Aiwa NSX-VC38, Руководство по обслуживанию

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18. REC/PB Frequency Response Adjustment (DECK 2)
Settings : • Test tape : TTA–602
• Test point : TP8 (Lch), TP9 (Rch)
• Input signal : 1kHz / 8kHz
(–20VU / –26dBV)
• Adjustment location : SFR451 (Lch)
SFR452 (Rch)
Method : Apply a 1kHz signal and REC mode. Then adjust OSC
attenuator so that the output level at the TP8, TP9
becomes 5.5mV ~ 9.5mV. Record and play back the
1kHz and 8kHz signals and adjust SFRs so that the
output of the 8kHz signals becomes 0dB
±
0.5dB with
respect to that of the 1kHz signal.
19. REC/PB Sensitivity Check (DECK 2)
Settings : • Test tape : TTA–602
• Test point : TP8 (Lch), TP9 (Rch)
• Input signal : 1kHz (0VU / –6dBV)
Method : Apply a 1kHz signal and REC mode. Then adjust
OSC attenuator so that the output level at TP8, TP9
becomes 55mV ~ 95mV. Record and play back
the 1kHz signals and check that the output is
–2dB
±
3.5dB.
< FRONT SECTION >
20.
µ
-CON OSC Adjustment
Settings : • Test point : TP11 (KEY-SCAN), (GND)
• Adjustment location : L951
Method : Connect a frequency counter across TP11 and GND via
a CR network filter as shown below.
Then adjust L951 so that the test point becomes
184.94Hz
±
0.18Hz.
10
µ
F
TP11(KEY-SCAN)
(GND)
10
µ
F
1k
Ω
1k
Ω
1SS133
0.1
µ
F 47k
Ω
TO
FREQUENCY
COUNTER
< CR NETWORK FILTER >