Aiwa NSX-SZ30 Service Manual page 21

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B FRONT C.B
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18
D DECK C.B<HA>
12
FWD
13
TE
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< DECK SECTION >
12. Tape Speed Adjustment (DECK 2)
Settings : • Test tape : TTA–100
• Test point : TP8(Lch), TP9(Rch)
• Adjustment location : SFR1
Method : Play back the test tape and adjust SFR1 so that the
frequency counter reads 3000Hz ± 5Hz (FWD) and
FWD SPEED ± 45Hz (REV).
13. Head Azimuth Adjustment (DECK 1, DECK 2)
Settings : • Test tape : TTA–330
• Test point : TP8(Lch), TP9(Rch)
• Adjustment location : Azimuth adjustment screw
Method : Play back (FWD) the 8kHz signal of the test tape and
adjust screw so that the output becomes maximum.
Next, perform on REV PLAY mode.
14. PB Frequency Response Check (DECK 1, DECK 2)
Settings : • Test tape : TTA–330
• Test point :TP8(Lch), TP9(Rch)
Method : Play back the 315Hz and 8kHz signals of the test tape
and check that the output ratio of the 8kHz signal with
respect to that of the 315Hz signal is within 5.0dB.
15. PB Sensitivity Check (DECK 1, DECK 2)
Settings : • Test tape : TTA–200
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• Test point : TP8(Lch), TP9(Rch)
Method : Play back the test tape and check that the output level of
the test point is 110mV ± 3.0dB.
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D984
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TP11
IC901
L951
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SFR1
DECK–1 P HEAD<HA>
DECK–2 R/P/E HEAD
REV
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8
GND
< CR NETWORK FILTER >
10µF 10µF
TP11
(KEY-SCAN)
(GND)
D DECK C.B<HR>
FWD
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16. REC/PB Frequency Response Adjustment (DECK 2)
Settings : • Test tape : TTA–602
• Test point : TP8(Lch), TP9(Rch)
• Input signal : 1kHz / 8kHz (LINE IN)
• Adjustment location : SFR451 (Lch)
Method : Apply a 1kHz signal and REC mode. Then adjust OSC
attenuator so that the output level at the TP8, TP9
becomes -20VU (-26dBV). Record and play back the
1kHz and 8kHz signals and adjust SFRs so that the
output of the 8kHz signals becomes 1.5dB ± 0.5dB with
respect to that of the 1kHz signal.
17. REC/PB Sensitivity Check (DECK 2)
Settings : • Test tape : TTA–602
• Test point : TP8(Lch), TP9(Rch)
• Input signal : 1kHz (LINE IN)
Method : Apply a 1kHz signal and REC mode. Then adjust OSC
attenuator so that the output level at TP8, TP9 becomes
0VU (-6dBV). Record and play back the 1kHz signals
and check that the output is -1dB ± 3.5dB.
< FRONT SECTION >
18. µ-con OSC Adjustment
Settings : • Test point : TP11(KEY-SCAN), GND
co
• Adjustment location : L951
Method : Connect a frequency counter across TP11 and GND via
.
a CR network filter. Then adjust L951 so that the test
point becomes 184.94Hz ± 0.18Hz.
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1kΩ 1SS133
1kΩ 0.1µF 47kΩ
SFR1
DECK–1 P HEAD<HR>
REV
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SFR452 (Rch)
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TO
FREQUENCY
COUNTER
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