Brother MFCL3745CDW - User Manual

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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.

Table of Contents

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

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Summary

SAFETY INFORMATION

CHAPTER 2 ERROR INDICATION AND TROUBLESHOOTING

3. ERROR INDICATIONS

List of error codes, their descriptions, and references for troubleshooting.

4. TROUBLESHOOTING

Detailed troubleshooting steps for various common problems like paper feeding, image defects, and software issues.

CHAPTER 3 DISASSEMBLY;REASSEMBLY

1. SAFETY PRECAUTIONS

Crucial safety warnings and precautions to follow before disassembling the machine.

9. DISASSEMBLY PROCEDURE

Detailed step-by-step instructions for disassembling various machine parts.

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

Summary

SAFETY INFORMATION

CHAPTER 2 ERROR INDICATION AND TROUBLESHOOTING

3. ERROR INDICATIONS

List of error codes, their descriptions, and references for troubleshooting.

4. TROUBLESHOOTING

Detailed troubleshooting steps for various common problems like paper feeding, image defects, and software issues.

CHAPTER 3 DISASSEMBLY;REASSEMBLY

1. SAFETY PRECAUTIONS

Crucial safety warnings and precautions to follow before disassembling the machine.

9. DISASSEMBLY PROCEDURE

Detailed step-by-step instructions for disassembling various machine parts.

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

Brother MFCL3745CDW Specifications

General

Brand	Brother
Model	MFCL3745CDW
Category	Printer
Language	English

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