Brother DCP-6690CW User manual

Confidential

Inkjet DCP/MFC

SERVICE MANUAL

MODELS: DCP6690CW

MFC6490CW

MFC6890CDW

April 2008

SM-FAX089

8CAF11(3)

Read this manual thoroughly before maintenance work.

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

Confidential

No part of this publication may be reproduced in any

form or by any means without permission in writing

from the publisher.

Specifications are subject to change without notice.

Trademarks

The Brother logo is a registered trademark of Brother Industries, Ltd.

Brother is a registered trademark of Brother Industries, Ltd.

Multi-Function Link is a registered trademark of Brother International Corporation.

Windows Vista is either a registered trademark or a trademark of Microsoft Corporation in the United

States and other countries. Microsoft, Windows and Windows Server are registered trademarks of

Microsoft Corporation in the United States and/or other countries.

Macintosh and TrueType are registered trademarks of Apple Inc.

Nuance, the Nuance logo, PaperPort and ScanSoft are trademarks or registered trademarks of

Nuance Communications, Inc. or its affiliates in the United States and/or other countries.

Presto! PageManager is a registered trademark of NewSoft Technology Corporation.

Microdrive is a trademark of International Business Machines Corporation.

CompactFlash is a registered trademark of SanDisk Corporation.

Memory Stick is a registered trademark of Sony Corporation.

SanDisk is a licensee of the SD and miniSD trademarks.

xD-Picture Card is a trademark of Fujifilm Co. Ltd., Toshiba Corporation and Olympus Optical Co. Ltd.

PictBridge is a trademark.

Memory Stick Pro, Memory Stick Pro Duo, Memory Stick Duo and MagicGate are trademarks of Sony

Corporation.

BROADCOM, SecureEasySetup and the SecureEasySetup logo are trademarks or registered

trademarks of Broadcom Corporation in the United States and/or other countries.

AOSS is a trademark of Buffalo Inc.

Wi-Fi, WPA and WPA2 are registered trademarks and Wi-Fi Protected Setup is a trademark of Wi-Fi

Alliance.

FaceFilter Studio is a trademark of Reallusion, Inc.

Each company whose software title is mentioned in this manual has a Software License Agreement

specific to its proprietary programs.

All other brand and product names mentioned in this manual are trademarks or registered

trademarks of their respective companies.

iConfidential

Preface

This Service Manual is intended for use by service personnel and details the specifications,

construction, theory of operation, and maintenance for the Brother machines noted on the front

cover. It includes information required for troubleshooting and service--disassembly,

reassembly, and lubrication--so that service personnel will be able to understand equipment

function, repair the equipment in a timely manner and order spare parts as necessary.

To perform appropriate maintenance so that the machine is always in the best possible

condition for the customer, service personnel must adequately understand and apply this

manual.

The table below shows the functional comparison between the models covered by this manual.

This manual describes the models and their versions destined for major countries. The specifications and

functions are subject to change depending upon each destination.

Model DCP6690CW MFC6490CW MFC6890CDW

RAM 64 MB

LCD (with backlight) 4.2-inch wide color 3.3-inch wide color 4.2-inch wide color

Touch panel √--- √

Wired LAN √√√

Wireless LAN (WLAN PCB) √√√

PhotoCapture Center √√√

PictBridge/USB flash memory drive √√√

Movable platen --- --- ---

Paper tray #2 Up to A3/LGR Up to A3/LGR Up to A3/LGR

Photo tray --- --- ---

ADF √√√

Outer back cover Large Large Large

High yield ink cartridge sensor --- --- ---

Ink cartridge detection sensors √√√

Ink empty sensors √√√

Handset --- --- ---

Duplex printing --- --- √

Backup battery --- √√

FAX --- √√

ii Confidential

How this manual is organized

This manual is made up of nine chapters and appendices.

CHAPTER 1 PARTS NAMES AND FUNCTIONS

Contains external views and names of components and describes their functions. Information

about the keys on the control panel is included to help you check operation or make

adjustments.

CHAPTER 2 SPECIFICATIONS

Lists the specifications of each model, which enables you to make a comparison of different

models.

CHAPTER 3 THEORY OF OPERATION

Gives an overview of the scanning and printing mechanisms as well as the sensors, actuators,

and control electronics. It aids in understanding the basic principles of operation as well as

locating defects for troubleshooting.

CHAPTER 4 ERROR INDICATION AND TROUBLESHOOTING

Details error messages and codes that the incorporated self-diagnostic functions display if any

error or malfunction occurs. If any error message appears, refer to this chapter to find which

components should be checked or replaced.

The latter half of this chapter provides sample problems that could occur in the main sections of

the machine and related troubleshooting procedures. This will help service personnel pinpoint

and repair defective components.

CHAPTER 5 HANDLING DATA HELD IN THE MACHINE PRIOR TO

REPAIR

Describes how to handle data held in the machine to be repaired.

At the user site, if the machine cannot print FAX data received and left in the machine due to

the printing mechanism defective, the service personnel should instruct the end user to follow

the transfer procedure given in this chapter to transfer the FAX data to another machine before

sending the machine for repair.

At the service site, the service personnel should back up the machine information and user data

held in the machine into an external memory for restoration after repair, using the backup

procedure given in this chapter.

CHAPTER 6 DISASSEMBLY/REASSEMBLY AND LUBRICATION

Details procedures for disassembling and reassembling the machine together with related notes.

The disassembly order flow provided enables you to see at a glance the quickest way to get to

component(s) involved.

At the start of a disassembly job, you check the disassembly order flow that guides you through

a shortcut to the target components.

This chapter also covers screw tightening torques and lubrication points to which the specified

lubricants should be applied during reassembly jobs.

iii Confidential

CHAPTER 7 ADJUSTMENTS AND UPDATING OF SETTINGS,

REQUIRED AFTER PARTS REPLACEMENT

Details adjustments and updating of settings, which are required if the head/carriage unit, main

PCB and some other parts have been replaced.

CHAPTER 8 CLEANING

Provides cleaning procedures not covered by the User's Guide. Before starting any repair work,

clean the machine as it may solve the problem concerned.

CHAPTER 9 MAINTENANCE MODE

Describes the maintenance mode which is exclusively designed for the purpose of checks,

settings and adjustments of the machine using the keys on the control panel.

In the maintenance mode, you can update memory (EEPROM: electrically erasable

programmable read-only memory) contents for optimizing the drive conditions of the head/

carriage unit or the paper feed roller and paper ejection roller in the engine unit, if those units

have been replaced, or for setting the CIS scanner area, for example. You can also customize

the EEPROM according to the shipment destination of the machine concerned. In addition, you

can perform operational checks of the LCD, control panel PCB or sensors, perform a print test,

display the log information or error codes, and modify firmware switches (WSW).

Appendix 1 Reading Labels

Shows the location of labels put on some parts and describes the coding information for serial

number, property data, and manufacturing information.

Appendix 2 Firmware Installation

Provides instructions on how to change firmware stored in the flash ROM on the main PCB or

load firmware to a new main PCB from the host PC.

Appendix 3 EEPROM Customizing Codes

Provides instructions on how to set up the EEPROM customizing codes for the various

preferences exclusively designed for each destination. The specified customizing code is stored

in the EEPROM mounted on the main PCB. If the main PCB is replaced, therefore, you need to

set up the proper customizing code with the machine in the maintenance mode.

Customizing codes customize firmware for individual models, enabling the common firmware

to be used for various models. A list of EEPROM customizing codes comes with the firmware

data provided by Brother Industries.

Appendix 4 Firmware Switches (WSW)

Describes the functions of the firmware switches, which can be divided into two groups: one is

for customizing preferences designed for the shipping destination (as described in Appendix 3)

and the other is for modifying preferences that match the machine to the environmental

conditions. Use the latter group if the machine malfunctions due to mismatching.

Appendix 5 Wiring Diagrams

Provides the wiring diagrams that help you understand the connections between PCBs.

iv Confidential

Appendix 6 Circuit Diagrams

Provides the circuit diagrams of the MJ PCB and power supply PCB.

Appendix 7 Deletion of Personal Information

Provides instructions on how to delete personal information recorded in the machine.

vConfidential

SAFETY PRECAUTIONS

Symbols used in the documentation

vi Confidential

vii Confidential

viii Confidential

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