Brother MFC9100C, MFC760 Service manual
FACSIMILE EQUIPMENT
SERVICE MANUAL
MODEL: MFC9100C/MFC760
© 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, LUBRICATION AND ADJUSTMENT
CHAPTER V. MAINTENANCE MODE
CHAPTER VI. ERROR INDICATION AND TROUBLESHOOTING
Appendix 1. EEPROM Customizing Codes
Appendix 2. 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
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
1. EQUIPMENT OUTLINE
1.1 External Appearance and Weight
The figure below shows the equipment appearance and approximate dimensions.
Weight: Machine proper Approx. 16 kg (36 lb.)
In package Approx. 20 kg (44 lb.)
1.2 Components
The equipment consists of the following major components:
I - 1
2. SPECIFICATIONS
MODEL MFC9100C MFC760
GENERAL
Print Engine BY2 BY2
Modem Speed (bps) 14.400 14.400
Transmission Speed (sec) 6 6
ITU-T Group G3 G3
Coding Method MH/MR/MMR MH/MR/MMR
Input/Output Width 8.5"/8.5" 8.5"/8.5"
ADF (pages) 50 50
LCD Size 16 x 2 16 x 2
On-Screen Programming Yes Yes
Backup Clock 1 hour 1 hour
Memory Capacity 8 MB 8 MB
Backup Memory N/A N/A
Optional Memory N/A N/A
Color New Color New Color
Standby Mode N/A N/A
PC-Fax Protocol Compliance Class 1, 2 Class 1,2
Simultaneous Operation Yes (Print/Fax, Print/Copy, Print/Scan) Yes (Print/Fax, Print/Copy, Print/Scan)
Data Modem N/A N/A
Energy Star Compliance Yes Yes
TELEPHONE
Automatic Redial Yes Yes
Handset N/A N/A
One-Touch Dial 16 16
Speed Dial 100 100
Telephone Index Yes Yes
Speaker Phone N/A N/A
Chain Dialing Yes Yes
Caller ID Yes N/A
Call Waiting Caller ID N/A N/A
Distinctive Ringing Yes Yes for UK
Hold/Mute Key N/A N/A
Junk Call Barrier N/A N/A
Power Failure Dialing N/A N/A
Ringer Volume Yes (3 levels + OFF) Yes (3 levels + OFF)
PBX Feature No No
Transfer Method Flash Flash
Digits of One-Touch & Speed Dial 20 digits 20 digits
Registrable Number of Characters 15 chars 15 chars
FAX
Internet FAX Yes (Netcentric) Yes (WordCraft)
Easy Receive/Fax Detect Yes Yes
Fax/Tel Switch N/A N/A
Super Fine Yes Yes
300 dpi Transmission N/A N/A
(1/4)
I - 2
MODEL MFC9100C MFC760
Gray Scale 256 256
Contrast Text (Light/Normal/Dark), Photo Text (Light/Normal/Dark), Photo
Smoothing N/A N/A
Call Reservation N/A N/A
Password Check N/A N/A
Enhanced Remote Activation Yes Yes
Multi-Resolution Transmission Yes Yes
Multi Transmission N/A N/A
Next-Fax Reservation Yes (= DUAL ACCESS) Yes (= DUAL ACCESS)
Delayed Timer Yes (Up to 50 timers or 50 jobs) Yes (Up to 50 timers or 50 jobs)
Polling Yes (Std/Seq) Yes (Std/Del/Seq/Sec)
Quick Scan (Memory Transmission) Yes (Super/3 sec.)
Broadcasting Yes (166 locations) Yes (166 locations)
Batch Transmission N/A N/A
Auto Reduction Yes Yes
Out-of-Paper Reception Yes (600 pages x 11K) Yes (600 pages x 11K)
Dual Access Yes Yes
ECM (Error Correction Mode) Yes Yes
ITU SUB Addressing N/A N/A
LIST/REPORT
Activity Report/Journal Report Yes Yes
Transmission Verification Report Yes Yes
Coverpage Yes (Super) Yes (Super)
Help List Yes Yes
Callback Message No No
Caller ID List Yes No
INTERFACE
External TAD Interface Yes Yes
Missing Link/PC Interface No No
Printer Interface Yes (Parallel) Yes (Parallel)
COLOR
BFT Compatible Yes Yes
Color Fax Mode No No
PRINTER
Color/Mono Color Color
Engine Type Piezo inkjet Piezo inkjet
Resolution (dpi) 1440 x 720, 720 x 720,
Speed (ppm) Mono: Up to 7 (360 x 180)
Paper Capacity (sheets) 250 250
- 590 pages x 11K
360 x 360, 360 x 180
Color: Up to 4 (360 x 180)
Yes (Super/3 sec.)
- 590pages x 11K
1440 x 720, 720 x 720,
360 x 360, 360 x 180
Mono: Up to 7 (360 x 180)
Color: Up to 4 (360 x 180)
(2/4)
Optional Paper Capacity (sheets) N/A N/A
Standard Print Language GDI GDI
Emulation Windows GDI, EPSON ESC/P Windows GDI, EPSON ESC/P
Resident Fonts 1 (10, 12, 15 cpi and Ps for each font) 1 (10, 12, 15 cpi and Ps for each font)
Fonts Disk Based 35 35
Paper Handling Size LTR, LGL, A4, B5, A5, A6
CM10, DL, C5, C6, B5
LTR, LGL, A4, B5, A5, A6
CM10, DL, C5, C6, B5
I - 3
MODEL MFC9100C MFC760
Paper Cassette Cut sheet: Min.2.75" (W) x 5.0" (L)
Output paper : 100 sheets
Printer Driver Windows 3.1/3.11/95/98/NT4.0
Utility Software Brother Resource Manager Brother Resource Manager
Photo Realistic Print N/A N/A
Ink Cartridge Life (Black) 750 pages (5% duty) 750 pages (5% duty)
Ink Cartridge Life (Color) 400 pages (5% duty for each color) 400 pages (5% duty for each color)
Ink Cartridge Life (Photo) N/A N/A
Interface Type Parallel (IEEE1284) Parallel (IEEE1284)
Bundled Cable Parallel Option
Network Option (Pony) Option (Pony)
COPY
Color Yes Yes
Speed (ppm) Color: 4 ppm, Mono: 5 ppm Color: 4 ppm, Mono: 5 ppm
Multi Copy Yes (Mono: 99 pages/Color: 99 pages) Yes (Mono:99 pages/Color:99 pages)
Sort Yes Yes
Reduction/Enlargement Yes (25% to 400%) Yes (25% to 400%)
Resolution (dpi) Color: Max. 1440 x 720
SCANNER
Color/Mono Color/Mono Color/Mono
Resolution (dpi) 300 x 300 (Opt.)/1200 x 1200 (Int.) 300 x 300 (Opt.)/1200 x 1200 (Int.)
Gray Scale 256 256
TWAIN Compliant Yes Yes
Formats (Import) TIFF, UniDoc, PCX, DCX TIFF, UniDoc, PCX, DCX
Formats (Export) TIFF, UniDoc, PCX, DCX TIFF, UniDoc, PCX, DCX
OCR Yes (Xerox TextBridge) Yes (Xerox TextBridge)
MESSAGE CENTER / MESSAGE MANAGER
ICM Recording Time No No
Page Memory (Out-of-Paper Reception) 600 pages x 11K 600 pages x 11K
OGM (MC/MC Pro/Paging/F/T) No No
TAD Type No No
Memo/Recording Conversation No No
Fax Forwarding Yes Yes
Fax Retrieval Yes Yes
Paging Yes No
Remote Access Yes Yes
Toll Saver No No
MESSAGE CENTER PRO/MESSAGE
MANAGER PRO
Fax & Voice Mail Box No No
Fax- & Voice-on-Demand No No
Max. 8.5" (W) x 14.0" (L)
Envelop (BL/C5/CM10/Mona)
with auto installer program
Min. 360 x 180
Mono: Max. 720 x 720
Min. 360 x 180
Cut sheet: Min.2.75" (W) x 5.0" (L)
Output paper : 100 sheets
Max. 8.5" (W) x 14.0" (L)
Envelop (BL/C5/CM10/Mona)
Windows 3.1/3.11/95/98/NT4.0
Color: Max. 1440 x 720
Min. 360 x 180
Mono: Max. 720 x 720
Min. 360 x 180
(3/4)
I - 4
MODEL MFC9100C MFC760
MESSAGE CENTER (PC MC)
Fax Forwarding No No
Paging No No
ICM Recording Time No No
OGM MC/MC Pro/Paging No No
Fax & Voice Mail Box No No
Fax- & Voice-on-Demand No No
VIDEO CAPTURE
Video Capture Yes Yes
Video Print Yes Yes
Video Format NTSC PAL
BUNDLED SOFTWARE
PC Fax SMSI WordCraft
Viewer Visioneer WordCraft
Printer Driver Brother Brother
Others Auto E-mail printing
Netcentric (PC Internet Fax)
3D Fax Speed (PC Color Fax)
Corel Print & Photo House
ACCESSORY
Cartridges Black cartridge
Cyan cartridge
Magenta cartridge
Yellow cartridge
Paper Type BP36CL (720 dpi high-quality coated paper)
BP72CL (720 dpi high-quality coated paper)
BPGLL (Glossy paper)
BPTRL (Transparencies)
BP36CA (360 dpi high-quality coated paper)
BP72CA(720 dpi high-quality coated paper)
Auto E-mail printing
Black cartridge
Cyan cartridge
Magenta cartridge
Yellow cartridge
BPGLA(Glossy paper)
BPTRA(Transparencies)
(4/4)
I - 5
CHAPTER II.
INSTALLATION
CHAPTER II. INSTALLATION
CONTENTS
1. INSTALLING THE UPDATE DATA TO THE FACSIMILE EQUIPMENT...............II-1
1. INSTALLING THE UPDATE DATA TO THE
FACSIMILE EQUIPMENT
If the program version is updated or the main PCB is replaced, install the update program onto the
flash ROM of the main PCB.
The program installation requires a PC/AT-compatible computer (which is capable of running MSDOS or its compatible OS).
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 left side 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) Plug the equipment's power cord into a wall socket.
II - 1
Installing the update data onto the flash ROM of the facsimile equipment
(1) Copy the update data and transfer utility onto the desired directory of the hard disk.
e.g., C:\UPDATE
(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. In the above
example, type C: from the command line and press the ENTER key.
Then type CD UPDATE 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:
ICEN filename /b
Then press the ENTER key.
The equipment beeps and shows the "CONNECTING" on the LCD for one second.
Then, the equipment shows the "DOWNLOADING" on the LCD and starts receiving data
downloaded from the host computer.
During downloading, the equipment beeps intermittently.
Upon completion of the downloading, the equipment beeps continuously.
II - 2
CHAPTER III.
THEORY OF OPERATION
CHAPTER III. THEORY OF OPERATION
CONTENTS
1. OVERVIEW...........................................................................................................III-1
2. MECHANISMS......................................................................................................III-2
2.1 Scanner Mechanism.....................................................................................III-3
2.2 Ink Jet Printing Mechanism...........................................................................III-5
2.2.1 Paper pick-up, registration, feeding, and ejecting mechanisms..............III-5
2.2.2 Ink jet printing and capping mechanisms...............................................III-6
2.2.3 Purging mechanism..............................................................................III-9
2.2.4 Carriage drive mechanism....................................................................III-11
2.3 Sensors and Actuators..................................................................................III-12
3. CONTROL ELECTRONICS..................................................................................III-15
3.1 Configuration................................................................................................III-15
3.2 Main PCB.....................................................................................................III-16
3.3 NCU PCB.....................................................................................................III-18
3.4 Control Panel PCB........................................................................................III-21
3.5 Power Supply PCB.......................................................................................III-22
1. OVERVIEW
III - 1
2. MECHANISMS
The equipment is classified into the following mechanisms:
n SCANNER MECHANISM – ADF mechanism
n INK JET PRINTING MECHANISM – Paper pick-up, registration, feeding, and ejecting
n SENSORS AND ACTUATORS
– Document scanning mechanism
mechanisms
– Ink jet printing and head capping mechanisms
– Purging mechanism
– Carriage drive mechanism
III - 2
2.1 Scanner Mechanism
This mechanism consists of the following:
- document tray ASSY which consists of a document chute and document tray,
- automatic document feeder (ADF) unit which consists of a document feed roller ASSY,
document ejection roller ASSY, ADF motor, and document front and rear sensors, and
- scanner unit which consists of a scanner top cover, CCD unit, CCD drive mechanism, CCD HP
sensor, and scanner base.
For details about the sensors, refer to Section 2.3.
III - 3
This scanner mechanism supports a dual scanning system.
(1) If you set documents with their faces up on the document chute and start the scanning
operation, the ADF motor rotates so that the document feed roller ASSY feeds those
documents into the ADF unit, starting from the bottom sheet to the top, page by page. Each
document curves downwards and turns to the right so as to advance above the CCD unit, and
then it is fed out to the document tray with the document ejection roller ASSY.
This way, documents move above the CCD unit being kept in a stationary position.
(2) If you open the scanner unit, put a sheet of document (or put a bound book opened) on the
glass of the scanner top cover, close the scanner unit, and start the scanning operation, then
the CCD drive mechanism will be driven. That is, the CCD motor rotates and its rotation will
be transmitted via the gear train to the CCD drive belt.
The CCD unit, which is supported and guided by the CCD rail, is secured to the CCD drive
belt. Clockwise and counterclockwise rotations of the CCD motor move the CCD unit to the
right and left, respectively.
In this scanning system, the CCD unit moves horizontally beneath a document being kept in
stationary position.
The CCD unit contains a charge coupled device (CCD) image sensor. The cold-cathode
fluorescent lamp illuminates a document and the reflected light of the scanned image data is
transmitted via the mirrors into the lens which reduces the scanned data so as to form the image
on the CCD.
III - 4
2.2 Ink Jet Printing Mechanism
2.2.1 Paper pick-up, registration, feeding, and ejecting mechanisms
The paper pick-up, registration, feeding, and ejecting mechanisms are driven by a single paper
feed motor.
III - 5
2.2.2 Ink jet printing and capping mechanisms
(1) Print head
This equipment uses drop-on-demand ink jet printing. The print head has four ink-jet units for four
color inks, each of which consists of 64 nozzles, 64 channels sandwiched by a pair of piezoelectric
ceramic actuators (PZT), manifold, and filter.
If a drive voltage* is applied to the electrodes formed on the surface of the piezoelectric actuators,
those actuators will be distorted as shown with broken lines in the illustration given below so that
the ink in the manifold will be vacuumed out to the channel.
(*The controller switches the drive voltage between 28 levels within 13.7V to 29.4V ±3%
depending upon the ambient temperature detected by the head thermistor.)
If deenergized, the piezoelectric actuators return to the previous form so as to apply pressure to
the ink in the channel, causing the ink to jet out through the nozzle. The jetted-out ink drop will be
splashed and produce a dot on paper held by the platen.
As the carriage holding the print head travels at the printing speed, the character generator sends
print command pulses to the circuits driving the piezoelectric actuators embedded in the print
head.
For the head thermistor and the head property EEPROM, refer to Section 2.3.
III - 6
(2) Ink cartridge
The equipment uses four ink cartridges (black, yellow, cyan, and magenta) of disposable type to
supply ink to the print head. As shown below, an ink cartridge contains an ink-impregnated
urethane foam. If ink-jet print operation or purging operation takes place, ink comes out of the
urethane foam and is supplied to the print head through the ink room, filters, and manifold.
For the ink cartridge sensors on the carriage PCB, refer to Section 2.3.
III - 7
(3) Head cap
Shown below is a head cap which prevents the nozzles of the print head from drying up when they
are not in use.
Upon completion of printing, the carriage travels to the right and moves the head cap provided on
the purge unit together. On the bottom of the head cap is a tab which is lead by the head cap
guide of the purge unit. Accordingly, the rightward movement brings the head cap up to the
position where the head cap comes into tight contact with the print head so as to cap the nozzles.
III - 8
2.2.3 Purging mechanism
The purging mechanism is driven by the paper feed motor located at the left side of the main
chassis. The rotation of the paper feed motor is transmitted to the paper feed roller. At the right
end of the paper feed roller, the rotational torque is further transmitted via the arm 12.3 ASSY
located on the main chassis to the gear train (including the sun gear 16/32 and planet gear 20) on
the PF side frame R.
If the carriage travels from the left to right to reach the purge position, the lower left tab provided
on the back of the carriage turns fin "x" of the purge lever counterclockwise (when viewed from the
top), so the bottom end of the purge lever releases the purge switching arm. Accordingly, the
planet gear 20 will be engaged with the gear 20 and the rotational torque of the paper feed motor
will drive the purge cam.
On the contrary, if the carriage travels from the purge position to the left, the upper right tab on the
back of the carriage turns fin "y" of the purge lever clockwise. The purge lever’s bottom end
pushes down the purge switching arm so that the planet gear 20 will be disengaged from the gear
20. The sun gear 16/32 will simple idle.
That is, when the carriage is in printing operation or the purge cam is in the home position, no
rotation of the paper feed motor is transmitted to the purge gear train; when the carriage is in the
purge position, the motor rotation is transmitted to the purge gear train which rotates the purge
cam.
III - 9
The purge cam is so designed that:
- the carriage lock pops out to lock the carriage before purging and pops in before cleaning with
the wiper,
- the purge cap comes out and becomes pressed against the nozzle ends of an ink-jet unit,
- the pump works to draw out ink from the head nozzles and drains it into the ink absorbers,
and
- the head wiper comes out to clean the nozzle surface.
A sequence of the above operations is carried out by one rotation of the purge cam. The home
position of the purge cam is detected by the HP switch. For the purge cam HP switch, refer to
Section 2.3.
(1) Carriage lock
If the purge cam is driven, the carriage lock of the purge unit pops out and locks the carriage to
align a particular ink-jet unit with the purge cap during purging operation. After purging but before
cleaning with the wiper, it pops in to release the carriage. When the power is off, the carriage lock
keeps the print head pressed against the head cap.
(2) Pressing the purge cap against the nozzle ends
The purge cap comes out and becomes pressed against the nozzle ends of an ink-jet unit.
(3) Purging
If activated, the pump draws out ink from the head nozzles and drains it into the ink absorbers to
remove air bubbles or dust from the inside of the nozzles and channels.
(4) Cleaning with the head wiper
After purging operation, the wiper comes out and the carriage moves from the right to left so as to
clean ink remaining on the head surface.
III - 10
2.2.4 Carriage drive mechanism
The carriage motor controls horizontal motion. The motor rotation is transmitted via the motor
pulley to the CR drive belt.
The carriage, which is supported and guided by the carriage rail, is secured to the CR drive belt.
Clockwise and counterclockwise rotations of the carriage motor move the carriage to the right and
left, respectively.
On the back of the carriage is the carriage encoder which tells the control circuitry the current
carriage position counted based on the carriage home position by using the encoder strip attached
to the main chassis.
III - 11
2.3 Sensors and Actuators
This equipment has the following sensors and thermistor.
Sensor name Type Located on
Document front sensor
Document rear sensor
Cover sensor Photosensor Cover sensor PCB on the scanner base
CCD HP sensor Photosensor Scanner base
Registration sensor
Paper width sensor
Paper ejection sensor
Cassette sensor
Ink cartridge sensors Mechanical switches Carriage PCB
Black ink empty sensor Photosensor Carriage PCB
Carriage encoder Photosensor Carriage PCB
Head thermistor Thermistor Carriage PCB
Head property EEPROM Print head unit (Head PCB)
Purge cam HP switch Mechanical switch Purge cam (→Main PCB)
Photosensor Document sensor PCB
Photosensor Paper width/registration sensor PCB on the
upper paper chute
Photosensor Paper ejection/cassette sensor PCB on the
lower paper chute
• Document front sensor which detects the presence of documents.
• Document rear sensor which detects the leading and trailing edges of pages to tell the control
circuitry when the leading edge of a new page has reached the starting position and when the
scan for that page is over.
• Cover sensor which detects whether the scanner unit is closed.
• CCD HP sensor which detects whether the CCD unit is in the home position.
• Registration sensor which detects the leading and trailing edges of paper, which allows the
controller to determine the registration timing.
• Paper width sensor which detects whether the paper width is A4-size or wider.
• Paper ejection sensor which detects whether the paper goes out of the equipment.
• Cassette sensor which detects whether the paper cassette is loaded.
• Ink cartridge sensors, each of which detects whether an ink cartridge is loaded.
• Black ink empty sensor which detects whether the black ink cartridge is empty.
• Carriage encoder which detects the current carriage position and carriage travel speed. If the
carriage travel speed varies abnormally, the controller regards it as a paper jam.
III - 12
• Head thermistor which allows the controller to control the temperature of the print head.
According to the change of the thermistor's internal resistance monitored, the control circuitry
regulates the drive voltage applied to the head’s piezoelectric ceramic actuators since the
viscosity of the ink varies depending upon the temperature. If the head thermistor detects
5.5°C or below, or 48°C or higher after two hours of powering-on state, the equipment stops
printing and stores print data into the DRAM.
• Head property EEPROM which stores the head property information. If you set the print head
unit on the carriage, the control circuitry on the main PCB reads the information and regulates
the drive voltage applied to the head’s piezoelectric ceramic actuators.
• Purge cam HP switch which detects whether the purge cam is in the home position.
The above photosensors are a photointerrupter consisting of a light-emitting diode and a lightsensitive transistor. Each of them has an actuator separately arranged as shown on the next
page.
III - 13
Location of Sensors and Actuators
III - 14
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