Epson GT-7000 Photo User manual

EPSON
EPSON
EPSON France S.A. GT-7000
SERVICE MANUAL

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EPSON GT-7000
4009736
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NOTICE
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.

The contents of this manual are subject to change without notice.

All effort have been made to ensure the accuracy of the contents of this manual. However, should any errors be deteced, SEIKO EPSON would greatly
appreciate being informed of them.

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 SECOND-
SOURCE 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-7000. 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. Date Page(s) Contents
A 1998/09/21 All First release
B 1998/09/25 57,60 Parts List(Table7-13) on page 57 is modified and Exploded
Diagram for TPU is added on page 60.
C 1998/11/23 62-82 Pages(62-82) about ADF are added.

EPSON GT-7000
Rev. C 1
Table of Contents
Product Description
Overview .............................................................................................................. 4
Specification......................................................................................................... 4
Interface Specification.......................................................................................... 7
SCSI Model................................................................................................... 7
USB Model.................................................................................................... 9
Control Codes..................................................................................................... 10
Control Specification.......................................................................................... 11
Switch Specification.................................................................................... 11
LED Indicators............................................................................................ 11
Switch Setting ............................................................................................. 11
Error Indication ........................................................................................... 12
Operating Principles
Engine Mechanism............................................................................................. 15
Carriage Unit............................................................................................... 15
Carriage Move Mechanism......................................................................... 16
Power Supply Circuit .................................................................................. 17
Control Circuit............................................................................................. 19
Control Circuit Overview .................................................................................. 19
Troubleshooting
Overview ............................................................................................................ 23
Self-Diagnostic Function.................................................................................... 23
Troubleshooting.................................................................................................. 24
Disassembly and Assembly
Overview ............................................................................................................ 29
Precaution.................................................................................................... 29
Tools............................................................................................................ 29
Screws ......................................................................................................... 29
Disassembly Procedures..................................................................................... 31
Carriage Lock Release ................................................................................ 31
Document Cover Removal.......................................................................... 32
Upper Cover Removal................................................................................. 33
Inverter Lamp/Inverter Board Removal...................................................... 34
Carriage Unit Removal ............................................................................... 36
Carriage Motor/Timing Belt Removal........................................................ 41
Main Board Removal.................................................................................. 43
Panel Board Removal.................................................................................. 45
Power board Removal................................................................................. 46
Adjustment
Maintenance
Overview............................................................................................................ 51
Cleaning ...................................................................................................... 51
Lubrication.................................................................................................. 51
Appendix
Overview............................................................................................................ 54
Interconnection............................................................................................ 54
Connector Assignment (SCSI).................................................................... 55
Parts List............................................................................................................. 57
Optional Part; ADF ............................................................................................ 62
General Description .................................................................................... 62
Specification................................................................................................ 62
General Specification ........................................................................................ 62
Efficiency .......................................................................................................... 62
Document .......................................................................................................... 63
Electrical Specification ...................................................................................... 63
Environmental Conditions ................................................................................. 63
Reliability .......................................................................................................... 63
Operating conditions ......................................................................................... 63
Safety, EMC, EPA ............................................................................................. 63
Resistance to electric noise ................................................................................ 64
Physical Dimensions and Weight ...................................................................... 64
Interface....................................................................................................... 65
Disassembly........................................................................................................ 66

EPSON GT-7000
Rev. C 2
B81314 Main Board Removal..................................................................... 66
ASF Part...................................................................................................... 67
Disassembly of ASF Part ................................................................................... 68
Gear Frame ........................................................................................................ 69
Disassembly of ASF and Frame.................................................................. 72
ASF Disassembly........................................................................................ 74
Parts List............................................................................................................. 75
ADF Exploded Diagram..................................................................................... 77

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PRODUCTDESCRIPTION

EPSON GT-7000 Chapter 1 Product Description
Rev. A 3
1.1 Overview
Major feature of GT-7000 is as follows.
 High quality: 600 dpi, 12bit(12bit-in, 8bit-out)
 High speed: Color 8.1 msec/line, Monochrome 2.7msec/line
 Small size: 287(W) x 425(D) x 88(H) mm (4.5Kg)
 Option: Exclusive TPU and ADF available
 Command level: ESC/I-B7
AAS
 I/F: SCSI
USB
Figure 1-1. Exterior view of GT-7000
1.2 Specification
GENERAL
 Product type: Flatbed color image scanner
 Sub-scanning method:Movement of the Scanning Head
 Photoelectric device:Color CCD Line Sensor
 Maximum Read Area:8.5 x 11.7” (216 x 297 mm)
 Maximum effective picture element: 5100x7020 pixels (600 dpi)
 Scanning Resolution: main 600 dpi
sub 1200 dpi
 Output resolution: 50 ~ 4800 dpi(1dpi step)
(4800 dpi reading with 200% makes 9600dpi
reading with 16368 pixel limit in main scan)
 Scanning Speed: Color 8.1 msec/line
(600 dpi, Draft Mode) Monochrome(bi-level)2.7 msec/line
 Color separation: By the color filter of CCD
 Command Level: ESC/I-B7
 Zoom: 50% to 200%(1% step)
 Pixel depth: 8bits/pixel(Input 12bits/pixel, Output 8bits/
pixel)
 Gamma Correction: CRT 2 level(A, B)
PRINTER 3 levels (A,B,C)
User defined 1 level

EPSON GT-7000 Chapter 1 Product Description
Rev. A 4
 Color Correction: Impact-Dot Printer
Thermal Printer
Ink-jet Printer
CRT Display
User defined
 Brightness: 7 levels
 Line Art: Fixed threshold
TET
 Digital halftoning: AAS
Error Diffusion 3 modes(A,B,C)
 Bi-level, Quad-level: Dither(Resident)4 modes(A,B,C,D)
Dither(User defined) 2 modes(A,B)
 Interface(Resident): Either one of them below;
SCSI Model ; 50-pin Half pitch Connectors
USB Model ; Type-B Receptacle Connector
 Line Source: White Cold cathode Fluorescent Lamp
 Option: TPU, ADF
ELECTRICAL SPECIFICATION
 Rated Voltage: AC100-120V
AC220-240V
 Input Voltage: AC 100-120V ± 10%
AC 220-240V ± 10%
 Rated Current: 0.5A (Input AC 100V)
0.3A (Input AC 200V)
 Rated Frequency Range: 50-60Hz
 Input Frequency Range: 49.5-60.5 Hz
 Power consumption: Approx. 20W
 Insulation resistance: 10 M Ω at 500VDC
(between AC line and chassis)
 Dielectric strength: AC 1.5kV, 1 min
(between AC Line and chassis)
SAFETY, EMC
 Safety: UL1950 (UL)
CSA C22.2 No.950 (CSA)
EN60950 (VDE)
EN60950 + Nordic deviation (NEMKO)
IEC950 (ROTEST, PSB)
 EMC FCC Part15 Subpart B Class B
CSA C108.8 Class B
AS/NZS3548 Class B
CISPR Pub22 Class B
CNS13438 Class B
 CE Marking
Low Voltage Directive 73/23/EEC EN60950
EMC Directive 89/336/EEC EN55022 Class B
EN61000-3-2
EN61000-3-3
EN50082-1
IEC 801-2/801-3/801-4
RESISTANCE TO ELECTRIC NOISE
 Static electricity: Panel-10kv
metal-7kv / 150pF, 150Ω

EPSON GT-7000 Chapter 1 Product Description
Rev. A 5
ENVIRONMENTAL CONDITION
 Temperature: Operating: 5°C to 35 °C
Storage: -25 °C to 60 °C
 Humidity: Operating: 10 to 80%, no condensation
Storage: 10 to 85%, no condensation
RELIABILITY
 Main Unit: MCBF 30,000 cycle
OPERATING CONDITIONS
 Dust: Ordinary office or home conditions.
Extreme dust should be avoided.
 Illumination: Operation under direct sunlight or near
storng light source is not guaranteed and
should be avoided.
DOCUMENT
 Reflective type: Documents which has a smooth surface
 Transparency type: (With transparency unit)
Reversal film
Negative film
DIMENSION
 Dimension: 287(W) x 425(D) x 88(H) mm
Refer to figure 1-2.
 Weight: 4.5 Kg
Figure 1-2. Dimension of GT-7000

EPSON GT-7000 Chapter 1 Product Description
Rev. A 6
1.3 Interface Specification
1.3.1 SCSI Model
Any item not included in this specification shall be in compliance with
ANSI X3T9.2/375R Revision 10L(SCSI 2).
 Function: Following functions are available, which are included in
ANSI X3T9.2/375R Revision 10L(SCSI 2).
1. Bus free phase
2. Arbitration phase
3. Selection/Re-selection phase
4. Command phase
Note) The LUN(Logical Unit Number) is fixed at “0” in this device.
The command Link Function is not supported.
5. Data phase
Data in phase
Data out phase
6. Status phase
7. Message phase
Message in phase
Message out in phase
8. Attention condition
9. Reset condition
 Electric specification
Compliant to ANSI X3T9.2/375R Revision 10L (SCSI 2)
signal ended
 Connector: Two 50-pin connectors (see figure1-3.)
 Terminator: Internal terminator
Enable to control “active” or “inactive” by a switch.
(SW=ON---terminator available)
 SCSI ID The SCSI ID is set with a rotary switch on the rear
panel. The switch numbers are corresponded to the
available address and can be set from 0 to 7. Others
are reserved.
Factory setting ID=2
Figure 1-3. SCSI Connector Pin Assignment

EPSON GT-7000 Chapter 1 Product Description
Rev. A 7
Table 1-1. SCSI Connector Pin Assignment
Signal I/O Pin
No.(50) Description
GND 1~12
14~25
35~37
39, 40
42
NC 13
DB0 I/O 26 Data Bus 0
DB1 I/O 27 Data Bus 1
DB2 I/O 28 Data Bus 2
DB3 I/O 29 Data Bus 3
DB4 I/O 30 Data Bus 4
DB5 I/O 31 Data Bus 5
DB6 I/O 32 Data Bus 6
DB7 I/O 33 Data Bus 7
DBP I/O 34 Data Bus Parity
TERMPWR 38 Terminator Power
ATN I 41 Attention
BSY I/O 43 Busy
ACK I 44 Acknowledge
RST I 45 Reset
MSG O 46 Message
SEL I/O 47 Select
C/D O 48 Command/Data
REQ O 49 Request
I/O O 50 Input/Output

EPSON GT-7000 Chapter 1 Product Description
Rev. A 8
1.3.2 USB Model
Any items not included in this specification shall be in compliance with
Universal Serial Bus Specification Revision 1.0.
 Configuration
This device supports the following configurations.
Table 1-2. Configuration
 Electric specification
Compliant to Full Speed mode (12Mbit/s) of Universal Serial Bus
Specification Revision 1.0
 Connector
One Receptacle (Series B)
Figure 1-4. Receptacle (Series B)
 Connector Pin Assignment
Table 1-3. Connector Pin Assignment
Element Description
Device Class: Imaging ([TBD] Vendor specific)
Subclass: Scanner ([TBD] Vendor specific)
Protocol: Pass Through ([TBD] Vendor specific)
Maximum packet size for endpoint 0:64 byte
Vendor ID:0x04B8 (Seiko EPSON Corp.)
Product ID:0x0101
Number of possible configurations:1
Configuration Number of interfaces supported by this configuration:1
Characteristics: Self-powered
Remote wake up feature supported
Maximum of possible consumption:0mA
Interface No Alternate setting
Number of endpoints used by this interface(excluding
endpoint 0):2
Class:Imaging ([TBD] Vendor specific)
Subclass: Scanner ([TBD] Vendor specific)
Protocol:Pass Through ([TBD] Vendor specific)
Endpoint 1 Bulk IN transfer
Maximum data transfer size:64 byte
Endpoint 2 Bulk OUT transfer
Maximum data transfer size:64 byte
String Descriptor iManufacturer: “EPSON”
iProduct: “Perfection 636”
Pin No. Signal
1VCC
2-Data
3+Data
4GND

EPSON GT-7000 Chapter 1 Product Description
Rev. A 9
1.4 Control Codes
The command level of this scanner is ESC/IB-8. The commands
supported are shown in the table below.
Table 1-4. Control Codes
Table 1-5. Control Codes
Category Command Name Code
Execute Command Identity Request ESC I
Status Flag Request ESC F
Extend Status Flag
Request ESC f
Parameter Request ESC S
Scanning Start ESC G
Push Button Status ESC!
Data Format Setting Set Data Format ESC Di
Set Resolution ESC R n1 n2
Set Zooming ESC Hi1 i2
Set Read Area ESC A n1 n2 n3 n4
Set Color ESC Ci
Mirroring ESC Ki
Image Setting Set Brightness ESC Li
Set Gamma Correction ESC Zi
Download Gamma Table ESC zi d0 d1-d255
Set Sharpness ESC Qi
Image Processing Set Digital Halftoning ESC Bi
Set Auto Area
Segmentation ESC si
Download Dither Pattern ESC b I I j d (j2)
Download Color
Correction ESC m d 1 d2-d9
Set Threshold ESC ti
Set Color Correction ESC Mi
Category Command Name Code
Auxiliary Set Scanning Mode ESC gi
Initialize ESC @
Set line Counter ESC di
Control Option ESC ei
Form Feed FF
Set Film Type ESC Ni
Control Normal Response ACK
Abnormal Response NACK
Abort Scanning CAN
Header STX

EPSON GT-7000 Chapter 1 Product Description
Rev. A 10
1.5 Control Specification
1.5.1 Switch Specification
This scanner is equipped with 4 switches. Their functions are described
below.
 OPERATE switch
 Turns the scanner on and off.
 Pressing this switch at power on initializes the scanner.
 PUSH Button
The status of this button can be checked by [EXC!]
 Rotary Switch (for SCSI Model only)
0-7: SCSI ID
Others: Reserved
 Terminator Switch (for SCSI model only)
On: Terminator on (Default)
Off: Terminator Off
1.5.2 LED Indicators
 Ready: Green on
 Busy or Initialization: Slow Blinking
 Error: Fast Blinking
 Operate on: LED off
1.5.3 Switch Setting
Among the switches equipped with this scanner, SCSI switch and the
terminator switch, which are used for SCSI interface, have the following
settings.
 SCSI-ID Setting Switch(Rotary Switch)
Table 1-6. SCSI-ID Setting Switch
 Terminator Switch
Table 1-7. Terminator Switch
Note) Refer to “CHECK POINT” on next page.
ID No. Setting OK/Not Note
0 OK Usually used for host hard disk.
1OK Usually used for host hard disk.
2 OK Factory Setting of the scanner
3OK
4OK
5OK
6OK
7Usually used for SCSI host board.
8,9 No Invalid/ Not available.
CHECK
PO INT
Do not set the SCSI ID to an ID number that is
already assigned to another device. Otherwise
the computer, scanner, and other devices will
not function properly.
Setting Note
ON Connects to the terminal resistor./Factory default
setting.
OFF Disconnects from the terminal register.

EPSON GT-7000 Chapter 1 Product Description
Rev. A 11
1.5.4 Error Indication
When an error occurs, the scanner stops operating and the Operate
light show the type of error.
Table 1-8. Error Indications
CHECK
PO INT
Be aware that the terminator switch must be set
according to the scanner location on the
“daisy-chain”.
Light Error Type
Nothing
Command Error
• Cause: Unidentified command is detected.
• Disposition: The scanner ignores the wrong
command or parameter. (Therefore, the
current settings or the default value remain
effective) Scanner sends NACK, and waits
next command or parameter.
• Remedy: The error condition is cleared when
the scanner received a correct command.
Red LED blinking
(short interval)
Interface Error
• Wrong procedure is detected in the interface
communication. In the case of SCSI, a
transmission is frozen more than 30 seconds
except BUS FREE phase.
• Disposition: The lamp goes off and the
scanner stops operation.
• Turn off the scanner and then back on. RST
signal in SCSI turns active.
• Acceptable command: Nothing
Red LED blinking
Fatal Error
• Cause: The lamp is broken. Power is turned
on before removing the transportation screw.
System break down.
• Disposition: The lamp goes off and the
scanner stops operation. The bit 7 of the
status is set.
• Remedy: Turn the scanner off and then back
on. Send ESC@ codes to the scanner.
RESET signal in SCSI turns active. Complete
BUS DEVICE RESET message in SCSI.
• Acceptable command: [ESC F, ESC f, ESC @]

EPSON GT-7000 Chapter 1 Product Description
Rev. A 12
Table 1-9. Error Indications
Light Error Type
Red + Green LED
blinking
(short interval)
Option Error
(Only when the optional unit is installed and
operation is available by [ESC e].)
• Cause: Unit cover open, or paper Empty
• Disposition: The bit 7 of the status byte is set
to “1”.
• Remedy:Remove the error condition.
• Acceptable command:[ESC F, ESC f, ESC @]

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OPERATINGPRINCIPLES