Low-Voltage Power Supply - Canon LBP253 SM Manual

■ Failure Detection
Failure Point
Main Motor
Main Fan

Low-voltage Power Supply

■ Outline
The low-voltage power supply converts AC power from the power receptacle into DC power to cover the DC loads.
Block diagram of the Low Voltage Power Supply is shown below.
Noise filter
Protection
■ Protective function
The low-voltage power supply has a protective function against overcurrent and overvoltage to prevent failures in the power
supply circuit. If there flows an overcurrent or an overvoltage, the system automatically cuts off the output voltage.
If the DC power is not being supplied from the low-voltage power supply, the protective function may be running. In such case,
turn off the power switch and unplug the power cord. Do not plug in the power cord or turn the power switch on again until the
root cause is found.
In addition, two fuses in the low-voltage power supply protect against overcurrent.
If overcurrent lows into the AC line, the fuse blows and cuts off the power distribution.
Low-voltage power supply
Noise
filter
Fuse
(FU101)
Fuse (FU102)
+24V generation
circuit
+5V
generation
circuit
circuit
+3.3V
generation
circuit
Error Code
E014
E805
Engine controller
Fixing
control
circuit
High-voltage
power supply
DOOR
SNS
+24V
PWSV
SWON
+5V
+3.3V
DC controller
32
Cause of Failure
In the case that the speed of motor does not
reach the specified speed after the specified
time has passed since the startup of the
Main Motor.
In the case that the fan has been locked
continuously for the specified period of time
since the startup of the Main Fan Motor.
Fixing unit
+24P1
FET
+24U
Door switch
(SW301)
Power switch
(SW1001)
2. Technology