Aiwa NSX-R50 Service Manual page 30

17. Playback Sensitivity Check (DECK 1, DECK 2)
Requirements
* Measuring instrument: Millivoltmeter
Test tape: TTA-200 (400 Hz)
Test point: TP8 (Lch), TP9 (Rch)
(1) Connect the CH1 of millivoltmeter to TP8 (Lch) and the CH2 to TP9 (Rch).
(2) Insert the test tape (TTA-200) to DECK 1 to playback.
(3) Check that the output level is ranged within 1000 mV ± 3 dB.
(4) Apply the above steps 2 and 3 to DECK 2.
18. Playback/Record Frequency Response Adjustment (DECK 2)
Requirements
* Measuring instruments: Millivoltmeter
Audio signal oscillator (low-frequency oscillator)
Attenuator
Test tape: TTA-602 (NORMAL)
Test point: TP8 (Lch), TP9 (Rch)
Input point: AUX (1 kHz / 8 kHz)
Adjustment point: SFR451 (Lch), SFR452 (Rch)
(1) Connect the CH1 of millivoltmeter to TP8 (Lch) and the CH to TP9 (Rch).
(2) Connect the output terminal of oscillator to attenuator, and then attenuator to AUX of the unit.
(3) Insert the test tape (TTA-602) to DECK 2, and record the 1 kHz signal form AUX.
(4) Adjust the attenuator so that the output levels of TP8 and TP9 become 80 mV.
(5) Record 1 kHz and 8 kHz alternately.
(6) Adjust SFR451 (Lch) and SFR452 (Rch) so that the playback output level of 8 kHz is ranged within 0 ± 0.5 dB compared to the
playback output reference level of 1 kHz.
19. Playback/Record Sensitivity Check (DECK 2)
Requirements
* Measuring instrument: Same as Item 18.
Test tape: TTA-602 (NORMAL)
Test point: TP8 (Lch), TP9 (Rch)
Input point: AUX (1 kHz)
(1) Insert the test tape (TTA-602) to DECK 2, and record the 1 kHz signal from AUX.
(2) Adjust the attenuator so that the output levels of TP8 and TP9 become 800 mV.
(3) Playback 1 kHz, and check that the output level is ranged within -1 dB ± 3.5 dB compared to the output level during recording.
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AUDIO SIGNAL
GENERATOR
OUTPUT
(1KHz, 1V)
– 30 –
ATTENUATOR
SET
AUX(L)
INPUT
OUTPUT
AUX(R)
AC MILLIVOLTMETER
CH1 CH2
TP8
TP9