UMAX Data Systems Astra 1220U Manual de usuario
Astra 1220U
Color Scanner
Service Manual
UMAX Data Systems, Inc.
0898-e
Trademarks
Astra 1220U is a registered trademark of UMAX Data Systems, Inc.
Copyright
Copyright 1998 UMAX Data Systems, Inc. All Rights Reserved. No part of this publication may be
reproduced, transmitted, transcribed, stored in a retrieval system, or translated into any language or
computer language, in any form or by any means, electronic, mechanical, magnetic, optical, chemical,
manual, or otherwise, without the prior written permission of UMAX Data Systems, Inc.
Observe the Following Safety Precautions:
1. Make sure that the scanner is turned off and disconnected from both the power source and computer
before working on it.
2. Anyone who performs any maintenance on the scanner must be familiar with the basic safety
precautions required when working on electronic devices.
3. Observe any and all procedural steps described in this service manual, in the order that they are
presented, especially those which involve applying power to the scanner or its components. If and
when the scanner must be connected to a power source, while maintenance or testing is performed, use
extreme caution when working on scanner electronic components.
4. Only replacement parts approved by UMAX should be used in repairing the scanner to ensure safe and
reliable scanner performance and to avoid losing warranty protection.
5. Take all precautions against static electricity damaging electronic components.
6. Check to make sure that the power source has the same voltage rating as that required for operating the
scanner.
7. Whenever it is necessary to remove or replace electronic components, always check to make sure the
scanner is disconnected from its power source.
About This Manual
This manual is designed for trained service personnel. All service operations mentioned in this manual are
to be carried out by UMAX certified repair technicians only.
This manual contains basic after sales service information that is vital to the maintenance of a high quality
and reliable scanner. For specific scanner operating procedures, please refer to the operation manual.
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Contents
1. Introduction.........................................................................................1
The Astra 1220U..........................................................................................................1
Scanner Specifications................................................................................................1
2. Electronic Systems.............................................................................3
Astra 1220U Electronic Systems.................................................................................3
The Opto-Mechanical ..................................................................................................4
Function Block Diagram ..............................................................................................5
VIDEO Test Timing Diagram (Pixel)............................................................................6
VIDEO Test Timing Diagram (Line).............................................................................6
CCD Test Timing.........................................................................................................7
Component Connectors...............................................................................................8
3. Component Assemblies ....................................................................16
Component Assembly Overview ...............................................................................16
Component Replacement Kits...................................................................................16
Astra 1220U Main Components ................................................................................21
4. Troubleshooting Guide.....................................................................28
Maintenance Notice...................................................................................................28
Cleaning and Repair Suggestions.............................................................................28
5. Environment vs. Performance .........................................................29
Overview....................................................................................................................29
Shock and Vibration...................................................................................................29
Temperature..............................................................................................................29
Humidity.....................................................................................................................30
Dust............................................................................................................................30
Aging..........................................................................................................................30
Appendix A.............................................................................................31
Board Outline Diagrams ............................................................................................31
Appendix B.............................................................................................33
Scanner Outline Diagram..........................................................................................33
Appendix C.............................................................................................34
Component Replacement Kits for UTA-3A................................................................34
Transparency Adapter Main Components.................................................................37
Main Components and Outline Diagram...................................................................43
iii
Pin Assignment..........................................................................................................44
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Service Manual
1. Introduction
What’s in this Chapter:
•The Astra 1220U
•Specifications
The Astra 1220U
The Astra 1220U Flatbed Scanner is a highly reliable, high quality product which is designed to give long
term service. However, like all opto-electronic products, occasional routine maintenance may be required
for certain scanner components. This service manual is provided so that qualified maintenance and repair
technicians can perform service as needed.
Scanner Specifications
Scanner Type: .......................................... Flatbed
Preview Speed: ........................................ 31.6 seconds/A4 size (Color Mode)
21.1 seconds/A4 size (Gray/Lineart Mode)
Maximum Scannable Area: ..................... 8.5 x 11.7 inches
Optical Resolution: .................................. 600 x 1200 dpi
Maximum Resolution: ............................. 9600 x 9600 dpi
Warm Up Time: ..........................……….. 30 sec.
Color Scanning Method: ......................... One pass with color CCD
Sample Depth
Color Mode: ..................................... 30 Bits/Pixel Internal
Grayscale Mode: .............................. 10 Bits/Pixel Internal
Line-Art Mode: ................................. 1 Bit/Pixel
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Service Manual
Scanner Settings
Scaling: ............................................. 1% to 200% in 1% increments at 600 dpi Resolution
Highlight/Shadow: ........................... 255 steps
Brightness: ....................................... -100% ~ 100%
Gamma Curve: ................................. Downloadable Curves
Data Output
Color Mode: ...................................... 30 Bits (Hardware) 36 Bits (System)
Grayscale Mode: .............................. 10 Bits (Hardware) 12 Bits (System)
Interface: .................................................. USB
Power Requirements
Voltage: ............................................. DC12 V (AC)
Power Consumption: .............................. Maximum 12 Watts
Environmental Ranges
Operating Temperature: .................. 10° C ~ 35° C
Relative Humidity: ........................... 10% ~ 85%
Dimensions: ............................................. 471mm x 312mm x 98mm
Net Weight: ............................................... 3.65 Kg
Systems Supported: PC
*Product Specifications subject to change without notice.
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Service Manual
2. Electronic Systems
What’s in this Chapter:
•Astra 1220U Electronic Systems
•The Opto-Mechanical System
•The Photo-Electrical Converter
•The Analog to Digital Converter
•The Host Computer Interface
•Function Blocks
•Test Timing Diagrams
•Connectors
•CCD Pin Assignment
Astra 1220U Electronic Systems
The Astra 1220U consists of several electronic component systems which work together when a document
is scanned. The systems and their functions are described as follows (see Fig. 2-1 below).
A scanning lamp to illuminate the document.
An optical system that uses mirrors and lenses (the optical system) to focus the reflected light from the
surface of the document onto a Charged Coupled Device (CCD).
A mechanical system that uses a stepping motor attached to a gear assembly. The gear assembly drives
a timing belt to move the optical assembly (carriage) when scanning.
A photo-electrical conversion system, using a CCD which produces a string of analog electrical signals
representing a straight line image of a document.
An image processing system that converts the analog signals from the CCD into digital signals.
An interface board to connect the control signals of control circuit to image processing unit, the optical
system and transmission subsystem.
Object Glass
Lamp
Image Processing
Circuit
Optical
Subsystem
Photo Sensor
CCD
Control
Circuit
Host Computer
Transmission
Subsystem
Fig. 2-1: Scanner Systems
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Service Manual
The Opto-Mechanical
The opto-mechanical system consists of the following (see Fig. 2-2 below):
Three mirrors to guide the optical path from the document being scanned to the image sensor.
One lense to focus and reduce the size of the image.
Resolution of Lens is 600dpi.
A support chassis for the mounting of mirrors, lens mount, and CCD.
A stepping motor, gear train, and timing belt to move the optical system.
Note: Please be sure to keep all dirt, dust, moisture, and oil away from the optical system. Any small spot
in the optical system will adversely affect the image quality.
Fig. 2-2: The Opto-Mechanical System
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Service Manual
Function Block Diagram
The following diagram reveals the functions of the scanner's main board.
CCD connector
LED
connector
MOTOR connector
POWER
JACK
ULN2003
Resistance
Gain
LM9811
DRAM
UTA connector
VIDE
O
DD0_7
LED_
N
RA0_8 RD0_7
NS_RS,NS_PH1,NS_PH2
(128,256K)
A,B,/A,/B
U_HOME,DETECT
U_A,B,/A,/B
MCLK
J1
J2
J3
J4
J7
M/B System Block Diagram
7805
+5V
+12V
R1,R2
TGI,SEL1,SEL2
U2
U4
Q4
U5
ASTRA 1220P
ASIC
S_CTR1_3
S_STATUS0_4
DA0_7
U1
74HC04
U6
CCD Processer
Data Storage
Motor Driver
Regulator
Scanner Function
EMI Reduce
ASTRA 1220U page 3
XTAL
24MHz
OSC
48MHz
U3
U4
X1
X2
U S B
PV8630 USB
Connector
D+
D -
93C46
Vendor ID
Fig. 2-3: System Block Diagram
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Service Manual
VIDEO Test Timing Diagram (Pixel)
The following diagram shows the Video test pin signal during a scan while in color mode.
VIDEO Test Timing Diagram (Line)
The following diagram shows the VIDEO test timing diagram during a scan while in color mode:
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Tabla de contenidos
