Service manual

CHAPTER 2

2 - 20

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

IV. CONTROL SYSTEM

A. Control System Diagram

Figure 2-21

B. Main PCB

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

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

ASIC in the main PCB, the ASIC controls the whole electrical circuits and image processing of

the scanner.

Main PCB consists of ASIC, DRAM, USB controller, analog I/C and motor driver.

ASIC

+12V

Host Computer

Main PCB

AC Adapter

Scanning Unit

Inverter &

Scanning Lamp

Drive Motor

DRAM

USB

Controller

Motor

Driver

Control

Program

Analog