Operation Of The Pwbs - Kyocera FS-C5015N Service Manual

2-3-1

Operation of the PWBs

(1) Power supply PWB
AC
input
Fuser
heater
lamp 1
Fuser
thermostat 1
Fuser
heater
lamp 2*
Fuser
thermostat 2*
Fuser
thermistor 1
Fuser
thermistor 2*
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Power Current
switch fuse
Rectifier
circuit
Noise
filter
circuit
Zero cross
Switching control
signal
circuit (IC1)
generation
circuit
Triac
(TRA1)
Triac
(TRA2)
Figure 2-3-1Power supply PWB block diagram
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Power supply PWB
Transformer
(T1)
24 V DC
rectifier/
+
FET
smoothing
(Q1)
circuit
(Q2)
5 V DC
rectifier/
smoothing
circuit
DC-DC
converter
circuit
Photo-
coupler
(PC4)
Photo-
coupler
(PC5)
Photo-
coupler
(PC3)
Photo-
coupler
(PC1)
Photo-
coupler
(PC2)
2HJ/2HK-1
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