Canon CanoScan 9900F Service Manual download pdf (Page 18)

CHAPTER 2

2 - 2

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2003 CANON INC. CANOSCAN 9900F REV.0 FEB. 2003 PRINTED IN JAPAN (IMPRIME AU JAPON)

ASIC

USB

Controller

Regulator

Motor

Driver

FARE

Unit

Drive

Motor

CCD

PCB

Analog IC

Button PCB

+24V

AC adapter

Host Computer

Scanner Button

Power LED

DRAM

Home

Position

Sensor

Control

Program

JP9

JP1

JP8

JP2

Scanning

Lamp

Inverter

PCB

FAU

FAU Lamp

Inverter

PCB

JP9

IEEE-1394

Controller

JP9JP9

B. Electrical System

1. Outline

Figure 2-2 is an electric system circuit diagram.

The scanner is not equipped with CPU. The device driver with a control program installed in

the host computer functions as CPU. The host computer sends a command to the ASIC via the

USB controller or IEEE 1394 controller. The ASIC 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 is then processed by the ASIC and is output to the host

computer via USB interface.

Figure 2-2

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Canon CanoScan 9900F Service Manual Page 18

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