Brother MFCL3750CDWL Manuals

Manuals and User Guides for Brother MFCL3750CDWL. We have 1 Brother MFCL3750CDWL manual available for free PDF download: Service Manual

Brother MFCL3750CDWL Service Manual (430 pages)

Brand: Brother | Category: Printer | Size: 29.45 MB

Table of Contents
3
Safety Information

11
Chapter 1 Supplemental Specifications

18
General

18
Network Connectivity

24
Service Information

24
Supplies

25
Media Specifications

30
Fax (Only for the Models with Fax Function)

34
Copy

35
Scanner

36
Chapter 2 Error Indication and Troubleshooting

37
Introduction

37
- Precautions
  37
- Checks before Commencing Troubleshooting
  39
Overview

41
- Cross-Section Drawing
  41
  - Printer Part
    41
  - Scanner Part
    43
- Paper Feeding
  44
  - Printer Part
    44
  - Scanner Part
    46
- Operation of each Part and Location of Parts
  47
- Block Diagram
  51
- Main Components
  52
Error Indications

53
- Error Codes
  53
- Error Message
  62
  - Non Touch Panel Models
    62
  - Touch Panel Models
    78
- Communication Errors
  94
Troubleshooting

98
- Error Cause and Remedy
  98
- Troubleshooting for Paper Feeding Problems
  142
  - No Paper Feeding from T1
    142
  - No Paper Feeding from MP Tray
    143
  - No Paper Feeding from Manual Feed Slot
    144
  - Multiple Sheets of Paper Are Fed
    144
  - Paper Becomes Wrinkled
    145
  - Paper Is Fed at an Angle
    145
  - Paper Curls
    145
  - Unable to Perform 2-Sided Printing
    146
  - Paper Jam
    147
- Troubleshooting for Image Defects
  152
  - Image Defect Examples
    152
  - Troubleshooting Image Defect
    153
- Troubleshooting for Software Problems
  172
  - Unable to Receive Data
    172
- Troubleshooting for Network Problems
  173
  - Cannot Make a Print through Network Connection
    173
  - Cannot Connect to Access Point
    173
- Troubleshooting for Control Panel Problems
  174
- Troubleshooting for Toner Cartridge and Drum Unit Problems
  176
- Troubleshooting for Fuser Unit Problems
  178
  - Fuser Unit Failure
    178
- Troubleshooting for LED ASSY Problems
  178
  - LED ASSY Failure
    178
- Troubleshooting for PCB Problems
  179
  - Main PCB Failure
    179
  - Full Memory
    179
- Troubleshooting for Document Feeding Problems
  180
  - No Document Is Fed
    180
  - Multiple Documents Are Fed
    180
  - Document Jam
    181
  - Document Becomes Wrinkled
    182
  - Document Size Is Not Detected Correctly
    182
- Troubleshooting for Image Defects
  183
  - Defect Examples
    183
  - Troubleshooting According to Image Defect
    183
- Troubleshooting for Fax Problems
  188
  - Fax Cannot be Sent
    188
  - Fax Cannot be Received
    189
  - Communication Error Occurs
    189
  - Receive Buffer Full During Receiving into Memory
    189
- Troubleshooting for Other Problems
  190
  - Cannot Make Print
    190
  - Problem of USB Direct Interface
    190
  - Cannot Update Firmware
    191
  - Tray Removed" Message Does Not Disappear
    191
Chapter 3 Disassembly/Reassembly

192
Safety Precautions

192
Packing

193
Screw Catalogue

194
Screw Torque List

195
Lubrication

197
Overview of Gears

199
Harness Routing

200
Disassembly Flow

217
Disassembly Procedure

218
- Preparation
  218
- Paper Tray / T1 Separation Pad ASSY
  219
- Back Cover
  220
- Rear Flapper Sub ASSY
  222
- Fuser Cover ASSY / Fuser Unit
  223
- Cord Hook
  228
- Side Cover L
  229
- Side Cover R
  230
- Back Cover Lower
  231
- Document Scanner Unit
  232
- ADF Unit (for Models with ADF)
  235
- Document Cover ASSY (for Models Without ADF)
  247
- Panel Unit
  249
  - Key PCB / Panel PCB / Touch Panel ASSY / LCD
    250
  - Panel PCB / LCD ASSY
    252
- Panel Flat Cable / First Side CIS Unit / First Side CIS Flat Cable
  254
- Modem Flat Cable / Modem PCB
  261
- Joint Cover ASSY
  262
- LED Unit
  265
- Speaker Unit
  267
- Nfc Pcb
  268
- LED Control Flat Cable / LED Control PCB
  270
- 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 PCB
  285
- Fan
  288
- Wlan Pcb
  289
- Main PCB
  290
- Cartridge Sensor Relay Flat Cable
  292
- Develop Release Clutch / Process Drive Unit / High-Voltage Power Supply Flat Cable / Process Motor Flat Cable / Paper Feed Motor Flat Cable
  293
- T1 Pick-Up Clutch / Registration Clutch / Paper Feed Drive Unit
  302
- Eject Sensor PCB
  304
- Roller Holder ASSY
  305
- Paper Feed Unit
  306
- Paper Eject ASSY
  308
- Duplex Tray
  309
- Low-Voltage Power Supply PCB
  310
- Registration Mark Sensor L PCB / Registration Mark Sensor R PCB
  314
Chapter 4 Adjustments and Updating of Settings, Required after Parts Replacement

316
If You Replace the Main Pcb

316
If You Replace the Registration Mark Sensor Assy or Led Assy

323
- Continuous Adjustments of Density and Registration Sensor (Function Code 73)
  323
If You Replace the Low-Voltage Power Supply Pcb

324
- 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 Pcb

325
- 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 Unit

326
- Acquisition of White Level Data (Function Code 55)
  326
- Scanning and Printing Check
  326
If You Replace the Fuser Unit

327
- Resetting Printed Pages Counter of the Fuser Unit (Reset Counters for Consumable Parts (Function Code 88))
  327
If You Replace a Pf Kit

328
- Resetting Printed Pages Counter of a PF Kit (Reset Counters for Consumable Parts (Function Code 88))
  328
Chapter 5 Service Functions

329
Maintenance Mode

329
Other Service Functions

411
- Change ON/OFF Setting of Color Registration
  411
- Print Communication Error List
  412
Chapter 6 Wiring Diagram

413
- Wiring Diagram
  413
Chapter 7 Periodical Maintenance

414
Precautions

414
Periodical Replacement Parts

415
- Preparation
  415
- Fuser Unit
  416
- PF Kit 1
  423
- PF Kit MP
  425

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Brother MFCL3750CDWL Manuals

Brother MFCL3750CDWL Service Manual (430 pages)

Table of Contents

Safety Information

Chapter 1 Supplemental Specifications

General

Network Connectivity

Service Information

Supplies

Media Specifications

Fax (Only for the Models with Fax Function)

Copy

Scanner

Chapter 2 Error Indication and Troubleshooting

Introduction

Overview

Error Indications

Troubleshooting

Chapter 3 Disassembly/Reassembly

Safety Precautions

Packing

Screw Catalogue

Screw Torque List

Lubrication

Overview of Gears

Harness Routing

Disassembly Flow

Disassembly Procedure

Chapter 4 Adjustments and Updating of Settings, Required after Parts Replacement

If You Replace the Main Pcb

If You Replace the Registration Mark Sensor Assy or Led Assy

If You Replace the Low-Voltage Power Supply Pcb

If You Replace the Lcd, Panel Unit or Panel Pcb

If You Replace the Adf Unit, First Side Cis Unit, Second Side Cis Unit or Document Scanner Unit

If You Replace the Fuser Unit

If You Replace a Pf Kit

Chapter 5 Service Functions

Maintenance Mode

Other Service Functions

Chapter 6 Wiring Diagram

Chapter 7 Periodical Maintenance

Precautions

Periodical Replacement Parts

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