Canon iPF825, Service Manual

Page: 112 / 316

Chapter 2
2-42
2.4.5 Motor Driver
2.4.5.1 Lower roll unit PCB components
0020-5556
F-2-30
a) Driver IC (IC2)
The lower roll media pick-up motor is controlled on the basis of a control signal generated from the main controller PCB.
b) Clutch/solenoid control function
The clutch and solenoid are controlled on the basis of a control signal generated from the main controller PCB.
c) Sensor relay function
The sensor relay function transfers input signals from the sensors and switches to the main controller PCB.
2.4.6 Maintenance Cartridge Relay PCB
2.4.6.1 Maintenance cartridge relay PCB components
0013-6532
F-2-31
a) EEPROM (IC1)
The 2-KB EEPROM stores all information written in the EEPROM on the main controller PCB.
2.4.7 Power Supply
2.4.7.1 Power supply block diagram
0012-6414
F-2-32
The power supply converts AC voltages ranging from 100V to 240V from the AC inlet to DC voltages for driving the ICs, motor, and others.
The voltage generator circuits include the +32V generation circuit for driving motors, fans, and the +5.1V generator circuit for driving sensors, logic circuits.
When in the power saving mode, the power supply cut out the +32V and the +5.1V.
Power ON/OFF operation is controlled by the main controller PCB. When the upper cover is open, the power supply cut out only the +32V power to the carriage.
IC2
IC 1
Operation panel
Transformer
DC power supply
control circuit
+5.1V
generation circuit
+32V
generation circuit
POWER ON
Rectifying circuit
Noize filter circuit
AC inlet
100V to 240V
Power supply Main controller PCB
+5V/+3.3V
generation circuit