Canon CP660 Service Manual page 74

CHAPTER 3 LASER EXPOSURE SYSTEM
The PWM IC (IC208) generates PWM modulation signals (VDATA*; PWM video sig-
nals); then, it sends two sets of laser drive signals (DATA*, BDATA) through the LVDS IC
(IC209) to the laser driver PCB. The receiver (IC1001) on the laser driver PBC demodu-
lates these two sets of signals to generate laser drive signals (DATA*) for the laser drive
IC (IC1002).
When the APC sampling timing signal (SAMPLE*) is '1' and the image enable signal
(LENB*) is '0', the laser drive IC turns on the laser diode in response to the laser drive
signal (DATA*).
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* Reader controller PCB (when making prints with the reader unit installed).
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CANON 660/2100 REV.0 FEB. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)