Epson 1640SU Service Manual
®
SERVICE MANUAL
SERVICE MANUAL
SERVICE MANUALSERVICE MANUAL
Color Image Scanner
EPSON Perfection 1640SU
1640SU PHOTO
1640SU OFFICE
SESC00-010
Notice:
All rights reserved. No part of this manual may be reproduced, stored in a retrieval system, or tran smi tted in any form or by any means,
electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of SEIKO EPSON CORPORATION.
The contents of this manual are subject to change witho ut notice.
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 above not withstanding SEIKO EPSON CORPORATION can assume no responsibility for any errors in this manual or the conse quences
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
respective owners. EPSON disclaims any and all rights in those marks.
Copyright © 2000 SEIKO EPSON CORPORATION. Printed in Japan.
PRECAUTIONS
Precautionary notations through out the text are categorized relative to 1)Personal injury and 2) damage to equipment.
W A R N I N G
The precautionary measures itemized below should always be observed when performing repair/maintenance procedures .
Signals a precaution which, if ignored, could result in serious or
fatal personal injury. Great caution should be exercised in
performing procedures preceded by a WARNING heading.
C A U T I O N
Signals a precaution which, if ignored, could result
in damage to equipment.
DANGER
1. ALWAYS DISCONNECT THE PRODUCT FROM THE POWER SOURCE AND PERIPHERAL DEVICES PERFORMING ANY MAINTENANCE
OR REPAIR PROCEDURES.
2. NOWORK 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.
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 ANTISTATIC WRIST STRAPS, WHEN ACCESSING INTERNAL COMPONENTS.
5. REPLACE MALFUNCTIONING COMPONENTS ONLY WITH THOSE COMPONENTS BY THE MANUFACTURE; INTRODUCTION OF
SECOND-SOURCE ICs OR OTHER NONAPPROVED COMPONENTS MAY DAMAGE THE PRODUCT AND VOID ANY APPLICABLE EPSON
WARRANTY.
PREFACE
This manual describes basic functions, theory of electrical and mechanical operations, maintenance and repair procedures of Perfection 1640SU,
Perfection 1640SU PHOTO and Perfection 1640SU OFFICE. The instructions and procedures included herein are intended for the experienced
repair technicians, and attent ion should be given to the precautions on the preceding page. The chapters are organi zed as follows:
CHAPTER 1. PRODUCT DESCRIPTIONS
Provides a general overview and specifications of the product.
CHAPTER 2. OPERATING PRINCIPLES
Describes the theory of electrical and mechanical operations of the product.
CHAPTER 3. TROUBLESHOOTING
Provides the step-by-step procedures for troubleshooting.
CHAPTER 4. DISASSEMBLY AND ASSEMBLY
Describes the step-by-step procedures for disassembling and assembling the
product.
CHAPTER 5. ADJUSTMENT
This product reqires no adjustment.
CHAPTER 6. MAINTENANCE
Provides preventive maintenance procedures.
APPENDIX
Provides the following addition information for reference:
- Connector Pin Assignments
- Parts lists
- Exploded Diagrams
Revision Status
Revision Issued Date
A August 9, 2000 First Release
Description
EPSON Perfection 1640SU Revision A
Contents
Chapter 1 Product Description
1.1 Features ................................................................................................... 9
1.2 Product Description ................................................................................ 10
1.3 Interface Specification............................................................................ 12
1.3.1 SCSI Interface............................................................................... 12
1.3.2 USB Interface................................................................................ 14
1.4 Control Code .......................................................................................... 15
1.5 Exterior Function .................................................................................... 16
1.5.1 Switch Specification ...................................................................... 16
1.5.2 Indicators....................................................................................... 16
1.6 Process when an error happens............................................................. 17
Chapter 2 Operating Principles
2.1 Engine Mechanism................................................................................. 19
2.1.1 Carriage Unit ................................................................................. 19
2.1.2 Carriage Move Mechanism ........................................................... 20
2.2 Power Supply Circuit .............................................................................. 21
2.3 Control Circuit......................................................................................... 23
2.3.1 Control Circuit Overview................................................................ 23
Chapter 3 Troubleshooting
3.1 Overview................................................................................................. 26
3.2 Self-Diagnostic Function......................................................................... 26
3.3 Troubleshooting...................................................................................... 27
Chapter 4 Disassembly and Assembly
4.1 Overview................................................................................................. 31
4.1.1 Precaution ..................................................................................... 31
4.1.2 Tools.............................................................................................. 31
4.1.3 Screws .......................................................................................... 31
4.2 Disassembly Procedures........................................................................ 33
4.2.1 Carriage Lock Release.................................................................. 33
4.2.2 Document Cover Removal............................................................ 34
4.2.3 Upper Cover Removal................................................................... 35
4.2.4 Panel Board Removal ................................................................... 37
4.2.5 Inverter Lamp/Inverter Board Removal......................................... 38
4.2.6 Main Board Removal..................................................................... 40
4.2.7 Carriage Unit Removal.................................................................. 42
4.2.8 Carriage Motor Removal ............................................................... 46
4.2.9 Sub Board Removal ...................................................................... 47
4.2.10 Power Supply Board Removal .................................................... 49
Chapter 5 adjustment
Chapter 6 Maintenance
6.1 Overview ................................................................................................ 54
6.1.1 Cleaning........................................................................................ 54
6.1.2 Lubrication..................................................................................... 54
Chapter 7 Appendix
7.1 Overview ................................................................................................ 56
7.1.1 Interconnection.............................................................................. 56
7.1.2 Connector Assignment.................................................................. 56
7.1.3 Connector...................................................................................... 57
7.2 Circuit Diagram....................................................................................... 59
7.3 Parts List & Exploded Diagram .............................................................. 61
7.4 TPU; Parts List ....................................................................................... 65
7.5 Exploded Diagram for TPU .................................................................... 66
7.6 Optional Part; ADF ................................................................................. 67
6
EPSON Perfection 1640SU Revision A
7.6.1 General Description....................................................................... 67
7.6.2 Specification.................................................................................. 67
7.6.3 Interface ........................................................................................ 69
7.7 ADF: Disassembly.................................................................................. 70
7.7.1 B81314 Main Board Removal ....................................................... 70
7.7.2 ASF Part........................................................................................ 71
7.7.3 Disassembling the ASF and Frame............................................... 76
7.8 Parts List of ADF .................................................................................... 78
7.9 ADF Exploded Diagram.......................................................................... 80
7
PRODUCT DESCRIPTION
CHAPTER
1
EPSON Perfection 1640SU Revision A
1.1 Features
EPSON Perfection 1640 consists of three models: 1640SU, 1640SU PHOTO
and 1640SU OFFICE. Major features are as follows. Perfection 1640SU
PHOTO has the TPU (transparency unit) as standard unit. Perfection 1640SU
OFFICE has the ADF (automatic document feeder) as standard unit.
MAJOR FEATURES
High quality:
Resolution: 1600 dpi (Optical resolution by 6 line CCD with
High speed:
Ease of Use
40800 pixels)
depth: 14 bit (14 bit-in, 14 bit-out)
Monochrome: 3.0 msec/line
Color: 8.7 msec/line
( Equivalent to ’Perfection 1200U/S’ )
Figure 1-1. Exterior View of Perfection 1640SU
EPSON Smart Panel
-Same functions as ’Stylus Scan 2000/2500’.
-Achieve easy scanning with a start button.
-Export a image data to applications easily.
Instant Photo Print Utility
Modify from ’Perfection 1200’
New Twain functions
-ITR(Image Type Recognition)
-Auto skew correction
Hybrid Interface
Include both USB and SCSI interfaces in one
Option
ADF(Based on ’Perfection 636 ADF’, and change external design
according to ’Perfection 1640SU’)
Film Adapter (Same sa ’Perfection 1200 Film Adapter’)
Product Description Features 9
EPSON Perfection 1640SU Revision A
1.2 Product Description
GENERAL SPECIFICATION
Product Type: Flatbed color image scanner
Sub-scanning method: Movement of the Scanner-Head
Photoelectric device: 6 line alternate color CCD
Maximum Read Area: 8.5 x 11.7 (216 x 297mm)
Maximum effective picture element:
13600 x 18720 pixels (1600 dpi)
Scanning Resolution:
Main 1600 dpi (Optical resolution by 6 line CCD with 40800 pixels)
Sub 3200 dpi with Micro Step
Output resolution: 50 ∼ 6400 dpi (1 dpi step)
(12800dpi scanning is achieved by
6400dpi x 200%)
Gray scale levels: 14 bits/pixel (Input 14 bits/pixel, Output 1-8/bits/
pixel)
Color Separation: By the color filter of CCD
Zoom: 50 ∼ 200% (1% step)
Scanning Speed:
Color: 8.7 msec/line
Monochrome (bi-level): 3.0 msec/line
Command level: ESC/I (B8), FS
Gamma Correction: CRT 2 level (A, B)
PRINTER 3 level (A, B, C)
User defined 1 level
Color Correction: Impact-Dot Printer
Thermal Printer
Ink-Jet Printer
CRT Display
User defined
Brightness: 7 levels
Line Art: Fixed threshold
TET (Text Enhancement Technology)
Digital halftoning: AAS
Error Diffusion 3 modes (A, B, C)
(Bi-level, Quad-level)Dither (Resident) 4 modes (A, B, C, D)
Dither (User defined) 2 modes (A, B)
Interface (Resident):SCSI (50-pin Half pitch Connectors) x 1pcs
USB (Type-B Receptacle Connector) x 1pc
USB Hosts: All of USB ports work correctly. (The functionality of
the USB port (s) must be ensured by the vendor of the
Host)
Number of Hub: This device must be in the Tier 1 or 2 with
recommended USB cable. (Tier1:Host-this device
Tier2: Host-Hub-this device)
Light Source: White Cold cathode Fluorescent Lamp
Option : ADF, Film Adapter
Start button: Ease of use with EPSON Smart Panel
Operating System:
SCSI I/F: Microsoft Windows 95/98, Windows NT4.0/Windows2000
Microsoft Windows Millennium Edition
Macintosh System 8.0 or later
USB I/F: Microsoft Windows 98 (Pre-install model)
Microsoft Windo w s2 000 (Pre-install mo de l or up gr ad e
model from Windows 98 pre-install model)
Microsoft Windows Millennium Edition (Pre-install model
or upgrade mo del from Window s 98 pre-install mode l)
Apple System 8.1 or later (USB equipped model)
Product Description Product Description 10
EPSON Perfection 1640SU Revision A
ELECTRICAL SPECIFICATIONS
Rated voltage: AC100-120V
AC220-240V
Input voltage: AC 100 -120V ±10%
AC 220 - 240V ±
Rated Current : 0.5A (Input AC100V)
0.3A (Input AC200V)
Rated Frequency Range:50-60 Hz
Input Frequency Range:49.5-60.5 Hz
Power consumption: Approx. 25W (Operating)
Approx. 10W (Stand-by)
Insulation resistance: 10 MΩ at 500VDC (between AC line and chassis)
Dielectric strength: AC.1.2kV, 1 min (between AC line and chassis)
10%
SAFETY, EMC, EPA
Safety: UL 1950 (UL)
CSA C22.2 NO.950 (CSA)
EN60950 (VDE)
IEC950 (ROSTEST, PSB)
EMC: FCC Part15 Subpart B Class B
CSA C108.8 Class B
AS/NZS3548 Class B
CISPR Pub22 Class B
CNS 1348 Class B
RESISTANCE TO ELECTRIC NOISE
Static electricity: panel - 10 kV
metal - 7kV/150 pF, 150Ω
ENVIRONMENTAL CONDITIONS
Temperature:
Operating: 5 °C to 35 °C
Storage: -25 °C to 60 °C
Humidity:
Operating: 10 to 80%, no condensation
Storage: 10 to 85%, no condensation
RELIABILITY
MCBF: 30, 000 cycle
OPERATING CONDITIONS
Dust: Ordinary office or home conditions. Extreme dust
should be avoided.
Illumination: Operation under direct sunlight or near strong light
source is not guaranteed and should be avoided.
DOCUMENT
CE Marking:
Low Voltage Directive 73/23/EEC EN60950
EMC Directive 89/336/EEC EN55022 Class B
EN6100-3-2
EN6100-3-3
EN50082-1
IEC60801-2/801-3/801-4
EPA: Energy Star Program
Reflective type: Documents which has a smooth surface such as a
printing and photograph.
Transparency type (with transparency unit)
Reversal film
Negative film
Product Description Product Description 11
EPSON Perfection 1640SU Revision A
PHYSICAL DIMENSIONS AND WEIGHT
Dimensions: 289(W) x 442(D) x 96(H) mm
Weight: Approx. 4.5 Kg
442mm
1.3 Interface Specification
1.3.1 SCSI Interface
Basic specifications
Any items not included in this specification shall be in compliance with
ANSI X 3T9.2/375R Revision 10L (SCSI 2)
Function
The following functions are available, which are included in ANSI X3T9.2/
375R Revision 10L (SCSI 2)
Table 1-1. SCSI Interface Function
Function Note
Bus Free Phase
Arbitration phase
Selection /Re-selection phase
The LUN (Logical Unit Number) is
Command phase
Data in phase
fixed at “0” in this device. The
Command Link Function is not
supported.
Data out phase
Status phase
Message in phase
96mm
289mm
Figure 1-2. Size
Message out phase
Attention condition
Reset condition
SCAM (SCSI Configured Auto Magically specification) [X3T9.2/93109r5]
Electric specification
Compliant to ANSI X3T9.2/375R Revision 10L (SCSI 2)
Single ended
Product Description Interface Specification 12
EPSON Perfection 1640SU Revision A
Connector: Two 50-pin connectors
Terminator: Internal terminator
(always ON ----terminator available)
SCSI ID: The SCSI ID is set with a rotary switch on the rear panel.
The switch numbers are corresponded to the available
address and can be set from 0 to 7.
Others are reserved
Factory setting ID=2
Table 1-2. SCSI Connector Pin Assignment
Signal I/O Pin No. Specification
1 ∼12
GND
NC 13
DB0 I/O 26 Data Bus 0
DB1 I/O 27 Data Bus 1
DB2 I/O 28 Data Bus 2
14 ∼ 25
35 ∼ 37
39, 40, 42
50pin connector
Figure 1-3. SCSI Connector Pin Assignment
DB3 I/O 29 Data Bus 3
DB4 I/O 30 Data Bus 4
DB5 I/O 31 Data Bus 5
DB6 I/O 32 Data Bus 6
DB7 I/O 33 Data Bus 7
DBP I/O 34 Data Bus Parity
TERMPWR 38 Terminator Power
ATN I 41 Attention
BSY I/O 43 Busy
ACK I 44 Acknowledge
RST I 45 Reset
MSG O 46 Message
SEL I/O 47 Select
C/D O 48 Command/Data
REQ O 49 Request
I/O O 50 Input/Output
Product Description Interface Specification 13
EPSON Perfection 1640SU Revision A
1.3.2 USB Interface
Component: This device supports the following configurations.
Table 1-3. Configurations
Class: Vender-specific
Max. packet size of endpoint 0: 64 byte
Device
Component
Interface 0
End point 1
End point 2
Vender ID: 0x04B8
Product ID: 0x010A
No.of component: 1
Supported Interface: 1
Characteristic
• Self power
• Remote wake up function support
Power consumption:2mA
substitutes setting value: NO
Endpoint: 2
Class: Vender-specific
Bulk IN transfer
Max. packet size: 64 byte
Bulk out transfer
Max. packet size: 64 byte
Figure 1-4. Receptacle (Series B)
Table 1-4. Connector Pin Assignment
Pin No. Signal
1VCC
2 - Data
3+ Data
String descriptor
Electric specification: Compliant to the high speed (12M bps) mode of
Producer: “EPSON”
Product Name: Perfection 1640
4 GND
Universal Serial Bus Specification Rev.1.1.
Connector: Receptacle (Series B) (Figure 1-4 and Table1-4)
Product Description Interface Specification 14
EPSON Perfection 1640SU Revision A
1.4 Control Code
The command level is ESC/I-B7 and supported commands are shown below.
Table 1-5. Control Codes
Category Command Name Code
ID request ESC I
Status request ESC F
Extension status request ESC f
Status setting request ESC S
Execute Command
Data format
setting
Read start command ESC G
Push Button Status request ESC !
Expansion ID request FS I
Scanner Status request FS F
Read parameter request FS S
New read start FS G
Sets Data format ESC D i
Sets resolution rate ESC R n1 n2
Sets zoom rate ESC H i1 i2
Sets the reading range ESC A n1 n2 n3 n4
Sets the color ESC C i
Mirroring ESC K i
Sets reading parameter FS W
Table 1-6. Control Codes
Category Command Name Code
Set Digital Halftoning ESC B i
Set Auto Area Segmentation ESC s i
Download Dither Pattern ESC b ijd (j2)
Image process
Color correction ESC M i
Download Color Correction ESC m df d2...d9
Set Threshold ESC t i
Set scanning mode ESC g i
Initialize ESC @
Set line counter ESC d i
Control option ESC e i
Auxiliary
Focus adjustment ESC p i
Focus position status request ESC q
Eject paper FF
Film type ESC N i
Normal response ACK
Abnormal response NACK
Control
Abort scanning CAN
Header STX
Set brightness ESC L i
Correction process
Set Gamma correction ESC Z i
Set Gamma correction table ESC z i d0 d1...d255
Set sharpness ESC Q i
Product Description Control Code 15
EPSON Perfection 1640SU Revision A
1.5 Exterior Function
1.5.1 Switch Specification
OPERATE Switch
Turns the scanner ON/OFF
Pressing this switch at power ON initializes the scanner
PUSH Button
The status of this button can be checked by [ESC !].
SCSI ID switch (rotary type)
0 - 7: SCSI ID (Factory setting ID=2)
Other: Reserved
1.5.2 Indicators
Indicator display
OPERATE (Green LED)
OPERATE switch is ON and power is ON.
READY (Green LED)
*This lamp becomes ON when the command or receiving/sending the
data is available. (During scanning, READY lamp repeats blinking,
according to the data transfer)
*READY lamp blinks with with ERROR LED when an error occurs.
ERROR (Red LED)
This lamp blinks when an error (s) is detected.
READY LED
(green)
ON ON Command error
OFF Blink
OFF Blink Fatal error
Blink Blink Option error
Table 1-7. Error Indication
ERROR LED (red) Error ty pe
Communication
error
Product Description Exterior Function 16
EPSON Perfection 1640SU Revision A
Remedy: Turn the scanner off and then back on. Send ESC@
1.6 Process when an error happens
Command error
Cause: Unidentified command or unidentified command
parameter is detected.
Disposition: The scanner ignores the wrong command or parameter.
(Therefore, the current setting or the default value remain
effective.)
Scanner sends NACK, and waits for the next command or
parameter.
Indicator: Red LED ON
Remedy: The error condition is cleared when the scanner receives
a correct command.
Interface error (Communication error)
Cause: Wrong procedure is detected in the interface
communication. In the case of SCSI, a transmission is
frozen more than 30 seconds except BUS FREE phase.
Disposition:The lamp goes off and the scanner stops operation.
code to the scanner. RESET signal in SCSI turns active.
Complete BUS DEVICE RESET message in SCSI.
Acceptable command: ESC F, ESC f, ESC @
Option error:
This error occurs by the following causes, when an optional unit is installed
and its operation is available by the optional control command (ESC e).
Cause: Unit cover open
Paper Empty
Disposition:The bit 7 of the status byte is set to “1”
Indicator: READY LED Blink
ERROR LED Blink
Remedy: Remove the error condition
Acceptable command: ESC F, ESC f, ESC @
Indicator: READY LED Off
ERROR LED (red) blinking (short interval)
Remedy: Turn the scanner off and then back on. RST signal in SCSI
turns active.
Acceptable command : Nothing
Fatal error
Cause: The lamp is broken. Power is turned on before removing
the transportation screw.
Disposition: The lamp goes off and the scanner stops operation.
The bit 7 of the status byte is set.
Indicator: READY LED Off
ERROR LED Blinks
Product Description Process when an error happens 17
OPERATING PRINCIPLES
CHAPTER
2
EPSON Perfection 1640SU Revision A
CCD Sensor Board: This board has Color CCD line sensor
2.1 Engine Mechanism
This section explains the engine function and operating principles. Engine can
be divided into Carriage Unit and Carriage Move Mechanism.
2.1.1 Carriage Unit
Carriage unit is mainly composed of CCD sensor board, Inverter board, Lamp
(light source), Mirror and Lens mechanism.
Rear
Lamp
CCD Sensor
Front
Board
CCD Sensor
(independent R,G,B), and controls it and drives
circuit.
Inverter Board: This board generates voltage to drive the lamp
by pressuring up to the +24VDC and converting it
from direct current to alternating current.
Lamp: White cold fluorescent Lamp is used as light
source. When the light quantity is not stable,
the scanner blinks the Operate light until the
light becomes stable and goes to stand-by mode.
Mirror and Lens Mechanism:The light emitted to the document
reaches the CCD sensor after being
reflected on some mirrors one after
another. Not by changing the light
source to create R/G/B light component
which can be found in the previous
models, Color CCD itself creates each
R/G/B light component.
CCD Sensor
Mirror3
Board
B(main)
B(sub)
G(main)
G(sub)
R(main)
R(sub)
Inverter Board
Mirror2
Mirror4
Front
Scanned image
Document
Rear
Lamp
Figure 2-1. Carriage Unit Component
Mirror5
Mirror1
Lens
CCD Sensor
Figure 2-2. Mirror, Lens Mechanism
Operating Principles Engine Mechanism 19
EPSON Perfection 1640SU Revision A
n
2.1.2 Carriage Move Mechanism
Scanning image is performed in the main scan direction (=1 line) by the CCD
sensor and in the sub-scan direction (=several lines) combined with carriage
unit movement. (See the figure below)
Line type, color CCD sensor can scan 1 line in main scan direction (parallel to
the carriage unit) by one time. When scanning next lines after the second line
in sub-scan direction, CR driving moves the carriage unit, which has CCD
sensor inside, and scan the other lines. The scanned data is sent to the control
board. The scanned data for “n” lines and “n-1” line are processed
consecutively.
Second
1 pixel
Document
Main Scan
Direction
Sub-scan Direction by
CR Movement
Line
First Line
Scanner Head
(Carriage)
Carriage Unit slides into sub-scan direction along with the guide rail. For this
sliding operation, the carriage motor drives the timing belt attached to the
carriage unit by conveying the driving force through the drive pulley and
reduction gear. Scanning start position is determined by CR HP sensor, which
is located on the control board. Since the stepping motor is used for CR motor,
carriage home position is controlled under the open loop system. (See the
figure below)
Rear
Carriage Unit
CR HP
Sensor
Front
Timing Belt
Drive Pulley
Drive Pulley
CR Motor
Reductio
Gear
Figure 2-3. Carriage Movement
Figure 2-4. Carriage Operation
Operating Principles Engine Mechanism 20
EPSON Perfection 1640SU Revision A
2.2 Power Supply Circuit
Power supply circuit in this scanner generates direct current DC power
necessary for driving the controller board and scanner engine. Table below
shows each power supply circuit for different destinations.
Table 2-1. Power Supply Circuit Board for Destination
Specification Unit Part No. Fuse
100-120 VAC Range 2031592 2.5 A/125 VAC
220-240 VAC Range 2031593 T2.5AH/250 VAC
Figure 2-5 shows diagram of power supply circuit.
Output from the power supply circuit is performed by closing or opening the No.
4 pin of CN102 connector. When opening, as it is shown in the Table below,
each output voltage becomes active. Also, each output voltage has over
current protection and over voltage protection circuit.
Table 2-2. Output and Protection Function
Output
Voltage
5 VDC 1.2A
12 VDC 0.2A
24 VDC 0.7A
Output
Current
Over Current Protection
(Current value to activate)
Fold-back characteri st ic.
Automatic Recove ry. (Less
than 1A)
Constant current limiting.
Automatic Recovery.
(less than 0.5 A)
Shut down. Turn off the
power and back on to
recover.
Over voltage Protection
(Voltage value to activate)
Shut down. Turn off the
power and back on to
recover. (5.5 -7.5 VDC)
Shut down. Turn off the
power and back on to
recover. (14 -17 VDC)
Shut down. Turn off the
power and back on to
recover. (28 -33 VDC)
NOTE: 1. If a part of output is shut down, all the other output are also shut
down.
2. Off time required to recover is maximum 5 minutes.
Operating Principles Power Supply Circuit 21
EPSON Perfection 1640SU Revision A
F u l l W a v e
R e c t i f i e r C i r c u i t
F i l t e r C i r c u i t
A C V o l t g e I n p u t
S m o o t h i n g
C i r c u i t
S w i t c h i n g
C i r c u i t
S m o o t h i n g
C i r c u i t
+ 1 2 V D C
R e g u l a t o r I C
+ 5 V D C
R e g u l a t o r
C i r c u i t
O v e r C u r r e n t
P r o t e c t i o n
C i r c u i t
S m o o t h i n g
C i r c u i t
+ 2 4 V D C
C o n t r o l C i r c u i t
+ 2 4 V D C O v e r
C u r r e n t P r o t e c t i o n C i r c u i t
+ 5 / + 1 2 / + 2 4 V D C
O v e r V o l t a g e
P r o t e c t i o n C i r c u i t
+ 1 2 V D C
+ 5 V D C
+ 2 4 V D C
P o w e r S u p p l y
S W C i r c u i t
P o w e r S W
( P W - S W )
Figure 2-5. Power Supply Circuit Block Diagram
Operating Principles Power Supply Circuit 22
EPSON Perfection 1640SU Revision A
2.3 Control Circuit
Table 2-3. Major ICs
2.3.1 Control Circuit Overview
This scanner uses the one-tip 16-bit bus CPU (IC9) at 20MHz frequency.
Image data processing, correction, CCD sensor board, A/D converter control
are operated at ASIC (IC3). Table 2-3 shows major IC functions.
H8S/2350 IC9
E02A34EB IC3
MB81F641642D IC8 SDRAM 64Mbit
IS61C256AH IC4, IC6
A3957SLB IC1, 2 CR motor driver IC
MBM28F200B IC5 PROM
BH9596FP-Y IC14 Terminator IC
IC Location Function
CPU
24-bit Address Bus
16-bit Data Bus
ASIC
• CCD Control
• Line (sharpness) Control
• Image Processing
• Memory Control
SRAM 32k x 8 bit
SPC7215F0A IC18 SCSI/USB Controller
SSA20.00BR CR2 2 0 MHz clock for CPU
Operating Principles Control Circuit 23
EPSON Perfection 1640SU Revision A
CCD Board
Lamp
&
Inverter Board
Image Data
(R/G/B)
+5V
CR
Motor
CR Motor
Driver
(IC1,2)
SRAM
(IC6)
E02A34EB (IC3)
CPU (IC9)
H.P.
SDRAM
(IC8)
ID SW
SCSI/USB Controller
CLK(CR2)
(IC18)
PROM
(IC5 )
Terminator IC
(IC14)
SRAM
(IC
4
)
SCSI
USB
LV1
(+3.3V)
Regulator
(IC10)
Figure 2-6. Control Circuit Block Diagram
Operating Principles Control Circuit 24
TROUBLESHOOTING
CHAPTER
3
EPSON Perfection 1640SU Revision A
3.1 Overview
This chapter explains the troubleshooting of this scanner.
3.2 Self-Diagnostic Function
The self-diagnostic function of this scanner lets the scanner to check the
condition of each component automatically. If it detects a faulty component, it
indicates the status using the Operate light. See Table3-1.
Table 3-1. Self-Diagnostic Indication
LED Light Error Type (Cause, Remedy)
Green Red
Command Error
• Cause: Unidentified command or unidentified command
parameter is detected.
• Disposition: The scanner ignores the wrong command or
OFF ON
OFF Blink
OFF Blink
Blink Blink
parameter. (Therefore, the current settings or the default
value remain effective) Scanner sends NACK, and waits
next command or parameter.
• Remedy: The error condition is cleared when the scanner
received a correct command.
Interface Error
• Wrong pr ocedure is detected in the interfa c e
communication. In the case of SCSI, a transmission is
frozen more than 30 seconds except BUS FREE phase.
• Disposition: The lamp goes off and the scanner stops
operation.
• Turn off the scanner and then b ack on. RST si gnal in SCS I
turns active.
• Acceptable command: Nothing
Fatal Error
• Cause: The lamp is broken. Power is turned on before
removing the transportation screw. System break down.
• Disposition: The lamp goes off and the scanner stops
operation. The bit 7 of the status is set.
• Remedy: Turn the scanner off and then back on. Send
ESC@ codes to the scanner. RESET signal in SCSI turns
active. Complete BUS DEVICE RESET message in SCSI.
• Acceptable command: [ESC F, ESC f, ESC @]
Option Error
(Only when the optional unit is installed and operation is
available by [ESC e].)
• Cause: Unit cover open, or paper Empty
• Disposition: The bit 7 of the status byte is set to “1”.
• Remedy:Remove the error condition.
• Acceptable command:[ESC F, ESC f, ESC @]
Troubleshooting Overview 26
Loading...