Epson B81306 series User manual

TRANSPARENCY UNIT
B81306*
FOR EPSON IMAGE SCANNER
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.
Alleffortshavebeen 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.
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.
General Notice: Otherproductnames used herein are foridentication 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 perfo
rming 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 performin
g repair/
maintenance procedures.
1.
2.
3.
1.
2.
3.
4.
5.
DANGER
ALWAYS DISCONNECT THE PRODUCT FROM BOTH THE POWER SOURCE AND
PEIUPHERALDEVICES PERFORMING ANY
MAINTENANCE OR REPAIR PROCEDURE.
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 E
XTREME CAUTION IN
WORKING ON POWER SUPPLY AND OTHER ELECTRONIC COMPONENTS.
WARNING
REPAIRS ON EPSON PRODUCT SHOULD BE PERFORMED ONLY BY AN EPSON CER-
mD REPAIR TECHNICIAN.
MAKE CERTAIN THAT THE SOURCE VOLTAGE IS THE SAME AS THE RATED VOLT-
AGE, LISTED ON
T’HE SERIAL NUMBER/RATING PLATE. IF THE EPSON PRODUCT
HAS A P
RIMARY 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 ICSOROTHER NONAP-
PROVED COMPONENTS
MAY DAMAGE THE PRODUCT AND VOID ANY APPLICA-
BLE EPSON WARRANTY.
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PREFACE
This manual describes functions, theory of electrical and mechanical operations, maintenance, and repair
of B813061/B813062 Transparency Unit.
The instructions and procedures included herein are intended for the experience repair technician, and
attention should be given totheprecautions ontheprecedingpage. The chapters areorganized as follows:
CHAPTER 1. PRODUCT DESCRIPTION
Provides a general product overview, lists specifications, and illustrates the main components of the printer.
CHAPTER 2. OPERATING PRINCIPLES
Describes the theory of transparency unit operation.
CHAPTER 3. DISASSEMBLY AND ASSEMBLY
Includes a step-by-step guide for product disassembly and assembly.
CHAPTER 4. ADJUSTMENTS
This transparency unit is not needed any adjustment.
CHAPTER 5. TROUBLESHOOTING
Provides Epson-approved techniques for service.
CHAPTER 6. MAINTENANCE
Describes preventive maintenance techniques and lists lubricants and adhesives 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.
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REVISION SHEET
b
Revision Issue Date Revision Page
Rev.
A
November 28,1994 Ist 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
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CHAPTER 1
Product Description
Table of Contents
1.1 FEATURES
1-1
1.2 SPECIFICATIONS
1-1
1.3 MAIN COMPONENTS
1-1
Figure 1-1.
List of Figures
Exterior View of the Transparency. . . . . . . . . . . . . . . . . . . . . .. ....1-1

B81306* Service Manual Product Description
1.1 FEATURES
This transparency unit is a high-quality device developed to enable EPSON Scanner owners to scan
wide
size(up to A4 or Letter size) transparency, slides and films in color or monochrome.
Figure 1-1. Exterior View of the transparency unit
1.2 SPECIFICATIONS
SC
arming method
Color separation
Sub-scanning resolution
Light Source
D
ocument type
SC arming size
Environment conditions
Power consumption
Reliability
Dimensions
: Light source movement
: By light Source (green,red,blue)
: Max.800PDI
: Noble gas cold cathord-ray tube
: Transparency documents (including slide film) in color or
monochrome
: Up to 216mm X 297mm (8.5” X 11.7”)
Temperature Operating 5 to 35 degrees C(41 to95 degrees F)
Storage
-20 to 60 degrees C(-4 to 140 degrees F)
Humidity Operating 10t080%nocondensation
Storage
10 to 85 !4.
: +24V
Max.500mA
: +5V Max.100mA
: MCBF 100,000 cycles
: 324mm X 540mm
x84mm
1.3 MAIN COMPONENTS
The main components are;
Q Mechanism Unit
D BOARD ASSY., MAIN: Control board
D Invertor Circuit
D Housing
Rev.A
1-1

CHAPTER 2 Operating Principles
Table of Contents
2.1 TRANSPARENCY MECHANISM OPERATION
2-1
2.1.1 Carriage Movement Mechanism. . . . . . . . . . . . . . . . . . . . . . . . .........2-1
2.2 CONTROL CIRCUIT 2-2
2.2.1 Circuit Operation Overview. . . . . . . . . . . . . . . . . . . . . . ...............2-2
List of Figures
Figure 2-1. The Carriage Movement Mechanism. . . . . . . . . . . . . . . . . . . . . .. ..2-1
Figure 2-2. Circuit Block Diagram . . . . . . . . . . . . . . . . . . . . . ...............2-2

B81306* SeMce
“ Manual
Operating Principle
2.1 TRANSPARENCY MECHANISM OPERATION
This section describe the transparency mechanism and explains it works.
2.1.1 Carriage Movement Mechanism
The transp
arency method is the carriage of light source movement method. The carriage
movement mechanism consists of lamp carriage assembly, carriage motor assembly, gear/lead
screw, roller and carnage home position sensor. Figure 2-1 shows the carriage movement
mechanism.
The carriage motor assembly drives the gear/lead screw. The mrriagemot or=sembly~ mounted
on the lamp carriage assembly. The lead screw is
connected to the housing. When the carriage
motor turns the gear, the carriage move the forward or backward in the housing smoothly via lead
screw. The
carriage movement synchronizes with the scanner head movement.
The carriage home position
sensor informs the CPU of scanner the carriage home position. The
sensor is photo-coupler type. The striker on the carriage active the sensor to indicate the carriage
home position.
Carriage Home Position Sensor
I
Combination Gear
(J
-.,
Carriage
‘Roller
Figure 2-1. The Carriage Movement Mechanism
Assembly
Rev.A
2-1