Oki 10i, Maintenance Manual

Page: 102 / 210

102
• Yes End
1
-1
• Take the measurement of the following voltage readings at connector CN2 on the power supply/
sensor board:
Voltage between Pins 1 and 3: ... about 40 V AC
Voltage between Pins 5 and 6: ... about 9.2 V AC
Are the voltages within the normal range?
• Yes Is fuse F3 on the power supply/sensor board blown?
• No Replace the power supply/sensor board.
• Yes Replace fuse F3 (if it blows again, check the resistance of the registration and main/
drum motors. If it is faulty, replace motors or replace the power supply/sensor board or
main control board).
• No Is the AC input voltage output between Pins 1 and 2 of connector CN1 on the power
supply/sensor board normal?
• Yes Replace the AC transformer.
• No Is fuse F1 or F2 on the power supply/sensor board blown?
• No Replace the power supply/sensor board.
• Yes Replace blown fuse F1 or F2 (if is blows again, replace the power supply/sensor board).
ACIN
Filter
Circuit
CN1 CN2
Power supply/sensor board
F1
L
N
FG
F2
1
2
F3
1, 2
3, 4
+30 V
Smoothing
Circuit
+5 V
Stabilizing
Circuit
+30 V
+5 V
0 V
CN3
6
±
8 Rectifying/
Smooting
Circuit
5
+8 V
-8 V
AC Transformer
Fuse Ratings
120 V 230 V
F3
AC Input
Fuse
17, 18
12
9, 15, 16
24
22
Thermal Fuse
F2
F1
125 V 3.15A
125 V 1.6 A
125 V 6.3 A
250 V 2.5A
–
250 V 5 A
Figure 6-1 Low-voltage Power Supply Block Diagram