Epson 4490 Service manual
Service Manual
Color Image Scanner
EPSON Perfection 4490 Photo
Automatic Document Feeder
SESC05004
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, or
otherwise, without the prior written permission of SEIKO EPSON CORPORATION.
All
The contents of
The ab
EPSON is a registered trademark of SEIKO EPSON CORPORATION.
General Notice:Other product names used herein are for identification pu
Copyright © 2005 SEIKO EPSON CORPORATION.
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.
this manual are subject to change without notice.
ove not withstanding SEIKO EPSON CORPORATION can assume no responsibility for any errors in this manual or the consequences thereof.
tive owners. EPSON disclaims any and all rights in those marks.
I&I CS/Quality Management & PL Department
rpose only and may be trademarks or registered trademarks of their respec-
PRECAUTIONS
Precautionary notations throughout the text are categorized relative to 1) Personal injury and 2) damage to equipment.
DANGER Signals
WARNING Signals a precau
The precautionary measures itemized below s
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.
tion which, if ignored, could result in damage to equipment.
hould 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. NO WORK SHOULD BE PERFORMED ON THE UNIT BY PERSONS
THEIR LINE OF WORK.
3. WHEN PERFORMING TESTING AS DICTATED WITHIN THIS MANUAL, DO NOT CONNECT THE
POWER SUPPLY CABLE MUST BE CONNECTED, USE EXTREME CAUTION IN WORKING ON POWER SUPPLY AND OTHER ELECTRONIC COMPONENTS.
4. WHEN DISASSEMBLING OR ASSEMBLING A PRODUCT, MAKE
UNFAMILIAR WITH BASIC SAFETY MEASURES AS DICTATED FOR ALL ELECTRONICS TECHNICIANS IN
UNIT TO A POWER SOURCE UNTIL INSTRUCTED TO DO SO. WHEN THE
SURE TO WEAR GLOVES TO AVOID INJURIER FROM METAL PARTS WITH SHARP EDGES.
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
HAS A PRIMARY AC RATING DIFFERENT FROM AVAILABLE POWER SOURCE, DO NOT CONNECT IT TO THE POWER SOURCE.
AS THE RATED VOLTAGE, LISTED ON THE SERIAL NUMBER/RATING PLATE. IF THE EPSON PRODUCT
3. ALWAYS VERIFY THAT THE EPSON PRODUCT HAS BEEN
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. DO NOT REPLACE IMPERFECTLY FUNCTIONING COMPONEN
COMPONENTS WHICH HAVE NOT BEEN APPROVED ARE USED, THEY COULD CAUSE DAMAGE TO THE EPSON PRODUCT, OR COULD VOID THE WARRANTY OFFERED
BY EPSON.
DISCONNECTED FROM THE POWER SOURCE BEFORE REMOVING OR REPLACING PRINTED CIRCUIT BOARDS
TS WITH COMPONENTS WHICH ARE NOT MANUFACTURED BY EPSON. IF SECOND SOURCE IC OR OTHER
About This Manual
This manual describes basic functions, theory of electrical and mechanical operations, maintenance and repair procedures of the printer. 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.
Manual Configuration
This manual consists of four chapters and Appendix.
CHAPTER 1.PRODUCT DESCRIPTION
Describes the features and basic specifications of the product.
CHAPTER 2.OPERATING PRINCIPLES
Describes the electrical and mechanical basic operating principles of the
product.
CHAPTER 3.TROUBLESHOOTING
Describes the step-by-step procedures for the troubleshooting.
CHAPTER 4.DISASSEMBLY/ASSEMBLY
Describes the step-by-step procedures for disassembling and assembling
the product.
CHAPTER 5.ADJUSTMENT
Provides Epson-approved methods for adjustment.
CHAPTER 6.MAINTENANC E
Provides preventive maintenance procedures and the lists of Epsonapproved lubricants and adhesives required for servicing the product.
APPENDIX Provides the following additional information for reference:
• Connector pin assignments
• Electric circuit boards components layout
• Electrical circuit boards schematics
• Exploded diagram
•Parts List
• Optional part: ADF
Symbols Used in this Manual
Various symbols are used throughout this manual either to provide additional
information on a specific topic or to warn of possible danger present during a
procedure or an action. Be aware of all symbols when they are used, and always read
NOTE, CAUTION, or WARNING messages.
A D J U S T M E N T
R E Q U I R E D
C A U T I O N
C H E C K
P O I N T
W A R N I N G
Indicates an operating or maint
condition that is necessary to keep the product’s quality.
Indicates an operating or maintenance procedure, practice, or
con
dition that, if not strictly observed, could result in damage to, or
destruction of, equipment.
May indicate an operating or maint
condition that is necessary to accomplish a task efficiently. It may
also provide additional information that is related to a specific
subject, or comment on the results achieved through a previous
action.
Indicates an operating or maint
condition that, if not strictly observed, could result in injury or loss
of life.
enance procedure, practice or
enance procedure, practice or
enance procedure, practice or
Indicates a product reassembly procedure, practice or condition
must be executed in accordance with the specified standards to keep
the product's quality.
that
Revision Status
Revision Date of Issue Description
A May 31, 2005 First release
EPSON Perfection 4490 Photo Revision A
Contents
Chapter 1 PRODUCT DESCRIPTION
1.1 Features.................................................................................................................. 9
1.2 Specifications ...................................................................................................... 10
1.3 Detailed Specifications........................................................................................ 12
1.4 Interface............................................................................................................... 12
1.5 Exterior Specifications ........................................................................................ 13
1.5.1 Explanation of Switches............................................................................. 13
1.5.2 Explanation of LED Indicators........................................... ........................ 13
1.5.3 Dimensions................................................................................................. 14
1.5.4 Maximum Document Size and Placement..................................................
1.6 Control Codes............................................... ................................................ ....... 16
1.7 Error-Time Processing......................................................................................... 17
15
Chapter 2 OPERATING PRINCIPLES
2.1 Engine Operation Outline.................................................................................... 19
2.1.1 Carriage Unit outline .................................................................................. 19
2.1.2 TPU Carriage Unit Outline......................................................................... 20
2.1.3 Carriage Moving Mechanism Operation .................................................... 21
2.1.4 TPU Carriage Drive Mechanism Operation............................................... 22
2.2 Digital ICE Function Operation .......................................................................... 23
2.2.1 Digital ICE for Film Overview................................................................... 23
2.3 Operation Principle of Electric Circuit................................................................ 24
Chapter 3 TROUBLESHOOTING
3.1 Overview ............................................................................................................. 26
3.1.1 Self-Diagnosing.......................................................................................... 26
3.2 Troubleshooting................................................................................................... 27
Chapter 4 Disassembly / Assembly
4.1 Overview................................................................................... .......................... 30
4.1.1 Precautions..................................................................................................
4.1.2 Recommended Tools.................................................................................. 30
4.1.3 Recommended Screws................................................................................ 30
4.2 Disassembly Procedure ....................................................................................... 31
4.2.1 Removing the TPU Unit............................................................................. 32
4.2.2 Removing the Upper Housing.................................................................... 33
4.2.3 Removing the Carriage Unit....................................................................... 34
4.2.4 Removing the Panel Board......................................................................... 36
4.2.5 Removing the Main Board ......................................................................... 37
4.2.6 Removing the Power Switch ...................................................................... 40
4.2.7 Removing the Panel FFC............................................................................ 41
4.2.8 Removing the Driven Pulley, Driven Pul
Holder Assy.......................................................... ..................................... 42
4.2.9 Removing the CR Motor Unit, Motor Tension Belt, and the CR Tension Belt
43
4.2.10 Removing TPU Lower Housing............................................................... 45
4.2.11 Removing the Sensor Board..................................................................... 46
4.2.12 Removing the Hinge Assy........................................................................ 46
4.2.13 Removing the TPU Unit Cable................................................................. 47
4.2.14 Removing the DRV Board ....................................................................... 48
4.2.15 Removing Torsion Spring ........................................................................ 49
4.2.16 Removing the TPU Carriage Unit............................................................ 50
4.2.17 Removing the TPU Inverter Board........................................................... 51
4.2.18 Removing the SUB_C Board, SUB_D Board, and the
4.2.19 Removing the TPU CR Motor.................................................................. 55
ley Spring, and the Driven Pulley
Lamp.................. 53
30
Chapter 5 ADJUSTMENT
5.1 Overview................................................................................... .......................... 58
5.1.1 Adjustment item ......................................................................................... 58
5.1.2 Adjustment method..................................................................................... 58
5.1.3 Adjustment of Torsion Springs on the
TPU CR Drive Belt....................... 58
6
EPSON Perfection 4490 Photo Revision A
Chapter 6 Maintenance
6.1 Overview ............................................................................................................. 60
6.1.1 Cleaning...................................................................................................... 60
6.1.2 Lubrication.................................................................................................. 60
Chapter 7 APPENDIX
7.1 Connectors........................................................................................................... 64
7.1.1 Connector Reference Table ........................................................................ 64
7.1.2 Connector Configuration ............................................................................ 64
7.2 Circuit Diagrams ................................................................................................. 65
7.3 Exploded diagram................................................................................................ 73
7.4 Parts List......................................... ..................................................................... 78
7.5 Optional Part; Auto Document Feeder....... ..
7.5.1 Overview..................................................................................................... 79
7.5.2 Basic specifications .................................................................................... 79
7.5.3 Interface...................................................................................................... 81
7.6 ADF; Disassembly............................................................................................... 82
7.6.1 Removal of B81334 Main Board................................................................
7.6.2 ASF Part...................................................................................................... 83
7.6.3 Disassembly of ASF and Frame.............
7.6.4 Disassembly of ASF Assembly..............
7.7 ADF; Lubrication ................................................................................................ 97
....................................................... 79
82
.................................................... 89
.................................................... 91
7
PRODUCT DESCRIPTION
CHAPTER
1
EPSON Perfection 4490 Photo Revision A
1.1 Features
The main features of the EPSON Perfection 4490 Photo are as follows.
Hig
Hig
Easy
h Quality
Opt
ical Resolution
4800 dpi (with 6-line color CCD, 124200 pixels)
Pi
xel Depth
16 bits per pixel (input and output)
h-Speed Scanning
11 second
12 second
*
When scanning a film at A4 300 dpi.
s for monochrome
s for color
-To-Use
EPSON Creativi
• Supports for a wide variety of file types; BMP, JPEG, TIFF, RAW,
ty Suites
PICT, PDF
• Thumbnail view support
• Link indicator function for easy scanning
• Multiple exposure levels from Natural to Vivid are preset for Auto
Exposure
Digital ICE for Film
Dust and scratch removal with hardware
Bui
High-Speed USB 2.0
Op
lt-in 2.7" x 9.3" transparency unit (TPU)
• 35 mm (135) strip film: 12 frames
• 35 mm (135) mounted film: 4 frames
• Medium format film (120/220): 1 frame
tion
A4 and legal size document can be scanned with the optional ADF unit
EPSON Scan
• Graphic user interface:
Full Auto Mode, Home Mode and Professional Mode
• Stand-alone application:
In addition to TWAIN driver function, saving images without using a
graphic application such as Photoshop is available
• Additional image editing tools:
histogram, multi-level unsharp mask, de-screening and tone-curve
editor
• Image enhancement functions:
dust remover, photo restoration and grain reduction
• Full automatic mode (flatbed and film)
• Thumbnail view support
• Supports both positive and negative monochrome films
PRODUCT DESCRIPTION Features 9
EPSON Perfection 4490 Photo Revision A
1.2 Specifications
BASIC SPECIFICATIONS
Scanner type
Flatbed, color
Scan
Photoelectric device
Effe
Maxim
Op
Maxim
Note *: The maximum hardware resolution of 4800 x 9600 dpi is achieved using EPSON's
Output Resolution
Sp
Pi
Com
ning method
Moving carriage, stationary document
6-line color CCD
(2.2 µm) with micro lens
ctive pixels
40,800 x 56,160 pixels at 4800 dpi
um document size and type
Flatbed: US letter or A4 size
8.5 x 11.7 inches (216 x 297 mm)
(Paper type for ADF: Fine quality paper, Bond paper, Check paper,
Recycled paper)
TPU: 35 mm (135) strip film x 12 frames (positive and negative films)
35 mm (135) mounted film x 4 frames (positive films)
Medium format film (120/220) x 1 frame (positive and negative films)
tical resolution
4800 dpi
um resolution
*
4800 dpi (main scan) x 9600 dpi hardware (sub scan)
Micro Step Drive technology. The motor basic step is 2400 dpi.
50 to 6400 dpi in 1 dpi increments, 9600 dpi, 12,800 dpi
eed (color)
16.832 msec/line at 4800 dpi in Draft mode
xel depth
16 bits per pixel (input and output)
mand level
ESC/I-D2, FS
Interfaces
USB 1.1/2
Ligh
.0
t source
White cold cathode fluorescent lamp
Reli
ability (MCBF)
36,000 cycles of carriage movement
Op
tion
ADF unit
Op
eration buttons
4 push buttons
Power Supply
AC adaptor
Document setting position
Rear-side right corner on the document glass ( Scanning home position )
ELECTRICAL
Main Unit
Rat
Input
Power co
ed voltage 24 VDC
voltage 24 to 26.4 VDC
nsumption
• Operation: 20 W
• Standby mode: 13.5 W
• Sleep mode: 3.8 W
Rated current 1.1 A
AC Ad
aptor
Rated
input voltage 100 - 120 VAC (100 V Model)
220 - 240 VAC (220 V Model)
Rated
Rated
input frequency 50 - 60 Hz (100 V, 200 V)
input current 0.7 A at 100 VAC
0.4 A at 200 VAC
Ou
tput voltage 24 - 26.4 VDC
PRODUCT DESCRIPTION Specifications 10
EPSON Perfection 4490 Photo Revision A
Rated ou tput current 1.1 A
Current
resistance 500 VDC: > 100 MΩ
(AC input terminal and DC output terminal)
Vol
tage resistance 3000 VAC for 1 min.
(AC input terminal and DC output terminal)
TP
U
Rated vo
In
Input
ltage 24 VDC
put voltage 24 - 26.4 VDC
current 0.3 A at 24 V
0.07 A at 5 V
ADF
Rated vo
In
Input
ltage 24 VDC, 5 VDC
put voltage 24 - 26.4 VDC, 5 VDC
current 0.8 A at 24 V
0.2 A at 5 V
Energ
y conservation International Energy Star Program compliant
Static electricity Contact discharge: 4.5 kV
Air discharge: 8.5 kV
ENVIRONMENTAL
Temperature
Operatio
St
n: 41 to 95 °F (5 to 35 °C)
orage: -13 to 140 °F (-25 to 60 °C)
EMC AND SAFETY STANDARDS COMPLIANCE
Scanner 100 V • FCC15B Class B (USA)
• CSA108.8 Class B (Canada) (FCC represents)
200 V • E N55022 (CISPR Pub22) Class B
• EN61000-3-2
• EN61000-3-3
• EN55024
• AS/NZS3548 Class B (Australia)
• Korea EMC
ection law
ection law
AC Adaptor
USB 2.0 I/F
• Russia consumer prot
• CCC (China)
100 V • UL1950/CSA C22.2 No.950 (North American, UL/CSA
Obtain by each other)
• UL1310/CSA C22.2 No.223 (As above)
• NOM (Mexico)
200 V • IEC60950 (Get CB report)
•GS (German)
• AS/NZS3260 (Australia)
• GOST (Russia)
• Singapore safety standard (Singapore)
• Russia consumer prot
• Korea safety regulation (Korea)
• Polish safety (Poland)
• Argentina safety (Argentina)
• SASO (Saudi Arabia)
• CCC (China)
Hum
idity (non-condensing)
Operatio
n: 10% to 80% (ADF: 20% to 80%)
Storage: 10% to 85%
OPERATING CONDITIONS
Ordinary office or home conditions; avoid extreme dust, direct sunlight, and strong
light sources
PRODUCT DESCRIPTION Specifications 11
EPSON Perfection 4490 Photo Revision A
1.3 Detailed Specifications
IMAGE PROCESSING FUNCTION
Gamma Correction 1 User defined level
Colo
Line Art
Operatin
USB 1.1 I/F • Microsoft
USB 2.0 I/F • Microsoft Windows 2000 Professional/XP Home Edition/XP
Note *: USB2.0 Host Driver by Microsoft is required
r Correction 1 User defined level
Fixed threshold
g System Compatibility
Interface Operating System
Windows 98SE/Me/2000 Professional/XP Home
Edition/ XP Professional(Pre-installed model or upgrade of
Windows 98/Me/2000 Professional pre-installed model)
• Mac OS X 10.2 or later
• Mac OS 9.1 or later (Only EHC)
Professional*
(Pre-installed model or upgrade of Windows
-installed model)
• Mac OS X 10.2.7 or later
2000 Professional pre
1.4 Interface
The interfaces of this scanner are shown below.
AC Input
TPU Unit Connector
Figure 1-1. Interface
USB INTERFACE
Interface type Universal Serial Bus Specification Revision 2.0
USB2.0
Ven
Prod
dor ID: 04B8h
uct ID: 0119h
Connector type One self-powered receptacle, Type B. Must be
connected directly to the host or to tier 1 in a hub
with a recommended USB cable.
PRODUCT DESCRIPTION Detailed Specifications 12
EPSON Perfection 4490 Photo Revision A
1.5 Exterior Specifications
1.5.1 Explanation of Switches
Start Button
Starts the EPSON Smart Panel.
Copy
Button
Prints photos and makes prints from films.
S
can to E-mail Button
Sends the scanned image by an e-mail.
Scan
to PDF Button
Starts scanning and stores the sccanned data.
1.5.2 Explanation of LED Indicators
Status LED
Located to the left of the Start Button. Indicates
light as shown in the table below.
LED Indication Status
Lit Green
Flashing green slowly Busy
Flashing red fast Error
Off Operate off:
Note *1: Warm up, scanning, initializing, etc.
Certain error conditions, such as Option Error, may not cause the Status LED to turn
*2:
red.
scanner statuses with a green or red
Ready
Scan to PDF Button
Scan to E-mail Button
Copy Button
Status LED
Start Button
Figure 1-2. Switches and LEDs
*1
*2
PRODUCT DESCRIPTION Exterior Specifications 13
EPSON Perfection 4490 Photo Revision A
1.5.3 Dimensions
Dimensions and Weight
Dim
Weig
ensions 272 x 475 x 113mm (W x D x H)
ht Approx. 4.0 kg (without AC adaptor)
4.113 kg (with AC adaptor)
External Drawing
475
272
113
70
Unit: mm
Figure 1-3. External Dimensi
ons of Perfection 4490 Photo
PRODUCT DESCRIPTION Exterior Specifications 14
EPSON Perfection 4490 Photo Revision A
1.5.4 Maximum Document Size and Placement
REFLECTIVE DOCUMENT
Size : 8.5 in (216 mm) W x 11.7 in (297 mm) H
8.5 in (216 mm) 1 ± 0.5 mm
Scanning home position
1.6 ± 0.5 mm
11.7 in (297 mm)
TRANSPARENT DOCUMENT
Size : 2.72 in (68 mm) W x 9.44 in (236 mm) H
67.56 ± 1.5 mm
2.72 in (68 mm)
13.48 ± 1.5 mm
Scanning home position
9.44 in (236 mm)
Front
Figure 1-4. Reflective Document Scanning Range
Figure 1-5. Transparent Docu
Front
ment Scanning Range
PRODUCT DESCRIPTION Exterior Specifications 15
EPSON Perfection 4490 Photo Revision A
1.6 Control Codes
The following table is the list of control codes by the scanner.
Category Command Name Code
Execution command ID request
Status request ESC F
Extended status request
Status setting request ESC S
Scan start
Push button status request ESC !
Extended ID request
Scanner status request FS F
Scanning parameter request
New scan start FS G
Data form setting Data format setting ESC D i
Resolution setting ESC R n1 n2
Scanning area setting
Color setting ESC C i
Parameter setting
Correction Processing Gamma correction setting ESC Z i
Gamma correction table setting
Image Processing Threshold value setting ESC t I
Support and
Miscellaneous
Scan mode setting ESC g i
Initialization ESC @
Line counter setting
Option control ESC e i
Film type designation
Paper exit FF
Paper loading
Warm-up cancel ESC w
ESC I
ESC f
ESC G
FS I
FS S
ESC A n1 n2 n3 n4
FS W
ESC z i d [256]
ESC d i
ESC N i
PF
Category Command Name Code
Control Normal response ACK
Abnormal response NACK
Scanning stop
Header STX
CAN
PRODUCT DESCRIPTION Control Codes 16
EPSON Perfection 4490 Photo Revision A
1.7 Error-Time Processing
Table 1-1. Error Definition and Remedy List
Category LED Indication Cause Scanner response Recovery
Command error None An invalid command or invalid
parameter was detected.
Fatal error Red LED flashes rapidly • The lamp is burnt out.
• The main unit is faulty.
• Firmware downloading failed.
command
• The scanner (interpreter) ignores the
incorrect command or parameter. Current
setting maintained.
• The Scanner (interpreter) returns NACK,
and waits for the next command parameter.
• The Scanner turns the carriage lamp off and
stops the operation.
• The Scanner sets Bit 7 of the status bit.
The error condition is cleared when the scanner
(interpreter) receives a valid command.
Turn the scanner off and then back on.
PRODUCT DESCRIPTION Error-Time Processing 17
OPERATING PRINCIPLES
CHAPTER
2
EPSON Perfection 4490 Photo Revision A
2.1 Engine Operation Outline
This section explains the functions and operating principles of the Perfection 4490
Photo Engine. The Engine is roughly divided into the Carriage Unit and Carriage
Moving Mechanism.
2.1.1 Carriage Unit outline
The Carriage Unit can be divided into the CCD Sensor Board, Inverter Board, Lamps
(light source), and Mirror/Lens Mechanism. (Refer to Fugure 2-1, 2-2.)
CCD
Inverter
Lamp
Mirror/Lens Mechanism
Sensor Board Forms an alternative six-lines color CCD (R, G, B
Board Boosts +24VDC and converts DC to AC to generate
s White cool cathode fluorescent lamps are used as a
independent) and its control and drive circuits.
the voltage for driving the Lamps (white cool cathode
fluorescent lamps).
light source. When the amount of light is not stable, the
Panel LED flashes and enter the standby mode until it
becomes stable.
The beam applied to the scanned document is reflected,
passes through the Mirror/Lens Mechanism in the
Carriage Unit for correction of the beam axis, and then
reaches the CCD Sensor. The light components R, G, B
are extracted by the Color CCD Sensor itself, not by
switching between R, G and B of the light source as
previously.
Figure 2-1. Carriage Unit Configuration
Figure 2-2. Mirror/Lens Mechanism
OPERATING PRINCIPLES Engine Operation Outline 19
EPSON Perfection 4490 Photo Revision A
2.1.2 TPU Carriage Unit Outline
The TPU Carriage Unit consists of TPU Inverter Board, Lamps (light source), SUB_C
Board, and SUB_D Board. (Refer to Fugure 2-3.)
Front
Rear
TPU Inverter Board
Figure 2-3. TPU Carriage Unit Configuration
Inverter Board
necessary to power the Lamps.
Lamps used as
the light output becomes unstable, the Panel LED flashes and the scanner enters
standby mode until it becomes stable.
SUB_C Board and SUB_D Board each
converts DC to AC and boosts the voltage to generate the current
the primary light source are white cool-cathode fluorescent lamps. If
Lamps
SUB_C Board
SUB_D Board
contain LEDs to generate infrared light.
OPERATING PRINCIPLES Engine Operation Outline 20
EPSON Perfection 4490 Photo Revision A
2.1.3 Carriage Moving Mechanism Operation
The image data of a document are scanned in the combination of the main scanning
direction (one line: CCD Sensor) and sub scanning direction (multiple lines: Carriage
Unit movement). (Refer to Fugure 2-4.)
The line type color CCD Sensor can only scan t
direction (in parallel with the Carriage Unit) at one time. To scan the data of the second
and latter lines in the sub scanning direction, the Carriage Unit having a built-in CCD
Sensor is moved by CR drive. The scanned data are sent to the Control Board. The
scanning of Line n data and the processing of Line n-1 image data are performed
consecutively at the same time.
1 pixel
Document
Main
scanning
he data of one line in the main scanning
Second line
First line
The Carriage Unit slides along the guide rail in the sub scanning direction. To perform
is sliding operation, the CR (Carriage) Motor transmits its drive power to the Timing
th
Belt, which is fixed to the Carriage Unit, via the Drive Pulley and Deceleration Gear.
The image data scanning start position is determined by the CR HP Sensor located on
the Control Board. A stepping motor used as the CR Motor is driven under open loop
control. (Refer to Fugure 2-5.)
Sub scanning (by Carriage movement)
Scanner Head
(Carriage)
Figure 2-5. Carriage Operation
Figure 2-4. Carriage Movement
OPERATING PRINCIPLES Engine Operation Outline 21
EPSON Perfection 4490 Photo Revision A
2.1.4 TPU Carriage Drive Mechanism Operation
The TPU Carriage Unit slides along the guide shaft in the secondary scanning direction
as the TPU CR (Carriage) Motor transmits its drive power to the TPU CR Drive Belt
connected to the TPU Carriage Unit, via the Idle Pulley and Drive Pulley. (Refer to
Fugure 2-6.) The TPU CR Motor uses a stepper motor and is driven under open loop
control.
TPU CR Drive Belt TPU Carriage Unit
Front
Rear
Drive Pulley Idle Pulley
Figure 2-6. TPU Carriage Operation
OPERATING PRINCIPLES Engine Operation Outline 22
EPSON Perfection 4490 Photo Revision A
2.2 Digital ICE Function Operation
This scanner features Digital ICE for Film, an image correction process that uses a
combination of hardware and software to detect and eliminate physical flaws, dust or
dirt, either on the Film or the scanner itself. (Film includes color or monochrome
negative, and color positive.)
2.2.1 Digital ICE for Film Overview
Because of its longer wavelength, infrared light normally passes completely through
film media, such as negatives or slides, during a scan. Physical flaws or dust, however,
do block infrared light. When a film document with dust or physical flaws is scanned
using infrared light, the light is physically blocked by the flaw or dust, and the resulting
image clearly shows only the dust and/or flaws present. By superimposing the images
scanned with infrared light and visible light, the Film-ICE software is able to detect the
inconsistency in the digitized data caused by the flaw and automatically remove it
using interpolated image data to overwrite and correct the image. Because of the
difference in wavelength between infrared light and visible light, a secondary lens
("Glass Plate" in the images below) must be employed during the Film-ICE visiblelight scan to compensate for the resulting difference in the size of the images so that
they can be superimposed accurately. The Glass Plate is moved into and out of position
by a solenoid.
Lens CCDGlass Plate
Digita
1. Read the visible light position. Two holes in the upper housing are scanned with
2. Move the secondary lens (Glass Plate) into posi
3. Retract the secondary lens and scan the film
4. Electronically superimpose the images obt
5. Replace the "flaw" image data with image data interpolated
l ICE for Film Process Sequence
vi
sible light in order to register the home position of image being scanned.
tion and scan the film in visible-
light.
in infrared-light.
ained from each light source and
identify the physical flaws and/or foreign matter.
from adjacent areas.
Dirt on the Slide After Correction
Infrared Light
Lens CCDGlass Plate
Visible Light
Figure 2-7. Refraction of Infrared Light and Visible Light
Figure 2-8. Extraction/Correction of
Dust by Film-ICE Function
OPERATING PRINCIPLES Digital ICE Function Operation 23
EPSON Perfection 4490 Photo Revision A
2.3 Operation Principle of Electric Circuit
The following electric circuits are used in the scanner.
Main Board
Table 2-1. Main Board IC
Name Location Details
S1R77001F00A2 IC4 ASIC: Host base scanner controller
S1R720G0F00A0 IC6 ASIC: UTM (USB2.0 interface)
EDS6416AHTA-75-E IC3
TB62205F IC1
AP1120SLA IC2
M74HC595AM13TR IC5 Serial-Parallel converter
CCD Board
Table 2-2. CCD Board IC
Name Location Details
ILX580K IC1 CCD
AK8415 IC4 16bit A/D converter
E02A41YA IC5
SN74ACT244NSR IC2, IC3 CCD drive buffer
KIA78M05F-RTF/P IC6
Pan
el Board
This board has four buttons (Start/Copy/Scan to E-mail/Scan to PDF) and LED
lamp.
SDRAM 1M x16bit x4bank
Motor Driver + DC-DC converter CR Motor Drive
+24V IN, +12V/+5V OUT
DC-DC converter
+5V IN, +3.3V/+2.5V OUT
ASIC: CCD/AFE drive signal generator
DC-DC converter
+12V IN, +5V OUT
Power supply
canner is powered with 24 VDC voltage from the AC adapter.
The s
AC adap
• Rated output DC24 1.1A
• Input Voltage AC100-120V ± 15% (100V)
ter rated voltage
AC220-240V ± 10% (200V)
• Rated Input Current 0.7A (AC 100V system)
0.4A (AC 200V system)
• Input Frequency Range 50 to 60Hz ± 0.3Hz
• Output Voltage DC24 to 26.4V
The 24 VDC voltage is supplied to CN4 on the Main Board. A
between the DC jack and the Main Board.
DRV
Board (TPU Unit)
Table 2-3. DRV Board IC
Name Location Details
M74HC595RM13TR IC1, IC2 8bit Shift Register
LB11847L-E IC3 TPU CR Motor Driver
CD74HC75M96 IC5 Lamp/LED controller
AD
F Board (Option)
Table 2-4. ADF Board IC
Name Location Details
M54670P IC2 ADF Motor driver
MM74HC165M IC3 Parallel-Serial Converter
M66311FP-250D IC1
MM74HCT04M IC4 Buffer IC
Serial-Parallel Converter
power switch is located
OPERATING PRINCIPLES Operation Principle of Electric Circuit 24
TROUBLESHOOTING
CHAPTER
3
EPSON Perfection 4490 Photo Revision A
3.1 Overview
This chapter explains the remedies for errors detected by the scanner’s self-diagnostic
function, and provides a troubleshooting guide based on observed ploblems.
3.1.1 Self-Diagnosing
This scanner has a self-diagnostic function that automatically diagnoses the operating
status of major components, and uses an LED indication to show the error status. This
function detects the following error statuses shown in the table below. The corrective
action is also listed.
COMMAND ERROR
Table 3-1. Command Error
LED Indication Cause Disposition
• Unidentifed command is
detected.
(None)
Recovery The error condition is canceled upon receipt of a valid command.
• T he scanner (interpreter)
ignores the incorrect command
or parameter. The current
settings are maintained.
• Scanner (interpreter) returns
NACK, and waits for the next
command or parameter.
OPTION ERROR
(Only when the Option Unit is fitted and the scanner is ready to operate under the
control command (ESC e))
Table 3-3. Option Error
LED Indication Cause Disposition
• T he cover is open.
• Document is not loaded.
(None)
Recovery Remove the error cause to recover.
Receivable command [ESC F, ESC f, ESC @]
• The Scanner sets Bit 7 of the
status bit.
FATAL ERROR
Table 3-2. Fatal error
LED Indication Cause Disposition
• The lamp is burnt out.
• The main unit is faulty.
• Firmware downloading failed.
(Rapid flashing, red)
Recovery Turn the scanner off and then back on.
• T he Scanner turns the carriage
lamp off and stops the operation.
• T he Scanner sets Bit 7 of the
status bit.
TROUBLESHOOTING Overview 26
EPSON Perfection 4490 Photo Revision A
3.2 Troubleshooting
This section provides troubleshooting procedures based on observed faults.
Refer to Tab
the table, find the Problem that most closely matches what you observe and follow the
procedures given in the table cross referenced in the right-hand column.
Scanned image quality error. Scanned image is not clear.
The main unit does not operate
when powered-on.
Fatal error. (The LED flashes red.)
Recovery cannot be made when
power is switched on again.
The TPU does not work at all. The TPU does not operate. 3-10
le 3-4, and choose the table describes the general fault indication. Within
Table 3-4. Trouble Phenomenon, Cause and Troubleshooting Table
Problem Definition
Troubleshooting
Table
3-5
The Main Unit does not perform
initialization operation.
The host does not recognize the
scanner when power is switched on.
The Carriage Unit does not operate. 3-8
The Fluorescent Lamps are not lit.
The TPU Carriage Unit does not
operate.
The Fluorescent Lamps of the TPU do
not light up.
3-6
3-7
3-9
3-11
3-12
Table 3-5. Scanned Image Quality Error.
Step Possible Cause Corrective Action
The Document Glass is not clean. (Image
1
has white spots)
The mirror in the Carriage is not clean.
2
(Vertical bands appear on the image.)
Upper Housing failure
3
(
The white document mat is deformed or is
not clean.)
4 CCD Sensor Board failure Replace the Carriage Unit.
5 Main Board failure
6 Carriage mechanism failure Replace the Carriage mechanism.
Clean the glass.
(Refer to 6.1.1 Cleaning)
Clean the mirror.
(Refer to 6.1.1 Cleaning)
Replace the Upper Housing.
Replace the Main Board
Table 3-6. The Main Unit does not perform initialization operation.
Step Possible Cause Corrective Action
There are some connectors that are not
1
connected correctly
2 CR Motor failure Replace the CR Motor.
3 Main Board failure Replace the Main Board
Connect them correctly.
Replace the Main Board
Table 3-7. The host does not recognize the scanner when power is switched on.
Step Possible Cause Corrective Action
1 The host computer does not support USB.
The TWAIN Driver supplied with the
2
scanner has not been installed correctly.
3 The USB cable is damaged.
4 Main Board failure Replace the Main Board
Replace or modify the host computer.
Install (reinstall) the TWAIN Driver for the
Perfection 4490 Photo.
Replace the USB cable.
TROUBLESHOOTING Troubleshooting 27
EPSON Perfection 4490 Photo Revision A
Table 3-8. The Carriage Unit does not operate.
Step Possible Cause Corrective Action
1 The Carriage Lock has not been released.
2
The Upper Housing is not installed corr ectly.
Connector CN1 on the Main Board is not
3
conn
ected.
4
The Carriage FFC is not connected correctly.
Carriage Mechanism failure
5
Release the Carriage Lock.
Install it normally.
Connect it correctly.
Connect the FFC correctly.
Replace the Main Board
Does the CR Motor operate normally?
↓
Yes
→ Disassemble and reassemble the
scanner, or replace the corresponding part(s).
No → Replace the CR Motor.
Table 3-9. The Fluorescent Lamps are not lit.
Step Possible Cause Corrective Action
Connector CN1 on the Main Board is not
ected.
conn
1
Connector CN1 and CN2 on the CCD
Board are not connected.
The lamp is not set on the Inverter Board
2
correctly.
Carriage Unit failure ( The Carriage FFC is
3
4 Main Board failure Replace the Main Board
nected to the Main Board and the
not con
Carriage.)
Connect the disconnected connectors.
Set the lamp on the board correctly.
Replace the Carriage Unit.
Table 3-10. The TPU does not operate.
Step Possible Cause Corrective Action
The TPU Unit Cable is not connected to the
1
in unit.
ma
Connector CN5 is not connected to the
2
Main Board.
3 Main Board failure
Connect the Cable to the main unit.
Connect it correctly.
Replace the Main Board
Table 3-11. The TPU Carriage Unit does not operate.
Step Possible Cause Corrective Action
The TPU Unit Cable is not connected to the
1
ma
in unit.
The TPU Carriage Lock has not been
2
released.
The TPU Lower Housing
3
correctly.
The three torsion springs are not
attached to the TPU CR Drive Belt
correctly.
• The TPU CR Motor does not
4
5 TPU CR Motor failure Replace the TPU CR Motor.
6 DRV Board failure Replace the DRV Board.
7 Main Board failure Replace the Main Board
move normally when poweredon with the TPU Lower Housing
removed.
• The TPU Carriage Unit does not
move normally with the TPU CR
Motor removed.
The TPU Carriage Mechanism
Failure.
is not installed
Connect the TPU Cable to the main unit.
Release the TPU Carriage Lock.
Reinstall it correctly.
Attach them to the belt correctly.
Replace the TPU Carriage Unit.
Table 3-12. The Fluorescent Lamps of the TPU do not light up
Step Possible Cause Corrective Action
The DRV Inverter FFC is not connected to
1
N1 on the TPU Inverter Board and CN3
C
on the DRV Inverter Board.
CN2, CN3, and CN4 on the TPU Inverter
2
Board are not connected.
Failure of the SUB_C Board and the
3
SUB_D Board
4 DRV Board failure Replace the DRV Board.
5 Main Board failure
Connect the FFC to CN1 and CN3
Connectors.
Connect the connectors.
Replace the SUB_C Board and the SUB_D
Board.
Replace the Main Board
TROUBLESHOOTING Troubleshooting 28
DISASSEMBLY / ASSEMBLY
CHAPTER
4
EPSON Perfection 4490 Photo Revision A
4.1 Overview
This chapter explains the procedures for disassembling the major units and parts of the
product. Unless otherwise explained, reassembly should be carried out in the reverse
order of the disassembly procedure. When you have to remove any parts or
components that are not described in this chapter, refer to the exploded diagram in the
Appendix.
Before starting disassembly, always read the
4.1.1 Precautions
Before starting the disassembly or reassembly of the product, read the following
precautions given under the headings WARNING and CAUTION.
W A R N I N G
C A U T I O N
Before disassembling or reassembling this product, always
disconnect the Power Cable and Interface Cable. When you
have to work with power on for voltage measurement, etc., use
extreme care not to get an electric shock and do the work in
accordance with the procedures given in this manual.
To prevent your hands from being cut by sharp edges, always
wear gloves before starting disassembly or reassembly.
When touching any internal components, use static electricity
discharge equipment such as anti-static wrist straps.
Provide sufficient work space for disassembling and
reassembling.
Always use only the recommended tools for disassembly,
reassembly and adjustment.
Be sure to tighten the screws to the specified torque.
Use the specified grease for lubrication. Refer to Chapter 6 for
details.
Since a prototype was used to illustrate these disassembly and
assembly procedures, the appearance of some parts may differ
from those on an actual product. The procedures themselves,
however, are accurate for the retail model.
precautions described in the next section.
4.1.2 Recommended Tools
To protect this product from damage, use the tools indicated in the following table.
Table 4-1. Specified Tools
Name Epson Part Number
Phillips screwdriver, No. 2
Flat-blade screwdriver 1080527
Tweezers
Long-nose pliers 1080561
1080532
1080561
4.1.3 Recommended Screws
The following table indicates the screws used in the EPSON Perfection 4490 Photo
Scanner.
Table 4-2. Recommended Screws
No. Name Type
1 C.B.P. 3 x 6
2 C.B.P. 3 x 8 Phil lips Bind P-tit e Screw, size M3, 8 mm length
3 C.B.P. 3 x 12
4 C.P. 3 x 8 Phillips Pan Head Screw, size M3, 4 mm length
5 C.B. 3 x 3
6 C.B.P. 4 x 12 Phillips Bind P-tite Screw, size M3, 8 mm length
7 C.B.S. 3 x 5
8 C.P.F.P. 3 x 8 Phillips Pan Flange Head P-tite Screw, size M3, 8 mm length
Phillips Bind P-tite Screw, size M3, 8 mm length
Phillips Bind P-tite Screw, size M3, 8 mm length
Phillips Bind Screw, size M3, 3 mm length
Phillips Bind S-tite Screw, size M3, 5 mm length
Disassembly / Assembly Overview 30
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