Brother MFC7420 service manual.pdf

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FACSIMILE EQUIPMENT
SERVICE MANUAL
MODELS: MFC7420/7820N
DCP7010/7020/7025
Confidential
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© Copyright Brother 2004
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.
Confidential
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.
HOW THIS MANUAL IS ORGANIZED
This manual is made up of nine chapters and appendices.
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.
Lists the specifications of each model, which enables you to make a comparison of different
models.
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.
Describes how to transfer data left in the machine to be sent for repair. The service personnel
should instruct end users to follow the transfer procedure given in this chapter if the machine at the
user site cannot print received data due to the printing mechanism defective. End users can
transfer received data to another machine to prevent data loss.
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 a disassembly order flow that guides you through a
shortcut to the object components.
This chapter also covers screw tightening torques and lubrication points to which the specified
lubricants should be applied during reassembly jobs.
REPLACEMENT
Details adjustments and updating of settings, which are required if the head/carriage unit, main
PCB and some other parts have been replaced.
Provides cleaning procedures not covered by the User's Manual. Before starting any repair work,
clean the machine as it may solve the problem concerned.
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Describes the maintenance mode which is exclusively designed for the purpose of checks, settings
and adjustments 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, paper
feed roller or paper ejection roller (if they 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).
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.
Shows the location of serial number labels put on some parts and lists the coding information
pertaining to the serial numbers.
Provides instructions on how to update firmware stored in the flash ROM on the main PCB or load
firmware to a new main PCB from the host PC.
No hardware replacement is required for updating.
Lists the customizing codes for the various preferences exclusively designed for each destination
(e.g. language). Those codes are stored in the memory (EEPROM) mounted on the main PCB. If
the main PCB is replaced with a new one, therefore, you will need to set the proper customizing
codes with the machine in the maintenance mode.
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.
Provides the wiring diagram that helps you understand the connections between PCBs.
Provides the circuit diagrams of the NCU PCB and power supply PCB.
This manual describes the models and their versions destined for major countries.
The specifications and functions are subject to change depending upon each destination.
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TABLE OF CONTENTS
CHAPTER 1
PARTS NAMES & FUNCTIONS
1.1
EQUIPMENT OUTLINE............................................................................................. 1-1
1.2
CONTROL PANEL .................................................................................................... 1-2
1.3
COMPONENTS ......................................................................................................... 1-4
CHAPTER 2
SPECIFICATIONS
2.1
GENGERAL............................................................................................................... 2-1
2.2
SPECIFICATIONS LIST ............................................................................................ 2-8
CHAPTER 3
THEORY OF OPERATION
3.1
OVERVIEW................................................................................................................ 3-1
3.2
MECHANICAL COMPONENTS ................................................................................ 3-2
3.2.2.1 Paper supply ................................................................................................ 3-6
3.2.2.2
Push-up function of paper tray..................................................................... 3-8
3.2.2.5 Drum unit.................................................................................................... 3-11
3.2.3
Sensors and Actuators ....................................................................................... 3-18
3.3
CONTROL ELECTRONICS .................................................................................... 3-19
CHAPTER 4
TRANSFER OF DATA LEFT IN THE MACHINE TO BE SENT FOR REPAIR
4.1
TRANSFERRING RECEIVED FAX DATA ................................................................ 4-1
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