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Brand	Brother
Model	MFCL3745CDW
Category	Printer
Language	English