DTA-9.4
-B
GND
+B
ADJUSTMENT PROCEDURES-1
POWER SUPPLY VOLTAGE ADJUSTMENT
When adjustment?
Replace the NAPS-7789 (secondary power supply PC board)
Notes
No load and No signal input.
How to adjustment?
1. Remove the top cover.
2. Connect a DC volt meter to the P108 Test point on the NADG-7313)
3. Connect the power supply card to a wall outlet.
4. Power On the unit.
5.
Adjust the R139 trimming resistor so that the reading of DC voltmeter becomes standard value.
Standard value : 53.6 0.4 V
6. Wait for five minutes.
7. Check the voltage of P108 again. If reading of a voltmeter is outside a standard, will adjust again.
8. Power Off.
9. Remove a DC voltmeter.
Measuring point
Adjustment point
R139 Trimming resistor
DC voltmeter
Front side
w
w
w
.
x
i
a
o
y
u
1
6
3
.
c
o
m
Q
Q
3
7
6
3
1
5
1
5
0
9
9
2
8
9
4
2
9
8
T
E
L
1
3
9
4
2
2
9
6
5
1
3
9
9
2
8
9
4
2
9
8
0
5
1
5
1
3
6
7
3
Q
Q
TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
http://www.xiaoyu163.com
http://www.xiaoyu163.com
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