Canon FB1210U Service Manual

SERVICE MANUAL

REVISION 0

APR. 2000

JY8-1316-00Z

Printed in Japan

Imprimè au Japon

Use of this manual should be strictly supervised to avoid disclosure of confidential information.

LIST OF SERIAL NUMBER

CanoScan FB1210U F91-4411 AZG000000-

F91-4431 CZG000000F91-4441 DZG000000F91-4451 EZG000000F91-4461 FZG000000F91-4471 LZG000000F91-4421 MZG000000F91-4491 JZG000000-

CHAPTER 1

GENERAL DESCRIPTIONS

I. SPECIFICATIONS....................... 1-1

II. PARTS CONFIGURATION ........... 1-2

A. Front View .......................... 1-2

B. Rear View ............................ 1-2

III. SETTING UP THE SCANNER ...... 1-3

A. Precautions ......................... 1-3

B. Unlocking the Scanning Unit 1-4

C. Connecting the Cables ......... 1-5

D. Scanning a Document .......... 1-6

IV. CUSTOMER’S DAILY MAINTENANCE

........................................... 1-7

I. SPECIFICATIONS

Main Unit

Type : Flatbed image scanner

Reading Unit

Image sensor : 10,550-pixel 3-line CCD Light source : Cold cathode fluorescent lamp Document type : Sheet, Book Document alignment position : Right-end corner Max. document size : A4/Letter size (216 x 297mm) Image output mode : Color 14-bit for RGB each

Grayscale (256 gradations)

Binary (black and white) Optical resolution : 1200 dpi x 2400 dpi Scanning time : 7 min. and 10 sec. (color, A4, 1200 dpi)

3 min. (grayscale, A4, 1200 dpi)

7 sec. (binary, A4, 1200 dpi) Cropping of scan area : One rectangular area only

CHAPTER 1

Interface

Interface : USB (Universal Serial Bus) 1.1

Others

Operating environment : Temperature : 10 to 35 degrees

Relative humidity : 20 to 80%RH

Air pressure : 608 to 1013 hPa Power consumption : 15 W or less (during operation)

8 W (during standby) Dimensions : 286.0 (Width) x 461.0 (Depth) x 92.5 (Height) mm Weight : Approx. 3.8 kg Option : Film Adapter Unit FAU-S11

Specifications are subject to change without prior notice.

1 - 1

CHAPTER 1

II. PARTS CONFIGURATION

A. Front View

q DocumentCover w Document Glass e Start Button

1

2

LTR

A4

B5

B. Rear View

q USB Connector w Option Connector e Power Connector

B5

LTR

3

A4

Figure 1-1

1

2

1 - 2

3

Figure 1-2

CHAPTER 1

III. SETTING UP THE SCANNER

A. Precautions

* Keep the scanner out of direct sunlight. Direct exposure to the sun or excessive heat may

cause damage to the scanner. * Do not install the scanner in a humid or dusty environment. * Use the supplied AC adapter only. * Place the scanner securely on an even, flat surface. Tilted or uneven surface may cause a

mechanical problem. * Keep the outer carton and packing material in case you may ship the scanner in the future.

1 - 3

CHAPTER 1

B. Unlocking the Scanning Unit

Scanning unit is locked by the carriage lock to prevent a damage during transport. Unlock the scanning unit by pushing the carriage lock toward the “unlock” mark to use the scanner.

1

LTR

A4

B5

LTR

A4

q Carriage Lock

Figure 1-3

Note : Ensure to lock the scanning unit during transport.

1 - 4

CHAPTER 1

C. Connecting the Cables

FB1210U is connected to the USB port on the host computer. Refer to the “Getting Started” bundled with the product for details. For connecting the host computer’s cables, refer to the manuals for the host computer.

1. Connect the AC Adapter Cable and USB Cable

1) Connect the AC adapter plug to the power connector on the scanner.

2) Connect the square plug (B type) of the USB cable to the USB connector on the scanner, and

connect the flat plug (A type) of the USB cable to the USB port on the host computer.

q USB Connector w USB Cable e Power Connector r AC Adapter

1

2

3

4

Figure 1-4

1 - 5

CHAPTER 1

D. Scanning a Document

1) Open the document cover.

2) Place a document on the document glass, facing the image side down and aligning the upper corner with the alignment mark.

LTR

A4

B5

...XYZ

B5

LTR

A4

q Alignment Mark

Figure 1-5

3) Close the document cover, caring not to dislodge the document.

4) Send “SCAN” command from the host computer to scan.

1

1 - 6

CHAPTER 1

IV. CUSTOMER’S DAILY MAINTENANCE

Dirt on the document glass may cause an unclear image or lines on an image. Clean the document glass using the following procedures.

1) Disconnect all cables from the scanner.

2) Wipe a dirt off the document glass with a soft clean cloth dampened with water and well wrung.

3) Thoroughly wipe water off the document glass with a dry cloth.

1 - 7

CHAPTER 2

OPERATION AND TIMING

I. BASIC OPERATION .................... 2-1

A. Functions ............................ 2-1

B. Electrical System ................ 2-2

C. Main PCB Input and Output. 2-4

D. Basic Sequences of Operations

........................................... 2-5

II. OPTICAL SYSTEM ..................... 2-7

A. Scanning Lamp .................... 2-8

B. Motor Control ..................... 2-9

III. IMAGE PROCESSING ............... 2-10

A. Outline .............................. 2-10

B. Image Processing............... 2-11

C. Calibration ........................ 2-13

D. Filter Processing ............... 2-14

E. Interpolation Processing.... 2-15

F. Averaging .......................... 2-16

G. Binary Processing .............. 2-17

H. Image Inversion

(negative/positive) ............ 2-18

IV. CONTROL SYSTEM ............ 2-19

A. Control System Diagram.... 2-19

B. Main PCB .......................... 2-19

V. INTERFACE ............................. 2-20

A. Overview of the USB Standard

......................................... 2-20

B. Benefits of the USB Scanner

......................................... 2-20

C. Signal Definitions .............. 2-21

D. Interface Connection ......... 2-21

VI. POWER SUPPLY....................... 2-22

CHAPTER 2

I. BASIC OPERATION

A. Functions

The scanner functions are divided into the following three main systems.

1. Optical System

The optical system consists of the scanning lamp, lens and mirrors. It exposes a document, then the reflected light from the document is collected onto a light-sensitive device CCD (charge-coupled device ) via the lens and mirrors.

2. Image Processing System

The image processing system consists mainly of the CCD, analog IC, and ASIC. It converts analog signals from the CCD into digital signals, which is read by the host computer.

3. Control System

The control system consists mainly of ASIC, USB controller, CPU, and motor driver. The CPU controls the whole scanning operation. The USB controller controls the interface between the CPU and ASIC, while the CPU interprets all commands from the host computer.

Optional Film Adapter Unit FAU S-11

BGR

Scanning

Unit

Lens

Image Processing System

Optical System

*

Drive Motor

Host

Computer

Control System

Scanning

Lamp

B G R

CCD

Figure 2-1

2 - 1

CHAPTER 2

B. Electrical System

1. Outline

The scanner is equipped with CPU and USB controller. Host computer sends a command to the ASIC via the USB controller and CPU, the CPU controls the whole electrical circuits and image processing of the scanner. The image signals read by the CCD are converted into digital data by analog IC. The digital data are then processed by the ASIC and output to the host computer via USB interface.

Host Computer USB Interface

+12V

AC Adapter

CCD PCB

Drive Motor

Inverter

PCB

Regulator

Analog IC

Motor Driver

5V

USB

Controller

CPU

ASIC

ROM SRAM

Button PCB

Start Button Power LED

Home Position Sensor

DRAM

2 - 2

Figure 2-2

2. Functions of the Main PCB

1) Analog IC

Converts the image signals (analog signals) read by the CCD into digital data.

- CDS (Correlated Double Sampling)

- AGC (Auto Gain Control)

- 14-bit A/D converter (Analog-to-Digital Converter)

2) ASIC

Performs various processing:

- DRAM control

- CCD timing clock creation

- Line buffer control

- CCD output line difference adjustment

- Image processing (Binary processing, Image inversion)

- Shading correction

- Motor driver control

CHAPTER 2

3) DRAM

Stores the shading correction data when performing shading correction, and the image data when scanning.

4) Motor Driver

A monolithic microstep motor driver supplies power to the drive motor.

5) USB Controller

Transmits data between the host computer and ASIC.

6) CPU

Interprets commands from the host computer to generate parameter for the ASIC to perform various processing.

2 - 3

CHAPTER 2

C. Main PCB Input and Output

Adapter

Scanning Unit

AC

J1-1

JP1-1

-10

-11

-12

-13

-14

-15

-16

-17

-18

-19

-20

-21

-22

-23

-24

-25

-26

-27

-28

-2

-3

-4

-5

-6

-7

-8

-9

+12V GND

LAMP_GND LAMP_GND 12V_LAMP 12V_LAMP +15VP +15VP DGND PHI1 DGND PHI2 DGND CLB DGND DGND DGND RB DGND TG VCC DGND AGND AGND AGND CCD_B AGND CCD_G AGND CCD_R

Main PCB

CHK_FAU

FAU_LAMP

GND

Vbus

D+

GND

JP2-1

-2

To FAU

-3

JP4-1

D-

-2

To Host

-3

Computer

-4

Power

LED

Start

Button

Button PCB

Home Position

Sensor

Drive Motor

JP3-1

-2

-3

JP5-1

-2

-3

-4

Figure 2-3

VCC LED HOTKEY0

OUT1B OUT1A OUT2A OUT2B

"H" when power LED

is ON

"H" when start button

is pressed

"H" when scanning unit

is in home position

Drive motor drive signal

2 - 4

CHAPTER 2

D. Basic Sequences of Operations

The basic sequences of operations of CanoScan FB1210U is divided into the power ON sequence and the document scanning sequence.

1. Power ON Sequence

Power ON

(1) Check Analog IC register

and ASIC port

(2) Execute Analog IC

read/write test

(3) Access a fixed address

(4) Access full memory

Execute USB cable test (1)

Connect the scanner.

Power LED is ON?

Y

Execute R/W test (2)

Analog IC R/W test failed?

N

Execute memory R/W test (3)

Memory R/W test failed ?

N

Execute full memory R/W test (4)

Full memory R/W test failed ?

N

Y

Error returns

N

Execute DMA transit test (5)(5) Access DMA transit test

(6) Move drive motor forward

100 steps then backward to check carriage lock on/off

Y

DMA transit test failed ?

N

Check carriage lock on/off (6)

N

Carriage lock is off ?

Y

Standby

Error returns

Figure 2-4

Error returns

2 - 5

CHAPTER 2

2. Document Scanning Sequence

Scan Command

Sequence

Time (Sec.)

Home Position Sensor

Scanning Lamp ON Signal

Drive Motor

Interface Signal

Standby Setup Scanning Unit Forward

2.0 90.0

0.1

Figure 2-5

Scanning Unit Backward

9.0

Standby

Sequence

Standby

Setup

Scanning unit forward

Scanning unit backward

Operation

After the power ON sequence is completed until the scanner receives a scan command from the host computer

From the scanner receives a scan command until it starts scanning

After the scanner starts scanning until whole scan area specified

by the host computer are

scanned

After the scanning unit starts moving backward until it returns to the home position

Purpose

To maintain the scanner ready for scan

To execute calibration for setting gain data and shading data

To execute image processing according to the command from the host computer and send image data to the host computer while scanning

To return the scanning unit to the home position to ready for the next scan

Remarks

The data is stored in DRAM

Home position is detected by the home position sensor

2 - 6

Table 2-1

CHAPTER 2

II. OPTICAL SYSTEM

The optical system has functions from exposing a document by the scanning lamp to collecting the reflected light to the CCD. The system employs a 3-line CCD to recognize colors of the document.

CCD

Lens

Scanning Lamp

LTR

A4

B5

LTR

A4

Figure 2-6

2 - 7

CHAPTER 2

A. Scanning Lamp

When the scanner is powered on, the scanning lamp lights to standby. The scanner is provided with an energy saving setting which is made in the Scanner Utilities Dialog. For example, if it is set for 30 minutes, then no scan command is sent for 30 minutes, ASIC sends the scanning lamp off signal to turn off the lamp.

Scanning Lamp

Main PCB

AC

Adapter

PWM

Host

Computer

CPU

ASIC

GND

Figure 2-7

CCD PCB

GND

Inverter

PCB

2 - 8

CHAPTER 2

B. Motor Control

When the host computer sends a command to change scaling/resolution, the motor driver current control signals [PA+, PA-, PB+, PB-] are changed to generate a torque for the rotating speed. Yet, the reverse speed of the scanning unit is always constant.

The ASIC receives each command sent from the host computer via the USB interface to control the motor by four-phase motor driver pulse signals [OUT1B, OUT1A, OUT2A, OUT2B].

Main PCB

Host

Computer

ASIC

PA+

PA-

PB+

PB-

Figure 2-8

Motor Driver

OUT1B

OUT1A

OUT2A

OUT2B

Drive Motor

2 - 9

CHAPTER 2

III. IMAGE PROCESSING

A. Outline

The image processing system converts light signals read by the CCD to electric signals, then outputs the image data to the host computer via the USB interface upon various image processing.

SRAM

CPU

ROM

USB Connector

D+

USB

D-

Home Position

USB

Controller

Sensor

Clock

Control Signal

Data

Status Signal

ASIC

Motor Driver

Drive Motor

Figure 2-9

Data

Inverter

DRAM

Control

Signal

Control Signal

Clock

Data

Analog IC

Scanning Lamp

Vin

CCD

Control Clock

2 - 10

CHAPTER 2

B. Image Processing

1. Analog IC

Output signal from the CCD is an analog signal which cannot be used as image data. So RGB output signal from the CCD is amplified by analog amplifier to generate analog data. The generated data is converted into averaged analog signal by D/A converter, then got feedback to the A/D converter to output constant digital data to the ASIC.

D/A Converter

CCD

R G B

Analog

Amplifier

Analog IC

A/D Converter

Digital data

To ASIC

Figure 2-10

2 - 11

Canon FB1210U Service Manual

CONTENTS

CHAPTER 1

I. SPECIFICATIONS

II. PARTS CONFIGURATION

III. SETTING UP THE SCANNER

IV. CUSTOMER’S DAILY MAINTENANCE

CHAPTER 2

I. BASIC OPERATION

II. OPTICAL SYSTEM

III. IMAGE PROCESSING