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.
-ii-

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.
-iv-

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
-vi-

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

Operating Principle B81308* Service Manual
2.2 CONTROL CIRCUIT
This section describes the main components and explains how the board work.
2.2.1 Circuit Operation Overview
The control circuit consists of the main control circuit board and the invertor circuit board. The
main circuit board drives
the carriage motor. ‘Ihe invertor drives the light source of 3 colors
(green,red,blue) noble gascathord-ray tube only. Thiscircuitis needed +5VDC(forlogic) and
+24VDC(for Jnvertor and carriage motor). These power are supplied by the scanner via connector
CN1.
. . . . . . . . . . . . . . . . . . . . . . .
I
(
BOARD ASSY.,MAIN
Home Position Sensor
Cover Open Sensor
. . . . . . . . . . . . . . . . . . . . . . . .
I
1
Figure 2-2. Circuit Block Diagram
2-2
Rev.A

CHAPTER 3 Disassembly and Assembly
Table of Contents
3.1 OVERVIEW
3-1
3.1.1 Disassembly Precautions. . . . . . . . . . . . . . . . . . . . . . . . ..............3-1
3.1.2
ToOIS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............3-1
3.1.3 Service ChecksAfterRepair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...3-2
3.1.4 Specificationsfor Screws. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. ...3-2
3.2 DISASSEMBLY AND ASSEMBLY
3-3
3.2.1
3.2.2
3.2.3
3.2.4
Removing the HOUSING, LOWER. . . . . . . . . . . . . . . . . . . . . . .........3-4
Removing the CARRIAGE
ASSY. . . . . . . . . . . . . . . . . . . . . . ..........3-5
Removing the BOARD
ASSY.,MAIN . . . . . . . . . . . . . . . . . . . . . ........3-6
Disassembly CARRIAGE
ASSY. . . . . . . . . . . . . . . . . . . . . . ...........3-7
3.2.4.1 Removing the CARRIAGE MOTOR . . . . . . . . . . . . . . . . . . . . .. .3-7
3.2.4.2 Removing the BOARD ASSY.,INVERTOR . . . . ..............3-8
3.2.4.3 Removing the COMBINATION GEAR,22.6,69.3. . ............3-9
List of Figures
Figure 3-1. Procedure for Disassembling the Printer. . . . . . . . . . . . . . . . . . . . . .3-3
Figure 3-2. Removing the HOUSING, LOWER. . . . . . . . . . . . . . . . . . . . . .. ....3-4
Figure 3-3. Removing the CARRIAGE
ASSY. . . . . . . . . . . . . . . . . . . . . . .. ....3-5
Figure 3-4. Putting CABLE,CR on the
FRAME,COVER . ..................3-5
Figure 3-5. Removing the BOARD ASSY.,MAIN. . . . . . . . . . . . . . . . . . . . . .. ..3-6
Figure 3-6. Removing the CARRIAGE MOTOR . . . . . . . . . . . . . . . . . . . . .. ...3-7
Figure 3-7. Assembling the CARRIAGE MOTOR . . . . . . . . . . . . . . . . . . . . .. ..3-7
Figure 3-8. Removing the BOARD ASSY.,INVERTOR . . . . . . . . . . . . . . . . . . . . 3-8
Figure 3-9. Removing the COMBINATION GEAR,22.6,69.3. . ..............3-9
List of Tables
Table 3-1. Recommended Tools . . . . . . . . . . . . . . . . . . . . . ................3-1
Table 3-2. Equipment Required for Maintenance . . . . . . . . . . . . . . . . . . . . .. ..3-1
Table 3-3. Inspection Check list for Repaired Printer. . . . . . . . . . . . . . . . . . . . . .3-2
Table 3-4. Screw Abbreviations. . . . . . . . . . . . . . . . . . . . . . . ...............3-2

U1306* Service Manual
Disassembly and Assembly
=1 OVERVIEW
This section describes various points to note when disassembling and assembling the transparency
unit.
3.1.1 Disassembly Precautions
Follow the precautions below when disassembling the transparency unit.
CJ2
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.-+
(-)
Before dkassem
bling or assembling the transparency unit, discomect the power supply
cable of scanner from the AC power socket and remove it from scanner. Failure to do can
cause personal injury.
To maintain efficient transparency unit. operatiom
. Use only the recommended tools for maintenance
e work.
. Use only the recommended lubricants and adhesives (see Chapter 6).
3.1.2 TOOIS
Tables 3-1 and 3-2 list the tools recommended for &assemb
Iing, assembling or adjusting the
transparency unit. Use only tools that meet these specifications.
Note:
Note:
Table 3-1. Recommended Tools
Tool Part No.
Round-nose pliers
B740400100
Nicmers B7405OO1OO
Tweezem
B741OOO1OO
Soldering iron
B7402OO1OO
Phillips screwdriver No.2 B743800200
Normal screwdriver
B743OOO1OO
All tools are commercially available.
Table 3-2. Equipment Required for Maintenance
Description
I
Specification
Multimeter
—
I
Oscilloscme
I
50 MHz
An oscilloscope is required only
for sewicers who repair to the component level.
Rev.A
3-1

Disassemble and Assemblv
B81308* Service Manual
3.1.3 Service Checks After Repair
Before returning the transparency unit after service, use the checklist in Table 3-3, which provides a
record to make
~ervicing &d shipping more efficient.
Table 3-3. Inspection Check list for Repaired Printer
Component
Item to Check Is Check Required?
Does the carriage move smoothly?
❑ Movement noisy ❑ Mechanism
dirty
❑ Checked ❑ Not necessary
Carriage
mechanism
❑ Mechanism oily
Is the CARRIAGE MOTOR at the
❑ Checked ❑ Not necessary
correct temperature (not overheating)
Glass Side Is the surface of the Glass stain?
❑ Checked ❑ Not necessaty
On-1ine test
Was the on-line test successful?
❑ Checked ❑ Not necessay
3.1.4 Specifications for Screws
Table 3-4 lists the abbreviations used in the following sections for small parts, such as screws and
washers.
Table 3-4. Screw Abbreviations
T
Abbreviation Part
Name
CBB Cross-recessed bind head B-tight screw
I
CBS
I Cross-recessed bind head S-tight screw
I
3-2
Rev.A

Diaaasembly and Assembty
3.2 DISASSEMBLY AND ASSEMBLY
This section describes the procedures for disassembling and assembling the main components of
the transparency unit. When the procedure for installing a component is simply the reverse of the
procedure for removing the component, no description of the installation is given. Any pornts of
special concern follow the description of the procedure.
c1
4.
‘,: . . .
c)
. . .
. Before dkssemb
Iing any part of the transparency unit, note the wamin gs in Section 3.1.
. Before dkssemb Iing any part of the transparency unit, remove the paper.
Disassembly includes the fo~ovving 4 procedures:
1. Rernovingthe HOUSING,LOWER
2 Removing the
CARRIAGE ASSY
3. Removing the BOARD ASSY.J4AIN
4. Dkssemb kg the
CARRIAGE ASSY.
Refer to the diagrams in the appendix to see how components fit together.
3.21
RerIKJving TRAY COVEll
J
I
Removina CAStNH SUS-ASSY.
Ii%’g$v’+
liiii&SY.,MNN] l-%?%%%,
3.25
Removing
+’-” --
32-6 3.213 3.214 3215
Refnc4ingoPncAL
Rmov@JPOWER lwnovhglNvERTER
FRAME SUS-ASSY. SOCIWTASSY.
Figure 3-1. Procedure for Disassembling the Unit
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Rev.A 3-3

Disassembly and Assembly B81306* Service Manual
3.2.1 Removing the HOUSING, LOWER
1.
Remove the 4 CBB (M4x 10) screws and 2 CBS (M3 x 8) attaching the HOUSING,LOWER to
HOUSING,UPPER.
2. Remove the HOUSING,LOWER.
CBB(M4X1O)
CBB(M4X1O)
A
CBS(M3X8)
Figure 3-2. Removing the HOUSING, LOWER
3-4
Rev.A

B61306* Service Manual D&asemMy
and Assembly
Q
.“. ’.7.
3.2.2 Removing the CARRIAGE ASSY.
1. Removing the HOUSING,LOWER. (see Section 3.21)
2. Remove the CABLE,CR attaching to the FRAME COVER of
HOUSING,UPPER
3. Remove the 2 CBB (M4 x 12) screws attaching the HOLDEF&UW1’ FRONT and REAR of the
CARRIAGE ASSY. to the HOUSING,UPPER
4. Liftoff the CARRIAGE ASSY. with HOLDEW-IAFT FRONT and REAR
,CBB(M4X12)
Adhesive Tapes
Figure 3-3. Removing the CARRIAGE ASSY.
1. The CABLE,CR must be put on the FRAME
COVER straightly from the connector (CN4).
(see fig3-4.)
2. The CABLE,CR must not be gotten tight while
CARRIAGE ASSY. moving from front to
rear.
CN4
FRAME, COVER
/
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I
CABLE,CR
Figure 3-4. Putting CABLE,CR on the FRAME, COVER
Rev.A 3-5

Disassembly and Assembly
B81308* Service Manual
3.2.3 Removing the BOARD ASSY.,MAIN
1. Removing the HOUSING,LOWER. (see Section 3.2.1)
2. Removing the CARRIAGE ASSY. (see Section 3.2.2)
3. Remove the4CBB (M4 x 12) screws attaching the HOLDER ASSY. to HOUSING,UPPER. And
remove the HOLDER
ASSY.
4. Remove the CBB (M3 x 8) and 8 CBB (M4 x 10) screws attaching the FRAME,COVER to
HOUSING,UPPER. And remove the FRAME,COVER.
5. Disconnect theconnectOrs CNl,CN2 and CN3fromthe BOARD ASSY.,MAIN.
6. Remove the 2 CBB (M3 x 10) screws attaching the BOARD ASSY.,MA~ to HOUSING,UPPER.
And remove the BOARD ASSY.JVIAIN.
CBB(M4X1O)
II’”+?
CBB(M4X1O)
YA
FRAME, COVER
CBS(M3X8)
BS(M3X8)
HOLDER AssY.
“w-m a- r .-”
/ ‘ RnARIT AQ!2y.,vlAIN
Figure 3-5. Removing the BOARD ASSY.,MAIN

BS1306* Sarvice Manual
Disaaaembly and Assembly
.
3.2.4 Disassembly the CARRIAGE ASSY.
3.2.4.1 Removing the CARRIAGE MOTOR
1.
2.
3.
4.
,.-.
(j’
Removing the HOUSING,LOWER. (see Section 3.2.1)
Removing the
CARRIAGE ASSY. (see Section 3.2.2)
Release the wire harness of the CARRJAGE MOTOR from the hook of the
FRAME ASSY.,BASE.
Remove the 2 CBS (IU3 x 6) screws attaching the
C.ARRL4GE MOTOR to FMME ASSY.,BASE.
And remove the MOTOR.
/T-)
?’
I \
Wire Harness
/
CARRIAG
\ FRAME ASSY.,BASE
Figure 3-6. Removing the CARRIAGE MOTOR
Rotate the MOTOR clockwise
until the stopper on the FRAME
ASSY.,BASE and tight Up
screws.
Figure 3-7.Assemoving the CARRIAGE MOTOR
Rev.A 3-7

Disassembly and Assembly
B61306* Service Manual
3.2.4.2 Removing the BOARD ASSY.,INVERTOR
1.
Remove the CARRIAGE ASSY. (see %&on 3.2.2)
2. Removing the 2 CBS (M3 x6) screws attaching the COVER,CRto FR4ME ASSY.,BASE and
remove COVER,CR.
3. Disconnect the comector of LAMP ASSY. from the BOARD ASSY.,INVERTOR and remove
LAMP
ASSY.
4. Disconnect the comectorof CARRIAGE MOTOR from the BOARD ASSY.,INVERTOR and
remove it.
5. Removing the 2 CBS (M3 x 6) screws attaching the BOARD ASSY.,INVERTOR to the FRAME
ASSY.,BASE and remove BOARD ASSY.,INVERTOR.
COVER,CR
/
I
CBS(M3X6)
I
\
1
LAMP ASSY.
I
‘ie=7\l i
.
,FRAME ASSY.,BASE
I./
ASSY.,INVERTOR
Figure 3-8. Removing the BOARD ASSY.,INVERTOR