Kyocera FS C5020N - Color LED Printer Service Manual page 177

2-3 Operation of the PWBs
2-3-1 Power supply PWB
Power Current
AC
switch
fuse
input
Fuser
heater
lamp 1
Fuser
thermostat 1
Fuser
heater
lamp 2*
Fuser
thermostat 2*
Fuser
thermistor 1
Fuser
thermistor 2*
*: 16 ppm printer only.
Power supply PWB
Rectifier
circuit
Noise
filter
circuit
+
Zero cross
Switching control
signal
circuit (IC1)
generation
circuit
Triac
(TRA1)
Triac
(TRA2)
Figure 2-3-1 Power supply PWB block diagram
Transformer
(T1)
24 V DC
rectifier/
FET
smoothing
(Q1)
circuit
(Q2)
5 V DC
rectifier/
smoothing
circuit
DC-DC
coverter
circuit
Photo-
coupler
(PC4)
Photo-
coupler
(PC5)
Photo-
coupler
(PC3)
Photo-
coupler
(PC1)
Photo-
coupler
(PC2)
2F3/2F4
Engine
controller
PWB
+24V1
GND
+5V1
GND
+3.3V1
Over
voltage/
current
detection
circuit
ZCROSS
HEAT1DR
HEAT2DR
TH1
TH2
EXITPAPN
FUDR
FDDR
2-3-1