Aiwa NSX-DST717 Service Manual page 40

ADJUSTMENT
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< TUNER SECTION >
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1. Clock Frequency Check
Settings : • Test point :
Method : Set to AM 1710kHz and check that the test
point is 2160kHz ± 45Hz.
2. AM VT Check
Settings : • Test point :
Method : Set to AM 1710kHz and AM 530kHz and check
that the test point is less than 8.5V(1710kHz)
and more than 0.6V(530kHz)
3. AM Tracking Adjustment
Settings : • Test point : TP9(Lch), TP10(Rch)
• Adjustment location :
L951(1/3)........................ 999kHz
Method : Set to AM 999kHz and adjust
L951(1/3) so that the test point is maximum.
4. FM VT Check
Settings : • Test point :
Method : Set to FM 108.0MHz and check that the test
point is less than 8.0V.
Set to FM 87.5MHz and check that the test
point is more than 0.5V.
5. FM Tracking Check
Settings : • Test point :
Method : Set to FM 98.0MHz and check that the test point
is less than 9.0dBµV.
6. AM IF Adjustment
Settings : • Test point :
TE
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• Adjustment location : L802
• Input level :
Method : Adjust L802 so that the output becomes maximum.
7. DC Balance / Mono Distortion Adjustment
Settings : • Test point :
• Adjustment location : L801
• Input level :
Method : Set to FM 98.0MHz and adjust L801 so that the
voltage between TP4 and TP5 becomes 0V ± 300mV.
Next, check that the distortion to minimum.
< DECK SECTION >
1. Tape Speed Adjustment (DECK 2)
Settings : • Test tape :
• Test point :
• Adjustment location : SFR1
Method : Play back the test tape and adjust SFR1 so that
the frequency counter reads 3000Hz ± 5Hz(FWD) and
± 45Hz(REV) with respect to forward speed.
2. Head Azimuth Adjustment (DECK 1, DECK 2)
Settings : • Test tape :
• Test point :
www
• Adjustment location : Head azimuth
adjustment screw
Method : Play back the 10kHz signal of the test tape
and adjust screw so that the output becomes
.
maximum. Next, perform on each FWD PLAY
and REV PLAY mode.
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TP6 (CLK)
TP3 (VT)
TP3 (VT)
TP9(Lch), TP10(Rch)
TP9(Lch), T10(Rch)
Variable
TP4, TP5
(DC Balance)
TP9(Lch), TP10(Rch)
(Distortion)
60dBµV
TTA–100(3kHz)
TP7(Lch), TP8(Rch)
TTA–300 (315/10kHz)
TP7(Lch), TP8(Rch)
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3. PB Frequency Response Check (DECK 1, DECK 2)
Settings : • Test tape :
• Test point :
Method : Play back the 315Hz and 10kHz signals of the
test tape and check that the output ratio of the
10kHz signal with respect to that of the 315Hz
signal is within 0 ± 3dB.
4. REC/PB Frequency Response Adjustment (DECK 2)
Settings : • Test tape :
• Test point :
• Input signal :
• Adjustment location :
Method : Apply a 1kHz signal and REC mode. Then adjust OSC
attenuator so that the output level at the test points
becomes 9.0mV. Record and play back the 1kHz and
10kHz signals and adjust SFRs so that the output level of
the 10kHz signals becomes 0dB ± 0.5dB with respect to
that of the 1kHz signal.
5. REC/PB Frequency response Check (DECK 2)
Settings : • Test tape :
• Test point :
• Input signal :
Method : Apply a 1kHz signal and REC mode. Then
Adjust OSC attenuator so that the output level
at the test points becomes 9.0mV. Record and
play back the 1kHz and 10kHz signals and
check that the output is 0dB ± 2dB.
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6. REC/PB Sensitivity Check (DECK 2)
Settings : • Test tape :
• Test point :
• Input signal : 1kHz (LINE IN)
Method : Apply a 1kHz signal and REC mode. Then adjust OSC
attenuator so that the output level at the test points
becomes 90mV. Record and play back the 1kHz signal
and check that the output is -1dB ± 3dB.
<FRONT SECTION>
7. µ-CON OSC Adjustment
Settings : • Test point :
• Adjustment location :
Method : Insert AC plug with pressing TUNER function key.
Adjust L101 so that the frequency across the test point
becomes 208.8Hz ± 0.2Hz.
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TTA–300 (315/10kHz)
TP7(Lch), TP8(Rch)
TTA–602 (Normal)
TP7(Lch), TP8(Rch)
1kHz / 10kHz (LINE IN)
SFR351 (Lch)
SFR352 (Rch)
TTA-615 (CrO )
2
TP7(Lch), TP8(Rch)
1kHz/10kHz (LINE IN)
0 5 8 2 9 9 4 2 8
TTA-615 (CrO )
2
TP7(Lch), TP8(Rch)
TP1 (K-SCAN),
L101
m
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