Canon PC940 Service Manual - Page 60
Turning On/Off the Scanning Lamp, When LAMP_ON is '1
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CHAPTER 3 EXPOSURE SYSTEM 2. Operations a. Turning On/Off the Scanning Lamp The DC controller PCB and the composite power supply exchange signals in serial communication to control the scanning lamp. According to the scanner lamp active voltage signal, the microprocessor (Q900) on the composite power supply PCB controls the intensity adjustment signal (PWM_1KHz) and the lamp activation signal (LAMP_ON) to turn on/off the scanning lamp (LA1). When LAMP_ON is '0', The phase control circuit turns on. The arcing circuit turns on. The scanning lamp turns on. When LAMP_ON is '1', The phase control circuit turns off. The arcing circuit turns off. The scanning lamp turns off. 3-10 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
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