Brother CB200 User manual

COPYBOARD
SERVICE MANUAL
MODEL: CP1800/CP2000/CB200

© Copyright Brother 2000
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.
All products and company names mentioned in this manual are trademarks or registered trademarks of their
respective holders.

PREFACE
This publication is a Service Manual covering the specifications, construction, theory of operation,
and maintenance of the Brother copyboard. It includes information required for field
troubleshooting and repair--disassembly, reassembly, and lubrication--so that service personnel
will be able to understand machine function, to rapidly repair the machine and order any necessary
spare parts.
To perform appropriate maintenance so that the machine 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 appendix.
CHAPTER I.GENERAL DESCRIPTION
CHAPTER II.THEORY OF OPERATION
CHAPTER III.DISASSEMBLY/REASSEMBLY AND LUBRICATION
CHAPTER IV. MAINTENANCE MODE
CHAPTER V. ERROR INDICATION AND TROUBLESHOOTING
Appendix. Circuit Diagrams
This manual describes the models and their 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
1.1 MACHINE OUTLINE............................................................................................. I-1
1.1.1 External Appearance and Weight.............................................................. I-1
1.1.2 Components ............................................................................................. I-1
1.2 SPECIFICATIONS................................................................................................ I-2

I- 1
1.1 MACHINE OUTLINE
1.1.1 External Appearance and Weight
The figure below shows the machine appearance and approximate dimensions.
CP2000/CB200 CP1800
Weight: Machine proper 14.5 kg (32.0 lbs.) 11.8 kg (26.0 lbs.)
In package 23.0 kg (50.7 lbs.) 19.5 kg (43.0 lbs.)
1.1.2 Components
The machine consists of the following major components:

I- 2
1.2 SPECIFICATIONS
Model CP2000 CB200 CP1800
MACHINE SPECIFICATIONS
INPUT Screen Size (H) x (W) 35.43 x 23.62 inches
900 x 600 mm
Effective Scanning Area (H) x (W) 34.57 x 23.39 inches
878 x 594 mm
Ratio of Scanning Area 96.60%
Scanning Method CIS Same as left. Same as left.
Number of Screens 2 (Endless)
Number of Screens for Copy 2
Writing Dry-erase markers
OUTPU
TPrinting Method Thermal
Copy Size Letter Letter/A4 Letter
Copy Speed Monochrome: 18 sec
R&B: N/A
Continuous Copy 1 sheet
Paper Therma PLUS, 30 m
Anti-Curl System (ACS) Yes
Print Density 8 dots/mm
USE Easel Stand Portrait Same as left. Same as left.
Wall Mount Portrait/landscape
Partition Hanger Portrait/landscape
POWER Power Source AC adapter supplied,
100 to 240 VAC,
50/60 Hz
Power Consumption Standby 5W
Operating 30W
SIZE Size (H x W x D) In package inch 54.5 x 33.6 x 11.0 49.9 x 38.3 x 10.0
mm 1383 x 852 x 280 1267 x 973 x 255
Use with easel stand inch 75.9 x 28.5 x 27.0 N/A
mm 1929 x 725 x 687
Use without easel stand inch 49.9 x 28.5 x 5.8 N/A
(Portrait) mm 1268 x 725 x 147 Same as left.
Use without easel stand inch 33.3 x 45.2 x 5.8 Same as left.
(Landscape) mm 846 x 1147 x 147
Weight Net 14.5 kg (32.0 lbs) 11.8 kg (26.0 lbs)
Gross 23 kg (50.7 lbs) 19.5 kg (43.0 lbs)
PC I/F Yes Yes for Canada Option

CHAPTER II.
THEORY OF OPERATION

CHAPTER II. THEORY OF OPERATION
CONTENTS
2.1 OVERVIEW........................................................................................................... II-1
2.2 MECHANISMS...................................................................................................... II-2
2.2.1 Scanner mechanism.................................................................................... II-2
2.2.2 Thermal printing mechanism....................................................................... II-4
2.2.3 Sensors....................................................................................................... II-5
2.3 CONTROL ELECTRONICS.................................................................................. II-6

II - 1
2.1 OVERVIEW

II - 2
2.2 MECHANISMS
The machine consists of the following three mechanisms and sensors:
nScanner Mechanism (Copyboard) -Scrolling the copyboard screen
-Scanning the copyboard screen
nThermal Printing Mechanism (Printer) -Printing image drawn on the copyboard screen and
feeding recording paper
nEasel Stand*
nSensors -PE/cover sensor
- Thermistor in the thermal recording head
-CIS unit which acts as a home position detector of the
copyboard screen
*Not provided for the CP1800.
2.2.1 Scanner mechanism
The scanner mechanism in the copyboard consists of a scanner, copyboard screen, WB motor,
and relay PCB, as illustrated on the next page.
The relay PCB, which is connected to the printer via the interface cable, relays power and control
signals sent from the main PCB of the printer to the WB motor and relays the scanned image with
control signals from the CIS units to the main PCB. If you press the FEED key, the WB motor
rotates to drive the screen feed pipe, scrolling up the copyboard screen.
The scanner uses three CIS units, each of which consists of an LED array illuminating the
copyboard screen via a glass prism bar, six lenses collecting the reflected light, and a CIS PCB
carrying out photoelectric conversion to output picture element data.
When pressing any copy-related key scrolls the copyboard screen, the CIS units scan the screen.
After a sequence of the scanning operation, the controller scrolls the screen further until the left-
hand CIS unit detects either one of the two black home position (HP) marks pasted on the screen.
Home positioning of the copyboard screen is automatically performed also when you power on the
machine.

II - 3

II - 4
2.2.2 Thermal printing mechanism
The thermal printing mechanism in the printer consists of the thermal recording head, platen, anti-
curl system (ACS) plate, and paper compartment cover.
The heat-sensitive recording paper is routed between the paper guide bar and ACS plate to the
recording head which prints onto the paper pressed by the platen according to image signals
issued from the main PCB.
The ACS eliminates curl peculiar to rolled paper by curving the paper towards the opposite side of
the curl with the ACS plate.
If the printer motor (stepping motor) is driven, its rotational force is transmitted via the gear train in
the drive unit to the platen gear. The platen rotates to feed paper.

II - 5
2.2.3 Sensors
This machine has three sensors--PE/cover sensor (photosensor), thermistor in the thermal
recording head, and left-hand CIS unit acting as a home position detector of the copyboard screen.
The PE/cover sensor is located on the PE/cover sensor PCB secured to the recorder frame. It
detects whether the recording paper is present or the paper compartment cover is closed.
The thermistor in the recording head allows the controller to monitor the temperature of the head.
According to the change of the thermistor's internal resistance monitored, the controller manages
the duty cycle of the head drive current.
The left-hand CIS works as a home position detector of the copyboard screen also. If it detects
either of the two black HP marks pasted on the copyboard screen, it recognizes that the screen is
in the home position.

II - 6
2.3 CONTROL ELECTRONICS

CHAPTER III.
DISASSEMBLY/REASSEMBLY AND
LUBRICATION

i
CHAPTER III. DISASSEMBLY/REASSEMBLY AND LUBRICATION
CONTENTS
3.1 DISASSEMBLY/REASSEMBLY........................................................................... III-1
nSafety Precautions.............................................................................................. III-1
nTightening Torque List........................................................................................ III-2
nPreparation......................................................................................................... III-3
nHow to Access the Object Component................................................................ III-3
nDisassembly Order Flow..................................................................................... III-4
3.1.1 Disassembly of Printer................................................................................. III-5
[ 1 ] Separating the paper compartment cover from the printer base unit...... III-5
[ 2 ] Removing the components from the paper compartment cover............. III-8
Removing the paper guide bar and platen ............................................. III-8
Removing the lock shaft and paper compartment latch.......................... III-9
Removing the paper stoppers and platen frames................................... III-10
[ 3 ] Removing the components from the printer base unit............................ III-12
Removing the printer support ................................................................ III-12
Removing the sub cover and control panel PCB.................................... III-13
Removing the main PCB and its bracket ............................................... III-14
Removing the drive unit and hinge plate L............................................. III-17
Removing the head protector, recording head ASSY, recorder frame,
and PE/cover sensor PCB..................................................................... III-19
Removing the films ............................................................................... III-21
3.1.2 Disassembly of Copyboard ......................................................................... III-22
[ 1 ] Removing the CIS units......................................................................... III-22
Removing the upper cover, corner covers, CIS protector, and
upper support frame.............................................................................. III-22
Removing the CIS frame and CIS units................................................. III-23
[ 2 ] Removing the relay PCB and printer-copyboard interface cable ............ III-26
Removing the lower cover, corner covers, CIS protector, and
lower support frame............................................................................... III-26
Removing the WB motor harness, relay PCB, and
printer-copyboard interface cable........................................................... III-27

ii
[ 3 ] Removing the lower pipe and WB motor ............................................... III-29
Removing the lower corner plates and lower frame ............................... III-29
Removing the pipe holder stoppers, pipe spacer L, lower pipe and
its holders.............................................................................................. III-30
Removing the WB motor....................................................................... III-33
[ 4 ] Replacing the white sheet (copyboard screen) and the sheet
backup board......................................................................................... III-35
3.2 LUBRICATION ..................................................................................................... III-40
[ 1 ] Joints between the platen shaft and its bushings.................................... III-40
[ 2 ] WB motor related gears on the lower pipe holder L ............................... III-40
[ 3 ] Lower pipe holder L............................................................................... III-41
[ 4 ] Lower pipe holder R............................................................................... III-41
[ 5 ] Upper pipe shaft.................................................................................... III-42

III - 1
3.1 DISASSEMBLY/REASSEMBLY
nn Safety Precautions
To prevent the creation of secondary problems by mishandling, observe the following precautions
during maintenance work.
(1) Turn the power off and unplug the AC cord from the power outlet before accessing parts or
units inside the machine. When disassembling the printer, unplug the AC adapter from the
left side of the printer.
(2) Be careful not to lose screws, washers, or other parts removed for parts replacement.
(3) When using soldering irons and other heat-generating tools, take care not to damage the resin
parts such as wires, PCBs, and covers.
(4) Before handling the PCBs, touch a metal portion of the machine to discharge static electricity;
otherwise, the electronic parts may be damaged due to the electricity charged in your body.
(5) When transporting PCBs, be sure to wrap them in conductive sheets such as aluminum foil.
(6) Be sure to reinsert self-tapping screws correctly, if removed.
When removing self-tapping screws from aluminum frames, aluminum material may stick to
the threads of those screws, requiring higher torque for retightening. If it happens, do not
tighten them forcedly, but use new screws and observe the specified torque values.
(7) Tighten screws to the torque values listed on the next page.
(8) When connecting or disconnecting cable connectors, hold the connector bodies not the
cables. If the connector has a lock, always slide the connector lock to unlock it.
(9) Before reassembly, apply the specified lubricant to the specified points. (Refer to Section
3.2.)
(10) After repairs, check not only the repaired portion but also that the connectors and other
related portions function properly before operation checks.
(11) After completion of repairs, always press the FEED key to scroll the copyboard screen (white
sheet) to the home position. This prevents the screen from leaving traces of being curled
along the upper and lower pipes within the scanning area.
Make sure that the copyboard screen is in the home position before storing or packing it.

III - 2
nn Tightening Torque List
Location Screw type Q'ty Tightening torque (N•m)
PRINTER
Platen stopper Taptite, pan B M4x20 10.69 ±0.1
Platen frames R and L Taptite, bind B M4x12 40.98 ±0.2
Printer support Taptite, cup S M3x6 20.69 ±0.1
Taptite, bind B M4x12 20.98 ±0.2
Sub cover Taptite, bind B M4x12 10.98 ±0.2
Panel cover Taptite, bind B M4x12 20.98 ±0.2
Control panel PCB Taptite, cup B M3x8 20.69 ±0.1
Main PCB Taptite, cup S M3x6 20.69 ±0.1
Drive unit Taptite, bind B M4x12 20.98 ±0.2
Printer motor cover Taptite, cup S M3x6 10.69 ±0.1
Printer motor Screw, pan (s/p washer) M3x6DB 10.69 ±0.1
Hinge plate L Taptite, bind B M4x12 20.98 ±0.2
Recorder frame Taptite, bind B M4x12 20.98 ±0.2
PE/cover sensor PCB Taptite, cup S M3x6 10.69 ±0.1
COPYBOARD
Upper cover Shoulder screw 30.78 ±0.1
Corner covers (upper) Screw, flat S M3x10 40.78 ±0.1
CIS protector (upper) Taptite, cup S M3x10 20.78 ±0.1
Upper support frame Taptite, cup S M3x10 20.78 ±0.1
CIS frame Taptite, cup S M3x10 40.78 ±0.1
CIS units Taptite, bind B M3x8 60.39 ±0.1
Lower cover Shoulder screw 30.78 ±0.1
Corner covers (lower) Screw, flat S M3x10 40.78 ±0.1
CIS protector (lower) Taptite, cup S M3x10 20.78 ±0.1
Lower support frame Taptite, cup S M3x10 20.78 ±0.1
PCB support Taptite, cup S M3x10 20.78 ±0.1
Relay PCB Taptite, cup S M3x6 20.78 ±0.1
Printer-copyboard interface cable Taptite, cup S M3x10 20.78 ±0.1
Lower corner plates R and L Taptite, cup S M3x10 40.78 ±0.1
Lower frame Taptite, washer S M3x10 10.78 ±0.1
Taptite, bind B 3x8 20.69 ±0.1
Pipe holder stoppers Taptite, cup S M3x8 20.78 ±0.1
WB motor Screw, pan (s/p washer) M3x6DB 20.78 ±0.1
Side covers R and L Taptite, cup S M3x10 60.78 ±0.1