6 - 26
ACIN
Filter
Circuit
CN1 CN2
Power supply 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
11, 12
9, 15, 16
24
22
Thermal Fuse
F2
F1
125 V 2.5A
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
▼
A
▼
• Take the measurement of the following voltages at connector CN2 on the power supply
board:
Voltage between pins 1 and 3: ... about 28 V AC
Voltage between pins 5 and 6: ... about 10 V AC Are the voltages normal?
• Yes Is fuse F3 on the power supply board open?
• No Replace the power supply board.
▼
• Yes Replace fuse F3 (if it blows again, check the resistance of the registration
and drum motors (see 7.3). If the resistance is wrong, replace motors or
replace the power supply board or Main Control PCB).
▼
• No Is the AC input voltage output between pins 1 and 2 of connector CN1 on the
power supply board normal?
• Yes Replace the AC transformer.
▼
• No Is fuse F1 or F2 on the power supply board open?
• No Replace the power supply board.
▼
• Yes Replace open fuse F1 or F2 (if is opens again, replace the power supply
board).
