Canon CANOSCAN D660U Service Manual page 35

D. Drive Motor Control Circuit
When the host computer sends a command to change scaling/resolution, the ASIC generates
+
the control signal (A , A
When the host computer changes its command to the ASIC, the ASIC changes its control
signal to control the motor driver.
Drive motor
M1
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- + -
, B , B ) and sends the signal to the drive motor via the motor driver.
CCD drive PCB
+
A
A -
Motor
+
B
driver
B -
Figure 2-13
CANOSCAN D660U REV.0 JULY 2000 PRINTED IN JAPAN (IMPRIME AU JAPON)
Main PCB
Host computer
ASIC
CHAPTER 2
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