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15. Playback Sensitivity Check (DECK 1, DECK 2)
Requirement
•
Measuring instrument: Millivoltmeter
Test tape: TTA-200 (400Hz)
Test points: TP8 (Lch), TP9 (Rch)
1) Connect the CH1 of the Millivoltmeter to TP8 (Lch) and the CH2 to TP9 (Rch).
2) Insert the test tape (TTA-200) into DECK 1 and play it back.
3) Check that the output level is within 280mV ± 3dB.
4) Apply the above steps 2 and 3 to DECK 2.
16. Playback / Record Frequency Adjustment (DECK 2)
Requirement
•
Measuring instruments: Millivoltmeter, Audio signal
generator (low frequency generator), Attenuator
Test tape: TTA-602 (NORMAL)
Test points: TP8 (Lch), TP9 (Rch)
Input point: AUX (1kHz / 8kHz)
Adjustment locations: SFR451 (Lch), SFR452 (Rch)
1) Connect the CH1 of the Millivoltmeter to TP8 (Lch) and the CH2 to TP9 (Rch).
2) Connect the output from the generator to the attenuator and the attenuator to AUX of the unit.
3) Insert the test tape (TTA-602) into DECK 2 and record the 1kHz signal from AUX.
4) Adjust the attenuator so that the output levels from TP8 and TP9 become 10mV.
5) Record 1kHz and 8kHz alternatively.
6) Adjust SFR451 (Lch) and SFR452 (Rch) so that the playback output level of 8kHz is within 0 ± 1dB compared to the playback
output level of 1kHz as reference.
17. Playback / Record Sensitivity Check (DECK 2)
Requirement
•
Measuring instrument: As instructed in 18
Test tape: TTA-602 (NORMAL)
Test points: TP8 (Lch), TP9 (Rch)
Input point: AUX (1kHz)
1) Insert the test tape (TTA-602) into DECK 2 and record the 1kHz signal from AUX.
2) Adjust the attenuator so that the output levels of TP8 and TP9 become 100mV.
3) Play back the 1kHz signal, and check that the output level is within - 2dB ± 2dB compared to the output level during recording.
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