
-36-
17. Playback Sensitivity Check (DECK 1 and DECK 2)
Requirements
•
Measuring instrument: Millivoltmeter
Test tape: TTA-200 (400 kHz)
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 DECK 1 and play back.
3) Check that the output level is ranged within 110 mV
±
3 dB.
4) Apply the above steps, 2) and 3) to DECK 2.
18. Record/Playback Frequency Response Adjustment (DECK 2)
Requirements
•
Measuring instrument: Millivoltmeter, Audio signal
oscillator (low frequency
oscillator), Attenuator
Test tape: TTA-602 (NORMAL)
Test points: TP8 (Lch), TP9 (Rch)
Input point: AUX (1 kHz / 8 kHz)
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 DECK 2, and record 1 kHz signal from AUX.
4) Adjust the attenuator so that the output levels at TP8 and TP9 are ranged at 10mV.
5) Record 1 kHz and 8 kHz alternatively.
6) Play back the tape. Adjust SFR451 (Lch)/SFR452 (Rch) so that the playback output level of 8kHz is ranged within 0
±
1 dB
compared to the playback output level of 1 kHz as reference.
19. Record/Playback Sensitivity Check (DECK 2)
Requirements
•
Measuring instrument: Same as the above, 16
Test tape: TTA-602 (NORMAL)
Test point: TP8 (Lch),TP9 (Rch)
Input point: AUX (10 kHz)
1) Insert the test tape (TTA-602) to DECK 2, and record 1 kHz signal from AUX.
2) Adjust the attenuator so that the output levels at TP8 and TP9 are 100 mV.
3) Play back 1kHz, and check that the output level is ranged within 0 dB
±
2.5 dB compared to the recording output level.
ELECTRICAL ADJUSTMENT -6/7
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Summary of Contents for NSX-R20 - SERVICE
Page 39: ... 39 LCD DISPLAY 1 1 GRID ASSIGNMENT ANODE CONNECTION PIN CONNECTION d u p a t o r ...
Page 40: ... 40 IC BLOCK DIAGRAM 1 3 IC BD3881FV IC NJM7806FA d u p a t o r ...
Page 41: ... 41 IC BLOCK DIAGRAM 1 3 IC LA1845N A IC LC7213D N d u p a t o r ...
Page 42: ... 42 IC BLOCK DIAGRAM 3 3 IC BU1920FS d u p a t o r ...
Page 53: ...2 11 IKENOHATA 1 CHOME TAITO KU TOKYO 110 8710 JAPAN TEL 03 3827 3111 0251431 d u p a t o r ...