Service manual

CHAPTER 2

2 - 12

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

D. Motor Control Circuit

Control program analizes a command sent from the host computer, and sends a motor clock

generation command to ASIC. Gate array generates four-phase motor drive pulse signals [I01,

I11, I02, I12], which are sent to the drive motor via motor driver.

When the host computer sends a command to change scaling/resolution, the control program

commands the ASIC to change the frequency of the motor drive pulse signal to change the

drive motor rotating speed.

Figure 2-11

Main PCB

Drive Motor

Host Computer

ASIC

Motor

Driver

OUT1B

OUT1A

OUT2A

OUT2B

JP8-1

-2

-3

-4

Control

Program

I02

I01

I11

I12