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 adjustment—so that service
personnel will be able to understand equipment function, to rapidly repair the equipment and
order any necessary spare parts.
T o 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 five chapters and appendices.
CHAPTER I
CHAPTER II
CHAPTER III.THEORY OF OPERATION
CHAPTER IV.INDICATION AND INFORMATION PRINTOUT OF ERROR
CHAPTER V.MAINTENANCE
APPENDICESCircuit Diagrams
.
GENERAL DESCRIPTION
.
INSTALLATION
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.
The figure below shows the equipment appearance and approximate dimensions.
121 (H)
1.2Components
The equipment has the following components:
Facsimile
Equipment
377 (W)
Electronic/
Electrical/
Section
Mechanical
Section
304 (D)
(Unit: mm)
Main PCB
NCU PCB
Control Panel PCB
Recording Head Unit
LED Array (for illuminating documents)
Charge Coupled Device (CCD) Unit
Sensors
Power Supply PCB
Recorder & Cutter Unit
CCD Unit
Drive Motor
Clutch Solenoid
(for paper & document feed and for cutter drive)
Package
Accessories
Drive Gears
Control Panel Unit
Covers
Automatic Document Feeder (ADF)
Handset
Frame and Miscellaneous Parts
I – 1
2.SPECIFICATIONS
ModelFAX100FAX615FAX625FAX635FAX675
Color1138BN4BN2BN4BN2
Modem Speed9600 bps9600 bps9600 bps9600 bps9600 bps
Coding MethodMHMHMHMHMH
Transmission Speed15 sec15 sec15 sec15 sec15 sec
CCITT GroupG3G3G3G3G3
Input/Output Width8.5"/8.5"8.5"/8.5"8.5"/8.5"8.5"/8.5"8.5"/8.5"
Auto CutterYesYesYesYesYes
ADF Capacity (pages)1515151515
Anti-curl SystemYesYesYesYesYes
Paper Size
LCD Size16 x 116 x 116 x 116 x 116 x 1
On-screen ProgrammingYesYesYesYesYes
Super FineYesYesYesYesYes
SmoothingYesYesYesYesYes
Gray Scale3232326464
One-touch Dialing10x21010x210x210x2
Speed Dialing2030203040
Group DialingNoNoNoNoNo
Telephone IndexNoNoNoNoNo
SpeakerphoneMonitorMonitorMonitorMonitorMonitor
Fax/Tel SwitchYesYesYesYesYes
TAD InterfaceYesYesYesYesYes
Enhanced Remote ActivationYesYesYesYesYes
Distinctive RingingYesYesYesYesYes
Next-Fax ReservationYesNoYesYesYes
HelpYesYesYesYesYes
Caller IDNoNoNoNoYes
Automatic RedialingYesYesYesYesYes
Multi-Resolution TransmissionYesY esYesYesYes
PollingStd/Sec/DelStd/Sec/DelStd/Sec/DelStd/Sec/DelStd/Sec/Del
Delayed TransmissionYes, 1 timerYes, 1 timerYes, 1 timerYes, 1 timerYes, 1 timer
CoverpageYesYesYesYesYes
Call ReservationYesYesYesYesYes
Call Back MessageYesYesYesYesYes
Activity ReportYesYesYesYesYes
Transmission Verification ReportYesYesYesYesYes
Page MemoryNoNoNoNoNo
ECMNoNoNoNoNo
BroadcastingNoNoNoNoNo
Quick ScanningNoNoNoNoNo
Out-of-Paper ReceptionNoNoNoNoNo
Multi CopyNoNoNoNoNo
Multi TransmissionNoNoNoNoNo
TAD T ypeNoNoNoNoNo
ICM Recording TimeNoNoNoNoNo
Remote ControlNoNoNoNoNo
PagingNoNoNoNoNo
Toll SaverNoNoNoNoNo
Memo/2-Way RecordingNoNoNoNoNo
Time/Date StampNoNoNoNoNo
Message CenterNoNoNoNoNo
OGMNoNoNoNoNo
FAX ForwardingNoNoNoNoNo
FAX RetrievalNoNoNoNoNo
PCI (Missing link)
PasswordNoNoNoNoNo
Paper SaveNoNoNoNoNo
Day-Night ModeNoNoNoNoNo
Elec. Vol. ControlNoNoNoNoNo
FAX-on-demandNoNoNoNoNo
Voice-on-demandNoNoNoNoNo
Fax Mail BoxNoNoNoNoNo
Voice Mail BoxNoNoNoNoNo
(Standard thermal/Therma PLUS)
(* : w/o PC FAX RX)
164'/164'164'/164'164'/164'164'/164'164'/164'
No(Note 1)(Note 1)Option*Option*
(Note 1)No:Asia and Taiwan
Option*: Gulf, China, and Saudi Arabia
I – 2
ModelFAX715MFAX725MFAX825MCFAX875MC
ColorBN2BN4BN2BN2
Modem Speed9600 bps14400 bps14400 bps14400 bps
Coding MethodMHMHMHMH
Transmission Speed15 sec9 sec9 sec9 sec
CCITT GroupG3G3G3G3
Input/Output Width8.5"/8.5"8.5"/8.5"8.5"/8.5"8.5"/8.5"
Auto CutterYesYesYesYes
ADF Capacity (pages)15151515
Anti-curl SystemYesYesYesYes
Paper Size
LCD Size16 x 116 x 116 x 116 x 1
On-screen ProgrammingYesYesYesYes
Super FineYesYesYesYes
SmoothingYesYesYesYes
Gray Scale64646464
One-touch Dialing10x210x210x210x2
Speed Dialing40404080
Group Dialing6666
Telephone IndexYesYesYesYes
SpeakerphoneMonitorMonitorMonitorMonitor
Fax/Tel SwitchYesYesYesYes
TAD InterfaceYesYesYesYes
Enhanced Remote ActivationYesYesYesYes
Distinctive RingingYes(Note 2)Yes(Note 3)
Next-Fax ReservationYesYesYesYes
HelpYesYesYesYes
Caller IDYes(Note 2)Yes(Note 3)
Automatic RedialingYesYesYesYes
Multi-Resolution TransmissionYesYesYesYes
PollingStd/Sec/DelStd/Sec/DelStd/Sec/Del/SeqStd/Sec/Del/Seq
Delayed TransmissionYes, 3 timersYes, 3 timersYes, 3 timersYes, 3 timers
CoverpageYesYesYesYes
Call ReservationYesYesYesYes
Call Back MessageYesYesYesYes
Activity ReportYesYesYesYes
Transmission Verification ReportYesYesYesYes
Page Memory10 pages10 pages50 pages50 pages
ECMYesYesYesYes
BroadcastingYesYesYesYes
Quick ScanningYesYesYesYes
Out-of-Paper ReceptionYesYesYesYes
Multi CopyYes, w/sortYes, w/sortYes, w/sortYes, w/sort
Multi TransmissionYesYesYesYes
TAD TypeNoNoIC DigitalIC Digital
ICM Recording TimeNoNo(18 min)(18 min)
Remote ControlNoNoFullFull
PagingNoNoYesYes
Toll SaverNoNoYesYes
Memo/2-Way RecordingNoNoYesYes
Time/Date StampNoNoYesYes
Message CenterNoNoYesYes
OGMNoNoYesYes
FAX ForwardingNoNoYesYes
FAX RetrievalNoNoYesYes
PCI (Missing link)
PasswordNoNoNoNo
Paper SaveNoNoNoNo
Day-Night ModeNoNoNoNo
Elec. Vol. ControlNoNoNoNo
FAX-on-demandYesYes
Voice-on-demandNoNoYesYes
Fax Mail BoxNoNoYes, 5Yes, 5
Voice Mail BoxNoNoYes, 5Yes, 5
Input/Output WidthA4/A4A4/A4A4/A4
Auto CutterYesYesYes
ADF Capacity (pages)151515
Anti-curl SystemYesYesYes
Paper Size
LCD Size16 x 116 x 116 x 1
On-screen ProgrammingYesYesYes
Super FineYesYesYes
SmoothingYesYesYes
Gray Scale326464
One-touch Dialing10x210x210x2
Speed Dialing404040
Group DialingNone66
Telephone IndexNoYesYes
SpeakerphoneNoNoNo
Fax/Tel SwitchYesYesYes
TAD InterfaceYesYesYes
Enhanced Remote ActivationYesYesYes
Next-Fax ReservationYesYesYes
HelpYesYesYes
Caller IDUK/Holland/SwedenUKUK/Holland/Sweden
Automatic RedialingYesYesYes
Multi-Resolution TransmissionYesYesYes
PollingStd/Sec/DelStd/Sec/DelStd/Sec/Del/Seq
Delayed TransmissionYes, 1 timerYes, 3 timersYes, 3 timers
CoverpageYesYesYes
Call ReservationYesYesYes
Call Back MessageYesYesYes
Journal Report (Activity Report)YesYesYes
Transmission Verification ReportYesYesYes
Page Memory (Brother chart)No10 pages55 pages
ECMNoYesYes
BroadcastingNo6060
Quick ScanningNoNoNo
Out-of-Paper ReceptionNoYesYes
Multi CopyNoYes, w/stack & sortYes, w/stack & sort
Multi TransmissionNoYesYes
TAD TypeNoNoIC Digital
ICM Recording TimeNoNo13 min
Remote ControlNoNoYes
PagingNoNoYes
Toll SaverNoNoYes
Time/Date StampNoNoYes
Message CenterNoNoYes
OGMNoNoYes
FAX ForwardingNoNoYes
FAX RetrievalNoNoYes
Connect 5000 Connectivity
(PCI or Missing link)
Backup for VoiceNoNo6 hours
Backup for Page MemoryNoNo6 hours
Backup for Clock15 hours15 hours15 hours
PasswordNoNoNo
FAX-on-demandNoNoUp to 50 messages
Voice-on-demandNoNoUp to 50 messages
2.1Transmitting Mechanism (Feeding and Scanning Documents)
The transmitting mechanism consists of the document stacker, automatic document feeder
(ADF), document feeding related rollers, scanner, and document sensors. (For details about
the sensors, refer to Section 2.3.)
If the operator sets documents on the stacker and starts the sending operation, the ADF
feeds those documents into the equipment, page by page. Each document advances with
the separation roller to the scanner, and then it is fed out of the equipment with the LF roller.
For the drive power source, refer to Section 2.4.
Roller (mounted on
Document
Separation roller ASSY
the panel rear cover)
LF roller ASSY
2.1.1Automatic document feeder (ADF)
The ADF, which consists of the separation roller and separator, feeds documents set on the
document stacker, starting from the bottom sheet to the top, page by page, due to the frictional difference among the separation roller, the documents, and the separator.
2.1.2Scanner
The scanner uses a charge coupled device (CCD) image sensor.
As shown below, the LED array 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.
Lens
Pressure roller
Separation roller ASSY
(Front)
Bar lens
CCD PCB
Mirror
(Front)
MirrorsLED array
III – 2
2.2Receiving Mechanism (Feeding Recording Paper & Recording Data)
The receiving mechanism consists of the recording paper roll holder, anti-curl system (ACS),
platen, thermal recording head, automatic cutter, and sensors. (For details about the sensors, refer to Section 2.3.)
The recording paper is routed through the ACS to the recording head which prints onto the
heat-sensitive recording paper pressed by the platen according to received image signals.
The printed paper is further fed through the cutter chute and cut by the automatic cutter page
by page.
For the drive power source, refer to Section 2.4.
Upper blade
Lower blade
(Rear)
2.2.1Anti-curl system (ACS)
The ACS eliminates curl peculiar to the rolled recording paper by curving the paper towards
the opposite side of the curl with the ACS rod and the ACS plate.
Cutter chute
Platen
Recording
head
ACS rod
ACS plate
Recording paper roll
2.2.2Automatic cutter
The automatic paper cutter consists of an upper blade (rotary) and a lower blade (stationary). As the upper blade rotates around the left end as a support, the recording paper will be
cut. Upon completion of cutting operation, the upper blade returns to the home position
which is detected by the cutter sensor.
III – 3
2.3Sensors
This equipment has two photosensors and four mechanical sensors as described below.
Photosensors
• Document front sensor which detects a 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.
These two photosensors are located on the main PCB. They are of a reflection type consisting of a light-emitting diode and a light-receiving transistor. Each of them has an actuator
separately arranged (see the next page). If an actuator is activated, its white end will come
to the path of light issued from the light-emitting diode and reflect its light. The moment the
reflected light enters the light-receiving transistor, the sensor signals the detection.
Mechanical sensors
• PE (paper empty) sensor which detects whether the recording paper is present.
• Cover sensor which detects whether the recording paper cover is closed.
• Cutter sensor which detects the home position of the upper rotary blade of the automatic
cutter.
• Hook switch sensor which detects whether the handset is placed on the handset mount.
These four sensors are located on the NCU PCB. Each of them has an actuator separately
arranged (see the next page). If an actuator is activated, its lower end pushes down the lever provided on the corresponding sensor so that the sensor signals the detection.
(Rear)
NCU PCB
Cutter sensor
Hook switch
sensor
Cover sensor
SW3
SW4
SW2
PH1 PH2
Main PCB
SW1
PE sensor
Approx.
0.7 mm
Power supply PCB
Path of
actuator's end
Glass
Document rear sensor
Document front sensor
III – 4
Lightemitting
diode
Lightreceiving
transistor
PE sensor
actuator
Document front
sensor actuator
(Front)
Document rear sensor actuator
Drive unit
Cutter sensor
actuator
(Front)
Cover sensor actuator
Hook switch
sensor actuator
Location of Sensor Actuators
III – 5
2.4Power Transmission Shift by the Planetary Gear Train and Clutch Solenoid
The equipment has a single drive motor whose power transmission route can be switched by
the planetary gear train and the clutch solenoid. Accordingly, the equipment mechanism can
function in four operation modes (recording, scanning, copying, and cutter driving modes).
2.4.1Description of planetary gear train
The planetary gear train consists of the sun gear 18/73, two planet gears 20, arm A, and arm
B, as shown below.
Arm B
Sun gear 18/73
Arm A
Planet gear 20B
Sun gear 18/73
Motor gear
Arm A
Planet gear 20A
Planet gear 20A
Planet gear 20B
Arm B
Stopper of arm A
If the motor rotates, the sun gear 18/73 rotates so that the rotational force is transmitted to
the engagement between the sun gear and the planet gears 20. Since the arms and planet
gears are so designed that the moment of the arms is less than that of the planet gears, the
arms turn around the center shaft in the same direction as the sun gear 18/73.
If the planet gear(s) becomes engaged with any other gear so that the arm cannot turn furthermore, the rotational force of the sun gear 18/73 is transmitted to that planet gear. Accordingly, the planet gear starts rotation in the opposite direction of the sun gear 18/73.
III – 6
2.4.2Power transmission for four operation modes
Depending upon the clutch solenoid ON/OFF state and the motor rotation direction, the planetary gear train switches the power transmission route for the four operation modes.
Section Y
Cutout X
Clutch lever
Section Y
Cutout X
(engaged
with stopper
of arm A)
[ 1 ] Recording mode (Solenoid: OFF, Motor rotation: Forward)
Solenoid: ON
Solenoid: OFF
Spring
Solenoid
Motor gear
Arm A
Sun gear 18/73
Arm B
Planet gear
20B
Stopper of arm A
Planet gear 20A
Forward
Reverse
In the recording mode, the control system deactivates the clutch solenoid (see the above figure, Solenoid: OFF). Therefore, when the motor rotates in the forward direction, the clutch
lever turns clockwise with the spring and its cutout X becomes engaged with the stopper of
arm A. Once arm A is locked, the planet gear 20A (C2) will not be engaged with any other
gear but simply idle.
The motor rotation turns the sun gear 18/73 (B) counterclockwise so that the planet gear 20B
(C1) transmits the rotation to the platen gear (E) via the gear D.
B (Sun gear
18/73)
E (Platen gear)
A (Motor gear)
C1 (Planet gear 20B)
D
F
Cutout X of
clutch lever
C2 (Planet
gear 20A)
(Front)
Clutch
solenoid
III – 7
[ 2 ] Scanning mode (Solenoid: OFF, Motor rotation: Reverse)
Just as in the recording mode, the control system deactivates the clutch solenoid in the
scanning mode to lock arm A.
The motor rotates in the reverse direction and the sun gear 18/73 (B) rotates clockwise so
that the planet gear 20A (C2) transmits the rotation to the separation roller gear (L) and LF
roller gear (O) via the several gears.
C2 (Planet
gear 20A)
I
B (Sun gear
18/73)
A (Motor gear)
[ 3 ] Copying mode (Solenoid: ON ➞ OFF, Motor rotation: Forward)
F
Cutout X of
clutch lever
H
J
G
Clutch solenoid
K
L (Separation
roller gear)
M
(Front)
N
O (LF roller
gear)
The control system at first activates the clutch solenoid to release the stopper of arm A from
coutout X of the clutch lever while rotating the motor in the forward direction. Accordingly,
the sun gear 18/73 (B) rotates counterclockwise so that both the planet gears 20B (C1) and
20A (C2) transmit the rotation to the platen gear (E) and the roller gears (separation roller
gear and LF roller gear), respectively.
Once the planet gear 20A becomes engaged with the gear P, the control system deactivates
the clutch solenoid.
B (Sun gear
18/73)
A (Motor gear)
E (Platen gear)
C2 (Planet gear 20A)
C1 (Planet gear 20B)
D
H
G
F
P
Clutch lever
I
III – 8
K
J
L (Separation
roller gear)
M
(Front)
N
O (LF roller
gear)
[ 4 ] Cutter driving mode (Solenoid: ON, Motor rotation: Reverse)
B (Sun gear
18/73)
Q (Cutter
gear)
The control system activates the clutch solenoid to release the stopper of arm A from cutout
X of the clutch lever. When the motor rotates in the reverse direction, the sun gear 18/73
(B) rotates clockwise so that the planet gear 20A (C2) transmits the rotation to the cutter
gear (Q).
Since the planet gear 20B (C1) is blocked by section Y of the clutch lever, it remains idling
without engaging with any other gear.
C1 (Planet gear 20B)
Section Y of clutch lever
(Front)
C2 (Planet gear 20A)
III – 9
2.4.3Power transmission route
Rotation of the motor gear is transmitted as shown below.
[ 1 ] Recording Mode (Solenoid: OFF, Motor rotation: forward)
C1 ➔ D ➔ E
A ➔ B
C2 (idling)
[ 2 ] Scanning Mode (Solenoid: OFF, Motor rotation: reverse)
C1 (idling)
A ➔ B
C2 ➔ F ➔ G ➔ H ➔ I ➔ J ➔ K ➔ L ➔ M ➔ N ➔ O
[ 3 ] Copying Mode (Solenoid: ON ➔ OFF, Motor rotation: forward)
C1 ➔ D ➔ E
A ➔ B
C2 ➔ P ➔ F ➔ G ➔ H ➔ I ➔ J ➔ K ➔ L ➔ M ➔ N ➔ O
[ 4 ] Cutter Driving Mode (Solenoid: ON, Motor rotation: reverse)
C1 (idling)
A ➔ B
C2 ➔ Q
III – 10
3.CONTROL ELECTRONICS
3.1Configuration
The hardware configuration of the facsimile equipment is shown below.
Speaker
Motor
Handset
Solenoid
Line
2-pin8-pin
2-pin
4-pin
NCU PCB
(See NOTE
below.)
Main PCB
2-pin
6-pin
2-pin
12-pin
2-pin
26-pin
FAX
engine
LED array
Thermal recording head
NOTE: The FAX engine includes a CPU and gate array. In the FAX100/570/
615/625/635/675/575M/715M, it also includes a MODEM.
*1 On the NCU PCB are the
following switches:
PC
• PE sensor (SW1)
• Cover sensor (SW2)
• Cutter sensor (SW3)
• Hook switch sensor (SW4)
*
Power
8-pin
supply
PCB
*1
2 On the main PCB are the
following photosensors:
• Document front sensor
(PH1)
• Document rear sensor (PH2)
14-pin
5-pin
LCD
LEDs
*2
10-pin
CCD
PCB
13-pin
FPC key
3.2Main PCB
The main PCB, which is the nucleus controlling the entire operation of the equipment, consists of a FAX engine (ASIC), memories, MODEM (except for FAX100/570/615/625/635/675/
575M/715M)
recording, and power transmission switching.
NCU and
Power supply
Speaker
LED array and
CCD PCB
Configuration of Facsimile Equipment
, motor drive circuitry, sensor detection circuitry, and analog circuits for scanning,
ROM
E2PROM
DRAM
Image
processor
FAX
engine
(ASIC)
Motor
driver
Sensors
Control panel
Recording head
Motor
PCI
E2PROM:Electrically Erasable Programmable Read-only Memory
DRAM:Dynamic Random Access Memory
Block Diagram of Main PCB
III – 11
3.2.1FAX100/570/615/625/635/675/575M/715M
[ 1 ]Primary function group
Main PCB Circuit Diagram 1/4
1 FAX engine (ASIC) which integrates a CPU, MODEM and gate array
2 Clock for MODEM
3 Clock for CPU
4 Clock for calendar clock
5 Reset IC
6 LED array light intensity control circuit and connector
7 Recording head drive voltage detector
8 Control panel connector
III – 12
[ 2 ]ROM and DRAM group
Main PCB Circuit Diagram 2/4
1 ROM (2-megabit. Note that the sample machines for demonstration have a 4-
megabit ROM.)
2 E2PROM (16-kilobit)
3 DRAM (256-kilobit) for the FAX100/570/615/625/635/675
4 DRAMs (256-kilobit) for the FAX575M/715M
III – 13
[ 3 ]Image processing group
Main PCB Circuit Diagram 3/4
1 Image processor (Image processing IC)
2 Connector for the CCD PCB
3 Recording head temperature detector and head connector
4 Motor driver and connector
5 Clutch solenoid connector
6 Document front sensor (photosensor)
7 Document rear sensor (photosensor)
III – 14
[ 4 ]Analog signal processing group
Main PCB Circuit Diagram 4/4
1 Analog front end IC
Processes the analog I/O signals from/to the MODEM.
2 Main-NCU connector
3 Analog signal selectors
3-1: Selects either RL1 or RL2 signals inputted from the communications net-
work.
3-2: Selects either input signals from the handset or those from the MODEM.
3-3: Selects either sound signals (e.g. alarm beeps, key clicks and ringer sounds)
generated by the FAX engine or signals selected by 3-1.
4 Amplifier circuit for signals outputted from the MODEM
5 Amplifier & shaper circuit for signals inputted from the communications network
6 Speaker amplifier circuit
Amplifies sounds issued from the above analog signal selector (3) and feeds them
to the speaker.
7 Speaker connector
III – 15
3.2.2FAX725M/590DT/590MC/825MC/875MC
[ 1 ]Primary function group
Main PCB Circuit Diagram 1/5
1 FAX engine (ASIC) which integrates a CPU and gate array.
2 Clock for CPU
3 Clock for calendar clock
4 ROM (2-megabit. Note that the sample machines for demonstration have a 4-
megabit ROM.)
5 E2PROM(16-kilobit in the FAX725M/590DT/590MC/825MC, 32-kilobit in the
FAX875MC)
6 Control panel connector
7 LED array light intensity control circuit and connector
8 Recording head drive voltage detector
III – 16
[ 2 ]DRAM group
Main PCB Circuit Diagram 2/5
1 DRAMs
FAX725M:Two 256-kilobyte DRAMs
FAX590DT/590MC/825MC/875MC: Two 512-kilobyte DRAMs
2 Calendar clock backup circuit (for the FAX725M)
3 DRAM backup circuit and nickel-hydrogen battery connector (for the FAX590DT/
590MC/825MC/875MC)
4 DRAM refresh circuit (for the FAX590DT/590MC/825MC/875MC)
5 Reset IC
III – 17
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