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15. Playback Sensitivity Check (DECK 1 and DECK 2)
Requirement
•
Measuring instrument: Millivoltmeter
Test tape: TTA-200(400Hz)
Test points: 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, and play back.
3) Check that the output level is ranged within 280mV
±
3dB.
4) Apply the above step 2 and 3 to DECK 2.
16. Record/Playback 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 points: SFR451(LCH), SFR452(RCH)
1) Connect the CH1 of 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) to DECK 2, and record 1kHz from AUX.
4) Adjust the attenuator so that the output levels from TP8 and TP9 becomes 10mV.
5) Record 1kHz and 8kHz alternatively.
6) Adjust SFR451 (LCH) and 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. Playback Sensitivity Check (DECK 2)
Requirement
• Measuring instruments: Millivoltmeter, Audio signal generator (low frequency generator), Attenuator
Test tape: TTA-602(NORMAL)
Test point: TP8(LCH),TP9(RCH)
Input point: AUX(1KHz)
1) Insert the test tape (TTA-602) to DECK 2 and record 1kHz signal from AUX.
2) Adjust the attenuator so that the output levels of TP8 (LCH) and TP9 (RCH) becomes 100mV.
3) Play back 1KHz signal, and check that the output level is ranged within -2dB
±
2dB compared to the output level during recording.
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