CHAPTER 2 BASIC OPERATION
COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
2-2
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.
Figure 2-102
Sensor
Q101
CPU
Q900
CPU
Scanning lamp
Fixing heater
Contact
PCB
High-
voltage
circuit
block
+5V
+24V
Main motor
driver PCB
Solenoid
Side blanking
lamp
Scanner/
lens drive motor
Scanner cooling fan
Power
switch
Main
motor
Sensor/
switch
ADF load
Control
panel
Thermistor
AE sensor
PCB
• Scanner home position detection
• Lens home position detection
• Pre-registration roller paper
detection
• Delivery paper detection
• Vertical path roller paper detection
• Single-feeder paper detection
• Scanner thermistor
• Fixing thermistor
<Loads>
<Sensor Block>
<Control Block>
Composite
power supply PCB
DC controller PCB
• Primary charging roller
• Developing cylinder
• Transfer charging roller
• Static eliminator
• Pickup clutch solenoid
• Registration clutch solenoid
• Lens solenoid
• Multifeeder pickup solenoid
• Cassette pickup solenoid
ADF
Содержание PC920
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