Epson V500 User manual

EPSON Perfection V500 Photo
Color Image Scanner
Service Manual
SESC07002

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 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.
The contents of this manual are subject to change without notice.
The above not withstanding SEIKO EPSON CORPORATION can assume no responsibility for any errors in this manual or the consequences thereof.
EPSON is a registered trademark of SEIKO EPSON CORPORATION.
General Notice:Other product names used herein are for identification purpose only and may be trademarks or registered trademarks of their respec-
tive owners. EPSON disclaims any and all rights in those marks.
Copyright © 2007 SEIKO EPSON CORPORATION.
Imaging Products CS, PL & Environmental Management

PRECAUTIONS
Precautionary notations throughout the text are categorized relative to 1) Personal injury and 2) damage to equipment.
DANGER Signals a precaution which, if ignored, could result in serious or fatal personal injury. Great caution should be exercised in performing procedures preceded by
DANGER Headings.
WARNING Signals a precaution which, if ignored, could result in damage to equipment.
The precautionary measures itemized below should always be observed when performing repair/maintenance procedures.
DANGER
1. ALWAYS DISCONNECT THE PRODUCT FROM THE POWER SOURCE AND PERIPHERAL DEVICES PERFORMING ANY MAINTENANCE OR REPAIR PROCEDURES.
2. 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.
3. WHEN PERFORMING TESTING AS DICTATED WITHIN THIS MANUAL, DO NOT CONNECT THE UNIT TO A POWER SOURCE UNTIL INSTRUCTED TO DO SO. WHEN THE
POWER SUPPLY CABLE MUST BE CONNECTED, USE EXTREME CAUTION IN WORKING ON POWER SUPPLY AND OTHER ELECTRONIC COMPONENTS.
4. WHEN DISASSEMBLING OR ASSEMBLING A PRODUCT, MAKE 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 AS THE RATED VOLTAGE, LISTED ON THE SERIAL NUMBER/RATING PLATE. IF THE EPSON PRODUCT
HAS A PRIMARY AC RATING DIFFERENT FROM AVAILABLE POWER SOURCE, DO NOT CONNECT IT TO THE POWER SOURCE.
3. ALWAYS VERIFY THAT THE EPSON PRODUCT HAS BEEN DISCONNECTED FROM THE POWER SOURCE BEFORE REMOVING OR REPLACING PRINTED CIRCUIT BOARDS
AND/OR INDIVIDUAL CHIPS.
4. IN ORDER TO PROTECT SENSITIVE MICROPROCESSORS AND CIRCUITRY, USE STATIC DISCHARGE EQUIPMENT, SUCH AS ANTI-STATIC WRIST STRAPS, WHEN
ACCESSING INTERNAL COMPONENTS.
5. DO NOT REPLACE IMPERFECTLY FUNCTIONING COMPONENTS WITH COMPONENTS WHICH ARE NOT MANUFACTURED BY EPSON. IF SECOND SOURCE IC OR OTHER
COMPONENTS WHICH HAVE NOT BEEN APPROVED ARE USED, THEY COULD CAUSE DAMAGE TO THE EPSON PRODUCT, OR COULD VOID THE WARRANTY OFFERED
BY EPSON.
6. WHEN USING COMPRESSED AIR PRODUCTS; SUCH AS AIR DUSTER, FOR CLEANING DURING REPAIR AND MAINTENANCE, THE USE OF SUCH PRODUCTS CONTAINING
FLAMMABLE GAS IS PROHIBITED.

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.MAINTENANCE
Provides preventive maintenance procedures and the lists of Epson-
approved lubricants and adhesives required for servicing the product.
APPENDIX Provides the following additional information for reference:
• Connector pin assignments
• Exploded diagram/Parts List
• Electrical circuit boards schematics
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.
Indicates an operating or maintenance procedure, practice or
condition that is necessary to keep the product’s quality.
Indicates an operating or maintenance procedure, practice, or
condition that, if not strictly observed, could result in damage to, or
destruction of, equipment.
May indicate an operating or maintenance procedure, practice or
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 maintenance procedure, practice or
condition that, if not strictly observed, could result in injury or loss
of life.
Indicates a product reassembly procedure, practice or condition that
must be executed in accordance with the specified standards to keep
the product's quality.
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
CHECK
P O I N T
W ARNING

Revision Status
Revision Date of Issue Description
AAugust 3, 2007 First release

EPSON Perfection V500 Photo Revision A
6
Contents
Chapter 1 PRODUCT DESCRIPTION
1.1 Features.................................................................................................................. 9
1.2 Specifications ...................................................................................................... 10
1.3 Operating 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.................................................. 15
1.6 Control Codes...................................................................................................... 16
1.7 Error-Time Processing......................................................................................... 17
Chapter 2 OPERATING PRINCIPLES
2.1 Engine Operation Outline.................................................................................... 19
2.1.1 Carriage Unit outline .................................................................................. 19
2.1.2 Carriage Moving Mechanism Operation .................................................... 20
2.1.3 TPU Carriage Unit Outline......................................................................... 21
2.1.4 TPU Carriage Drive Mechanism Operation ............................................... 21
2.2 Digital ICE Function Operation .......................................................................... 22
2.2.1 Digital ICE for Film Overview................................................................... 22
2.3 Operation Principle of Electric Circuit................................................................ 23
Chapter 3 TROUBLESHOOTING
3.1 Overview ............................................................................................................. 25
3.1.1 Self-Diagnosing .......................................................................................... 25
3.2 Troubleshooting................................................................................................... 25
Chapter 4 DISASSEMBLY / ASSEMBLY
4.1 Overview ............................................................................................................. 29
4.1.1 Precautions.................................................................................................. 29
4.1.2 Recommended Tools .................................................................................. 29
4.1.3 Recommended Screws................................................................................ 29
4.2 Disassembly Procedure ....................................................................................... 30
4.2.1 Removing the TPU Unit ............................................................................. 31
4.2.2 Removing the Upper Housing .................................................................... 32
4.2.3 Removing the Carriage Unit....................................................................... 33
4.2.4 Removing the Panel Board ......................................................................... 35
4.2.5 Removing the Main Board ......................................................................... 36
4.2.6 Removing the Power Switch ...................................................................... 38
4.2.7 Removing the Panel FFC............................................................................ 39
4.2.8 Removing the Driven Pulley, Driven Pulley Spring, and the Driven Pulley
Holder Assy. .............................................................................................. 40
4.2.9 Removing the CR Motor Unit, Motor Timing Belt, and the CR Timing Belt .... 41
4.2.10 Removing TPU Lower Housing............................................................... 43
4.2.11 Removing the Sensor Board..................................................................... 44
4.2.12 Removing the Hinge Assy........................................................................ 44
4.2.13 Removing the TPU Unit Cable................................................................. 45
4.2.14 Removing the DRV Board ....................................................................... 46
4.2.15 Removing the TPU Carriage Unit ............................................................ 46
4.2.16 Removing the SUB-C Board, LM-B Board ............................................. 48
4.2.17 Removing the TPU CR Motor.................................................................. 50
Chapter 5 ADJUSTMENT
5.1 Overview ............................................................................................................. 53
5.1.1 Adjustment item ......................................................................................... 53
5.1.2 Adjustment method..................................................................................... 53

EPSON Perfection V500 Photo Revision A
7
Chapter 6 MAINTENANCE
6.1 Overview ............................................................................................................. 55
6.1.1 Cleaning...................................................................................................... 55
6.1.2 Lubrication.................................................................................................. 55
Chapter 7 APPENDIX
7.1 Connectors........................................................................................................... 59
7.1.1 Connector Reference Table ........................................................................ 59
7.1.2 Connector Configuration ............................................................................ 59
7.2 Exploded Diagram / Parts List ............................................................................ 60
7.3 Circuit Diagrams ................................................................................................. 61

CHAPTER
1
PRODUCT DESCRIPTION

EPSON Perfection V500 Photo Revision A
PRODUCT DESCRIPTION Features 9
1.1 Features
The main features of the EPSON Perfection V500 Photo are as follows.
High Quality
Optical Resolution
6400 dpi (with 12-line color CCD, 170,880 pixels)
Pixel Depth
16 bits per pixel (input and output)
High-Speed Scanning
14 seconds for monochrome
15 seconds for color
NOTE: When scanning A4 document at 300 dpi in the draft mode with the host of
the following conditions; Pentium-4, 3.2GHz, 1GB RAM, Windows XP,
Photoshop 7.0E.
Easy-To-Use
EPSON Creativity Suites
•Supports for a wide variety of file types; BMP, JPEG, TIFF, PICT,
PDF
•Thumbnail view support
•Link indicator function for easy scanning
EPSON Scan
•Graphic user interface:
Full Auto Mode (for scanning both film and reflective document),
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
•Automatic detection of up/down sides of an image
•PDF creation
Scans multiple pages and creates a PDF file with the touch of a button.
A font-embedded PDF that enables keyword searching and a high
compression PDF also can be created.
•Improved color restoration function for negative films
•Fringe Correction for film scanning at lower than 3200 dpi
•Supports up to 21,000 x 30,000 pixels of scanning size (only for
reflective document)
Lid-type TPU (equipped as standard)
Built-in 2.7" x 9.3" transparency unit (TPU) enables to scan the following films
•35mm x 12 frames (strip films) or 35mm x 6 frames x 2 columns
positive or negative films
•35mm x 4 frames (mounted films) positive films
•Medium format (120/220) positive or negative films
Interface
Supports USB 2.0 High Speed
Option
A4 and legal size document can be scanned with the optional ADF unit

EPSON Perfection V500 Photo Revision A
PRODUCT DESCRIPTION Specifications 10
1.2 Specifications
BASIC SPECIFICATIONS
Table 1-1. Basic Specifications
Scanner type Flatbed, color
Scanning method Moving carriage, stationary document
Photoelectric device 12-line color CCD with micro lens
Maximum
scanning range
Reflective 216 x 297 mm (8.5” x 11.7”)
Film 68.58 x 236.9 mm (2.7” x 9.3”)
Maximum
document size
Reflective A4 or US letter size
Film • 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)
Maximum effective pixels 54,400 (main) x 74,880 (sub) pixels at 6400 dpi
Maximum output pixels 21,000 (main) x 30,000 (sub) pixels (reflective document)
Optical resolution • Main scan: 6400 dpi
(with 12-line CCD 170,880 pixels)
• Sub scan: 9600 dpi (with the micro step drive)
Output Resolution 50 to 6400 dpi in 1 dpi increments, 9600 dpi, 12,800 dpi
Pixel depth 16 bits per pixel (input and output)
Speed • Monochrome: 10.440 msec/line
• Full color: 10.440 msec/line
(when scanning reflective document at 1200 dpi in draft mode)
Interface USB 2.0 High-Speed, USB1.1
Light source White LED
Operation buttons 4 push buttons
(Start, Copy, Scan to E-Mail, Scan to PDF)
Command level ESC/I-D2
Table 1-2. Electrical Specifications
Main Unit
Rated voltage 24 VDC
Input voltage range 24 to 26.4 VDC
Rated current 1.3 A
Power consumption Operating 16 W
(17.5W when the ADF unit is installed)
Standby 7.5 W
(6.5W when the ADF unit is installed)
Sleep 4.0 W
Power button off 0.4 W
AC adapter
Rated voltage 100 - 120 VAC (100 V Model)
220 - 240 VAC (220 V Model)
Input voltage range 100 - 120 VAC +/- 15% (100 V Model)
220 - 240 VAC +/- 15% (220 V Model)
Rated input current 1.0 A at 100 VAC
0.5 A at 200 VAC
Rated input frequency 50 - 60 Hz
Rated input frequency range 50 - 60 Hz +/- 3Hz
Output voltage 24 VDC
Output voltage range 24 - 26.4 VDC
Rated output current 1.3 A
Current resistance 500 VDC: > 100 MΩ
(AC input terminal and DC output terminal)
Voltage resistance 3000 VAC for 1 min.
(AC input terminal and DC output terminal)
TPU
Rated voltage 24 VDC
Input voltage 24 - 26.4 VDC
Input current 0.3 A at 24 V
0.07 A at 5 V

EPSON Perfection V500 Photo Revision A
PRODUCT DESCRIPTION Specifications 11
EMC AND SAFETY STANDARDS COMPLIANCE
ENERGY CONSERVATION
International Energy Star™Program compliant
STATIC ELECTRICITY
Contact discharge: 2 kV, 4kV, 5kV
Air discharge: 2 kV, 4kV, 8kV, 10kV
ENVIRONMENTAL
OPERATING CONDITIONS
Ordinary office or home conditions; avoid extreme dust, direct sunlight, and strong
light sources.
RELIABILITY (MCBF)
Main unit: 30,000 cycles of carriage movement
TPU: 21,000 cycles of TPU carriage movement
SUPPORTED DOCUMENT
Reflective document
Photographs, printed materials, which have a smooth surface.
Films
35mm x 12 frames (negative/positive strip film)
35mm x 4 frames (negative/positive mounted film)
Medium format film (120/220) (negative/positive)
Scanner 100 V • FCC Part 15 Subpart B Class B (USA)
• CAN/CSA-CEI/IEC CISPR 22 (Canada)
• CNS13438 Class B, CNS14336 (Taiwan)
200 V • EN55022 Class B, EN55024 (EU)
• GOST-R (IEC60950-1, IEC60825-1, CISPR 22) (Russia)
• GB4943, GB9254 Class B, GB17625.1 (China)
• KN22 Class B, KN61000-4-2/-3/-4/-5/-6/-11 (Korea)
• AS/NZS CISPR22 Class B (Australia)
AC Adaptor 100 V • FCC Part 15 Subpart B Class B, UL60950-1 (USA)
• CAN/CSA-C22.2 No.60950-1
CAN/CSA-CEI/IEC CISPR 22 (Canada)
• NOM-019-SCFI-1998 (Mexico)
• CNS13438 Class B, CNS14336 (Taiwan)
200 V • EN60950-1, EN55022 Class B, EN55024, EN61000-3-2,
EN61000-3-3 (EU)
• EN60950-1 (German)
• IEC60950-1 (Singapore / Hong Kong / Argentina / Saudi
Arabia)
• GOST-R (IEC60950-1, CISPR 22) (Russia)
• GB4943, GB9254 Class B, GB17625.1 (China)
• K60950, KN14, KN14-1 (Korea)
• AS/NZS 60950.1, AS/NZS CISPR22 Class B (Australia)
Table 1-3. Environmental Conditions
Scanner unit ADF (Option)
Temperature Operation 50 to 95 °F (10 to 35 °C) 50 to 89.6 °F (10 to 32 °C)
Storage -13 to 140 °F (-25 to 60 °C) -4 to 140 °F (-20 to 60 °C)
Humidity
(non-condensing)
Operation 10% to 80% 20% to 80%
Storage 10% to 85%

EPSON Perfection V500 Photo Revision A
PRODUCT DESCRIPTION Operating Specifications 12
1.3 Operating Specifications
Operating System Compatibility
1.4 Interface
The interfaces of this scanner are shown below.
Figure 1-1. Interface
USB INTERFACE
Interface type Universal Serial Bus Specification Revision 2.0
Vendor ID: 04B8h
Product ID: 0130h
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.
Interface Operating System
USB 1.1 I/F • Microsoft Windows Vista
• Microsoft Windows XP Home/Professional/Professional x64
• Microsoft Windows 2000 Professional
• Microsoft Windows 98/98SE/Me
(Pre-installed model or upgrade of Windows 98/Me/2000
Professional pre-installed model)
• Mac OS X 10.2.8 or later (supports by using Universal Binary)
USB 2.0 I/F • Microsoft Windows Vista
• Microsoft Windows XP Home/Professional
• Microsoft Windows 2000 Professional
(Pre-installed model equipped with USB 2.0 interface as standard or
upgrade of Windows 2000 Professional pre-installed model.
Microsoft USB2.0 driver is required )
• Mac OS X 10.2.8 or later
(equipped with USB 2.0 interface as standard)
TPU Unit Connector
AC Input
USB2.0

EPSON Perfection V500 Photo Revision A
PRODUCT DESCRIPTION Exterior Specifications 13
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.
Scan to E-mail Button
Sends the scanned image by an e-mail.
Scan to PDF Button
Starts scanning and stores the scanned data.
1.5.2 Explanation of LED Indicators
Status LED
Located to the left of the Start Button. Indicates scanner statuses with a green or orange
light as shown in the table below.
Note *1: Warm up, scanning, initializing, etc.
*2:
Certain error conditions, such as Option Error, may not cause the Status LED to turn
orange.
Figure 1-2. Buttons and LEDs
LED Indication Status
Lit Green Ready
Flashing green slowly Busy*1
Flashing orange fast Error*2
Off Operate off:
Scan to PDF Button Status LED
Copy Button
Scan to E-mail Button Start Button
Power Switch

EPSON Perfection V500 Photo Revision A
PRODUCT DESCRIPTION Exterior Specifications 14
1.5.3 Dimensions
Dimensions and Weight
Dimensions 272 x 475 x 113mm (W x D x H)
Weight Approx. 4.0 kg (without AC adaptor)
4.113 kg (with AC adaptor)
External Drawing
Figure 1-3. External Dimensions of Perfection V500 Photo
Unit: mm
73
113
272
475

EPSON Perfection V500 Photo Revision A
PRODUCT DESCRIPTION Exterior Specifications 15
1.5.4 Maximum Document Size and Placement
REFLECTIVE DOCUMENT
Size : 8.5 in (216 mm) W x 11.7 in (297 mm) H
Figure 1-4. Reflective Document Scanning Range
TRANSPARENT DOCUMENT
Size : 2.7 in (68.58 mm) W x 9.33 in (236.9 mm) H
Figure 1-5. Transparent Document Scanning Range
8.5 in (216 mm) 1 ± 0.5 mm
1.6 ± 0.5 mm
11.7 in (297 mm)
Scanning home position
Front
2.7 in (68.58 mm)
67.56 mm
13.48 mm
9.33 in (236.9 mm)
Front
Scanning home position

EPSON Perfection V500 Photo Revision A
PRODUCT DESCRIPTION Control Codes 16
1.6 Control Codes
The following table is the list of control codes by the scanner.
Category Command Name Code
Execution command ID request ESC I
Status request ESC F
Extended status request ESC f
Status setting request ESC S
Scan start ESC G
Push button status request ESC !
Extended ID request FS I
Scanner status request FS F
Scanning parameter request FS S
New scan start FS G
Data form setting Data format setting ESC D i
Resolution setting ESC R n1 n2
Scanning area setting ESC A n1 n2 n3 n4
Color setting ESC C i
Parameter setting FS W
Correction Processing Gamma correction setting ESC Z i
Gamma correction table setting ESC z i d [256]
Image Processing Threshold value setting ESC t I
Support and
Miscellaneous
Scan mode setting ESC g i
Initialization ESC @
Line counter setting ESC d i
Option control ESC e i
Film type designation ESC N i
Paper exit FF
Paper loading PF
Warm-up cancel ESC w
Control Normal response ACK
Abnormal response NACK
Scanning stop CAN
Header STX
Category Command Name Code

EPSON Perfection V500 Photo Revision A
PRODUCT DESCRIPTION Error-Time Processing 17
1.7 Error-Time Processing
Table 1-4. Error Definition and Remedy List
Category LED Indication Cause Scanner response Recovery
Command error None An invalid command or invalid command
parameter was detected.
• 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 error condition is cleared when the scanner
(interpreter) receives a valid command.
Fatal error Orange LED flashes rapidly • The main unit is faulty.
(the carriage does not return to the home
position or any other mechanical error)
• Firmware downloading failed.
• The Scanner turns the LED off and stops the
operation.
• The Scanner sets Bit 7 of the status bit.
Turn the scanner off and then back on.

CHAPTER
2
OPERATING PRINCIPLES

EPSON Perfection V500 Photo Revision A
OPERATING PRINCIPLES Engine Operation Outline 19
2.1 Engine Operation Outline
This section explains the functions and operating principles of the Perfection V500
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, LED Board (light
source), and Mirror/Lens Mechanism. (Refer to Fugure 2-1, 2-2.)
Figure 2-1. Carriage Unit Configuration
CCD Sensor Board Forms an alternative 12-lines color CCD (R, G, B
independent) and its control and drive circuits.
LED Board White LED is used as a light source.
Mirror/Lens Mechanism 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 2-2. Mirror/Lens Mechanism
B(main2)
B(sub2)
B(main1)
B(sub1)
G(main1)
G(sub1)
G(main2)
G(sub2)
R(main1)
R(sub1)
R(main2)
R(sub2)

EPSON Perfection V500 Photo Revision A
OPERATING PRINCIPLES Engine Operation Outline 20
2.1.2 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 2-3.)
The line type color CCD Sensor can only scan the data of one line in the main scanning
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.
Figure 2-3. Carriage Movement
The Carriage Unit slides along the guide rail in the sub scanning direction. To perform
this sliding operation, the CR (Carriage) Motor transmits its drive power to the Timing
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 2-4.)
Figure 2-4. Carriage Operation
Main
scanning
1 pixel
Document
Second line
First line
Scanner Head
(Carriage)
Sub scanning (by Carriage movement)