Olivetti d-Copia 284MF Service Manual page 235

2-3 Operation of the PWBs
2-3-1 Power source PWB
AC input
1 1
YC107
YC104
SW101
Y111030-4
Power source PWB
Main power switch
Figure 2-3-1 Power source PWB block diagram
1
1
1
YC106 YC105
YC108
1
YC103
Figure 2-3-2 Power source PWB silk-screen diagram
Zero cross
signal circuit
Switching
regulator
circuit
Fuser heater
lamp control
circuit
Fuser thermistor
Fuser
heater lamp
Fuser thermal cutout
1
YC102
Service Manual
+24V1
Scanner
PWB
+24V1
Power
FAN
source
fan motor
+24V1
Left
cooling
FAN
fan motor
FAN
+24V1
+24V2
Interlock
switch
SLEEP
ZCROSS
HEATN
+3.3V2
THERM
Fuser unit
2JN
1
YC101
2-3-1