Service manual

CHAPTER 2

2 - 2

2001 CANON INC. CANOSCAN D1230U/D2400U REV.0 MAR. 2001 PRINTED IN JAPAN (IMPRIME AU JAPON)

B. Electrical System

1. Outline

The scanner is not equipped with CPU. The device driver installed in the host computer

includes a control program, which functions as CPU. Host computer sends a command to the

ASIC via the USB 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 output to the host computer

via USB interface.

Figure 2-2

ASIC

USB

Controller

Regulator

Motor

Driver

FARE

Unit

Drive

Motor

CCD

PCB

Analog IC

Button PCB

AC Adapter

Host Computer

Start Button

Power LED

DRAM

Home

Position

Sensor

Control

Program

JP9

JP1

JP8

JP2

Scanning

Lamp

Inverter

PCB

(D2400U only)

FAU