Canon PC980 Service Manual - Page 38

CHAPTER 2 BASIC OPERATION B. Outline of Electrical Circuitry The machine's major electric mechanisms are controlled by the microprocessor mounted on the DC controller PCB, which reads input signals from sensors and operating keys according to the instructions of the program stored in advance and sends signals used to drive motors, solenoids, lamps, and other loads as needed. Sensor DC controller PCB Q101 • Scanner home position detection • Lens home position detection CPU +5V +24V • Pre-registration roller paper detection • Delivery paper detection • Vertical path roller paper detection • Single-feeder paper detection Composite power supply PCB Scanning lamp Q900 CPU Fixing heater Highvoltage circuit block Contact PCB • Primary charging roller • Developing cylinder • Transfer charging roller • Static eliminator AE sensor PCB Thermistor • Scanner thermistor • Fixing thermistor Control panel Main motor Main driver PCB motor Solenoid • Pickup clutch solenoid • Registration clutch solenoid • Lens solenoid • Multifeeder pickup solenoid • Cassette pickup solenoid Side blanking lamp Power switch Scanner/ lens drive motor Scanner cooling fan Sensor/ switch ADF ADF load Figure 2-102 2-2 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)