Aiwa NSX-D70 Service Manual page 41

15. Playback Sensitivity Check (DECK1 and DECK2)
Requirements
• Measuring instrument: Millivoltmeter
Test tape: TTA-200(400Hz)
Test points: TP8(Lch), TP9(Rch)
1) Connect CH1 of the millivoltmeter to TP8 (Lch) and CH2 to TP9 (Rch).
2) Insert the test tape (TTA-200) to DECK1 and play back.
3) Check that the output level is ranged within 140mV±3dB.
4) Apply the above steps, 2) and 3) to DECK2.
16. Record/Playback Frequency Response Adjustment (DECK 2)
Requirements
• Measuring instrument: Millivoltmeter, Audio signal
Test tape: TTA-602(NORMAL)
Test points: TP8(Lch), TP9(Rch)
Input point: AUX(1KHz / 8KHz)
Adjustment points: SFR451(Lch), SFR452(Rch)
1) Connect CH1 of the millivoltmeter to TP8 (Lch) and CH2 to TP9 (Rch).
2) Connect the output of the oscillator to the attenuator, and then the attenuator to AUX of the unit.
3) Insert the test tape (TTA-602) to DECK2, and record 1KHz signal from AUX.
4) Adjust the attenuator so that the output levels at TP8 and TP9 are ranged at 10mV.
5) Record 1KHz and 8KHz alternatively.
6) Play back the tape. Adjust SFR451 (Lch)/SFR452 (Rch) so that the playback output level of 8KHz is ranged within 0±1dB
compared to the playback output level of 1KHz as reference.
17. Record/Playback Sensitivity Check (DECK2)
Requirements
• Measuring instrument: Same as the above, 16
Test tape: TTA-602(NORMAL)
Test point: TP8(Lch),TP9(Rch)
Input point: AUX(1KHz)
1) Insert the test tape (TTA-602) to DECK2, and record 1KHz signal from AUX.
2) Adjust the attenuator so that the output levels at TP8 and TP9 are 100mV.
3) Play back 1KHz, and check that the output level is ranged within -2dB±3.5dB compared to the recording output level.
oscillator (low frequency
oscillator), Attenuator
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