GT-1200
EPSON
PRODUIT
EPSON France S.A.
SERVICE MANUAL
SERVICE MANUAL
Color Image Scanner
EPSON GT-12000
®
4008511
NOTICE
n All rights reserved. No part of this manual may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic,
mechanical, photocopying, recording, or otherwise, without the prior written permission of SEIKO EPSON CORPORATION.
n The contents of this manual are subject to change without notice.
n All effort have been made to ensure the accuracy of the contents of this manual. However, should any errors be detected, SEIKO EPSON would greatly
appreciate being informed of them.
n The above not withstanding SEIKO EPSON CORPORATION can assume no responsibility for any errors in this manual or the consequences thereof.
EPSON is a registered trademark of SEIKO EPSON CORPORATION.
General Notice:
Other product names used herein are for identification purpose only and may be trademarks or registered trademarks of their respective
owners. EPSON disclaims any and all rights in those marks.
Copyright © 1996 SEIKO EPSON CORPORATION. Printed in Japan.
PRECAUTIONS
Precautionary notations throughout the text are categorized relative to 1)Personal injury and 2) damage to equipment.
DANGER
Signals a precaution which, if ignored, could result in serious or fatal personal injury. Great caution should be exercised in performing
procedures preceded by DANGER Headings.
WARNING
Signals a precaution which, if ignored, could result in damage to equipment.
The precautionary measures itemized below should always be observed when performing repair/maintenance procedures.
DANGER
1. ALWAYS DISCONNECT THE PRODUCT FROM THE POWER SOURCE AND PERIPHERAL DEVICES PERFORMING ANY MAINTENANCE OR
REPAIR PROCEDURES.
2. NOWORK SHOULD BE PERFORMED ON THE UNIT BY PERSONS UNFAMILIER WITH BASIC SAFETY MEASURES AS DICTATED FOR ALL
ELECTRONICS TECHNICIANS IN THEIR LINE OF WORK.
3. WHEN PERFORMING TESTING AS DICTATED WITHIN THIS MANUAL, DO NOT CONNECT THE UNIT TO A POWER SOURCE UNTIL
INSTRUCTED TO DO SO. WHEN THE POWER SUPPLY CABLE MUST BE CONNECTED, USE EXTREME CAUTION IN WORKING ON POWER
SUPPLY AND OTHER ELECTRONIC COMPONENTS.
WARNING
1. REPAIRS ON EPSON PRODUCT SHOULD BE PERFORMED ONLY BY AN EPSON CERTIFIED REPAIR TECHNICIAN.
2. MAKE CERTAIN THAT THE SOURCE VOLTAGES IS THE SAME AS THE RATED VOLTAGE, LISTED ON THE SERIAL NUMBER/RATING PLATE. IF
THE EPSON PRODUCT HAS A PRIMARY AC RATING DIFFERENT FROM AVAILABLE POWER SOURCE, DO NOT CONNECT IT TO THE POWER
SOURCE.
3. ALWAYS VERIFY THAT THE EPSON PRODUCT HAS BEEN DISCONNECTED FROM THE POWER SOURCE BEFORE REMOVING OR REPLACING
PRINTED CIRCUIT BOARDS AND/OR INDIVIDUAL CHIPS.
4. IN ORDER TO PROTECT SENSITIVE MICROPROCESSORS AND CIRCUITRY, USE STATIC DISCHARGE EQUIPMENT, SUCH AS ANTI-STATIC
WRIST STRAPS, WHEN ACCESSING INTERNAL COMPONENTS.
5. REPLACE MALFUNCTIONING COMPONENTS ONLY WITH THOSE COMPONENTS BY THE MANUFACTURE; INTRODUCTION OF SECONDSOURCE ICs OR OTHER NONAPPROVED COMPONENTS MAY DAMAGE THE PRODUCT AND VOID ANY APPLICABLE EPSON WARRANTY.
PREFACE
This manual describes basic functions, theory of electrical and mechanical operations, maintenance and repair procedures of GT-12000. The instructions and
procedures included herein are intended for the experienced repair technicians, and attention should be given to the precautions on the preceding page. The
chapters are organized as follows:
CHAPTER 1.
PRODUCT DESCRIPTIONS
Provides a general overview and specifications of the product.
CHAPTER 2.
OPERATING PRINCIPLES
Describes the theory of electrical and mechanical operations of the product.
CHAPTER 3.
TROUBLESHOOTING
Provides the step-by-step procedures for troubleshooting.
CHAPTER 4.
DISASSEMBLY AND ASSEMBLY
Describes the step-by-step procedures for disassembling and assembling the
product.
CHAPTER 5.
ADJUSTMENTS
Provides Epson-approved methods for adjustment.
CHAPTER 6.
MAINTENANCE
Provides preventive maintenance procedures and the lists of Epson-approved
lubricants and adhesives required for servicing the product.
APPENDIX
Provides the following additional information for reference:
• Connector pin assignments
• Electric circuit boards components layout
• Exploded diagram
• Electrical circuit boards schematics
REVISION STATUS
Rev.
A
Date
1997/10/20
Page(s)
All
Contents
First release
TABLE OF CONTENTS
PRODUCT DESCRIPTIONS
1.1 OVERVIEW....................................................................................................................................................................1-1
1.2 SPECIFICATION ...........................................................................................................................................................1-1
1.3........................................................................................................................................................................................1-4
1.3 INTERFACE SPECIFICATION ......................................................................................................................................1-4
1.4 CONTROL CODE ..........................................................................................................................................................1-5
1.5 OPERATION SPECIFICATIONS ...................................................................................................................................1-6
1.5.1 Switch Specification...........................................................................................................................................................................1-6
1.5.2 LED Specification ...............................................................................................................................................................................1-6
1.5.3 Switch Setting .....................................................................................................................................................................................1-7
1.5.4 Error Indication ...................................................................................................................................................................................1-7
1.5.5 Readable Area.....................................................................................................................................................................................1-8
1.5.6 Transportation Screw.........................................................................................................................................................................1-8
OPERATING PRINCIPLES
2.1 GENERAL DESCRIPTION ............................................................................................................................................2-1
2.2 MECHANISM OPERATING PRINCIPLES.....................................................................................................................2-2
2.3 ELECTRICAL CIRCUIT OPERATIONS.........................................................................................................................2-3
2.3.1 Control Circuit Operation...................................................................................................................................................................2-3
2.3.2 Power Supply Circuit Operation........................................................................................................................................................2-5
TROUBLESHOOTING
3.1 OVERVIEW....................................................................................................................................................................3-1
3.1.1 Error Detection by the Self-Diagnostic Function .............................................................................................................................3-1
3.1.2 Troubleshooting .................................................................................................................................................................................3-2
3.1.2.1 Test Points ................................................................................................................................................................................3-2
3.1.2.2 Check Points for Abnormal Phenomenon .................................................................................................................................3-2
3.1.3 Troubleshooting for Electrical Circuit ..............................................................................................................................................3-8
3.1.3.1 Power Supply Board (B054PSH Board) ....................................................................................................................................3-8
3.1.3.2 Control Circuit Board (B054MAIN Board)..................................................................................................................................3-9
DISASSEMBLY AND ASSEMBLY
4.1 OVERVIEW....................................................................................................................................................................4-1
4.1.1 Tools ....................................................................................................................................................................................................4-1
4.1.2 Screws .................................................................................................................................................................................................4-1
4.2 DISASSEMBLY PROCEDURES ..................................................................................................... ..............................4-2
4.2.1 Electrical Circuit Removal..................................................................................................................................................................4-3
4.2.1.1 EPROM Replacement ...............................................................................................................................................................4-3
4.2.1.2 MAIN/B054PSH Board Removal...............................................................................................................................................4-4
4.2.2 Scanner Body Disassembly...............................................................................................................................................................4-5
4.2.2.1 Upper Housing Removal ...........................................................................................................................................................4-5
4.2.2.2 Scanner Mechanism Removal ..................................................................................................................................................4-6
4.2.3 Scanner Mechanism Disassembly ....................................................................................................................................................4-7
4.2.3.1 Panel Board Assembly Removal...............................................................................................................................................4-7
4.2.3.2 Sub Board Assembly Removal..................................................................................................................................................4-8
4.2.3.3 HP Sensor (CR) Removal .........................................................................................................................................................4-9
4.2.3.4 CR Motor Assembly Removal .................................................................................................................................................4-10
4.2.3.5 Glass Frame Assembly Removal and Pre-operation ..............................................................................................................4-11
4.2.3.6 Lamp Assembly and Inverter Board Assembly Removal ........................................................................................................4-14
4.2.3.7 HP (AF) Sensor Removal........................................................................................................................................................4-16
4.2.3.8 AF Motor Assembly Removal.................................................................................................................................................4-17
4.2.3.9 AF Motor Assembly Installation...............................................................................................................................................4-18
4.2.3.10 Option Frame Assembly Removal.........................................................................................................................................4-19
ADJUSTMENT
5.1 OVERVIEW....................................................................................................................................................................5-1
MAINTENANCE
6.1 OVERVIEW....................................................................................................................................................................6-1
6.1.1 Cleaning...............................................................................................................................................................................................6-1
6.1.2 Lubrication ..........................................................................................................................................................................................6-1
APPENDIX
7.1 OVERVIEW....................................................................................................................................................................7-1
7.1.1 Connector Pin Assignment................................................................................................................................................................7-1
7.1.2 Connector Summary...........................................................................................................................................................................7-1
7.2 COMPONENT LAYOUT ........................................................................................................... .....................................7-6
7.3 CIRCUIT DIAGRAMS ....................................................................................................................................................7-8
7.4 EXPLODED DIAGRAMS .............................................................................................................................................7-10
CHAPTER
1
PRODUCT DESCRIPTIONS
GT-12000
Product Descriptions
1.1 OVERVIEW
1.2 SPECIFICATION
The GT-12000 is an A3 size flat-bed type color image scanner. The main
features of the scanner are:
GENERAL
Type:
Scanning Method:
Photoelectric Device:
Color Separation:
Light Source:
Scanning Resolution:
Output Resolution:
Effective Picture Element:
Maximum Readable Area:
Scanning Speed:
q High resolution
Optical resolution is 800 dpi.
q Wide readable area
Accommodates up to A3 size.
q High-quality image
12bit A/D input/output (optical density is 3.0.)
q High-speed scanning
Scanning A3/Portrate At 800dpi / Draft-mode;
Full-color =
Approx. 15mS/line
256 Gray =
Approx. 10.8mS/line
Line art =
Approx. 10.8mS/line
q Adjustable Focusing function
Adjustable up to 5mm above the surface of document table.
Flat-bed color image scanner
Sub-Scanning mirror movement system
Color CCD Line sensor
Color filter separation
Xe-Gas Cold Cathode Fluorescent Lamp
800 (Main) by 800 (Sub) dpi
50 to 3200dpi (1dpi increment)
9760 by 13760 pixel (Max.)
12.2 by 17.2 inch (310 by 437mm)
At 800 dpi / Draft mode;
Table 1-1. Scanning Speed
Original
Reading Area
Line Art
256 Gray-scale
Full Color
A4/Portrait
Less than 210mm
Approx. 7.5mS/line
Approx. 7.5mS/line
Approx. 10.0mS/line
A4/Portrait - A3/Portrait
210 to 310mm
Approx. 10.8mS/line
Approx. 10.8mS/line
Approx. 15.0mS/line
q Quick operation
Xe-Gas Cold Cathode Fluorescent Lamp allows no initial light-up for
immediate scanning.
q New command level:
ESC/I-B8 (B6 level with Focus control)
q Optional unit enhancing the function of the unit
n Transparency Unit
n Duplex scanning ADF (Automatic Document Feeder)
Rev. A
1-1
GT-12000
IMAGING FUNCTIONS
Gradation:
Product Descriptions
Brightness Control:
Input/internal process =
Output =
50 to 200% (1% increment)
CRT (A/B)
PRINTER (A/B/C)
User definable (1 level)
Impact-Dot Printer
Thermal Printer
Ink jet Printer
CRT Display
User definable (1 level)
7 levels
Image Processing:
Bi-level=
Zoom:
Gamma Correction:
Color Correction:
Focusing:
INTERFACE
Standard Interface:
SOFTWARE
Commend Level:
Rev. A
12bit/pixel
8 or 12bit/pixel
Fixed threshold
TET
Half-toning= Error diffusion (A/B/C)
Dither (Resident) (A/B/C/D)
Dither (user definable) (A/B)
One-piece CCD/Lens movement system
Bi-Directional Parallel
SCSI (50/50 pin connectors)
ESC/I-B8 (B6 level with Focus control)
ELECTRICAL SPECIFICATION
Power supply voltage:
[120 V version]
Rated voltage = AC100 - 120 V (± 10%)
[220-240 V version]
Rated voltage = AC220 - 240 V (± 10%)
Rated frequency range:
50 / 60 Hz (49.5 - 60.5 Hz)
Power consumption:
Approximately 60 W (without an optional unit)
Maximum 75 W (with an optional unit)
Insulation resistance:
10 M W at 500 VDC
(between AC line and chassis)
Dielectric strength:
AC 1.5 KV / minute
(between AC line and chassis)
Static electricity:
Panel = 10 KV
Metal = 7 KV / 150 pF, 150 W
SAFETY, EMC
Safety regulation:
UL1950 with D3
CSA C22.2 NO. 950 with D3
Low voltage directive
73/23/EEC: EN60950 (TUV)
EN60950 Nordic Deviation (NEMKO)
EMC:
FCC Part15 Subpart B Class B (USA)
CSA C108.8 Class B (Canada)
AS/NZS3548 Class B
Directive 89/336/EEC:
EN55022 Class B
EN61000-3-2
EN61000-3-3
EN50082-1
IEC 801-2
IEC 801-3
IEC 801-4
1-2
GT-12000
Product Descriptions
ENVIRONMENTAL CONDITIONS
Temperature:
Operating =
Storage =
Humidity:
Operating =
Storage =
RELIABILITY
Main unit:
5 to 35°C
-25 to 60°C
10 to 80% (no condensation)
10 to 85% (no condensation)
PHYSICAL DIMENSIONS AND WEIGHT
Dimensions:
656 (W) x 458 (D) x 170 mm (H)
(See Figure 1-1.)
Weight:
Approximately 20 Kg
MCBF 100,000 cycle
OPERATING CONDITIONS
Dust:
Ordinary office or home conditions.
(Should be kept away from extreme dust.)
Illumination:
Operation under direct sunlight or near
strong light source should be avoided.
170mm
(6.7")
458mm
(18")
DOCUMENT
Reflective type:
Transparency type:
Rev. A
656mm (25.8")
Smooth surface such as a printing and
photograph.
Reversal film, Negative film
Note: The optional transparency unit must be
used.
Figure 1-1. External Dimension of the GT-12000
1-3
GT-12000
Product Descriptions
1.3 INTERFACE SPECIFICATION
This scanner is equipped with the following interfaces:
q Bi-directional Parallel Interface
n Data:
8 bit parallel
n Handshake:
BUSY, /ACK handshaking
n Signal:
TTL level
n Connector:
36 pins (Amphenol)
q SCSI interface
n Function:
Conforms to ANSI Standard X3.131-1986.
n Electrical specification: Conforms to ANSI Standard X3.131-1986.
(TTL compatible level)
n Connector:
50 / 50 pin (Amphenol)
n Terminator:
Internal terminator
Switches between “active” and “ inactive”
n SCSI ID
Set with an internal rotary switch
(Range: 0 - 7)
Rev. A
1-4
GT-12000
Product Descriptions
1.4 CONTROL CODE
Table 1-3. Control Code Summary (continued)
The command level for this scanner is ESC/I-B8. The commands
supported are shown in the table below.
Category
Auxiliary
Table 1-2. Control Code Summary
Category
Execute Command
Data Format Setting
Image Setting
Image Processing
Rev. A
Command Name
Identity Request
Status Flag Request
Extended Status Flag
Request
Parameter Request
Scanning Start
Set Data Format
Set Resolution
Set Zooming
Set Read Area
Set Color
Mirroring
Set Brightness
Set Gamma Correction
Download Gamma Table
Set Sharpness
Set Digital Halftoning
Set Auto Area
Segmentation
Download Dither Pattern
Set Color Correction
Download Color Correction
Set Threshold
Code
ESC I
ESC F
ESC f
ESC S
ESC G
ESC Di
ESC R n1 n2
ESC H i1 i2
ESC A n1 n2 n3 n4
ESC Ci
ESC Ki
ESC Li
ESC Zi
ESC zi d0 d1 - d255
ESC Qi
ESC Bi
ESC si
Control
Command Name
Set Scanning Mode
Initnialize
Set Line Counter
Control Option
Set Focus
Focus Position Request
Set Ratio Correction for
Main and Sub Scan
Set the Film type
Eject Paper
Feed Paper
Normal Response
Abnormal Response
Abort Scanning
Header
Code
ESC gi
ESC @
ESC di
ESC ei
ESC pi
ESC q
ESC Wi
ESC Ni
ESC FF
ESC PF
ACK
NACK
CAN
STX
ESC b I I j d (j2)
ESC Mi
ESC m d1 d2 - d9
ESC t
1-5
GT-12000
Product Descriptions
1.5 OPERATION SPECIFICATIONS
1.5.1 Switch Specification
This scanner is equipped with 4 switches. Their functions are described
below:
q “OPERATE “
n Turns on and off the scanner.
n Pressing this switch for power-on initializes the scanner.
q “RESET”
Initializes the scanner.
q SCSI ID rotary switch (located at the back of the scanner)
Sets the SCSI device ID for this scanner when the SCSI interface is
used to connect the scanner with the host computer.
Note: The factory default value for this scanner is “2”.
q SCSI terminator setting switch (located at the back of the scanner)
Alternates the internal terminator setting between “Connected” and
“Disconnected” when the SCSI interface is in use.
Note: The factory default setting for this switch is “On” (Connected).
ERROR
READY OPERATE
q OPERATE n
Indicates the scanner’s power On/Off status. It is on when the scanner
power is on.
OPERATE
0
ON
1
2
1.5.2 LED Specification
This scanner has the following 3 LED indicators:
RESET
3
7
OFF
SW
6
5
4
q READY n
n Comes on when the scanner is ready to receive commands. It
flickers during scanning due to data transmission between the host
computer and the scanner.
n Indicates an error type in combination with the ERROR LED
indicator when an error has occurred.
q ERROR n
Comes On when an error has occurred.
Rev. A
Figure 1-2. Buttons, Switches and LED Indicators
1-6
GT-12000
Product Descriptions
1.5.3 Switch Setting
1.5.4 Error Indication
Among the switches equipped with this scanner, SCSI switch and the
terminator switch, which are used for SCSI interface, have the following
settings:
q SCSI-ID setting switch
ID No.
Availability
Note
0
Available
Normally assigned to other SCSI device such
as a hard disc.
1
Available
Normally assigned to other SCSI device such
as a hard disc.
2
Available
Set at the factory to the scanner.
3
Available
4
Available
5
Available
6
Available
7
Available
Normally assigned to the SCSI host adopter.
(Blank) Not Available Not effective / Not used
Not Available Not effective / Not used
*
When an error has occurred, the error type is indicated by the
corresponding combination of the “READY” and “ERROR” LED indicators.
üCHECK POINT
Table 1-4. Error Types and Corresponding Indications
READY n
ERROR n
Error Type
ON
ON
Command error
OFF
Blinks
Communication error
Blinks
Blinks
Fatal error
OFF
OFF
Option error
Note: The remedies for these errors are provided in Chapter 3
“Troubleshooting”.
Do not set the ID number that is already assigned
to other SCSI device.
q Terminator switch
Setting
Note
ON
Connects to the terminal resistor. /Factory default
setting
OFF
Disconnects from the terminal resistor.
üCHECK POINT
Rev. A
Be aware that the terminator switch must be set
according to the scanner location on the “daisychain”.
1-7
GT-12000
Product Descriptions
1.5.5 Readable Area
1.5.6 Transportation Screw
The origin point for this scanner is marked at the rear left corner of the
document table viewed from the front. See Figure 1-3 for the maximum
readable area of the scanner.
A transportation screw is attached to the left side of the scanner viewed
from the front. Fastening the screw fixes the CR to protect the scanner
from the shock while the scanner is transported or moved. Be sure to turn
the screw to the unlocking position (Described in the figure below.) before
turning the scanner power on.
Main Scan Direction
2 ±1.5mm
Sub Scan Direction
Origin Point
Maximum Readable Area
437mm
(17.2")
L o c k in g p o s itio n s e t w h ile
tr a n s p o r tin g /m o v in g th e s c a n n e r .
U n lo c k in g p o s itio n s e t w h ile
th e s c a n n e r is u s e d .
Front
2 ±1.5mm
2 ±1.5mm
310mm (12.2")
2 ±1.5mm
Figure 1-4. Transportation Screw
Figure 1-3. Maximum Readable Area
Rev. A
1-8
CHAPTER
2
OPERATING PRINCIPLES
GT-12000
Operating Principles
2.1 GENERAL DESCRIPTION
The EPSON GT-12000 is mainly composed of the following units:
q Scanner mechanism
(Lamp/Mirror units, CR drive mechanism, integral lens/CCD sensor
unit drive mechanism)
q Control Circuit
q Power supply circuit
The EPSON flat-bed type scanners usually read images by moving the
integral CR unit which consists of the lamp, mirror, lens/CCD sensor. This
scanner, however, characteristically has the CCD sensor and the lens in
the whole unit attached onto the mechanism as an independent unit. This
scanner is also equipped with the newly designed focusing function which
enables the scanner to focus by adjusting the distance between the lens
and the CCD sensor. Therefore, the lens unit is set movable and driven by
the specified motor. Since the separate units in the mechanism such as
the lamp (light source) and the mirrors move at their own speed for
reading, the incident distance of the reflected light from the document to
the CCD sensor is kept constant.
The control circuit board and the power supply circuit board are stored in
the separate shield compartment. Since it is only connected to the
connector board in the scanner mechanism, it is removed and maintained
with ease.
B054PNL Board
Mirror Unit
Lamp/Mirror Unit
Motor
(for Lens Unit Drive)
HP Sensor
(for Mirror)
Motor
(for Lamp/Mirror Drive)
Lens Unit
Document
B054ISN Board
(CCD Sensor)
Drive Wires
HP Sensor (Lens)
CN3 CN2
CN1
CN4
CN7 B054SUB Board CN5
B054PSH Board
(Power Supply Circuit)
B054MAIN Board
(Control Circuit)
Bi-D
I/F
SCSI
I/F
I/F
(Optional)
CN6
AC Input
SCSI
ID Switch
Terminator Switch
Figure 2-1. Main mechanism Structure of the GT-12000
Rev. A
2-1
GT-12000
Operating Principles
2.2 MECHANISM OPERATING PRINCIPLES
Compared with other EPSON scanners, the main feature of this scanner
lies in its new optical mechanism used for reading images. Instead of the
united lamp & CCD movement system used for other scanners, this
scanner scans with the fixed CCD sensor and separate lamp and the
mirror units. Since the color CCD line sensor is used for the reading
device, only one light source is equipped and light is separated through
the RGB color filter.
As shown in Figure 2-2, the light source (high luminance cold cathode
xenon lamp), the first reflection mirror unit and the second reflection mirror
unit move independently at their own speed. Therefore the length of the
incident light reflected from the document to the CCD sensor is kept
constant. (Otherwise, excluding the fixed L1 and L2, LV1 and LV2 keep
changing to make the incident light length “L” constant.) Drive from the
stepping motor moves each mirror unit via the wires.
The CCD sensor and the lens are united into one unit, which is semi-fixed
on the base frame. For focusing function, it moves toward the optic with
the drive sent from the motor. (The focusing area with this function is from
0 to 5 mm (maximum) above from the glass surface.
Rev. A
LV1 (Variable)
Document
L1
(Fixed)
Document
Glass
x1
x2
CCD Sensor
Lens Unit
Lamp/Mirror unit
L2
(Fixed)
Mirror Unit
LV2 (Variable)
Figure 2-2. Optical Unit Structure
2-2
GT-12000
Operating Principles
2.3 ELECTRICAL CIRCUIT OPERATIONS
B 0 5 4 IS N B o a r d
This section describes the electrical circuit of the GT-12000.
D o c u m e n t
2.3.1 Control Circuit Operation
R
The control circuits of this scanner are:
B054MAIN board
B054SUB board
B054PNL board
B054ISN board
(Main control circuit board)
(Relay board)
(Control panel board)
(CCD sensor board located on the CR)
In v e rte r
After passed these processes, image data is finally output to the host.
1 2 b it
B 0 5 4 M A IN B o a r d
C P U
IC 1 3
(H D 6 4 1 3 0 0 3 T F )
Among various functions controlled by B054MAIN board, the core control
circuit of the scanner, and B054ISN, process from reading image with the
CCD sensor to processing image signals is described below:
q B054ISN Board (CCD image sensor)
n Photoelectric conversion:
Converts light reflected from the document (light energy) into
electrical energy (electrical charge).
n Amplification
n A/D conversion:
Converts the image data produced in the form of analog electrical
signal into 12-bit digital data.
q B054 MAIN Board (processing image data)
ASIC (IC24) on this board manages most of the following functions:
n Shading correction:
Performs image data correction on a black and white basis.
n Numbers of image correction such as gamma correction, color
correction, halftoning correction. (They are carried out according to
the settings on the host side.)
B
M P X A /D
IC 2
(A D 9 8 0 7 )
M o to
IC 3 /4
M ir r o
L e n s
r d r iv e r
/5 /6
r S h ift
S h ift
H P S e n s o r 1 /2
IC 1
E P R O M
( 1 M b it)
IC 1 7
P S R A M
( 1 M b it)
IC 2 4
(M E R C U R Y )
< Im
S
G
L
M
C
S
Z
B
T
A
L ig h t Q u a n tity
M o n ito r
q
q
q
q
G
C C D
a g in g P r o c e s s o r >
h a d in g
a m m a C o r r e c tio n
in e C o r r e c tio n
a in /S u b A v e r a g e
o lo r C o r r e c tio n
m o o th in g
o o m
i/Q u a d F o r m a ttin g
E T
A S
D R A M (1 M x 4 )
IC 7 /8 /9
< L in e C o r r e c tio n
M e m o ry >
P S R A M ( 1 M b it)
IC 1 8 - 2 3
< R G B Im a g e M e m o ry >
D R A M (1 M x 4 )
IC 1 0 /1 1 /1 2
< B u ffe r M e m o ry >
C N 6
O p tio n
IC 2 8
(G G IF )
< I/F C o n tro l P ro c e s s o r>
T P U
A D F
C N 2
B i- D I/F
C N 1 /3
S C S I I/F
Figure 2-3. Control Circuit Block Chart
Rev. A
2-3
GT-12000
Operating Principles
B054MAIN BOARD
Name
CPU
HD6413003TF
ASIC
MERCURY
Location
IC13
IC24
ASIC
CGIF
IC28
DRAM
(1MX4)
PSRAM (1M)
ROM (1M)
IC7-9
IC10-12
IC8-23
IC1
Description
The CPU, which operates at 16 MHz,
controls this board.
an image processor which controls the
followings:
· CCD
· Line correction memory
· Buffer memory
· Image processing
This I/F control processor controls the
followings:
· SCSI I/F
· Bi-D I/F
· Address decode
· PSRAM refresh
· Reset control
Line correction memory
Buffer memory
RGB image memory
Firmware memory
B054SUB BOARD
This is a relay board, a module is in the shield compound along with the
PSB/PSE board, which connects the B054ISN in the mechanism with the
B054PNL board.
B054PNL BOARD
This board has a power switch (push-lock), RESET switch and LED
indicators (OPERATE, READY, ERROR).
B054ISN BOARD
Name
CCD sensor
ILX734K
Location
IC1
ADC
AD9807
IC2
Rev. A
Description
Color CCD line sensor
· Effective pixel = 10500x3 lines
· Single side reading system
· Shutter function
A/D converter processing IC
Minimum resolution = 12 bit
2-4
GT-12000
Operating Principles
2.3.2 Power Supply Circuit Operation
Since the power supply circuit board B054PSH for this scanner meets the
universal specification, it can use the rated voltage in the range from 100V
to 240V.
The electrical circuit for the AC input part is designed on the basis of
200V line. In case the input voltage is 200V line level, the ordinary full
wave rectifying system is used. With this system, the voltage is rectified by
the diode bridge DB1 and then smoothed by the serial smoothing
capacitors C11 and C32 to produce approximately 250 VDC.
On the other hand, if the input voltage is 100V line level, the doubled
voltage rectifying system is used instead. With this system, the input AC
current is separated into the following 2 flows; the positive half cycles of
the current flow through the control IC (IC2) (from Pin 2 to Pin 3) via the
diode bridge (DB1) and the smoothing capacitor C11, and the negative
half cycles of the current, however, flow through the smoothing capacitor
(C32) and DB1 via IC2 (from Pin 3 to Pin 2). Through these flows, the
positive and negative AC current are separately charged in the smoothing
capacitors C11 and C32, respectively, and the doubled VDC
(approximately 250 VDC) equivalent to the input voltage of the 200V line
is produced. At power-on, the control circuit (IC2) is activated by the full
wave rectifying system. Then, if the input voltage is 100 VDC line level,
the system is automatically switched to the doubled voltage rectifying
system after certain period set by the circuit constant.
Except for the full wave rectifier circuit/voltage doubler rectifier circuit at
the AC input part, the normal RCC (Ringing Choke Converter) regulator
circuit is used for the rest part of the power supply circuit, and the different
levels of VDC are distributed to corresponding mechanisms, as shown in
Table 2-1:
Positive
Component
DB1
AC input
+
Negative
Component
+
C11
Doubled Voltage
Output
C32
IC2
[AC Input]
100 V = On
200 V = Off
Figure 2-4. Voltage Doubler Rectifier Circuit Operation
Table 2-1. DC Output Power
Output VDC
+5 V
+24 V
+15 V
Rev. A
Application
Logic power lines
q Motor drive power source
q Power source for the lamp (inverter)
+12 V production
(Power used to drive the cooling fan for the shield
compartment which stores B054 MAIN and B054PSH.)
2-5
CHAPTER
3
TROUBLESHOOTING
GT-12000
Troubleshooting
3.1 OVERVIEW
Fatal Error
This chapter describes the troubleshooting which enables you to solve the
problem efficiently when the scanner is operating abnormally. The
remedies for the errors detected by the self-diagnostic function and the
check point for each phenomenon are described in the following sections.
3.1.1 Error Detection by the Self-Diagnostic Function
The self-diagnostic function equipped with this scanner automatically
detects operating status of each part. The abnormal phenomenon
detected by the function and remedies are as follows:
LED Status
READY
ERROR
Remedy
Cause
Operation/Condition
<Defect in the hardware>
· The lamp goes off
· The lamp does not light.
and the scanner
stops operating.
· Scanner is turned on with
the CR unlocked.
· Sets the status bit
“7”.
· Other defects in the
scanner.
Turn the scanner Off and back On or press the
“RESET” switch.
Command Error
LED Status
READY
ERROR
Remedy
Cause
Undefined command
is detected.
Operation/Condition
Ignores the wrong command
/parameter (No change made
for the current settings.), and
returns NACK to wait for the
next command/ parameter.
The error is cleared by the correct command/
parameter.
Option Error
LED Status
READY
ERROR
Remedy
Cause
<Defect in the options>
· The scanner cover is left
open.
· Paper end, etc..
Operation/Condition
Sets the status bit “7”.
Remove the cause of the error.
Communication Error
LED Status
READY
ERROR
Remedy
Rev. A
Cause
Operation/
Condition
The lamp goes
off and the
scanner stops
operating.
üCHECK POINT
[Option Error] is detected when the option is
installed in the operative condition only.
· Wrong procedure/operation is
detected in communication.
· In case of SCSI, communication
stops for over 30 seconds in
any phase other than bus free
phase.
Turn the scanner Off and back On or press the
“RESET” switch.
3-1
GT-12000
Troubleshooting
3.1.2 Troubleshooting
3.1.2.2 Check Points for Abnormal Phenomenon
This section provides test points for each major unit and check points for
each abnormal phenomenon.
See the table below which shows the abnormal phenomenon typically
occurs.
Table 3-1. Abnormal Phenomenon
3.1.2.1 Test Points
Test points for the motors and sensors are shown in the tables below.
Abnormal Phenomenon
Description
15.0 W
The scanner doesn’t operate
at power on.
“Fatal Error” is indicated and.
is not cleared after the
scanner is turned off and
back on
15.5 W
“Communication Error” is
indicated.
“OPERATE” LED does not
light.
CR does not move.
Abnormal movement of
CR, such as crashing into
the frame.
Lamp does not light.
Error when Bi-directional
parallel I/F is used.
Error when the SCSI is
used.
Black lines, White
banding, and so on
Motors
q Condition: Test the motor without any cables connected.
Motor
Test Point
<Cable connector>
Between Pin 1 and Pin3
Between Pin 2 and Pin 4
<Cable connector>
Between Pin 1 and Pin3
Between Pin 2 and Pin 4
Motor (for driving
the mirror)
Motor (for driving
the focusing
mechanism)
Signal Level
Sensors
q Condition: Test with the scanner power on.
Motor
HP sensor (Mirror)
HP sensor
(Lens/CCD)
Test Point
<B054SUB board>
CN6: Pin 1 (Signal)
Pin 2 (GND)
<B054SUB board>
CN4: Pin 1 (Signal)
Pin 2 (GND)
Scanned image is abnormal.
Signal Level
Flowchart
to refer
3-1
3-2
3-3
3-4
3-5
3-6
3-7
Check points for the major units listed for each phenomenon are shown in
the following pages.
H: In the home position
L: Off the home position
H: In the home position
L: Off the home position
CAUTION Be careful not to short-circuit the signals while
checking them.
Rev. A
3-2
GT-12000
Troubleshooting
Flowchart 3-1
Phenomenon: “Operate” LED does not light.
A
Start
Are the
CN1 on the B054SUB
board and the shield
compartment connected
properly?
No
Check the following motors for
the correct resistance:
- Motor (for mirror) : 15.0 Ω
- Motor (for focus) : 15.5 Ω
Connect them properly.
Yes
No
Has the
fuse F1/F2 on the
B054PSH board
blown out?
Yes
Are the resistances correct?
Disconnect the connector
cables from the connectors
CN2/4/5/6/7 on the B054SUB
board.
Yes
Check the motor driver ICs on
the B054MAIN board.
No
Disconnect the cables from the
connectors CN2/4/5/6/7 on the
B054MAIN board, then, with the
scanner power on, check the
connector CN 5 on the B054MAIN
board for the correct voltages shown
below:
Replace the
fuse. Has the fuse
blown again at turning
on the scanner?
<Motor (for mirror) >
Check if the resistance
between Pin 8/6 of IC4/3 and
the GND is infinitive.
Replace the
B054MAIN
board.
No
<Motor(focus)>
Check if the resistance
between Pin 1/15 of IC5/6 and
the GND is infinitive.
Yes
Between Pins 1 and 4 : +24VDC
Between Pins 7 and 4 : + 5 VDC
Between Pins 9 and 10 : +15VDC
Replace the B054PSH
board.
A
Replace the
motor.
Yes
Are they correct?
Yes
Are the outputs all corrects?
No
No
Replace the B054PSH
board.
Rev. A
A
Replace the
B054MAIN
board.
3-3
GT-12000
Troubleshooting
Flowchart 3-2
Phenomenon: CR (Mirror/Lamp) does not move.
A
Start
Is the transportation
screw set to the locking
position?
Yes
Unlock the screw.
Check the following motors for
the correct resistance:
- Motor (for mirror) : 15.0 W
- Motor (for focus) : 15.5 W
No
Turn th scanner off and move the CR
manually to check if it moves smoothly.
Does the CR move abnomrmally?
No
Are the resistances correct?
Yes
The mechanism is
abnormal.
(Needs replacing.)
Yes
Check the motor driver ICs on
the B054MAIN board.
<Motor (for mirror) >
Check if the resistance
between Pin 8/6 of IC4/3 and
the GND is infinitive.
Replace the
B054MAIN
board.
No
With the scanner power On, check the
connector CN5 on the B054MAIN
board for the correct +24 VDC output
from the following :
<Motor(focus)>
Check if the resistance
between Pin 1/15 of IC5/6 and
the GND is infinitive.
Between Pin 1 and Pin 4 : +24 VDC
Yes
Is the correct voltage output?
Rev. A
Yes
Are they correct?
No
No
Replace the
B054PSH board.
Replace the
motor.
A
Replace the
B054MAIN
board.
3-4
GT-12000
Troubleshooting
Flowchart 3-3
Phenomenon: CR moves abnormally. (Crashing into the frame)
Start
Start
Is the transportation
screw set to the locking
position?
Flowchart 3-4
Phenomenon: Lamp does not light.
Yes
Set the screw to
the unlocking
position.
Replace the lamp on the CR.
No
Does the lamp light
normally?
Check the connector CN4 on the B054
MAIN board for the HP signal level.
Is the signal
level "HIGH" when the
CR is at the home
position?
No
Replace the HP
sensor (for mirror).
Yes
Lamp is
defective.
No
Replace the inverter board on the CR.
Yes
Replace the
B054MAIN board.
Yes
Does the lamp light normally?
Inverter board
is defective.
No
Replace the
B054MAIN board.
Rev. A
3-5
GT-12000
Troubleshooting
Flowchart 3-5
Phenomenon: “Communication Error”” (Bi-directional I/F) is indicated.
Start
Flowchart 3-6
Phenomenon: “Communication Error”” (SCSI) is indicated.
Start
Check the SCSI for the following
settings:
Replace the interface cable.
- Terminator setting
- SCSI ID setting Does the scanner
operate normally?
Yes
Replace the I/F cable.
No
Are the settings correct?
No
Set them
correctly.
Yes
Repace the
B054MAIN board.
Replace the I/F cable.
Does the scanner
operate normally?
Yes
I/F cable is
defective.
No
Replace the
B054MAIN board.
Rev. A
3-6
GT-12000
Troubleshooting
Flowchart 3-7
Phenomenon: Scanned image is abnormal.
Start
Is the glass free of stain
and foreign matter?
No
Clean the
glass.
Yes
Is the mirror free of stain
and foreign matter?
No
Clean the
mirror.
Wipe the mirror with
a dry, clean cloth only.
Yes
Replace the B054MAIN board and
perform a test scanning.
Yes
Is the image normal?
B054MAIN
board is
defective.
No
The mechnasim is
defective.
(Needs replacing.)
Rev. A
3-7
GT-12000
Troubleshooting
3.1.3 Troubleshooting for Electrical Circuit
This section describes the abnormal phenomenon and corresponding
check points for each electrical circuit board.
3.1.3.1 Power Supply Board (B054PSH Board)
Phenomenon
<Abnormal voltage>
+5VDC is not output.
<Abnormal voltage>
+24 VDC is not output.
<Abnormal voltage>
+15 VDC in not output.
Rev. A
Check Points
Check IC51 (TL494):
· Signal waveform output from
Pin 8/11 (chopping waveform)
Check the Switching FET/Q1:
· Waveform at the drain
Check IC52 (78M15):
· Signal waveform output from
Pin 1
3-8
GT-12000
Troubleshooting
3.1.3.2 Control Circuit Board (B054MAIN Board)
Phenomenon
<No operation at all>
Check Points
Check the reset IC (IC2) for the signal
waveforms output from the following pins:
Reset IC is defective.
· Pin 7 (for +5V input)
· Pin 6 (for PWRES output)
<No operation at all>
Check the CPU (IC13) for the ROM
access signal waveforms output from the
following pins:
ROM access is bad.
· Pin 104 (for CS0 signal)
· Pin 78 (for RD signal)
<No operation at all>
Check the clock signal waveform input to
the following pin:
CPU is defective.
· Pin 75 (for XTAL input)
Rev. A
3-9
GT-12000
Troubleshooting
Phenomenon
<”Fatal Error”>
Check Points
Check the Driver IC (IC3/4:
Motor (for mirror) driver circuit
is defective.
· Phase drive signal waveform
output from Pin 8/6
<”Fatal Error”>
Check the driver IC (IC5/6):
Motor (for focus) driver circuit
is defective.
· Phase drive signal waveform
output from Pin 1/15
<”Fatal Error”>
· Check if the signal waveform
input to Pin 91 of CPU (IC13)
changes in accordance with the
CR position.
Check the following for the lamp
signal output:
CR does not stop at the home
position.
<”Fatal Error”>
Lamp does not light.
· Output from Pin 166 of ASIC
(IC24)
· Emitter waveform at Tr (Q1)
<”Fatal Error”>
Check ASIC (IC28):
White standard level is not
read properly.
· Signal waveform output from
Pin 161
<”Communication Error”>
Main cause: ASIC (IC28) is
defective. (Replace IC28 or
B054MAIN board.)
Main cause: ASIC (IC24) is
defective. (Replace IC24 or
B054MAIN board.)
Bi-directional I/F / SCSI I/F
<Image is read abnormally>
Rev. A
3-10
CHAPTER
4
DISASSEMBLY AND ASSEMBLY
GT-12000
Disassembly and Assembly
4.1.2 Screws
4.1 OVERVIEW
This chapter describes how to disassemble this scanner. Unless otherwise
specified, assembly can be accomplished by following disassembly
procedures in reverse order.
Screws used in this scanner are listed in the table below. Be sure to use
the correct types and numbers of screws for each part when assembling
the scanner.
Table 4-2. Screw List
WARNING n Be sure to disconnect the power cable from the
AC power socket prior to servicing.
n Since this scanner weighs heavy
(approximately 20 Kg), it must be carried by
2 people.
CAUTION n Never disassemble any scanner parts unless
specified to do so, because this scanner
mechanism needs assembling and adjusting
rather exactly to preserve accurate control
system at its satisfactory level.
n Get yourself enough room for servicing,
considering the size of the scanner.
n Since this scanner weighs as heavy as
approximately 20 kg, be sure to perform
servicing on a heavy-duty, level table.
n Make sure that the “CR fixing knob” is set to
the locking position to fix the CR by the rear
before packing the scanner.
4.1.1 Tools
No.
Screw Type /
Specification
1
CBP M4x12
Silver
2
CB M4x10
Gold
3
CBS M3x6
Red copper
4
CB M3x4
Gold
5
CBP M3x8
Gold
6
CB M3x6
Gold
7
CB M3x12
Black
Tools used for servicing are as listed in the table below:
Table 4-1 .Tool List
Description
Exclusive adjusting tools
(Leveling tools)
Phillips screw driver (No.2)
Standard screw driver (No.1)
Tweezers
Rev. A
Availability
SE Part No.
EPSON exclusive
Code: 1039140
¡
¡
¡
–
–
–
Appearance
Color
8
CR;B damper shaft
(Thread part: M3x3)
Gold
9
CP M3x6
Silver
10
Screw lock screw
(Diagonal: 5 mm)
Silver
4-1
GT-12000
4.2 DISASSEMBLY PROCEDURES
This section describes disassembling and removing procedures for each
major unit of the scanner.
See the flowchart in Figure 4-1. The jobs in the yellow boxes involve using
the adjustment tools exclusively designed for this scanner. Therefore,
make sure that you read the instruction for the section to refer to carefully
to figure out the procedure before servicing.
Disassembly and Assembly
Start
Electrical Circuit
Remova
(Section 4.2.1)
EPROM Replacement
(Section 4.2.1.1)
MAIN/Power Supply Board
Removal (Section 4.2.1.2)
Scanner Body
Disassembly
(Section 4.2.2)
Upper Housing Removal
(Section 4.2.2.1)
Mechanism Removal
(Section 4.2.2.2)
Scanner Mechanism
Dsassembly
(Section 4.2.3)
Panel Board Assembly Removal
(Section 4.2.3.1)
Sub Board Assembly Remvoal
(Section 4.2.3.2)
HP Sensor (CR) Removal
(Section 4.2.3.3)
Motor (CR) Assembly Removal
(Section 4.2.3.4)
Glass Frame Assembly Removal
(Section 4.2.3.5)
Lamp/Inverter Board Assembly
Removal (Section 4.2.3.6)
HP Sensor (AF)
Removal (Section 4.2.3.7)
Option Frame Assembly
Removal (Section 4.2.3.9)
Figure 4-1. Procedure for Disassembling the GT-12000
Rev. A
4-2
GT-12000
Disassembly and Assembly
4.2.1 Electrical Circuit Removal
The major electrical circuit boards (B054MAIN and B054PSH) of this
scanner are all stored in one independent shield compartment. Therefore,
they can be removed in one unit (board unit) from the scanner with ease.
1. Disconnect the AC power cable from the scanner.
2. Remove 3 screws (No.5) securing the shield compartment which
contains the electrical circuit boards at the back of the scanner. Then
take out the compartment from the scanner to remove.
üCHECK POINT
For easy removal, insert a driver or equivalent
into the bail lock of the interface and pull it.
S c re w (N o .5 )
T a k e o u t
Figure 4-2. Shield Compartment Removal
4.2.1.1 EPROM Replacement
In case of EPROM replacement, remove the ROM cover attached on the
board unit.
1. Remove the board unit. (See Section 4.2.1.)
2. Remove 1 screw (No.3) fixing the ROM cover, and remove the cover.
3. Remove the EPROM from the IC socket and install a new EPROM.
Screw (No.3)
CAUTION When installing the ROM, make sure that the leads
are not bent and the ROM is installed in the right
direction.
ROM Cover
Figure 4-3. ROM Cover Removal
Rev. A
4-3
GT-12000
Disassembly and Assembly
4.2.1.2 MAIN/B054PSH Board Removal
Connector (CN5)
Connector (CN9)
B054MAIN and B054PSH boards stored in the shield compartment are
removed in the following procedure:
1. Remove the shield compartment. (See Section 4.2.1.)
2. Remove 12 screws (No.3) securing the top shield of the board unit,
then remove the top shield.
B054MAIN Board
3. [MAIN board assembly removal]
Disconnect the connector cables from the connector CN5 and CN9 on
the MAIN board.
4. Remove the following screws securing the MAIN board, and remove
the MAIN board:
Ÿ 6 screws (No.3):
Ÿ 6 screws (No. 9):
Ÿ 2 screws (No.10):
.
Fixing the board along the edges.
Securing the I/F connector.
Securing the optional I/F connector.
Screws (No.3)
Figure 4-5. MAIN Board Removal
5. [Power supply board assembly removal]
Remove the connector cables from the connector CN1 on the power
supply board assembly and the connector CN5 on the MAIN board
assembly.
6. Remove 6 screws (No.3) securing the power supply board assembly
and remove the power supply board.
Connector (CN5)
B054PSH Board
S c re w
(N o .9 )
S c re w L o c k S c re w
(N o .1 0 )
Figure 4-4. I/F Connector Fixing Screw Removal
Screws (No.3)
Connector (CN1)
Figure 4-6. Power Supply Board Removal
Rev. A
4-4
GT-12000
Disassembly and Assembly
4.2.2 Scanner Body Disassembly
U s in g th e tw e e z e r s , r e m o v e th e c a p
b y liftin g it u p w h ile p u s h in g it to w a r d
th e o th e r s id e o f th e c u to u t.
This section describes procedures for disassembling the major units of the
scanner.
C r o s s - s e c tio n
CAUTION When removing the CR fixing knob or screw caps,
be careful not to damage the upper housing.
4.2.2.1 Upper Housing Removal
1. Remove the document cover.
2. Using tweezers, remove the CR fixing knob attached to the left side of
the scanner.
3. Remove 4 screws (2 for each of No1 and No.2) securing the upper
housing to the chassises on the scanner. Note that the front 2 screws
are covered with the screw caps. Using tweezers, pinch them out prior
to removing the screws.
4. Lift up the upper housing to remove it.
üCHECK POINT
When installing the upper housing, make sure
that the optical plate is installed on the specified
position.
S c re w
C a p
B e c a re fu l n o t to d a m a g e
th e u p p e r h o u s in g .
Figure 4-7. Screw Cap Removal
S c re w C a p
S c re w s (N o .1 )
S c re w s (N o .2 )
S c re w C a p
O p tic a l P la te
In n e r S id e o f th e
U p p e r H o u s in g
C R F ix in g K n o b
Figure 4-8. Upper Housing Removal
Rev. A
4-5
GT-12000
Disassembly and Assembly
4.2.2.2 Scanner Mechanism Removal
The scanner mechanism can be removed from the lower housing in the
following procedure:
Screws (No.1)
1. Remove the upper housing. (See Section 4.2.2.1.)
2. Remove 4 screws (No.1) securing the scanner mechanism to the lower
housing at the bottom. Then remove the mechanism from the lower
housing.
üCHECK POINT
n Note the following when installing the scanner
mechanism:
1) Remove the key tops for the power switch
and reset switches from the lower housing.
2) Install the scanner mechanism to the lower
housing.
3) Reinstall the key tops.
n Place the removed mechanism on flat stable
surface.
Scanner Mechanism
Front Side of the Scanner
Figure 4-9. Scanner Mechanism Removal
Rev. A
4-6
GT-12000
Disassembly and Assembly
4.2.3 Scanner Mechanism Disassembly
The rest part of the chapter describes the procedures for removing the
major parts/units in the scanner mechanism.
CAUTION Note that producing this scanner requires rather
precise assembly and adjustment to ensure
accurate control system. Therefore, never
disassemble any scanner parts unless specified to
do so.
Panel Board Assembly
4.2.3.1 Panel Board Assembly Removal
1.
2.
3.
4.
Remove the scanner mechanism. (See Section 4.2.2.2.)
Turn the mechanism over and place it on a flat surface.
Disconnect all connector cables from the panel board assembly.
Remove 2 screws (No.6) securing the panel board assembly and
remove it.
üCHECK POINT
Unit arrangement at the bottom of the mechanism
is as shown below.
Motor (CR) HP Sensor (CR)
HP Sensor (AF)
Rev. A
Screws (No.6)
Figure 4-10. Panel Board Assembly Removal
Panel Board Assembly
Sub Board Assembly
4-7
GT-12000
Disassembly and Assembly
4.2.3.2 Sub Board Assembly Removal
1. Remove the scanner mechanism. (See Section 4.2.2.2.)
2. Turn the mechanism over and place it on a flat surface.
3. Disconnect all connector cables from the sub board assembly
(B054SUB board).
4. Remove 2 screws (No.3) securing the board to the bracket and remove
the sub board.
üCHECK POINT
Sub Board Assembly
When placing the scanner up side down, lay a
clean soft cloth under the scanner to protect the
glass surface.
Screws (No.6)
Figure 4-11. Sub Board Assembly Removal
Rev. A
4-8
GT-12000
Disassembly and Assembly
4.2.3.3 HP Sensor (CR) Removal
This section describes procedure for removing the HP sensor which
detects the reference position for the carriage mirror assembly.
1.
2.
3.
4.
Motor (CR)
HP Sensor (CR)
Panel Board Assembly
Remove the scanner mechanism. (See Section 4.2.2.2.)
Move the carriage mirror assembly away from the HP (home position).
Turn the mechanism over and place it on a flat surface.
Release the hook fixing the HP sensor at the bottom of the mechanism
and remove the HP sensor unit. Then disconnect the connector cable
from the removed HP sensor.
HP Sensor (AF)
Sub Board Assembly
Figure 4-12. HP Sensor (CR) Removal
Rev. A
4-9
GT-12000
Disassembly and Assembly
4.2.3.4 CR Motor Assembly Removal
This section describes procedure for removing the motor unit which drives
the carriage mechanism (mirror/lamp).
1. Remove the scanner mechanism. (See Section 4.2.2.2.)
2. Turn the mechanism over and place it on a flat surface.
3. Unhook the torsion spring from the tension lever assembly, then
remove 1 screw (No.6) to remove the tension lever assembly.
4. Disconnect the cable for the motor from the relay connector and
remove 4 CR damper shafts; B (No.8) securing the motor, then remove
the motor.
üCHECK POINT
Bottom of the Scanner Facing Upward
Tension Lever Assembly
Motor (CR) Assembly
When assembling, hook the spring to the tension
lever assembly first, then fasten the screw.
Torsion Spring
CR Damper Shafts ;B
(No.8)
Screw (No.6)
Figure 4-13. CR Motor Assembly Removal
Rev. A
4-10
GT-12000
Disassembly and Assembly
4.2.3.5 Glass Frame Assembly Removal and Pre-operation
Since the glass frame assembly is one of the reinforcing parts of the
mechanism, whole mechanism may be deformed if it is removed. Be sure
to follow the instruction provided in this section during any service which
involves removing the glass frame assembly.
T u r n in g T a b le
( w ith 4 d e v is io n s )
CAUTION Be aware the following when removing the
document glass during any service:
n Always set the scanner on the adjusting tools
exclusively designed for this scanner.
n Set the scanner on a stable, level table.
n Make sure that the scanner mechanism is
installed to the lower housing while servicing.
n Be sure to fit all the rubber foot at the bottom
of the scanner in the top indents of the stages
and the adjuster. (Any of the foot must not be
placed over the top surface of the tool.)
1. Remove the upper housing. (See Section 4.2.2.1.)
2. Refer to the figures in the right column and set the adjusting tools
(leveling tools) under the scanner to level the scanner, as instructed
below:
1) Set the scanner on 3 stages, making each of the specified feet of
the scanner sit on the corresponding stage.
2) Set the adjuster under the rubber foot in the front right corner of the
scanner bottom, aligning the center of the adjuster with the one of
the rubber foot. Make sure that you can see the groove on the
adjuster when it is set.
3) Hold the base of the adjuster with a hand and spin the table to
make it reach the bottom of the scanner by its own forth.
4) Turn the table [2 quarters] manually, which can be measured by 4
divisions on the table and the groove on the base, to push the table
up from the position where the table was moved up to by the spin.
5) After adjusting, make sure that each corner of the scanner is
securely in contact with the corresponding tool.
Note: Directions are described when the scanner is viewed from the front.
B a s e
( w it h 1 g r o o v e )
S ta g e
( 3 p ie c e s )
A d ju s te r
Figure 4-14. Adjusting Tools
S ta g e
( S e t in th e fr o n t le ft, r e a r
r ig h t a n d r e a r le ft c o n e r s .)
A d ju s te r
( S e t in th e fr o n t
r ig h t c o n e r .)
T u
to
a n
h e
rn
m o
d d
ig h
th e tu r n in g ta b le
v e th e ta b le u p
o w n to a d ju s t
t.
Figure 4-15. Tool Position and Adjusting Method
<Continued to the next page.>
Rev. A
4-11
GT-12000
Disassembly and Assembly
3. Remove 9 screws and remove the glass frame assembly. The screws
to be removed and their locations are as follows:
· No.4: 5 screws securing the glass frame assembly by the right
and left sides.
· No.1: 2 screws securing the glass frame assembly by the rear
edge.
· No.3: 2 screws securing the glass frame assembly by the front
edge.
Note: Directions are described when the scanner is viewed from
the front.
Glass Fixing Plate
(Color : Silve)
Screws (No.1)
Screws
(No.4)
Screws
(No.4)
CAUTION When reinstalling the glass frame assembly, refer
to Section 4.2.3.5.1 to set the glass frame assembly
on the correct position. Failure in this operation
will cause the CR to start scanning at a wrong
position.
Glass Frame Assembly
Screws (No.3)
Glass Fixing Plate
(Color : Silve)
Front Side of the Scanner
Figure 4-16. Glass Frame Assembly Removal
Rev. A
4-12
GT-12000
Disassembly and Assembly
4.2.3.5.1 Glass Frame Assembly Installation
After the glass frame assembly has been removed for any purpose, it
must be reinstalled in the following procedure.
1. Place the glass frame assembly to the specified position in the scanner
mechanism.
2. Referring to the Figure 4-17, determine the installation position for the
glass frame assembly.
G la s s e d g e
P o s itio n in g B u s h
( C o lo r : S ilv e r )
F r a m e P o s itio n in g
B u m p
1) Push the whole glass frame assembly from the front against the
positioning bushes (color: silver) on the top side of the rear frame.
(Glass edge is in contact with the bushes with this operation.)
2) Keeping the glass frame assembly in contact with the bushes, move
the assembly left to push it against the positioning bump on the top
surface of the left side frame.
3. When the glass frame assembly is correctly positioned, fix it with 9
screws.
üCHECK POINT
When installing the glass frame assembly, ensure
that 4 glass fixing plates are properly positioned.
(See Figure 4-16.)
G la s s F r a m e A s s e m b ly
S c a n n e r F r o n t S id e
Figure 4-17.
Determining the Glass Frame Assembling Installation position
Rev. A
4-13
GT-12000
Disassembly and Assembly
4.2.3.6 Lamp Assembly and Inverter Board Assembly Removal
This section describes how to remove the lamp assembly and the inverter
board assembly from the carriage.
<Continued to the following page.>
CR Mirror Cover
1. Remove the glass frame assembly. (See Section 4.2.3.5.)
2. Move the CR to the position indicated in Figure 4-19. (The position
where the front and rear frames are indented.)
3. Remove 2 screws (No.6) securing the carriage mirror cover and slide
the cover toward the rear side of the scanner to release the
engagement with the hook on the carriage. Then lift up the cover and
remove it.
Screws (No.6)
Figure 4-18. CR Mirror Cover Removal
Rev. A
4-14
GT-12000
Disassembly and Assembly
4. Disconnect the connector cable for the lamp from the connector CN2
on the inverter board assembly. Then remove the lamp from the
carriage.
5. Disconnect the cable (black) from the connector CN1 on the inverter
board assembly. Then remove the bracket (silver) fixing the ferrite core.
6. Remove 2 screws (No.6) securing the inverter board assembly.
7. Slide the inverter board assembly toward the front side of the scanner
to release the engagement with the hook on the carriage. Then remove
the inverter board.
üCHECK POINT
Lift up to remove.
CN2
When assembling, make sure that the cover is
securely engaged with the hook on the carriage.
C o v e r
R e a r
C a r r ia g e B a s e
F ro n t
Inverter Board
Lamp
H o o k
Cut Part
of the Board
CN1
Screws (No.6)
Figure 4-19.
Lamp Assembly and Inverter Board Assembly Removal
Rev. A
4-15
GT-12000
Disassembly and Assembly
4.2.3.7 HP (AF) Sensor Removal
This section describes the procedure for removing the HP sensor which
detects the reference position for the AF drive mechanism (lens/CCD
sensor unit).
1. Remove the glass frame assembly. (See Section 4.2.3.5.)
2. Remove 4 screws (No.3) securing the AF drive mechanism cover which
covers the AF drive mechanism and remove the cover.
3. Rotate the screw pulley at the end of the screw shaft (a thread shaft)
manually to move the detection flag to the area where it does not
overlap with the HP sensor.
4. Release the hook fixing the HP sensor and remove it, then disconnect
the cable from the sensor.
Rotate this pulley manually.
HP Sensor (AF)
Screws (No.3)
Cover
Detection Flag
Figure 4-21. HP Sensor (AF) Removal
Figure 4-20. AF Drive Mechanism Cover Removal
Rev. A
4-16
GT-12000
Disassembly and Assembly
4.2.3.8 AF Motor Assembly Removal
Screws (No.4)
This section describes how to remove the motor which drives AF drive
mechanism.
1. Remove the glass frame assembly. (See Section 4.2.3.5.)
2. Remove 4 screws (No.3) and remove the cover which covers the AF
drive mechanism.
3. Remove 2 screws (No.6) and remove the tension plate assembly,
spring plate and fixing tension plate to loosen the timing belt.
4. Disconnect the cable for the motor from the relay connector, then
remove 4 screws (No.4) securing the motor and remove the motor.
Screws (No.6)
Tension Plate Assembly
Fixing Tension Plate
Motor Assembly (AF)
Figure 4-23. AF Motor Assembly Removal
CAUTION You are required to set the timing belt with a
Spring Plate
special care while installing the AF motor
assembly. Be sure to follow the instruction
provided in the next page to set the timing belt
peoperly.
Figure 4-22. Tension Plate Assembly Removal
Rev. A
4-17
GT-12000
Disassembly and Assembly
4.2.3.9 AF Motor Assembly Installation
Follow the steps below when installing the AF motor assembly to the
scanner body.
üCHECK POINT
When installing the tension plate assembly, make
sure that the location bump is not covered with the
plate.
1. Engaging the timing belt with the pinion gear of the motor, install the
motor to the frame with 2 screws (No. 4).
2. Mount the sprint plate, fixing tension plate, and the tension plate
assembly, and fix them with 2 screws (No. 6) temporarily. Ensure that
the tension plate assembly is upheld by this operation.
3. Turning the screw pulley attached to the screw shaft end manually,
loosen the screw fixing the tension plate assembly to tense the belt,
then fasten the screw again.
T e n s io n P la te A s s e m b ly
CAUTION When fixing the tension plate assembly, be careful
not to apply excessive tension, since it may cause
the motor to rotate improperly.
S c re w s
(N o . 6 )
F ix in g T e n s io n P la te
S p r in g P la te
S c r e w P u lle y
( r o ta te d c o u n te r c lo c k w is e )
Figure 4-25. Timing Belt Tension
T e n s io n P la te A s s e m b ly
Figure 4-24. Tension Plate Assembly
Rev. A
4-18
CHAPTER
5
ADJUSTMENT
GT-12000
Adjustment
5.1 OVERVIEW
This scanner requires no adjustment for any service such as
disassembling and assembling the scanner including part replacement is
provided within the specification in Chapter 4 “Disassemble and
Assembly”.
Rev. A
5-1
CHAPTER
6
MAINTENANCE
GT-12000
Maintenance
6.1 OVERVIEW
This chapter provides information necessary to keep the scanner function
in optimum condition constantly and to prevent troubles.
6.1.2 Lubrication
This scanner needs no lubrication at the level of service specified in the
service manual.
6.1.1 Cleaning
Perform cleaning when stain is noticeable. Stain on the document glass,
particularly, has direct effect on scanned image. Therefore, be sure to
clean the glass well to remove stain thoroughly.
CAUTION Never apply any organic solvent such as thinner
and benzine , since these may deteriorate plastic
and rubber parts.
q Outer cases
Wipe stain off with a clean cloth which is moistened with water and
then squeezed tightly. To remove severe stain, use neutral detergent.
q Document glass
Remove dust and paper debris with a dry clean cloth. If stain is severe
or foreign matter is stuck, use a cloth absorbed with neutral detergent.
If trace is left, wipe it off well with a dry, clean cloth again.
CAUTION If you need to clean the reverse side of the glass,
be sure to remove the glass using the specified
adjusting tools.
Rev. A
6-1
CHAPTER
7
APPENDIX
GT-12000
Appendix
7.1 OVERVIEW
7.1.2 Connector Summary
This chapter provides information necessary for servicing.
Connectors used on the electrical circuit boards are summarized in the
table below.
7.1.1 Connector Pin Assignment
Table 7-1. Connector Summary
S c a n n e r M e c h a n is m
B 0 5 4 P N L
B o a r
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