Aiwa NSX-AJ80, Service Manual

Page: 38 / 47

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1. Clock frequency Check
Settings : • Test point : TP2
Method : Set to AM 1710kHz and check that the test point is
2160kHz
±
45Hz.
2. AM VT Check
Settings : • Test point : TP1 (VT)
Method : Set to AM 1710kHz, 530kHz and check that the test
point is less than 8.5V (1710kHz) and more than
0.6V (530kHz).
3. FM VT Check
Settings : • Test point : TP1 (VT)
Method : Set to FM 87.5MHz, 108.0MHz and check
that the test point is more than 0.5V (87.5MHz) and
less than 8.0V (108.0MHz).
4. AM Tracking Adjustment
Settings : • Test point : TP5(Lch), TP6(Rch)
• Adjustment location :
L951(1/3) ...................................... 1000kHz
Method : Set to AM 1000kHz and adjust L951(1/3) to MAX.
5. FM Tracking Check
Settings : • Test point : TP5(Lch), TP6(Rch)
Method : Set to FM 98.0MHz and check that the test point is
less than 9dB
µ
V.
6. AM IF Adjustment
Settings : • Test point : TP5(Lch), TP6(Rch)
• Adjustment location :
L802 ................................................ 450kHz
7. DC Balance / Mono Distortion Adjustment
Settings : • Test point : TP3, TP4 (DC Balance)
: TP5(Lch), TP6(Rch) (Distortion)
• Adjustment location : L801
• Input level : 60dB
µ
V
Method : Set to FM 98.0MHz and adjust L801 so
that the voltage between TP3 and TP4
becomes 0V
±
0.04V.
Next, check that the distortion is less than
1.3%.
8. Tape Speed Adjustment (DECK 2)
Settings : • Test tape : TTA–100
• Test point : TP5(Lch), TP6(Rch)
• Adjustment location : SFR1
Method : Play back the test tape and adjust SFR1 so that the
frequency counter reads 3000Hz
±
5Hz and
±
45Hz
(REV) with respect to forward speed.
9. Head Azimuth Adjustment (DECK 1, DECK 2)
Settings : • Test tape : TTA–330
• Test point : TP5(Lch), TP6(Rch)
• Adjustment location : Head 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.
10. PB Frequency Response Check (DECK 1, DECK 2)
Settings : • Test tape : TTA–300
• Test point :TP5(Lch), TP6(Rch)
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
0dB
±
3dB.
11. PB Sensitivity Check (DECK 1, DECK 2)
Settings : • Test tape : TTA–200
• Test point : TP5(Lch), TP6(Rch)
Method : Play back the test tape and check that the output
level of the test point is 400mV
±
3dB.
12. REC/PB Frequency Response Adjustment (DECK 2)
Settings : • Test tape : TTA–602
• Test point : TP5(Lch), TP6(Rch)
• Input signal : 1kHz / 10kHz (LINE IN)
• Adjustment location : SFR351 (Lch)
SFR352 (Rch)
Method : Apply a 1kHz signal and REC mode. Then adjust
OSC attenuator so that the output level at the TP5,
TP6 becomes 28mV. Record and play back the 1kHz
and 10kHz signals and adjust SFRs so that the output
of the 10kHz signals becomes 0dB
±
0.5dB with
respect to that of the 1kHz signal.
13. REC/PB Sensitivity Check (DECK 2)
Settings : • Test tape : TTA–602
• Test point : TP5(Lch), TP6(Rch)
• Input signal : 1kHz (LINE IN)
Method : Apply a 1kHz signal and REC mode. Then adjust
OSC attenuator so that the output level at TP5, TP6
becomes 280mV. Record and play back the 1kHz
signals and check that the output is –1dB
±
3.0dB.
< FRONT SECTION >
14.
µ
-CON OSC Adjustment
Settings : • Test point : TP7 and TP8 (GND)
• Adjustment location : L101
Method : Insert AC plug while pressing TUNER function key.
Adjust L101 so that the frequency at the test point is
208.80Hz
±
0.2Hz.
< TUNER SECTION > < DECK SECTION >
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