Brother HL-4040CN, HL-4050CDN, HL-4070CDW User Manual

Confidential
Brother Color Laser Printer
SERVICE MANUAL
MODEL:
HL-4040CN/4050CDN/4070CDW
Read this manual thoroughly before maintenance work.
Keep this manual in a convenient place for quick and easy reference at all times.
February 2007
SM-PRN061
(7)

Brother HL-4040CN, HL-4050CDN, HL-4070CDW Specifications

General

Brand	Brother
Model	HL-4040CN, HL-4050CDN, HL-4070CDW
Category	Printer
Language	English

Summary

Brother Color Laser Printer Service Manual

Model: HL-4040CN/4050CDN/4070CDW

Specifies the printer models covered by the service manual.

Preface

Chapter 1: Troubleshooting

Details error messages, codes, and troubleshooting procedures for malfunctions.

Chapter 2: Periodical Maintenance

Covers consumable and replacement parts and their maintenance procedures.

Chapter 3: Disassembly and Assembly

Provides procedures for disassembling and assembling machine parts.

Chapter 4: Adjustments and Updating of Settings, Required After Parts Replacement

Details adjustments needed after replacing main PCB or other parts.

Chapter 5: Service Functions

Describes maintenance mode, settings, and hidden functions.

Chapter 6: Circuit Diagrams, Wiring Diagram

Provides circuit and wiring diagrams for PCB connections.

Chapter 1: Troubleshooting

1.1 General Precautions

Lists essential precautions to prevent secondary problems during troubleshooting.

1.2 Initial Machine Checks

Details items to check before attempting machine repair.

2. Error Codes

Lists error codes, their indications, and causes/remedies.

3. Paper Feeding Problems

Covers issues related to paper feeding, such as no feeding or double feeding.

4. Image Defect Troubleshooting

Addresses problems related to print quality and image defects.

Chapter 3: Disassembly and Assembly

1. Safety Precautions for Maintenance

Outlines essential safety measures to follow during maintenance.

3. Screw Torque Specifications

4. Lubrication Guide

7. Disassembly Flowchart

8. Disassembly Procedures

Details the step-by-step process for removing various machine components.

Industry Canada Compliance Statement (Canada)

Safety Information

Laser Product Cautionary Notes

Provides caution for servicing the laser product with open covers.

Optical System Servicing Precautions

General Safety Precautions

High Voltage and Electrical Safety Warnings

Lists critical warnings regarding high voltage electrodes and handling plugs.

Operational Safety Warnings

Error Codes

2.1 Error Indication and Resolution

Lists error codes, their problems, and cross-references to remedies.

Error Cause and Remedy

2.2.1 Recoverable Errors by User Check

Lists errors that users can resolve by following LCD messages or user checks.

Toner Cartridge Life and Status Errors

Paper Jam Troubleshooting

Tray Installation and Paper Size Errors

Paper Jam Errors by Tray Type

Paper Feed Errors and Manual Feed Selection

Tray Detection and Front Cover Open Errors

Toner Cartridge Identification Errors

Tray Malfunction and EL Lamp Errors

Chapter 3: Paper Feeding Problems

3.1 No Feeding

3.2 Double Feeding

Paper Jam Troubleshooting Procedures

Dirt on Paper and Paper Wrinkles

Chapter 4: Image Defect Troubleshooting

4.3 Troubleshooting Image Defects

Light Print on Entire Page

Single Color Lightness and Registration Issues

Dark Prints and Poor Toner Fixing

Blank Prints and Image Distortion

Single Color Prints and Back Paper Dirt

Vertical Streaks in Printouts

Horizontal Stripes in Printouts

White Streaks and Stripes on Single Color Images

Faint Prints and White Spots on Prints

Single Color Spots/Dirt and Color Bands

Fogging, Horizontal Lines, and Ghosting Issues

Color Misregistration and Print Fogging

Unstable Color Density and Hollow Prints

Dirt on Paper Bottom Edge

Chapter 2: Periodical Maintenance

1. Consumable Parts Information

2. Periodical Replacement Parts

2.1 List of Periodical Replacement Parts

Lists parts recommended for periodic replacement based on service life.

2.2 Procedures for Replacing Periodical Parts

2.2.1 Fuser Unit & Toner Filter Frame Assembly

Provides step-by-step instructions for replacing the fuser unit and toner filter frame assembly.

2.2.2 Laser Unit Replacement Procedure

2.2.3 Paper Feeding Kit Replacement

2.2.4 MP Paper Feeding Kit Replacement

2.3 Parts Life Reset Function

3. Screw Torque Specifications

4. Lubrication Guide

7. Disassembly Flowchart

8. Disassembly Procedures

8.2 Toner Cartridge Removal

8.3 Drum Unit Removal

8.4 Belt Unit Removal

8.5 Waste Toner Box Removal

8.6 Paper Tray Removal

8.7 DX Feed Assembly Removal

8.8 MP Cover and Paper Guide Assembly Removal

8.9 MP Lift Arm 2 and Roller Holder Assembly Removal

8.10 Fuser Unit and Toner Filter Frame Assembly Removal

8.12 Paper Eject Assembly Removal

8.15 Transfer HVPS PCB Unit Removal

8.16 Sensor PCB and HVPS PCB Removal

8.22 Paper Feed Frame Unit and Sensor PCB Removal

8.23 Belt Cleaner Release Sensor PCB Assembly Removal

8.26 Front Door Unit Assembly Removal

8.32 Engine PCB Assembly Removal

8.33 Main PCB, Ground Plates Removal

8.45 Wireless LAN PCB Assembly Removal

8.46 Laser Unit and Hook Slope Removal

8.47 Develop Drive Motor Assembly Removal

8.48 Drum Drive Assembly and Sensor PCB Removal

8.49 Drive Frame Unit Assembly Removal

8.50 Paper Feed/Belt Cleaner Motor Assembly Removal

8.51 Develop Release Sensor PCB Assembly Removal

8.52 Develop Press Drive L Assembly Removal

8.53 Front Cover Interlock Switch Assembly Removal

8.54 Toner Sensor PCB Assembly Removal (K, Y, M, C)

8.55 New Toner Actuator and Spring Removal

8.59 Charge HVPS PCB Assembly Removal

8.64 PS PCB Unit Removal

8.65 Belt Unit Drive Motor Assembly Removal

9. Disassembly Procedure (LT-100CL)

9.1 LT Paper Tray Removal

9.9 LT Paper Feed Frame Unit Removal

Chapter 4: Adjustments and Updates After Parts Replacement

1. Main PCB Replacement Procedures

Details procedures for rewriting firmware and setting parameters after main PCB replacement.

Firmware Files by Country

Firmware Rewriting Using USB Drive

Firmware Rewriting Using FILEDG32.EXE

Setting the Serial Number

Performing Auto Registration

2. Engine PCB Replacement Procedures

Chapter 5: Service Functions

1. Maintenance Mode Overview

Explains how to enter and use the machine's maintenance mode.

1.1 Entering Maintenance Mode

Provides steps to enter the general maintenance mode.

1.2 End User Accessible Maintenance Mode

Explains how to access limited maintenance functions for end users.

1.3 List of Maintenance Functions

1.4.1 EEPROM Parameter Initialization

1.4.2 Test Pattern Printing

1.4.3 Worker Switch (WSW) Settings

[1] Worker Switch Setting Procedure

[2] Printout of Worker Switch Data

1.4.4 LCD Operational Check

1.4.5 Control Panel PCB Operational Check

1.4.6 ROM Version Check

1.4.8 Drum Unit Cleaning Procedure

1.4.9 Sensor Operational Check

1.4.10 EEPROM Log Printout

1.4.12 Color Registration Adjustment

1.4.13 Paper Feeding and Ejecting Test

1.4.15 Registration-mark Sensor Sensitivity Adjustment

1.4.16 Maintenance Information Printout

1.4.17 Fan Operational Check

1.4.18 Machine Log Information Display

1.4.19 Error Code Indication

1.4.20 Developing Bias Voltage Correction

2.2 Develop Roller Counter Reset Function

2.3 Printer Settings Printout

Counter and History Information Details

2.4 Fuser Unit Error Recovery

2.5 Setting Lock Password Management

Chapter 6: Circuit Diagrams and Wiring Diagrams

Main PCB Circuit Diagram (Part 1 of 6)

Engine PCB Circuit Diagram (Part 5 of 5)

Charge High-voltage Power Supply PCB Circuit Diagram (Part 1 of 4)

Transfer High-voltage Power Supply PCB Circuit Diagram (Part 1 of 2)

Low-voltage Power Supply PCB Circuit Diagram (100V)

Wiring Diagram (Part 1 of 2)