Canon PC400 Service Manual - Page 34

B. Outline of Electrical Circuit, B - drivers

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CHAPTER 2 BASIC OPERATION B. Outline of Electrical Circuit The copier's main electrical mechanisms are controlled by the microprocessor on the DC controller/DC power supply PCB. According to the program stored in advance, the microprocessor reads input signals from the control keys, and generates signals to drive such loads as motors, solenoids, and lamps, as necessary. Copyboard position sensor Q Delivery sensor Pick-up sensor Photointerrupter Fixing heater temperature sensor TH1 Thermistor Power switch Control key Microprocessor Driver assembly DC controller/DC power supply PCB High-voltage transformer Scanning lamp Main motor Solenoid DC load Primary/Transfer charging roller Developing cylinder Q101 +DC5V Sub power supply circuit +DC24V +DC5V DC power supply PCB Display Door switch Delivery door switch Relay AC driver Driver Heater AC load Scanning lamp Figure 2-101B 2-2 COPYRIGHT © 1998 CANON INC. CANON PC400/420/430,FC200/220 REV.0 JAN.1998 PRINTED IN JAPAN (IMPRIME AU JAPON)

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COPYRIGHT © 1998 CANON INC.
CANON PC400/420/430,FC200/220 REV.0 JAN.1998 PRINTED IN JAPAN (IMPRIME AU JAPON)
2-2
CHAPTER 2 BASIC OPERATION
B. Outline of Electrical Circuit
The copier’s main electrical mechanisms are controlled by the microprocessor on
the DC controller/DC power supply PCB.
According to the program stored in advance,
the microprocessor reads input signals from the control keys, and generates signals to
drive such loads as motors, solenoids, and lamps, as necessary.
Q101
TH1
Q
Photointerrupter
Thermistor
Relay
Door
switch
High-voltage
transformer
DC load
Sub power
supply circuit
DC power
supply PCB
AC driver
AC load
Developing
cylinder
Primary/Transfer
charging roller
Display
+DC5V
+DC24V
+DC5V
Scanning lamp
Main motor
Solenoid
Heater
DC controller/DC power supply PCB
Copyboard position
sensor
Delivery sensor
Pick-up sensor
Fixing heater
temperature sensor
Power switch
Control key
Delivery
door
switch
Microprocessor
Driver assembly
Driver
Scanning lamp
Figure 2-101B