Kyocera FS-1920 - Power Supply Unit

2FP/2FY/2FR
2-3-8
2-3-3 Power supply unit
The power supply unit provides the AC power input and DC power and outputs. The high voltage bias generator circuit is
mounted on a separate board. A simplified schematic diagram is shown below.
Figure 2-3-4 Power supply unit circuit block diagram
FET
Switching
control
circuit
Zero cross
signal
generation
circuit
Power
switch
Current
fuse
Noise
filter
circuit
Transformer
24 V DC
rectifier/
smoothing
circuit
Photo-
coupler
Photo-
coupler
Photo-
Triac
Triac
ZCROSS
FDDR
EXITPAP*
FDFUL
THERM
HEATON*
FUDR
+24V1
+24V3
+5V1
GND
GND
Heater
lamp
AC
input
Rectifier
circuit
5 V DC
rectifier/
smoothing
circuit
Power supply unit
Fuser
board
Interlock
switches
Thermal
cutout
Thermistor
Paper full
sensor
Exit sensor
Face up/down
solenoid
+
Over
voltage/
current
detection
circuit
+5V1
+24V3
24 V DC
regulator
circuit
+24V1 +24V2
ECOPOWER
Engine
board