Rated Output Of The Power Supply Pcb; Protection Function; Protective Mechanisms - Canon imageCLASS MF7460 Service Manual

left door has opened.
Part Name
Power supply PCB
Option power supply PCB (option)
Main power switch (SW1)
Front cover switch (SW2)
Left door switch (SW3)
P1

9.3.1.2 Rated Output of the Power Supply PCB

imageCLASS MF7460 / imageCLASS MF7470 / imageCLASS MF7480
Output
Rated output voltage
Output voltage tolerance
Rated output current
Overcurrent protection trigger current
Overvoltage protection trigger voltage

9.3.2 Protection Function

9.3.2.1 Protective Mechanisms

imageCLASS MF7460 / imageCLASS MF7470 / imageCLASS MF7480
The power supply PCB is provided with an overcurrnet/overvoltage protection function to automatically cut off the output voltage when a trouble such as a short
circuit occurs on in the load.
When the overcurrnet/overvoltage protection function is activated, turn off the main power switch, solve the trouble with the load, and then turn on the main power
switch.
Further, the power supply circuit has two fuses which blow to stop power supply when an excessive current flows in the AC line.
Function
Generates DC power from AC power.
Generates DC power from AC power for the options.
Supplies AC power to the power supply PCB.
Detects opening/closing of the front cover and cuts off +24 VR.
Detects opening/closing of the left door and cuts off +24 VR.
: AC
: DC
Power supply PCB
SW1 F1 F2
NF NF
Low-voltage
power supply
RL1
circuit
Heater drive
circuit
TP1
H1
H2
24V
24V
+10%, -5%
3.5A
9.0A
32.5V
T-9-2
Option
+24Vop
power supply
PCB
+24V
+5VR
+3.3VR
Reader
controller
PCB
+5V
+3.3V
Image
Processor
PCB
+24VR
+24V
+5VR
+3.3VR
DC
SW2
controller
PCB
SW3
+24VR
+5VR
+3.3VR
HVT
PCB
+24V
F-9-6
5V 5VR
5.1V 5.1V
+3%, -4% +3%, -4%
1.0A 1.0A
4.0A 4.0A
8.0V 8.0V
Option
- Finisher
- Cassette feeding
module
Motor
Sensor
DADF
Control panel
FAX board
Laser unit
Motor
Clutch
Solenoid
Fan
Sensor
Inner2waytray
Duplex unit
3.3V 3.3VR
3.4V 3.4V
+3%, -3% +3%, -3%
2.0A 0.75A
4.0A 4.0A
5.5V 5.5V
Chapter 9
0018-1310
0018-1311
9-3