Brother MFC-7050C User manual

FACSIMILE EQUIPMENT
SERVICE MANUAL
MODEL: MFC7050C

© Copyright Brother 1999
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.

PREFACE
This publication is a Service Manual covering the specifications, construction, theory of operation,
and maintenance of the Brother facsimile equipment. It includes information required for field
troubleshooting and repair--disassembly, reassembly, and lubrication--so that service personnel
will be able to understand equipment function, to rapidly repair the equipment and order any
necessary spare parts.
To perform appropriate maintenance so that the facsimile equipment is always in best condition
for the customer, the service personnel must adequately understand and apply this manual.
This manual is made up of six chapters and appendices.
CHAPTER I.GENERAL DESCRIPTION
CHAPTER II.INSTALLATION
CHAPTER III.THEORY OF OPERATION
CHAPTER IV.DISASSEMBLY/REASSEMBLY AND LUBRICATION
CHAPTER V. MAINTENANCE MODE
CHAPTER VI. ERROR INDICATION AND TROUBLESHOOTING
APPENDICES CIRCUIT DIAGRAMS
This manual describes the model and its versions to be destined for major countries. The specifications and
functions are subject to change depending upon each destination.

CHAPTER I.
GENERAL DESCRIPTION

CONTENTS
1. EQUIPMENT OUTLINE........................................................................................I-1
1.1External Appearance and Weight..................................................................I-1
1.2Components.................................................................................................I-1
2. SPECIFICATIONS................................................................................................I-2

I- 1
1. EQUIPMENT OUTLINE
1.1 External Appearance and Weight
The figure below shows the equipment appearance and approximate dimensions.
Weight: Machine proper Approx. 7 kg
In package Approx. 11 kg
1.2 Components
The equipment consists of the following major components:

I- 2
2. SPECIFICATIONS (1/3)
Model MFC7050C
Color White (1138)
PRINTER Engine Type Thermal ink jet
Print Speed (ppm) Up to 6 ppm/Mono, 300 x 600
Up to 3 ppm/Color
Resolution (dpi) 1200 x 1200, 600 x 600, 300 x 600
Emulation N/A
Printer Driver Windows 3.1/3.11, Windows 95/98,
NT Driver with Auto Installer Program
Fonts Resident N/A
Fonts Disk Based N/A
Paper Handling LTR, LGL, A4, B5, A5, A6, CM10, DL, C5, C6, CUST
Auto Sheet Feeder (ASF) Cut sheet: Min. 3" (W) x 5.0" (L)
Max. 8.5" (W) X 17" (L)
Envelope (C5/CM10/Mona)
ASF (Factory Std.) 1 (100 sheets)
Optional ASF N/A
ASF Capacity (No. of sheets) 100
Number of Ink Cartridges 2
Starter Ink Cartridge Life (5% duty) Approx. 600 pages (black)
Approx. 200 pages (color)
Approx. 300 pages (photo), optional
Interface IEEE1284 (Bidirectional)
Network Card N/A
SCANNER Color/Mono Mono CIS
Resolution (dpi) 100 x 100, 200 x 200, 400 x 400, 600 x 600 (Optical 200)
Gray Scale 256 shades
Twain Yes
Scanning Speed (ppm) 4 (Mono)
Formats TIFF, UniDoc, PCX, DCX
ADF (pages) 20
Input Size Letter/Legal/A4
OCR Yes (Xerox Textbridge)
COPY Color Copy N/A
Resolution (dpi) 300 x 600
Multi-copy Stack 99
Sort Yes
Reduction/Enlargement Yes (Ratio 50%-200%)
FAX Max. Modem Speed (bps) 14400
ITU-T Group G3
Coding Method MH/MR/MMR

I- 3
(2/3)
Model MFC7050C
FAX Error Correction Mode (ECM) Yes
Transmission Speed (sec.) 6
Gray Scale 256 (Error Diffusion)
Super Fine Yes (Send and Receive)
Multi-resolution TX N/A
Handset Yes
Speaker Phone N/A
One-touch Dial 12 X 2
Speed Dial 100
Tel-Index Yes
Chain Dialing Yes
Contrast Text (Light/Normal/Dark)
FAX/TEL Switch Yes
Distinctive Ringing Yes
Caller ID Yes (name or tel number)
Call Waiting N/A
TAD Interface Yes
Next FAX Reservation N/A
Coverpage Yes - Super
Polling Type Std/Seq
Password Check N/A
Memory Reception Yes (85 pages)
Delayed Timer Yes, 1 timer
Broadcasting Yes (Up to 174 locations)
Call Reservation N/A
Call Back Message N/A
ITU SUB Addressing N/A
BFT Compatible N/A
Color Fax Mode N/A
Fax Edit Mode N/A
Color File Transfer Yes (via BFT from PC)
Multi-Transmission N/A
DUAL ACCESS Yes
Input/Output Width 8.5" x 8.5"
Help List Yes
Auto Reduction Yes
Message Center OGM Yes
ICM Recording Time Up to 30 min.
Paging Yes
Toll Saver Yes
Fax & Voice Mail Box N/A
Fax-on-demand N/A

I- 4
(3/3)
Model MFC7050C
Message Center Voice-on-demand N/A
FAX Forwarding Yes
FAX Retrieval Yes
Message Center (PC MC) N/A
OGM N/A
ICM Recording Time N/A
Fax-on-demand N/A
Voice-on-demand N/A
Fax & Voice Mail Box N/A
FAX Forwarding N/A
General/Additional Feature
Energy Star Compliance N/A
Memory (Standard) 2 MB
Memory (Opt Upgrade) N/A
Simultaneous Operation Yes (FAX/PRINTER, SCAN/PRINTER,
COPY/PRINTER)
PC-FAX Host Software Std. Yes
Host Interface
(Scan/Print/PC-fax) Bi Centro
Video Capture/Video Print Yes (NTSC)
PC-Fax Protocol Compliance CLASS 1
Data Modem N/A
Bundled Software
PC-FAX (Send/Receive) Yes (SMSI)
Internet Fax Yes (Netcentric in Visioneer)
Color Viewer Yes (Visioneer)
Color PC-FAX Yes (3D-Fax)

CHAPTER II.
INSTALLATION

CONTENTS
1. INSTALLING THE UPDATE DATA TO THE FACSIMILE EQUIPMENT...............II-1

II - 1
1. INSTALLING THE UPDATE DATA TO THE
FACSIMILE EQUIPMENT
The facsimile equipment is available in two types--one with a flash ROM and the other with a
masked ROM. For the equipment with a flash ROM, if the program version is updated or the main
PCB is replaced, install the update program onto the flash ROM on the main PCB.
The program installation requires a host computer satisfying the following requirements:
- CPU Pentium 75 or higher
- RAM 8MB or greater (16MB recommended for Windows95)
- OS Windows3.1/3.11 or Windows95/98
Connecting the facsimile equipment to your computer
(1) Make sure that the equipment's power cord is unplugged from a wall socket.
(2) Make sure that your computer is powered off.
(3) Connect the interface cable to the parallel interface port on the back of the equipment and
secure it with the lock wires.
(4) Connect the other end of the interface cable to the printer port of your computer and secure
it with the two screws.
(5) Power on your computer.
(6) While holding down the 0key on the control panel of the facsimile equipment, plug the
power cord into a wall socket.
(7) Check that the equipment shows the "Send Flash Image" prompt on the LCD.

II - 2
Installing the update data onto the flash ROM of the facsimile equipment
During this procedure, do not disconnect the power cord or interface cable from the facsimile
equipment.
(1) Insert the floppy disk which stores the update data and transfer utility into the floppy disk
drive of your computer.
(Or, copy the update data and transfer utility onto the same directory of the hard disk.)
(2) Click the Start button, point to Programs, and then click MS-DOS Prompt to open an MS-
DOS window.
(3) Type the drive letter where the update data and transfer utility are located. If it is a floppy
disk drive, type A:\ from the command line and press the ENTER key.
(4) Check that your computer is connected with the facsimile equipment correctly.
(5) To start the transfer utility transmitting the update data to the flash ROM of the facsimile
equipment, type the following:
PPP.EXE filename
Then press the ENTER key.
As the installation proceeds, the equipment shows the following messages on the LCD in
order:
"Receiving Image"
"Erasing Flash"
"Writing Flash"
"Verifying Flash"
Upon completion of the downloading, the equipment shows "Cycle Power Now."
Disconnecting the facsimile equipment from your computer
(1) Unplug the equipment's power cord from the wall socket.
(2) After at least 5 seconds, disconnect the interface cable from the parallel interface port on
the back of the equipment.
(3) After at least 5 seconds, plug the equipment's power cord into a wall socket.

CHAPTER III.
THEORY OF OPERATION

CONTENTS
1. OVERVIEW...........................................................................................................III-1
2. MECHANISMS......................................................................................................III-2
2.1 Scanner Mechanism.....................................................................................III-3
2.1.1 Document feeding and ejecting mechanism..........................................III-4
2.1.2 Scanner................................................................................................III-4
2.2 Ink Jet Printing Mechanism...........................................................................III-5
2.2.1 Paper pulling-in, registration, feeding, and ejecting mechanisms...........III-5
2.2.2 Ink jet printing and capping mechanisms...............................................III-8
2.2.3 Carrier drive mechanism.......................................................................III-10
2.3 Sensors and Actuators..................................................................................III-11
3. CONTROL ELECTRONICS..................................................................................III-13
3.1 Configuration................................................................................................III-13
3.2 Main PCB.....................................................................................................III-14
3.3 NCU PCB.....................................................................................................III-16
3.4 Control Panel PCB........................................................................................III-17
3.5 Power Supply PCB.......................................................................................III-18
3.6 Interface PCB...............................................................................................III-19

III - 1
1. OVERVIEW

III - 2
2. MECHANISMS
The equipment is classified into the following mechanisms:
nSCANNER MECHANISM –Document feeding and ejecting mechanism
–Document scanning mechanism
nINK JET PRINTING MECHANISM –Paper pulling-in, registration, feeding, and ejecting
mechanisms
–Ink jet printing and head capping mechanisms
–Carrier drive mechanism
n SENSORS AND ACTUATORS

III - 3
2.1 Scanner Mechanism
This mechanism consists of the top cover, automatic document feeder (ADF), document feed
roller ASSY, document ejection roller ASSY, and document sensors. (For details about the
sensors, refer to Section 2.3.)
If the operator sets documents on the top cover and starts the scanning operation, the scanner
motor rotates so that the ADF (which consists of the separation roller ASSY and ADF parts) feeds
those documents into the equipment, starting from the bottom sheet to the top, page by page.
Each document advances with the document feed roller ASSY to the scanner, and then it is fed
out of the equipment with the document ejection roller ASSY.

III - 4
2.1.1 Document feeding and ejecting mechanism
To feed and eject documents, the scanner motor rotates counterclockwise. It rotates the sun gear
19/55 clockwise so that the planet gear 23 ASSY transmits the torque to the gear 19/47 and its
gear train.
After completion of paper ejection, the scanner motor rotates clockwise in order to disengage the
planet gear 23 ASSY from the gear 19/47. This allows you to pull back a document if jammed in
the backward direction.
(Viewed from the right)
2.1.2 Scanner
The scanner uses a contact image sensor (CIS) unit which consists of an LED array illuminating
documents, a self-focus lens array collecting the reflected light, a CIS PCB carrying out
photoelectric conversion to output picture element data, and a cover glass on which a document
advances. When the document passes between the document pressure bar and the cover glass,
it is scanned.

III - 5
2.2 Ink Jet Printing Mechanism
2.2.1 Paper pulling-in, registration, feeding, and ejecting mechanisms
The paper pulling-in, registration, feeding, and ejecting mechanisms are driven by a single paper
feed motor.