Bias Pwb - Kyocera KM-1820 Service Manual

2-3-4 Bias PWB

The bias PWB contains the developing bias output circuit, registration sensor, paper empty sensor, and the cassette switch.
It also provides a liaison connection to the high voltage PWB, power supply, and the toner sensor.
+24V2
+24V1
+5V
Power
supply
High
PWB
voltage
PWB
Developing
YC304 SW301
1 3
+5V
Toner
TONER
sensor
+24V2
+24V2
+5V
+5V
FAN
275 V DC + AC
roller
Figure 2-3-11 Bias PWB circuit block diagram
T301
Figure 2-3-12 Bias PWB silk-screen diagram
Bias PWB
TONEREPY
+24V2
SLEEP
FET
+24V3
+24V3
+5V
Regist-
RESIT
ration
sensor
Casette
SWIN
switch
Paper
sensor
RTHVDR,
HVISEL, PSEL1
FAN1
FAN2
HEATN, ZCROSS, SLEEPN
EXTIN, THERM
+24V3
HVCLK
Developing bias
output circuit
U301
VR301
2GM
Engine PWB
2-3-19