Outline Of Electrical Circuitry - Canon NP6412 Service Manual

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 Block>
Sensor
• Scanner home position detection
• Lens home position detection
• Pre-registration roller paper
detection
• Delivery paper detection
• Vertical path roller paper detection
• Waste toner detection
AE sensor
PCB
Thermistor
• Scanner thermistor
• Fixing thermistor
Control
panel
Power
switch
Sensor/
switch
2-2
COPYRIGHT © 1999 CANON INC.
<Control Block>
DC controller PCB
power supply PCB
Q101
CPU
+5V
+24V
ADF
Figure 2-102
CANON NP6512/6612/7120/7130/7130F REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
<Loads>
Composite
Scanning lamp
Q900
CPU
Fixing heater
High-
Contact
voltage
PCB
circuit
block
Toner level
detection PCB
Main motor
driver PCB
• Pickup clutch solenoid
• Registration clutch solenoid
• Lens drive solenoid
Solenoid
• Multifeeder pickup solenoid
• Cassette pickup solenoid
• Primary charging roller cleaning solenoid
Side blanking
lamp
Scanner/
lens drive motor
Pre-exposure
lamp
Scanner cooling fan
Counter
ADF load
• Primary charging roller
• Developing cylinder
• Transfer charging roller
• Static eliminator
Main
motor