Power Supply; Low-Voltage Power Unit - Canon Color imageCLASS MF9170c Service Manual

Chapter 10

10.4 Power Supply

10.4.1 Power Supply

10.4.1.1 Low-voltage Power Unit

imageCLASS MF9170c / imageCLASS MF9150c / imageCLASS MF8450c
The low-voltage power PCB is to convert AC into DC covering the DC loads.
SW4
Power switch
Low-voltage power circuit
Protective circuit
24V generation
circuit
The low-voltage power PCB is partially activated as soon as plugged in the electrical outlet. When turning ON the power switch (SW4), whole low-voltage power
supply works.
The AC power is then converted into +24V, +5V and +3.3V covering each of machine DC loads. The following are the main loads for each power.
+24V:
Main controller PCB, high-voltage power PCB, Motors, solenoids, fans, reverse unit, and ADF
+5V:
Main controller PCB, driver PCB, laser driver PCB, high-voltage power PCB, memory controller PCB, color displacement/density sensor, and control
panel
+3.3V:
DC controller PCB, main controller PCB, driver PCB, high-voltage power PCB, memory controller PCB, sensor (photo interrupter), environment sensor,
fixing unit, control panel, reverse unit, and ADF
10-6
Low-voltage power PCB
FU3901
Fuse
Noise filter
RLD+
RLD-
FSRD
FU3801
Fuse
Noise filter
/PSSWOPEN
Remote switch
PSOFF
control circuit
ZEROX
Zero crossing
circuit
PSREM24V
24VA
24V ON/OFF circuit
5V
5V generation circuit
3.3V
3.3V generation circuit
Machine power supply PS100V
voltage detection circuit
Front cover detection switch
Fixing
24VA
control
circuit
Driver PCB
24VA 3.3V 5V
DC controller
PCB
CPU
(IC1001)
ASIC
(IC1010)
F-10-3
Fixing unit
24VB
24VB
Reverse unit
3.3V
Pickup motor Drum motor
24VB
ETB motor Fixing motor
Solenoids
3.3V
Photointerrupters
24VB
3.3V
24VB
3.3V
High-voltage power PCB
5V
3.3V
Memory controller PCB
5V
24VA
Fan Scanner motor
Color displacement/density sensor
5V
Laser driver PCB
Environment sensor
3.3V
Photointerrupters
3.3V
Main controller PCB
5V
Control panel ADF
0020-2570