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FS-1010
(4) Bias board
The bias board 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 board, power
supply, and the toner sensor.
Figure 4-3-9 Bias board circuit block diagram
Developing
roller
Bias board (KP-884)
Engine board
Regist-
ration
sensor
Developing bias
output circuit
FANL
FAN
FANH
PAPERN
SWIN
RESIT
TONER
SENPOW
HVCLK
RTHVDR, HVISEL
PSEL1, PSEL2
EXTIN, THERM
Casette
switch
Paper
sensor
5 V DC
TONER
Toner
sensor
275 V DC + AC
+5 V
+5 V
24 V DC
+24 V
5 V DC
+5 V
HEATN, ZCROSS
High voltage
board
Power supply
board
+5 V
24 V DC
+24 V
+24 V
+24 V