BenQ 2720S User manual

BENQ PROFESSIONAL FILM SCANNER
SCANWIT 2740S
SERVICE GUIDE

Table of Contents
Table of Contents .............................................................. i
Chapter 1 System Overview............................................ 1-1
1.1 Features ............................................................................. 1-1
Chapter 2 Specifications and Section Namess .................... 2-1
2.1 Specifications ...................................................................... 2-1
2.2 Sectional Diagram................................................................ 2-2
Chapter 3 Theory of Operation ........................................ 3-1
3.1 Fundamental of Optic Process ................................................ 3-1
3.2 Scan Process ....................................................................... 3-2
Chapter 4 Mechanism .................................................... 4-5
4.1 Optics Module...................................................................... 4-5
4.2 Transmission Module ............................................................ 4-8
Chapter 5 Electrical Systems........................................... 5-1
5.1 Overview ............................................................................ 5-1
5.2 SCSI Interface..................................................................... 5-5
5.3 Scanner Controller (ASIC & µP) ............................................. 5-7
5.4 Analog Circuits .................................................................... 5-8
5.5 CCD Head/Elements ............................................................. 5-9
5.6 Main Flow Chart of Film Scanner .......................................... 5-10
5.7 Connectors of Scanner 2740S .............................................. 5-11
Table of Contents API Confidential i
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Chapter 6 Trouble-shooting............................................. 6-1
6.1 Error Code Identification from “Status” LED ............................. 6-1
6.2 No Function after Power On:.................................................. 6-1
6.3 Cannot Link with Host Computer:........................................... 6-1
6.4 Flash "1" time: .................................................................... 6-2
6.5 Flash "2" times:................................................................... 6-2
6.6 Flash "4" times:................................................................... 6-2
6.7 Flash "5" times:................................................................... 6-2
6.8 Flash "6" times:................................................................... 6-2
6.9 Flash "7" and "8" times:........................................................ 6-2
6.10 Scan Quality not Good: ....................................................... 6-3
6.11 Power Supply..................................................................... 6-3
6.12 CCD Head ......................................................................... 6-3
Chapter 7 Maintenance .................................................. 7-1
7.1 Precaution .......................................................................... 7-1
7.2 Housing Section................................................................... 7-1
7.3 Transmission Section ............................................................ 7-3
7.4 PCB-frame Section ............................................................... 7-5
7.5 Panel Board Section ............................................................. 7-6
7.6 About Resolution.................................................................. 7-7
Appendix A Frequently Asked Questions ........................... A-1
A.1 General Questions................................................................ A-1
A.2 MiraPhoto ........................................................................... A-2
A.3 Hardware (Scanner) ............................................................. A-6
A.4 Others................................................................................ A-9
ii API Confidential Table of Contents
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Appendix B Spare Parts Ordering Information.................... B-1
B.1 Ordering Information............................................................ B-1
B.2 Spare Parts List ................................................................... B-1
Appendix C Explosive Diagram ........................................ B-1
C.1 Ordering Information............................................................ B-1
C.2 Spare Parts List ................................................................... B-1
Table of Contents API Confidential iii
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Chapter 1 System Overview
This chapter includes an overview of the professional film scanner
features.
1.1 Features
 2700 ×2700 dpi optical resolution
 36-bits, over 68.7 million colors for true-to-life accuracy
 Fast scan speed: complete a 2700 dpi scan within 40 sec.
 Auto Positioning and Focusing Technology to secure a sharper image
 Advanced zero-reflection optical design for a undistorted scan image
 Auto-loading mechanism can preview/scan up to six frames at one
time
 3.2D high dynamic range for greater color fertility
 3-channel ASIC and A/D converter design for accurate color
registration
 All software with this scanner is Year 2000 compliant
 Implement DICE technology (Digital defect correction technology).
 Automatic object handling mechanism can preview / scan six frames
of image in one click.
 The first film scanner in the world offers the utmost user friendly 'push
mode' function.
 Fast preview and scan speed
 3 channels A/D converter.
System Overview API Confidential 1-1
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Chapter 2 Specifications and Section Names
This chapter lists the specifications and section names of the film scanner.
2.1 Specifications
Machine Type Professional film scanner
Scan Method 3 pass , color CCD
Scan Mode grayscale 12 bits/pixel (4096 levels of gray)
color 48 bits/pixel (over 68.7 billion colors)
Optical Resolution 2700 ×2700 dpi
Scanning Area
Slide: 35mm mounted size (Max. batch scan 4 units)
Filmstrip 35mm size (Max. batch scan 6 units)
Interface SCSI II
Scan Velocity Calibration Color: 5 sec
Scan Speed Color: less then 10ms/line,
less than 38s/35mm film, 2700dpi
Preview Speed Color: 5sec for 35mm film
Transmission 2 Megabyte/sec
Scan Mode & ICE Mode High Speed Mode
High Quality mode – 24 bits/pixel
High Quality mode – 36 bits/pixel
Demission 162mm ×151mm ×347mm (W×H×L)
Net Weight 2.6 kgs
System Requirement
For IBM PC & Compatible
Pentium CPU with 32MB RAM
CD-ROM drive
Windows NT 4.0/95/98/2000
Specifications and Section Names API Confidential 2-1
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For Macintosh
Power PC with 32MB RAM
CD-ROM drive
Mac OS 8.6-9.1
Power Consumption 25 Watt maximum
Power Requirement Voltage 100, 110, 220, or 240V (AC)
Frequency 50/60Hz
Environment Requirement Operational Temperature 10℃to 40℃
Relative Humidity 10% to 90%
2.2 Sectional Diagram
The main parts of the scanner are shown in the Figure 2-1, Figure 2-2,
and Figure 2-3, and Figure 2-34, and the names of the parts are listed in
Table 2-1, Table 2-2, Table 2-3 and Table 2-34.
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Figure 2-1 Main Parts Diagram
1 Base 17 Motor Frame 33 Feed Roller
2 Lamp 18 Gear 34 Gear
3 Inverter Board 19 Pulley Gear 35 Belt
4 Rod 20 Bot + Tape 36 E-Ring
5 Panel Board 21 Foot Rubber 37 Screw
6 Pulley Frame 22 Bracket 38 Screw
7 P-Spring 1 23 Spring – Top base
39 Screw
8 Pulley 24 Spring 40 Screw
9 E-Ring 25 Wire Frame 41 Screw
10 Shield 26 Wire 42 Screw
11 Sensor Board 27 Shaft 43 Screw
Specifications and Section Names API Confidential 2-3
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12 Shutter 28 Friction PE 44 Screw
13 Sutter Bracket 29 Feed Bracket 45 Screw
14 Shutter Spring 30 DC Motor 46 Strip Friction PE
15 Scan Motor 31 Idle Pulley 47 IR Led Board
16 Motor Rubber 32 Torque Limiter
Table 2-1 Main Parts List
Figure 2-2 CCD Module Section
1 Module 11 Rack 1
2 Tuning Holes Tape 12 E-Ring Plastic Nylon 2.1*5*0.5T
3 Lens Window Cover 13 Gear B-2
4 SCRW SHM3-0.5*5 SCM3 14 SCRW MACH PAN M2*6L NI
5 Lens 15 Sensor
6 CCD Board 16 Bracket
7 CCD Board Cover 17 Gear B-1
8 Shaft – L 18 Motor 7.5G M25SP-3NP 86 ohm
9 SCRW PAN W/FLT SPG M3*8L B-ZN 19 SCRW MACH PAN W/SPG M3*6L NI
10 SCRW MACH PAN W/SPG M3*6L NI 20 Spring - T
Table 2-2 CCD Module Section Parts List
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Figure 2-3 PCB Frame Section
1 PL Board 6 Power Inlet
2 Main Board 7 Screw
3 Power Shield 8 Screw
4 Power Board 9 Screw
5 SCSI ID Switch 10 Insulation
Table 2-3 PCB Frame Section Parts List
Specifications and Section Names API Confidential 2-5
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1 Base
2 Lamp
12 IR Led Board
13 Screw
14 Preheater
Table 2-4 IR Led Board Section Parts List
Figure 2-4 IR Led Board Section
2-6 API Confidential Specifications and Section Names
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Chapter 3 Theory of Operation
This chapter describes the optic process and the scan sequences of the
Film Scanner.
3.1 Fundamental of Optic Process
There are three steps for the optic process: Auto-Focusing, Imaging and
Receiving.
3.1.1 Auto Focusing
By moving lens cartridge forward/backward the object (film/slide) and
analysis the signal to get the focus in an optimized status.
3.1.2 Imaging
Applying a lens to obtain a proportionally reduced image.
Figure 3-1 Imaging
3.1.3 Receiving
The CCD receives the light, then transfers the intensity of light to voltage
signal. The voltage signals are data for the future process.
Theory of Operation API Confidential 3-1
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Figure 3-2 Receiving
3.2 Scan Process
3.2.1 Preset
Put the to-be-scanned object (Slide/Film) into holder and gently insert
into holder insertion slot. Two types of holders are supplied with film
scanner: filmstrip and slide holders.
3.2.2 Auto-Focus
First the holder will do “White balance”, which means CCD reads signals
from calibration area in holder to be “White”. Then holder moves to a
position contains film/slide and remain still. Lens cartridge starts moving
toward/backward the object and analysis the output signals to get focus
optimized.
3.2.3 Preview
The holder starts moving while lens cartridge remains fixed and reads in
image signals roughly. Then the images are shown on the screen.
3.2.4 Pick Target
Pick the desired scanning area and position. In addition, you can choose
scanning condition, such as scan types (color or gray), resolution (DPI),
hi-light...etc. You have several choices to do your scanning.
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3.2.5 Scan
Applying a lens to form an image. And this image must be precisely
formed on the color CCD.
Then color CCD receives the light, transfers the intensity of light to
voltage, and outputs the voltage to processor.
3.2.6 Output
The scanned image of the object is output on the monitor after detail and
complex calculations.The detail flow chart is shown in Figure 3-3.
Theory of Operation API Confidential 3-3
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START
PRESET
PREVIEW
AUTO-FOCUS
IMAGING
PICK TARGET
ENVIRONMENT
RECEIVING
PROCESSING
MONITOR
MORE IMAGE PROCESS
Y
Y
N
Y
N
N
Figure 3-3 Scan process flow chart
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Chapter 4 Mechanism
This chapter illustrates the mechanisms of the film scanner and describes
the functions of these mechanisms.
The scanner's mechanism can be divided into two major departments:
※Optics Module
※Transmission Module
4.1 Optics Module
The parts to compose optics module are showed as below (Figure 4-1).
This module ensures that the object can exactly form an image and
transform light energy to voltage signal, which is critical for the image
management.
Figure 4-1 Detail Parts of Scan Module
Mechanism API Confidential 4-5
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The optics process can be divided into three steps in detail: light source,
imaging and receiving. The light path diagram is shown in Figure 4-2. And
the three steps will be described in the following:
Figure 4-2 Diagram of Light Path
4.1.1 Light Source
Using a lamp to be the light source here. Reflect plate is a tool that used
to increase light intensity. Applying light to go through the object and the
non-reflected light will pass through window cover, lens, and finally forms
an image on color CCD. If the intensity of light is too low, the color CCD
can't work precisely. Please replace a new lamp under this situation.
4.1.2 Imaging
It gets an image by lens in this step, and the diagram is shown in Figure
4-3. The light of the object passing through this lens to form an image on
the CCD, and the magnification (M) equals image distance (q) divided by
object distance (p), i.e., M= q / p. From Fig.4-4, we can get the paraxial
formula about lens focus (f), object distance (p) and image distance (q).
The formula describes relation between lens focus (f), object distance (p),
and image distance (q) as 1/f = 1/p +1/q.
4-6 API Confidential Mechanism
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