Avision AV25 User manual

AVISION
AV25
Image Scanner
User's Manual
Version 1.0
(Doc. No. 250-0053-0)
Avision Inc. 1996

ii
Trademarks
Microsoft is a U.S. registered trademark of Microsoft Corporation.
Windows and MS-DOS are trademarks of Microsoft Corporation.
IBM, PC, AT, XT are registered trademarks of International
Business Machines Corp.
Other brands and product names herein are trademarks or
registered trademarks of their respective holders.
Copyright
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 Avision Inc.
Material scanned by this product may be protected by
governmental laws and other regulations, such as copyright laws,
the customer is solely responsible for complying with all such
laws and regulations.

iii
Warranty
The information contained in this document is subject to change
without notice.
Avision makes no warranty of any kind with regard to this
material, including, but not limited to, the implied warranties of
fitness for a particular purpose.
Avision shall not be liable for errors contained herein or for
incidental or consequential damages in connection with the
furnishing, performance, or use of this material.

iv
FCC Radio Frequency Interference Statement
This equipment has been tested and found to comply with the
limits for a class B digital device, pursuant to Part 15 of the
FCC rules. These limits are designed to provide reasonable
protection against harmful interference in a residential
installation. This equipment generates, uses, and can radiate
radio frequency energy and, if not installed and used in
accordance with the instruction manual, may cause harmful
interference to radio communication. However, there is no
guarantee that interference will not occur in a particular
installation. If this equipment does cause harmful interference
to radio or television reception, which can be determined by
turning the equipment off and on, the user is encouraged to
try to correct the interference by one or more of the following
measures:
* Reorient or relocate the receiving antenna.
* Increase the separation between the equipment and receiver.
* Connect the equipment into an outlet on a circuit different from
that to which the receiver is connected.
* Consult the dealer or an experienced radio/TV technician for
help.
CAUTION: Any changes or modifications not expressly
approved by the manufacture of this device could void the user's
authority to operate the equipment.

v
Table of Contents
CHAPTER 1 INTRODUCTION...........................................................1-1
CHAPTER 2 SCANNER INSTALLATION.........................................2-1
2.1 INSTALLATION OF THE SCANNER...................................................... 2-1
2-2 CONNECTING THE CABLE................................................................ 2-2
CHAPTER 3 SCANNER DRIVER INSTALLATION.........................3-1
3-1 AUTO-INSTALLATION PROGRAM...................................................... 3-1
3-2 UNINSTALL THE SCANNER............................................................... 3-3
CHAPTER4 SCANNER OPERATION......................................................4-1
4-1 IMAGE TYPE ................................................................................... 4-3
4-2 SCANNING PARAMETERS & IMAGE CONTROL................................... 4-4
4-3 SCANNING...................................................................................... 4-7
CHAPTER 5 TROUBLESHOOTING..................................................5-1
5-1 QUESTIONS AND ANSWERS.............................................................. 5-2
5-2 TECHNICAL SERVICE....................................................................... 5-5
CHAPTER 6 SPECIFICATIONS.........................................................6-1
6-1 MODEL: AV25............................................................................... 6-2

1-1
Chapter 1 Introduction
Congratulations on your purchase of Avision AV25 image
scanner. Avision Inc. is one of the leading companies in the
world to develop high performance sheet-fed scanners.
Before you install and operate the new scanner, please take a few
minutes to read through this manual. It provides you with the
proper instructions on how to unpack, install, operate and
maintain the scanner.
Figure 1-1 shows how the scanner is packed. Please check all
the items against your checklist. If you did not receive all the
items, please contact your authorized local dealer immediately.

1-2
Figure 1-1 Scanner packing

2-1
Chapter 2 Scanner Installation
Precautions
* Keep the scanner out of direct sunlight. Direct exposure to the
sun or excessive heat may cause damage to the unit.
* Do not install the scanner in a humid or dusty place.
* Be sure to use the proper AC power source.
* Place the scanner securely on a level surface. Tilted or uneven
surfaces may cause mechanical or paper-feeding problems.
*Retain the scanner box and packing materials for shipping
purposes.
2.1 Installation of the Scanner
Please unpack the packing carefully, and check the contents
against the checklist. If any items are missing or damaged,
please contact your dealer immediately.

2-2
2-2 Connecting the Cable
Be sure the scanner is power off.
Connect the power cable and signal cable as shown below.
Figure 2-1 AV25 scanner cable connection

2-3
Document loading
Load the documents one page at a time. And put the document to
be scanned face down in the scanner.
Figure 2-2 Put document in the scanner.

3-1
Chapter 3 Scanner Driver Installation
Minimum Requirements:
* IBM compatible PC 386/486 or Pentium;
* Microsoft Windows 3.1 or Windows 95;
* DOS 5.0 or higher;
* One printer port available (enhanced parallel port
recommended);
* 2 megabytes of available hard disk space for installation;
* 4 megabytes of RAM (8 megabytes or higher recommended);
* A video graphics array (VGA) monitor;
* A Microsoft Windows-compatible pointing device, e.g., the
mouse;
* A CD ROM drive.
3-1 Auto-Installation Program
Installation procedure of the scanner driver with Avision Auto-
Installation Program is as follows:
1. Start Windows 3.1 or Windows 95.
2. Insert AV25 CD kit into your CD ROM drive.
For Windows 3.1 or Windows 3.11 (See Figure 3-1,3-2)
3. From the File Menu, choose RUN, type
d:\driver\av25\setup.exe, and then click O.K.

3-2
For Windows 95
3. Press the Start button, choose RUN, type
d:\driver\av25\setup.exe, and then click O.K.
4. Follow the instructions on the screen to complete the
installation (usually just clicking O.K. will complete the
installation).
Fig. 3.1
Fig. 3.2

3-3
3-2 Uninstall the Scanner
You can uninstall the scanner by double-clicking on the Uninstall
icon stored in the AV25 Driver group.
...

4-1
Chapter4 Scanner Operation
There are two types of application software interface to use with
the AV25 scanner. They are TWAIN and ISIS. TWAIN is the
most popular interface among image-editing application
software, while ISIS is most popular among archiving application
software (OCR).
Scanning Images from within an Application (TWAIN)
1. Open your application and choose Select Source from the
File menu. If the Select Sourcemenu options are not
available from the File menu, see the user guide of your
application to learn how the TWAIN link is used.
2. A dialog box appears containing the different TWAIN
sources you can choose for bringing an image into your
application.
3. Select AV25/16 V3.2 as the source.
4. You need to select AV25 for just once except when you
have used the dialog box to select a different source. In
that case, you will need to select AV25 as the source again
before you can reuse the scanner.
5. Do calibration: Place a sheet of A4-size white paper in the
scanner and press the Calibration button to calibrate
“whiteness” for the scanner.

4-2
6. Place the image to be scanned face down on the scanner.
7. From the File menu, select Acquire.
8. Avision TWAIN user interface will pop up on the
screen. Click on the Prescan or Scan button to get the
image.
Avision TWAIN user interface:

4-3
4-1 Image Type
As shown below, you can select the mode you want to use with
your document or image. Just click on the corresponding button.
Line art
Error Diffusion Halftone
Gray Scale
Line art
Line art includes only black and white areas.
There are no intermediate shades of gray in
between.
Error Diffusion
While taking up but a minimum storage space,
error diffusion gives good image texture and
excellent image details.
Halftone
Halftone simulates different shades of gray by
varying the threshold value of a matrix.
Gray (256 levels gray scale)
Scanner recognizes each point in the image as a
shade of gray (continuous tone). 8-bit gray gives
more detailed information about the image.

4-4
4-2 Scanning Parameters & Image Control
Resolution: The number of dpi (dots per inch) that AV25 uses
for a scan.
Brightness: Adjusts the lightness or darkness of an image.
The higher the value, the brighter the image.
Contrast: Adjusts the range between the darkest and the
lightest shades in the image. The higher the
contrast, the bigger the different gray scales.
Brightness
Adjustment
Resolution
Control
Contrast
Adjustment

4-5
Auto Level Auto Area
Descreen
Reset
Image Information
Auto Level: Optimizes the scanned image.
Auto Area: Automatically sets the whole document as the
scan area, no matter what its size.
Descreen: Eliminates the Moire patterns commonly found in
printed matter.
Before descreen After descreen
Pixel/Inch/Cm
Quality Mode
Speed Mode
Invert
Calibration
Set Gamma

4-6
Reset: Resets the scanning parameters you set.
Invert: The invert command reverses the brightness and
the color in the image.
Calibration: Defines “whiteness” for the scanner. Users are
recommended to calibrate the light source if the
scanned image looks undesirable or comes out to
be too dark.
Quality/Speed Mode:
Users can select either mode to perform scanning
according to their own need. Select quality mode
scanning if your emphasis is on the quality of the
scanned image. Else, select speed mode scanning
if you want to speed up the scanning process.
Pixel/Inch/Cm:
Represents the different measure systems to be
used in each scan.
Set Gamma: Adjusts the midtone of the image without losing
details of the lightest and the darkest areas.
Image Information:
Gives related information of the scanned image.

4-7
4-3 Scanning
Preview: Previews your image roughly and allocates the area to
be scanned.
Scan: Scans the area with the parameters you set.
Exit: Cancels the current job.
Document Size: To designate the size of your document, just click
on its icon on the margin of the preview window
As shown in the figure below, in the Preview window, you can
define the area to be scanned by dragging the four cursor auxiliary
lines.
Cursor
Auxiliary
lines
The Preview
Window
Document size