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
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