Canon MF8580Cdw Service Manual page 41

2
Technical Overview > Controller System > Controls > Low-Voltage Power Supply Control
■ Low-Voltage Power Supply Control
This circuit converts AC voltage input from the power supply receptacle through the fixing
power supply into DC power supply and supplies it to each load.
See the figures below for low-voltage / fixing power supply block diagrams.
• Low-voltage power supply: generates DC power supply required in the printer.
• Fixing power supply: supplies AC power supply to the low-voltage power supply and control
the fixing heater temperatures.
The low-voltage power supply is actuated when the AC power supply is attached to the inlet
and the power switch is turned on. The AC power supply supplied through the fixing power
supply is converted to + 24V and + 3.3V of the DC power supply in the low-voltage power
supply before supplied to the printer engine.
• MF8500 Series
AC input
Fixing Power Supply
Fuse
FU1201
Noise Filter
Power
Switch
SW1
Fuse Fuse
FU1101 FU1102
Noise Filter
Rectifying
Circuit
+24V
Generation
Circuit
Protection
Circuit
+3.3V
Generation
Circuit
2 Technical Overview > Controller System > Controls > Low-Voltage Power Supply Control
Fixing
Control
Circuit
Low-voltage Power
DC
Supply (all night)
Controller PCB
Frequency
ZEROX
Detecting
Circuit
24V DCON
24V REM
3.3V DCON
24V
24S_ON
Main
DCON_ON
Controller PCB
3.3V
• MF8200 Series
AC input
Fuse
FU201
Fuse Fuse
FU101 FU102
Noise Filter
Rectifying
Circuit
+24V
Generation
Circuit
Protection
Circuit
+3.3V
Rectifying
Generation
Circuit
Circuit
Protection
Circuit
Power Supply Assembly
SW1001 : Product supporting automatic shutdown (MF8230)
F-2-11
Fixing Power Supply
Noise
Fixing
Filter
Control
Circuit
Low-voltage Power Supply
(non-all night)
Low-voltage Power
Supply (all night)
24V DCON
24V REM
3.3V DCON
Power Switch DCON_ON
Control Circuit
24V
24S_ON
3.3V
Power Switch
SW1,SW1001
2-12
DC
Controller PCB
Main
Controller PCB
F-2-12
2-12