Epson GT-9000 User manual

MANUAL DE SERVIÇO
SCANNERS
GT9000 / ES-1200C
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Esquemas em Cd-Rom: Monitores, Impressoras,
Televisores, Áudio, Scanners, Etc...

EPSON IMAGE SCANNER
GT-9000 / ES-1200C
SERVICE MANUAL
EPSON

NOTICE
All rights reserved. Reproduction of any part of this manual in any form whatsoever without
SEIKO EPSON’s express written permission is forbidden.
The contents of this manual are subjects to change without notice.
All efforts have been made toensuretheaccuracyof
thecontentsof this manual. However, should
any errors be detected, SEIKO EPSON would greatly appreciate being informed of them.
The above notwithstanding SEIKO EPSON can assume no responsibility for any errors in this
manual or the consequence thereof.
Epson
is registered trademark of Seiko Epson Corporation.
GeneraZ Notice: Other product mmes used herein are for identication purposes only and maybe
trademarks of their respective campanies.
Copyright@ 1994 by SEIKO EPSON CORPORATION Nagano, Japan
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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.
1.
2.
3.
1.
2.
3.
4.
5.
DANGER
ALWAYS DISCONNECT THE PRODUCT FROM BOTH THE POWER SOURCE AND
PERIPHERAL DEVICES PERFORMING ANY MAINTENANCE OR REPAIR PROCE-
DURE.
NO WORK SHOULD BE PERFORMED ON THE UNIT BY PERSONS UNFAMILIAR WITH
BASIC SAFETY MEASURES AS DICTATED FOR ALL ELECTRONICS TECHNICIANS IN
THEIR LINE OF WORK.
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
REPAIRS ON EPSON PRODUCT SHOULD BE PERFORMED ONLY BY AN EPSON
CERTIFIED REPAIR TECHNICIAN.
MAKE CERTAIN THAT THE SOURCE VOLTAGE IS THE SAME AS THE RATED VOLT-
AGE, 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.
ALWAYS VERIFY THAT THE EPSON PRODUCT HAS BEEN DISCONNECTED FROM
THE POWER SOURCE BEFORE REMOVING OR REPLACING PRINTED CIRCUIT
BOARDS AND/OR INDIVIDUAL CHIPS.
IN ORDER TO PROTECT SENSITIVE MICROPROCESSORS AND CIRCUITRY, USE
STATIC DISCHARGE EQUIPMENT, SUCH AS ANTI-STATIC WRIST STRAPS, WHEN
ACCESSING INTERNAL COMPONENTS.
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.
- ii -

PREFACE
This manual describes functions, theory of electrical and mechanical operations, maintenance, and repair
of GT-9000/ES-1200C.
The instructions and procedures included herein are intended for the experience repair technician, and
attention should be given to the precautions on the preceding page. The chapters are organized as
follows:
CHAPTER 1. PRODUCT DESCRIPTION
Provides a general product overview, lists specifications, and illustrates the main components of the scanner.
CHAPTER 2. OPERATING PRINCIPLES
Describes the theory of scanner operation.
CHAPTER 3. DISASSEMBLY AND ASSEMBLY
Includes a step-by-step guide for product disassembly and assembly.
CHAPTER 4. ADJUSTMENTS
Includes a step-by-step guide for adjustment.
CHAPTER 5. TROUBLESHOOTING
Provides Epson-approved techniques for adjustment.
CHAPTER 6. MAINTENANCE
Describes preventive maintenance techniques and lists lubricants required to service the equipment.
APPENDIX
Describes connector pin assignments, circuit diagrams, circuit board component layout and exploded diagram.
The contents of this manual are subject to change without notice.
- iv -

REVISION SHEET
Revision
Issue Date Revision Page
Rev.
A June 29,1994 let issue
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TABLE OF CONTENTS
CHAPTER 1. PRODUCT DESCRIPTION
CHAPTER 2. OPERATING PRINCIPLES
CHAPTER 3. DISASSEMBLY AND ASSEMBLY
CHAPTER 4. ADJUSTMENTS
CHAPTER 5. TROUBLESHOOTING
CHAPTER 6. MAINTENANCE
APPENDIX
- vi -

Chapter 1
Product Description
Table of Contents
1.1 FEATURES
1-1
1.2 SPECIFICATIONS
1-3
1.2.1
1.2.2
1.2.3
1.2.4
1.2.5
1.2.6
1.2.7
1.2.8
Electrical Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Resistance to Electric
Noise . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Environmental Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.
Reliability. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating Conditions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Documents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.
Size of Original for Scanning. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Physical Dimensions and Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.3 INTERFACE SPECIFICATIONS
1-3
1-4
1-4
1-4
1-4
1-4
1-4
1-4
1-5
1.3.1 Bidirectional Parallel Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.3.2 SCSI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.3.2.1 Basic Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.
1.3.2.2 SCSI Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.3.2.3
SCSl status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.3.2.4 SCSI Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.3.2.5 SCSI PinAssignrnents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-5
1-7
1-7
1-8
1-8
1-9
1-9
1.4 BUITONS AND INDICATORS
1-1o
1.5 SELF TEST
1-1o
1.6 ERRORS
1-11
1.7 DATA TRANSMISSION PROTOCOL
1-12
1.7.1 Handshaking Control Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.7.2 Data Block Handshaking Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.7.3 Data Block Formats. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.7.3.1
LineData Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.7.3.2 Block Data Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.7.4 Format of Status Byte . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.8 SCANNER FUNCTIONS
1.8.1
1.8.2
1.8.3
1.8.4
1.8.5
1.8.6
1.8.7
1.8.8
1.8.9
Data Format. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output Resolution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Zoom. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Reading Area. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Color Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Digital Halftoning. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ColorCorrection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Brightness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.
Sharpness. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . “ . “ . “ s
1.8.10 Gamma Correction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.8.11 Scanning Mode.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.
1-12
1-13
1-14
1-15
1-15
1-16
1-17
1-17
1-18
1-18
1-19
1-19
1-20
1-21
1-21
1-21
1-22
1-22

1.9 MAIN COMPONENTS
1-23
1.9.1 B027 MAIN Control Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-24
1.9.2 B027 PSB/PSE Power SupPly Board. . . . . . . . . . . . . . . . . . . . . . . . . . . 1-25
1.9.3
B027 UF Board. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-25
1.9.4 Carriage Assembly (Scanner Head). . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-25
1.9.5 Lower Case with Scanner Mechanism . . . . . . . . . . . . . . . . . . . . . . . . . . 1-26
1.9.6 UpperCase . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-26
Figure 1-1.
Figure 1-2.
Figure 1-3.
Figure 1-4.
Figure 1-5.
Figure 1-6.
Figure 1-7.
Figure 1-8.
Figure 1-9.
Figure 1-10.
Figure 1-11.
Figure 1-12.
Figure 1-13.
Figure 1-14.
Figure 1-15.
Figure 1-16.
Figure 1-17.
Figure 1-18.
Figure 1-19.
Figure 1-20.
Figure 1-21.
Figure 1-22.
Figure 1-23.
Figure 1-24.
Table 1-1.
Table 1-2.
Table 1-3.
Table 1-4.
Table 1-5.
Table 1-6.
Table 1-7.
Table 1-8.
Table 1-9.
List of Figures
External View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . l-l
Maximum SizeofOriginal forscanning . . . . . . . . . . . . . . . . . . . . . 1-4
Data Transmission Timing (Host to Scanner). . . . . . . . . . . . . . . . . 1-5
Data Transmission Timing (Scanner to Host) . . . . . . . . . . . . . . . . . 1-5
Buttons and Indicators Location . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10
Control Codes without Parameters. . . . . . . . . . . . . . . . . . . . . . . . 1-12
Control Codes with Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . 1-12
Scanner Data Request and Monochrome Reading. . . . . . . . . . . . 1-13
Color Reading (Page Sequence Mode) . . . . . . . . . . . . . . . . . . . .
1-13
Color Reading (Line Sequence Mode) . . . . . . . . . . . . . . . . . . . . 1-14
Line Data Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-14
Block Data Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-14
Status Byte. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-16
zoom. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-18
Reading Area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-19
Brightness. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-21
Gamma Correction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-22
GT-900WES-1200C Component Layout . . . . . . . . . . . . . . . . . . . 1-23
B027 MAIN Control Board. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-24
B027 PSB/PSE Power Supply Board. . . . . . . . . . . . . . . . . . . . . 1-25
B027 l/F Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-25
Carriage Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .....1-25
Lower Casewith Scanner Mechanism . . . . . . . . . . . . . . . . . . . . 1-26
Upper Case... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-26
List of Tables
Optional Units. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Pin Assignments for the Bidirectional Parallel Interface. . . . . . . . . . 1-6
Commands for SCSI interface. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-8
Status Bits for SCSI Interface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8
Messages for SCSI Interface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9
Pin Assignments for the SCSI . . . . . . . . . . . . . . . . . . . . . ........1-9
Color Attributes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-16
Scanner Functions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-17
Data Format. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ~ 1-17

GT-900WES-1200C service Manual
Product Description
1.1 FEATURES
The GT-9000 and ES-1200C are low-cost, high-resolution (600 dpi) color image
scanners for A4 or
letter-size sheets. Their main features are:
c1
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L1
L1
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High resolution:
600 dpi
Full-color scanning: 24-bit color
Captures l@bit/pix image and converts to 8-bit
High speed scanning:
Monochrome Approx. 2 msec/line
Color (page) Approx.
16 msec/line
Color (line) Approx.
7 msec/line
Selectable resolution allows use with various printers
Equipped with a Reset button
Resident bidirectional parallel and SCSI interfaces
Resident active terminator for two SCSI 50-pin connectors
Equipped with multi I/F function. (See note 1)
Block data transfer function available
Software command level:
ESC/I - B4+ (See note2)
Compatible with GT-6500/ES-600C and GT-8000/ES-800C
GT-6000/ES-300C emulation (See note3)
Available options: Automatic document feeder
(ADF) and transparency unit
Notes:
1. SCSland bidirectional paral/el interfaces can be connected to two computers
simf.dtaneously, with the fo//owing exceptions:
1. If the scanner receives the “ESC G“command from one //6 itcan’t communicate
with another l/F until it finishes capturing the image.
2. The Reset button maybe unusab/e when a cumputerconnected using the bidirectional/
parallel interface is powered off.
2. The Software label goes up from B4 to
B4+ because of the added “ESC m“ command.
3. The SCSI ID switch
k set to 9, and in this mode, the SCSI ID is 2.
Table 1-1 lists the optional units available. Figure 1-1 shows the scanner’s external appearance.
switch
erminol
Carr
RESE
\
OPERATE button
Figure 1-1. External View
Rev. A
1-1

Plvduct Deedption
GT~S-120@ Smdce
Swn4a/
Table 1-1. Optional Units
Model
Desoriptbn
B813001 Automatic document feeder (for GT-9000)
B813011 Automatic document feeder (for ES-1200C)
B81302*
Transparency unit
B80801*
Bidirectional parallel interface board (for IBM PC)
B880081
SCSI Syatem cable (25-pinto 50-pin)
B880091 SCSI peripheral cable (50-pin to 50-pin)
1380818*
EPSON Scanning Safari for Macintoeh
B80619*
EPSON Scanning Safari for WIndowe
B80820*
EPSON Scan! II for Macintoeh (English)
Mm25*
EPSON Scan! II for WIndowe (Engliah)
The number represented by an asterisk (*) varies by country.
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1-2
Rev. A

GT-900WES-1200C service Manual
Product Description
1.2 SPECIFICATIONS
This section provides specifications for the GT-9000 and ES1200C.
Product type:
Sub-scanning method:
Photoelectric device:
Size of original:
Maximum effective
picture elements:
Scanning resolution:
Output resolutions:
Scanning speeds:
Color separation:
Software level:
Zooming:
Gray scale:
Digital halftoning:
Gamma correction:
Color correction:
Brightness:
Interfaces:
Light source:
Safety regulations:
Power supply:
Options:
Flatbed color image scanner
Reading head movement
CCD (charge coupled device) line sensor
216 x 297 mm (8.5 x 11.7 inches) (A40r letter size)
5096 x 7016 pixels
Main scan: 600 dpi
Sub scan:
600 dpi
2400,1800,1600,1200, 900,800,600,480,400, 360,320,300,240,216, 200,180,
175,160,150,144,133, 120,100,90,80,75,72, 60,50 dpi
Monochrome: Approx.
2 msec/line
Color (page sequence): Approx. 16 rnsec/line
Color (line sequence): Approx. 7rnsec/line
By light source (green, red, blue)
Esc/I-B4+
50YOto2009’0, in 1 !40 steps
8 bits/pixel
3
bi-level modes (A, B, C), 4 dither modes,
2 user-specified modes
2 CRT levels
3 printer levels
1 userdefined level
Impact-dot, thermal, ink-jet printer, CRT display, user defined
7 levels
Bidirectional parallel
SCSI (two 50-pin comectors)
Noble gas fluorescent lights
UL/CSA, ~
100 to 120 VAC, 220 to 240 VAC
Automatic document feeder
Transparency unit
1.2.1 Electrical Specifications
Rated voltage:
100 to 120 VAC
220 to 240 VAC
Input voltage: 90 to 132 VAC (100 -120 V)
198 to 264
VAC (220 -240 V)
Rated current:
0.8 A (100 -120 V)
0.4 A (220 -240 V)
Rated frequency range: 50 to 60Hz
Input frequency range: 49.5 to 60.5 Hz
Power consumption:
Approx. 45 W (self-test in monochrome mode)
Insulation resistance: 10
Mf2, minimum (500 VDC between AC line and chassis)
Dielectric strength:
1200 VAC, 1 min (100 -120 V)
1500
VAC, 1 rnin (220 -240 V)
(between AC power line and chassis)
RFI noise: FCC 15B class B (USA)
CSA 108.8 class B (CANADA)
~ (EUROPE)
Rev. A
1-3

Pfvduct Descri@ion
GT4iU)tlES-12&E Servh Mm@
1.2.2 Resistance to Electric Noise
Static electricity:
Panel -10 KV
Metal -7 KV, 150 pF, 150
Cl
1.2.3 Environmental Conditions
Temperature Operating: 5 to35degrees C(41 to95degrees F)
Storage:
-25 to 60 degrees C (-13 to 140 degrees F)
Humidity
Operating: 10t080%, nocondensation
Storage: 10to857., no condensation
1.2.4 Reliability
Main unit:
MCBF IOO@OO cycles
1.2.5 Operating Conditions
Dust:
Ordinary office or home conditions
Avoid placing in an extremely dusty environment.
Illumination:
Avoid operation under direct sunlight or near a strong light source.
1.2.6 Documents
Refractive type: Documents with smooth surfaces, such as printing and photographs
1.2.7 Size of Original for Scanning
Dimensions:
216 mm (8.64 inches) horizontal x 297mm (11.88 inches) vertical
216 mm (8.64 inches)
4
*
A
,..
origin
297 mm
(11.88 inches)
. .
Figure 1-2. Maximum Size of Original for Scanning
1.2.8 Physical Dimensions and Weight
Dimensions (Wx Dx H): 383mmx 595mmx 1695 mm(15.C8 x 23.43 x 6.67inches)
Weight:
l@MOX. 12 kg (26.5 lb.)
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GT-900WES-1200C sewice Manual
Product Description
1.3 INTERFACE SPECIFICATIONS
The GT-90Ml and ES-12(M3C are equipped with the following external interfaces:
■ Bidirectional parallel interface
9 SCSI (Small Computer System Interface)
1.3.1 Bidirectional
Interface type:
Data format:
Synchronization:
Handshaking:
Logic level:
Connector type:
Data transrni~sion timing:
Pin assignments:
Parallel Interface
Bidirectional parallel interface
8-bit parallel
By STROBE pulse
By BUSY/ACKNLG pulse
Input/output data and interface control signals are TT’L-level compatible.
36-pin 57-30360 (Amphenol) or equivalent
See Figures 1-3 and 1-4.
See Table 1-3.
STROBE
BUSY
ACK
DATA
DIR
0.5 pa, typical
1
~ 0.5 p, minimum
J!
,—:
0.5 pa, minimum
4
IN
Figure 1-3. Data Transmission Timing (Host to Scanner)
STROBE /
BUSY
~
ACK
DATA
DIR
OUT 4\
IN
Figure 1-4. Data Transmission Timing (Scanner to Host)
Rev. A
1-5

Prvduct Lkscrlption
Table 1-2. Pin Assignments for the Bidlrectionai Paraiiel Interface
Pin No. Signal Name
m Description
1 STROBE
I
The STROBE pulse used to read in or send out data. Pulse
width at the receiving terminal must exceed 0.5 p.s.
2-9 DATAO-7
I/o These signals convey the Ist to 8th bits of data.
A HIGH
level indicates a logical 1; a LOW level indicates a logical O.
A pulse of approx. 12 W. A LOW level indicates that data
10 ACKNLG o
has been received and the scanner is ready to accept mom
data.
When this signal is HIGH, the scanner cannot receive data.
The signal beoomes HIGH:
11 BUSY o
1 during data entry
2.during scanning
3.when the scanner is not ready
4.when the scanner has an error
12-15 NC
—
Not used
16 GND
—
Logic ground level
17 C-GND . Scanner chassis ground
18 NC .Not used
19-30 GND —
Twisted-pair return signal ground level
When this signal level becomes LOW, the scanner is reset
31 m
I
to its power on state. This level is usually HIGH. The pulse
width at the receiving terminal must be greater than 50 ~.
32 NC
—
Not used
33
GND
—
Twisted-pair return signal ground level
34-35 NC
.
Not used
36 DIR
I
A LOW indicates that the direction is input.
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1-s
Rev. A

GT-900WES-1200C service Manual
Product Description
1.3.2 SCSI
This section describes the SCSI interface for the GT-9000/ES-1200C.
1.3.2.1 Basic Specifications
Any items not included in this service manual are in
conformance with ANSI standard
X3.131-1986.
Interface type:
ANSI X3.131-1986
Functions: The following functions are included
1. Bus-free phase
2. Arbitration phase
3. Selection/reselection phase
4. co remand phase
Note: The LUN (Logical Unit Number) is fixed to O
in this device.
The Command Link Function is not suppotted.
5. Data phase
Data in phase
Data out phase
6. Status phase
7. Message phase
Message in phase
Message out phase
8. Attention condition
9. Reset condition
Logic level: TTL-compatible
Electrical standard: ANSI standard X3.131-1986.
Terminator: Internal terminator turned on or off by the switch
ID settings:
The SCSI ID is set with a rotary switch on the rear panel. The switch
numbers correspond to the available addresses and can be set from
O to 7. Number 8 is for GT-60041 (ES-300C) emulation mode (used for
self-test), and number 9 is reserved.
Connector type:
Two 50-pin comectors
Rev. A
1-7

Ptvduct Description GT-4XW(M3-12iUK
-e Manuel
1.3.2.2 SCSI Commands
This device uses the following group “O” p
roms.sor commands:
Table 1-3. Commands for SCSI Interface
Command Code
Description
Test Unit Ready Confirm for operation
Request Sense Requires sense data (Note 1)
Receive
Data transmission from target to initiator
Send OAH
I Data transmission from initiator to target
Inquiry 12H I Requires information of SCSI device (Note 2)
Notes: 1. Onlyfhe extenwon sense okta fonnatis su#xxtedf orsense data returned by the
sense request command.
Inquity data is as fallows:
Peripheral device type: 03H(processorj
RMB:
WH (non-removable media)
Device type restriction: #H
ISO version:
ECMA version:
ANSI ve~ion:
OIH (current version)
Additional length:
23H
Vendor-unique
parameter bytes:
[oOH, OOH, OOH, ‘EPSON, ’20H, ‘SCANNER, ’20H,
‘GT-xxxx**””, ‘ OOH, OOH, OOH, FFH]
GT-XXXX: product name
● *** .
ROM version
1.3.2.3 SCSI Status
Table 14. Status Bits for SCSI Interface
status Bits
status
765 4 3
2 1 0
R R
o 0 0
0 0 R
Check Condition R R o
0 0 0
1 R
Busy R R o
0 1
0 0 R
@
,,., .,.
,,,.
All other codes are reserved.
‘R’ means reserved bit.
4!9
1*
Rev. A

GT-90MVES-1200C service Manual
Product Description
1.3.2.4 SCSI Messsges
Table 1-5. Messages for SCSI Interface
Message Code Direction
Completion of ATN
Command Complete
OOH
In
—
Disconnect
I
04H
I
In
I
—
I
Bus Device Reset 06H out Yes
Message Reject 07H In/out Yes
Identifv
I
80H-FFH
I
In/out
I
No
I
1.3.2.5 SCSI Pin Assignments
Table 1-6. Pin Assignments for the SCSI
Pin No. Signal Name I/o Description
1-12, 14-25,
35-37,39,40,42
GND — Signal ground
13
NC —Not USd
26-33 DBO-7 1/0 Data bus O-7
34 DBP
1/0 Data bus pariiy
38
TERMPWR —
Termination power (+5 V)
41
ATN I Attention
43 BSY
1/0 Busy
44
ACK
I
Acknowledge
45 RST
I Reset
46 MSG
o Message
47
SEL
1/0
Select
48 CID
o
Control/Data
49
REQ o
Request
50
1/0 o input/Output
Rev. A
1-9

Ptvduct Description
GT~S-1~ ~Mmx4s/
1.4 BUITONS AND INDICATORS
This scanner has two push buttons and three LED indi~tors for easy operation.
Butions
OPERATE
Turns the seamer on and off. When power is turned cm, the scanner
is reset.
RESET
Initializes the
scanner. Every value is reset to the default value.
Indicators
OPERATE (green LED) Comes on when power is turned on.
READY (green LED) Comes on when the scanner is ready to receive data.
ERROR (red LED) Indicates that an error has occurred.
ERROR READY
OPERATE
light
Ilght light
I
6-,
\
\ 1]
d
#
#
k ❑ ❑ P
EPSON
6
)
I
I 1
[e e 0[
‘ RESET OPERATE
button button
Figure 1-5. Buttons and Indicators Location
1.5 SELF-TEST
This scanner has a built-in self-test mode to check the functions of the following parts.
■ Noble-gas fluoresce t lamp
■ Sensor mechanism
Procedure for coforp8~ sequence m-
1. Set the SCSI ID switch on the back of the scanner to 8.
2. Turn the scanner on while pressing the RESET button, and hold down the RESt3 button
until the ERROR and OPERATE LEDs light. (It takes approximately 10 seconds.)
3. The
scanner starts the color page sequence scanning operation when the
RESET buttcm is
released.
4. After confirming the operation of the scanner, you can termina
te the self-test either by pressing
the RESET button or turning off the smnner.
@
C3
.,
.,
1. Set {he SCSI ID switch on the backof the scanner to 8.
2. Turn the
scanner on while pressing the RESET button, and hold down the RESET button
until all LEDs are lit. (It takes approximately 15 semnds.)
3. The
scanner starts the monochronw page sequence
scanning operation when the RESET
switch is released.
4. After confirming the operation of the scanner, you can termina te the self-test either by pressing
the RESET button or turning off the scanner.
4!3
1-1o Rev. A

GT-900WES-1200C service Manual
Product Description
1.6 ERRORS
When an error occurs, the scanner displays the corresponding error message using the LEDs.
Command Errors
Cause:
Disposition:
Indications:
Remedy:
Intetiace Errors
Cause:
Disposition:
Indications:
Remedy:
Acceptable commands:
Fatal Errors
Cause:
Disposition:
Indications:
Remedy:
Acceptable commands:
An unidentified comman d is detected.
The scanner ignores the cornman d or parameter. (The current
settings or the default values remain in effect.)
The scanner sends a NACK and waits for the next comman
d or
parameter.
READY LED comes ON
ERROR LED comes ON
The error condition is cleared when the scanner receives a correct
command.
A wrong procedure is detected during interface communications.
With a SCSI interface, a transition is frozen more than 30 seconds,
except in the BUS FREE phase.
The lamp goes OFF and the scanner stops operating.
READY LED goes OFF
ERROR LED blinks
Turn the scanner off and then back on.
Press the RESET button.
The INIT signal in the parallel interface turns active.
The RESET signal in the
SCSI interface turns active.
Complete BUS DEVICE RESET message in SCSI.
None
The lamp is broken.
Power was turned on and the transportation screwhas not been
removed.
System breakdown.
An error related to an option is detected, such as cover open, paper
“arnmin& etc.
J
The lamp goes off and the scanner stops operating.
Bit 7 of the status byte is set.
READY LED blinks.
ERROR LED blinks.
Turn the scanner off and then back on.
Press the RESET button.
Send ESC @ codes to the scanner.
The INIT signal in the parallel interface turns active.
The RESET signal in the SCSI interface turns active.
Complete BUS DEVICE RESET message in SCSI.
ESC F, ESC f, ESC @
Option Error (Available only when an option is installed and enabled with ESC e)
Cause: An error related to the option is detected, such as cover-open, paper
empty, etc.
Disposition:
Bit 7 of the status byte is set.
The responding bit is set in the extended status data.
Indications:
READY LED goes OFF.
ERROR LED goes OFF.
Remedy: This error is cleared when the cause of the error is removed.
Rev. A
1-11