Brother MFC 5490CN - Color Inkjet - All-in-One User manual

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Inkjet MFC
SERVICE MANUAL
MODEL: MFC5490CN
July 2008
SM-FAX096
8CAH11(1)
Read this manual thoroughly before maintenance work.
Keep this manual in a convenient place for quick and easy reference at all times.

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© Copyright Brother 2008
All rights reserved.
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.

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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 MFC5490CN
RAM 40 MB
LCD Monochrome LCD (16 chars x 2 lines)
Touch panel ---
Wired LAN √
Wireless LAN (WLAN PCB) ---
PhotoCapture Center √
PictBridge/USB flash memory drive √
Movable platen √
ADF √
High yield ink cartridge sensor ---
Ink cartridge detection sensors √
Ink empty sensors √
Handset (Hook switch PCB) ---
Duplex printing ---
Backup battery ---

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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.

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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.

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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.

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SAFETY PRECAUTIONS

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CHAPTER 1
PARTS NAMES AND FUNCTIONS

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CHAPTER 1 PARTS NAMES AND FUNCTIONS
This chapter 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.
CONTENTS
1.1 OUTLINE................................................................................................................1-1
1.2 CONTROL PANEL .................................................................................................1-3
1.3 COMPONENTS......................................................................................................1-5

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1.1 OUTLINE
Front view
(frontview_BHL9_A4)
(4) Madia slots for
(9) Scanner Cover
(Scanner Unit)
(1) ADF & document cover ASSY
(2) Control Panel
(3) Ink cartridge cover
(7) Telephone line jack
(5) Paper tray
(6) Port for PictBridge /
(8) External telephone line jack
PhotoCapture Cente
r
USB flash memory drive

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Back view
No. Name Description
(1) ADF & document cover ASSY
ADF: Load documents (originals) here. Documents
will be fed into the machine, page by page.
Document cover: Open to place the document
(original) on the scanner glass.
(2) Control Panel Use the keys to operate the machine. The liquid crystal
display (LCD) shows the machine operation status.
(3) Ink cartridge cover Open to replace ink cartridges.
(4) Media slots for PhotoCapture Center Insert a memory card here.
(5) Paper tray Load paper here. Paper will be fed into the machine,
sheet by sheet.
(6) Port for PictBridge / USB flash
memory drive
Connect a digital camera (with PictBridge) to this
connector using the USB cable.
Insert a USB flash memory drive here.
(7) Telephone line jack Plug in the modular plug on the telephone line here.
(8) External telephone line jack Plug in the modular plug on the external telephone line
here.
(9) Scanner Cover (Scanner Unit) Open to remove jammed paper.
(10) Jam clear cover Open to remove paper jammed inside the machine.
(11) USB interface connector Connect the USB cable here.
(12) LAN cable connector Connect the LAN cable here.
LAN USB
(backview_BHL9_A4)
(11) USB interface connector
(12) LAN cable connector
(10) Jam clear cover

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1.2 CONTROL PANEL
11 10 8
97
123456

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1.3 COMPONENTS
The machine consists of the following major components:
ADF & document cover
ASSY
Scanner cover
(Scanner unit)
Scanner cover damper
Wire spring
Speaker
Rear under cover
Scanner cover
support
Control panel ASSY
Upper cover Head/carriage unit
Engine unit
PF encoder PCB
Registration sensor
PCB
Flushing box
Front cover
Lower cover
Power supply PCB
MJ/PS shield unit
Paper tray ASSY
Ink absorber box
Main PCB ASSY
Ink refill ASSY
Maintenance unit
Ink cartridge cover
Media module cover
(COMPONENTS_BHL9_A4)
MJ PCB
Edge cover L
Side cover L
Edge cover R
Side cover R
Jam clear cover