Brother FAX 1170 User manual

FACSIMILE EQUIPMENT
SERVICE MANUAL
MODEL: FAX[phone]MC
FAX[phone]
MFC1770/1870MC/1970MC

© Copyright Brother 1997
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 opera-
tion, 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.
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.
12
ABC
Hook
Hold
Function Tel/Index Resolution Mode Super
O. Scan Help
Redial/Pause
Speed Dial
3
DEF
01 02 03 04
13 14 15 16
05 06 07 08
17 18 19 20
09 10 11 12
21 22 23 24
4
GHI
5
JKL
6
MNO
7
PRS
8
TUV
9
WXYZ
*
0
#
Shift
Set Clear
Copy
Enlarge/
Reduce
Sort
Stop Start
IntelliFAX-1270
PLAIN PAPER FACSIMILE
A4 8.5"
A4
8.5"
(Unit: mm)
213 (H)
385 (D) * 317 mm for FAX1010 which has
no handset mount
385.5 (W)*
Weight: Machine proper FAX1010: Approx. 5.0 kg (excluding a ribbon cartridge)
Other models: Approx. 5.2 kg (excluding a ribbon cartridge)
In package FAX1010: Approx. 8.7 kg
Other models: Approx. 8.9 kg
1.2 Components
The equipment consists of the following major components:
Recording paper cover ASSY
Control panel
ASSY
Inner cover
Recording head
ASSY
Main frame
Handset
(Not provided on
the FAX1010)
Main cover
CIS unit
Document
ejection tray
Bottom plate
Modular PCB
Power supply PCB
NCU PCB
Main PCB
Handset mount
(Not provided on
the FAX1010)
Side cover
(Provided only on
the FAX1010)

I – 2
2. SPECIFICATIONS
FAX Retrieval No Yes Yes
PCI (Missing link) Ready Ready Ready
Message Center No No Yes
Caller ID Yes Yes Yes
Fax-/Voice-on-demand No No Voice-on-demand
Mail Box No No Yes
Remote Control Yes Yes Yes
Toll Saver No No Yes
Memo/2-Way Recording No No Yes
Auto Reduction Yes Yes Yes
Confidential Mailbox No No No
Optional Memory No No No
Model FAX1170 FAX1270 FAX1570MC
Color Gray (1395) White (1397) White (1397)
Modem Speed 9600 bps 9600 bps 14400 bps
CCITT Group G3 G3 G3
Coding Method MH MH MH
Transmission Speed 15 sec. 15 sec. 9 sec.
Input/Output Width 8.5"/8.5" 8.5"/8.5" 8.5"/8.5"
ADF Capacity (pages) 20 20 20
Recording Paper Loadable 200 sheets 200 sheets 200 sheets
Paper Size Letter/Legal/A4 Letter/Legal/A4 Letter/Legal/A4
Ribbon Life (Letter-size print) 450 pages 450 pages 450 pages
Handset Yes Yes Yes
LCD Size 16 x 1 16 x 1 16 x 1
On-screen Programming Yes Yes Yes
Gray Scale 64 by Dithered 64 by Dithered 64 by E/D
Smoothing Yes Yes Yes
One-touch Dial 12 x 2 12 x 2 12 x 2
Speed Dial 26 36 100
Telephone Index Yes Yes Yes
Multi-resolution Transmission Yes Yes Yes
FAX/TEL Switch Yes Yes Yes
Distinctive Ringing Yes Yes Yes
Next Fax-reservation Yes Yes Yes
Help Yes Yes Yes
TAD Interface Yes Yes Yes
Coverpage Yes, Super Yes, Super Yes, Super
Polling Type Sim/Del/Seq Sim/Del/Seq Sim/Del/Seq
Receive Password (password plus) Yes Yes Yes
Delayed Transmission 3, timers 3, timers 3, timers
Call Reservation Yes Yes Yes
Call-back Message Yes Yes Yes
Speaker Phone Monitor Monitor Yes, Full-duplex
Activity Report Yes Yes Yes
Transmission Verification Report Yes Yes Yes
Page Memory 512 KB (20 pages) 512 KB (20 pages) 1 MB (50 pages)
Out-of-paper Reception Yes Yes Yes
Quick Scan Yes Yes Yes
Super Quick Scan No No No
Broadcasting Yes Yes Yes
ECM Yes Yes Yes
Multi-transmission Yes Yes Yes
Multi-copying w/Sorting Yes Yes Yes
Enlargement/Reduction Ratio Yes (50-150%) Yes (50-150%) Yes (50-150%)
TAD Type No No DSP
OGM No No Yes
ICM Recording Time No No Yes, 30 min.
FAX Forwarding/Paging No Yes Yes

I – 3
FAX Retrieval Yes Yes Yes
PCI (Missing link) Ready Ready Ready
Message Center No No Yes
Caller ID UK, Sw., Holland (Ready for France) UK, Sw., Holland (Ready for France) UK, Sw., Holland (Ready for France)
Fax-/Voice-on-demand No No Voice-on-demand
Mail Box No No Yes, 5
Remote Control Yes Yes Yes
Toll Saver No No Yes
Memo/2-Way Recording No No Yes
Auto Reduction Yes Yes Yes
Confidential Mailbox No No No
Optional Memory No No No
Model FAX1010 FAX1020 FAX1030
Color White (1138) White (1138) White (1138)
Modem Speed 9600 bps 9600 bps 14400 bps
CCITT Group G3 G3 G3
Coding Method MH MH MH
Transmission Speed 15 sec. 15 sec. 10 sec.
Input/Output Width A4/A4 A4/A4 A4/A4
ADF Capacity (pages) 20 20 20
Recording Paper Loadable 200 sheets 200 sheets 200 sheets
Paper Size Letter/Legal/A4 Letter/Legal/A4 Letter/Legal/A4
Ribbon Life (A4-size print) 420 pages 420 pages 420 pages
Handset No Yes Yes
LCD Size 16 x 1 16 x 1 16 x 1
On-screen Programming Yes Yes Yes
Gray Scale 64 by Dithered 64 by Dithered 64 by E/D
Smoothing Yes Yes Yes
One-touch Dial 12 x 2 12 x 2 12 x 2
Speed Dial 36 36 100
Telephone Index Yes (Not Super) Yes (Not Super) Yes (Not Super)
Multi-resolution Transmission Yes Yes Yes
FAX/TEL Switch Yes Yes Yes
Distinctive Ringing Yes Yes Yes
Next Fax-reservation Yes Yes Yes
Help Yes, Simple Yes, Simple Yes, Simple
TAD Interface Yes Yes Yes
Coverpage Yes, Super Yes, Super Yes, Super
Polling Type Std/Sec/Del/Seq Std/Sec/Del/Seq Std/Sec/Del/Seq
Receive Password (password plus) Yes Yes Yes
Delayed Transmission 3, timers 3, timers 3, timers
Call Reservation Yes Yes Yes
Call-back Message Yes Yes Yes
Speaker Phone Monitor Monitor Yes, Full-duplex
Activity Report Yes Yes Yes
Transmission Verification Report Yes Yes Yes
Page Memory 512 KB (20 pages) 512 KB (20 pages) 1 MB (50 pages)
Out-of-paper Reception Yes (20 pages) Yes (20 pages) Yes (50 pages)
Quick Scan Yes (18 pages) Yes (18 pages) Yes (18 pages)
Super Quick Scan No No No
Broadcasting Yes, 60 locations Yes, 60 locations Yes, 124 locations
ECM Yes Yes Yes
Multi-transmission Yes Yes Yes
Multi-copying w/Sorting Yes Yes Yes
Enlargement/Reduction Ratio Yes (50-150%) Yes (50-150%) Yes (50-150%)
TAD Type No No DSP
OGM No No Yes
ICM Recording Time No No Yes, 30 min.
FAX Forwarding/Paging Yes/No Yes/No Yes

I – 4
FAX Retrieval Yes Yes Yes
PCI (Missing link) Included (MFL3) Included (MFL3) Included (MFL3)
Message Center No Yes Yes
Caller ID Yes Yes Yes
Fax-/Voice-on-demand No Voice-on-demand Voice-on-demand
Mail Box No Yes Yes
Remote Control Yes Yes Yes
Toll Saver No Yes Yes
Memo/2-Way Recording No Yes Yes
Auto Reduction Yes Yes Yes
Confidential Mailbox No No No
Optional Memory No No No
Model MFC1770 MFC1870MC MFC1970MC
Color White (1138) White (1138) White (1138)
Modem Speed 9600 bps 14400 bps 14400 bps
CCITT Group G3 G3 G3
Coding Method MH MH MH
Transmission Speed 15 sec. 9 sec. 9 sec.
Input/Output Width 8.5"/8.5" 8.5"/8.5" 8.5"/8.5"
ADF Capacity (pages) 20 20 20
Recording Paper Loadable 200 sheets 200 sheets 200 sheets
Paper Size Letter/Legal/A4 Letter/Legal/A4 Letter/Legal/A4
Ribbon Life (Letter-size print) 450 pages 450 pages 450 pages
Handset Yes Yes Yes
LCD Size 16 x 1 16 x 1 16 x 1
On-screen Programming Yes Yes Yes
Gray Scale 64 by Dithered 64 by Dithered 64 by E/D
Smoothing Yes Yes Yes
One-touch Dial 12 x 2 12 x 2 12 x 2
Speed Dial 36 36 100
Telephone Index Yes Yes Yes
Multi-resolution Transmission Yes Yes Yes
FAX/TEL Switch Yes Yes Yes
Distinctive Ringing Yes Yes Yes
Next Fax-reservation Yes Yes Yes
Help Yes Yes Yes
TAD Interface Yes Yes Yes
Coverpage Yes, Super Yes, Super Yes, Super
Polling Type Sim/Del/Seq Sim/Del/Seq Sim/Del/Seq
Receive Password (password plus) Yes Yes Yes
Delayed Transmission 3, timers 3, timers 3, timers
Call Reservation Yes Yes Yes
Call-back Message Yes Yes Yes
Speaker Phone Monitor Yes, Full-duplex Yes, Full-duplex
Activity Report Yes Yes Yes
Transmission Verification Report Yes Yes Yes
Page Memory 512 KB (20 pages) 512 KB (20 pages) 1 MB (50 pages)
Out-of-paper Reception Yes Yes Yes
Quick Scan Yes Yes Yes
Super Quick Scan No No No
Broadcasting Yes Yes Yes
ECM Yes Yes Yes
Multi-transmission Yes Yes Yes
Multi-copying w/Sorting Yes Yes Yes
Enlargement/Reduction Ratio Yes (50-150%) Yes (50-150%) Yes (50-150%)
TAD Type No DSP DSP
OGM No Yes Yes
ICM Recording Time No Yes, 15 min. Yes, 30 min.
FAX Forwarding/Paging Yes Yes Yes

CHAPTER II.
INSTALLATION

CHAPTER III.
THEORY OF OPERATION

CONTENTS
1. OVERVIEW.....................................................................................................III-1
1.1Functional Block Diagram...................................................................... III-1
2. MECHANISMS................................................................................................III-2
2.1Transmitting Mechanism (Feeding and scanning documents)............... III-2
2.1.1Automatic document feeder (ADF).................................................. III-2
2.1.2Scanner...........................................................................................III-3
2.2Receiving Mechanism (Feeding paper and printing data)...................... III-4
2.3Power Transmission Mechanism........................................................... III-5
2.3.1Structure of the gear train............................................................... III-5
2.3.2Description of planetary gear system.............................................. III-6
2.3.3Power transmission for four operation modes................................. III-7
[ 1 ]Scanning mode (Solenoid: OFF, Motor rotation : Reverse)...................... III-8
[ 2 ]Paper feeding/ejection mode (Solenoid: ON, Motor rotation : Reverse) III-9
[ 3 ]Recording mode (Solenoid: OFF, Motor rotation : Forward).................... III-10
[ 4 ]Copying mode (Solenoid: ON, Motor rotation : Forward)......................... III-12
2.3.4Power transmission route............................................................... III-14
2.4Sensors and Actuators........................................................................... III-16
3. CONTROL ELECTRONICS........................................................................... III-19
3.1Configuration...........................................................................................III-19
3.2Main PCB................................................................................................III-20
3.3NCU PCB................................................................................................III-27
3.4Control Panel PCB................................................................................. III-29
3.5Power Supply PCB................................................................................ III-30

III – 1
1. OVERVIEW
1.1 Functional Block Diagram
LCD
Control Panel
Main frame
Ribbon sensor
Recorder
Recording head
Ribbon cartridge
Motor
Scanner
To PC
CIS unit
Modular PCB
(Cover sensor)
Main PCB
(Document front
and rear sensors)
NCU PCB Line
AC
Power supply
PCB
Sensor PCB
(Paper-edge
sensor and paper
ejection sensor)
Handset
Hook switch
sensor
Document
ejection tray

III – 2
2. MECHANISMS
The equipment is classified into the following mechanisms:
■Transmitting Mechanism Feeding and scanning documents
■Receiving Mechanism Feeding paper and printing data
■Power Transmission Mechanism Switching the power transmission route
■Sensors and Actuators
2.1 Transmitting 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 2.4.)
For the drive power source, refer to Section 2.3.
2.1.1 Automatic document feeder (ADF)
If the operator sets documents on the stacker and starts the transmitting operation, the ADF
(consisting of the separation roller and ADF parts) feeds those documents into the equip-
ment, starting from the bottom sheet to the top, page by page. Each document advances to
the scanner, and then it is fed with the white pressure roller and document ejection roller.
Document
Document
stacker
Scanner
(CIS unit)
Pressure roller,
front
White pressure
roller
Pressure roller,
rear
ADF parts
Separation roller
Document
ejection roller
(Front)
Document
support

III – 3
2.1.2 Scanner
The scanner uses a contact image sensor (CIS) unit which consists of an LED array illumi-
nating 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 white pressure roller and the
cover glass, it is scanned.

III – 4
2.2 Receiving Mechanism (Feeding paper and printing data)
The receiving mechanism consists of the recording paper cover ASSY, paper feed roller
ASSY, platen, thermal recording head, paper ejection roller, and sensors. (For details about
the sensors, refer to Section 2.4.)
STEP 1: In the paper feeding mode
If the equipment receives data, the control electronics activates the solenoid and rotates the
motor counterclockwise to drive the paper feed roller (and paper ejection roller). This pulls in
a sheet of paper and feeds it until its leading edge reaches the point just before the printing
position.
STEP 2: In the recording (platen drive & ribbon take-up) mode
The control electronics deactivates the solenoid and rotates the motor clockwise to drive the
platen gear and the ribbon take-up gear as well as the paper ejection roller. This feeds the
paper up to the printing position where the thermal recording head prints, as well as feeding
the thermal ink ribbon.
STEP 3: In the paper ejecting mode
The same operation as for STEP 1 takes place so as to eject the paper.
Paper
Paper feed roller ASSY
Paper ejection roller
Platen
Chute ASSY
Thermal ink ribbon Recording head
(Front)
Recording
paper cover
ASSY

III – 5
2.3 Power Transmission Mechanism
The equipment has a single drive motor whose power transmission route can be switched by
the planetary gear systems and the solenoid. This switching allows the equipment to func-
tion in four operation modes (scanning, paper feeding/ejecting, recording, and copying
modes). For the details about the planetary gear systems, refer to Subsection 2.3.2.
2.3.1 Structure of the gear train
At the left side of the equipment, the rotational torque of the motor on the main frame is
transmitted to the gears on the main frame and then to the gears on the platen frame. These
gears drive the document feeding/ejecting related rollers, paper feeding/ejecting related roll-
ers, and the platen.
If the platen gear ("a" in the figure below) on the left end of the platen shaft rotates, the gear
33RB ("b") on the right end also rotates. This way, the rotational torque is transmitted to the
gears on the right side of the equipment.
At the right side of the equipment, the rotational torque is further transmitted via the friction
torque transmission ASSY to the ribbon drive gear ("e") which drives the ribbon take-up gear
in the ribbon cartridge.
Gear Train : Gears on the main frame
: Gears on the platen frame
Main frame Q (Gear 33) P (Gear 18)
B (Sun gear 20/90)
(Front)
F (Separation roller gear)
D (Gear 33)
C (Planet gear 20B of Arm BASSY)
M (Gear 39)
Z (Gear 33/45)
UV
T (Paper feed roller gear, Gear 55)
Platen frame
G H J
E (Gear
20/40)
K (Document
ejection roller
gear)
I (White pressure
roller gear)
R (Sun gear
39/24) N (Sun gear
36/27)
Y (Planet gear 44 of
Arm C ASSY)
O (Gear 39)
A (Motor gear)
L (Planet gear 20Aof Arm AASSY)
Clutch lever (Gears 14/20)
(Gears 18/41)
Right side
Left side
Main frame
Platen frame
e (Gear 46 of Friction torque
transmission ASSY)
d (Gear 18)
c (Gear 20/40)
b (Gear 33RB)
e (Ribbon drive gear, Gear 24)
a (Platen gear, Gear 23)
X (Paper ejection roller gear, Gear 40)
W (Clutch gear ASSY)
S (Planet gear
34 of Arm P
ASSY)

III – 6
2.3.2 Description of planetary gear system
The equipment uses the following three planetary gear systems:
- Sun gear 20/90 ("B" in the figure given on the previous page) and its planet gears
- Sun gear 36/27 ("N") and its planet gear
- Sun gear 39/24 ("R") and its planet gear
This section describes the planetary gear system of the sun gear 20/90 ("B"). It consists of
the sun gear 20/90, two planet gears 20, arm A, and arm B, as shown below.
Planetary Gear System
If the motor rotates, the sun gear 20/90 rotates so that the rotational torque 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 20/90.
If the planet gear(s) becomes engaged with any other gear so that the arm cannot turn fur-
thermore, the rotational torque of the sun gear 20/90 is transmitted to that planet gear. Ac-
cordingly, the planet gear starts rotation in the opposite direction of the sun gear 20/90.
Arm A
Motor gear
Arm B
Planet gear 20B
Sun gear 20/90
Planet gear 20A

III – 7
2.3.3 Power transmission for four operation modes
Depending upon the solenoid ON/OFF state and the motor rotation direction, the planetary
gear train switches the power transmission route for the four operation modes.
Solenoid ON/OFF state Motor rotation direction
Solenoid: OFF
Arm A
Forward
Reverse
Planet gear 20B
Planet gear
20A
Sun gear
20/90
Arm B
Solenoid
Clutch lever
Spring
Cutout x(engaged
with the stopper of
arm A)
Solenoid: ON
Clutch lever
Spring
Cutout x(engaged
with the stopper of
arm A)
Solenoid
Section y(to block the
stoppper of arm B)
Section y(to block the
stoppper of arm B)
Motor
gear
Stopper
of arm A
Stopper of
arm B

III – 8
[ 1 ] Scanning mode (Solenoid: OFF, Motor rotation: Reverse)
In the scanning mode, the control electronics deactivates the solenoid. When the motor ro-
tates in the reverse direction, the clutch lever turns counterclockwise with the spring so that
its cutout xbecomes engaged with the stopper of arm A. Once arm A is locked, the planet
gear 20A ("L") will not be engaged with any other gear but simply idle.
The motor's rotational torque turns the sun gear 20/90 ("B") clockwise so that the planet gear
20B ("C") transmits the torque to the separation roller gear ("F"), white pressure roller gear
("I") and document ejection roller gear ("K") via the several gears.
Arm A Locked by Cutout xx
xx
xof Clutch Lever
E
GHJ
D
L
I (White pressure
roller gear)
F (Separation
roller gear)
B (Sun gear 20/90)
C (Planet gear 20B)
(Front)
Solenoid A (Motor gear)
Clutch lever K (Document
ejection roller
gear)
Active Gears
L (Planet gear 20A)
Solenoid
Clutch lever
Stopper of arm A
Cutout xof clutch lever
C (Planet gear 20B)
B (Sun gear 20/90)