Kyocera FS-1050 Service Manual - Page 86

Bias board, Bias board circuit block diagram

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(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. Bias board (KP-884) Toner sensor Power supply board High voltage board +5 V +24 V +5 V TONER +5 V +24 V Registration sensor 5 V DC 24 V DC +5 V +24 V Casette switch TONER 5 V DC 24 V DC SENPOW RESIT SWIN Paper sensor PAPERN RTHVDR, HVISEL PSEL1, PSEL2 FAN 275 V DC + AC Developing roller +24 V Developing bias output circuit FANL FANH HEATN, ZCROSS EXTIN, THERM HVCLK Engine board Figure 4-3-9 Bias board circuit block diagram 4-27 FS-1050

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4-27
FS-1050
(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