Oki OKIPAGE 10ex Maintenance Manual page 221

3.12 Power Supply Board
(1) Low voltage power supply
An AC power from an inlet is input to a transformer via fuses, AC switch and noise filter and
then lowered to a 32 VAC power and a 10 VAC power. The 32 VAC power is converted to
a +38 VDC output through a rectifying/smoothing circuit. A +5 VDC output is derived from the
resultant +38 VDC power through a regulation circuit. The 10 VAC power is converted to a
+8 VDC output and a -8 VDC output through a rectifying/smoothing circuit.
ACIN
L F1
FG
N
Fuse Ratings
AC Input
120 V
Fuse
F1 125 V 6.3 A
125 V 1.6 A
F2
125 V 3.15 A
F3
(2) High voltage power supply
The +5 VDC power supplied to the high voltage power supply unit via the cover open
microswitch as source voltage. The high voltage power supply unit supplies necessary
voltage for electro-photography print to output terminals CH, DB, SB, TR, and CB according
to a control signal from the CPU. The table on the next page shows the relationship between
control signals and high voltage outputs.
40990901TH Rev.1
Power supply board
CN1
F2
1
Thermal Fuse
Filter
2
Circuit
230 V
AC Transformer
250 V 5 A
–
250 V 2.5 A
SCLK
SQCR
DATA IN
DATA OUT
CPU
TRSEL 3
TRSEL 4
TRSEL 5
CN2
F3
+38V
Smoothing
1, 2
Circuit
+5V
3, 4
Stabilizing
Circuit
±8V
6
Rectifying/
Smoothing
Circuit
5
+3.3 V
Generating
Circuit
+5V
Cover Open Switch
High Voltage
Power Supply
Unit
CN3
+38 V 17, 18
+5 V 11, 12
0 V 9, 15, 16
+8 V 24
-8 V 22
13, 14
+3.3 V
CH
DB
SB
TR
CB
24 /