Motor Control Circuit - Canon CANOSCAN D1230 series Service Manual

CHAPTER 2
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.
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COPYRIGHT
Host Computer
Control
Program
Main PCB
I02
I01
ASIC
I11
I12
Figure 2-11
©
2001 CANON INC. CANOSCAN D1230U/D2400U REV.0 MAR. 2001 PRINTED IN JAPAN (IMPRIME AU JAPON)
OUT1B JP8-1
OUT1A -2
Motor
OUT2A -3
Driver
OUT2B -4
Drive Motor