Advertisement
ADJUSTMENT PROCEDURE
DC OFFSET ADJUSTMENT
[When]
1. Exchange the parts on the POWER AMPLIFIER PC board (NACLD-9283).
2. Exchange the POWER AMPLIFIER PC board ass'y (NACLD-9283).
3. Exchange the power trans (T911).
<Note>
No signal and No load.
[Procedure]
1. Connect the DC voltmeter to the SPEAKER A terminals.
2. Connect the power cord to the wall outlet and press the POWER switch to unit is power on.
3. Speaker selector : SPEAKER A, Volume : MIN.
4. Adjust the trimming resistor R5022 (Lch) and R5021 (Rch) so that the reading of DC voltmeter becomes DC 0 +/-10 mV.
Refer to <Fig-1> .
5. Wait for 3 minutes.
6. Re-adjust the trimming resistor R5022 (Lch) and R5021 (Rch) so that the reading of DC voltmeter becomes DC 0 +/-10 mV.
7. Press the POWER switch to unit is power off and Disconnect the power cord from the wall outlet.
8. Disconnect the DC voltmeter.
<Fig-1>
Front side
R5021 (Rch)
Power Amplifier PC board
NACLD-9283
R5022 (Lch)
A-9355
Advertisement
