Aiwa NSX–BL54 Service Manual page 31

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< TUNER SECTION >
1. Clock frequency Check
Settings : • Test point : TP2
Method : Set to AM 1602kHz and check that the test point is
2052kHz ± 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 : TP8(Lch), TP9(Rch)
• Adjustment location :
L951(1/3) ...................................... 1000kHz
Method : Set to AM 1000kHz and adjust L951(1/3) so that
the level at the test point becomes maximum.
5. FM Tracking Check
Settings : • Test point : TP8(Lch), TP9(Rch)
Method : Set to FM 98.0MHz and check that the test point is
less than 9dBµV.
6. AM IF Adjustment
Settings : • Test point : TP8(Lch), TP9(Rch)
• Adjustment location :
L802 ............................................. 1000kHz
7. DC Balance / Mono Distortion Adjustment
Settings : • Test point : TP3, TP4 (DC Balance)
• Adjustment location : L801
• Input level : 60dBµV
Method : Set to FM 98.0MHz and adjust L801 so that the
voltage between TP3 and TP4 becomes 0V ± 0.3V.
Next, check that the distortion is less than 1.3%.
< DECK SECTION >
8. 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 and ±45Hz
(REV) with respect to forward speed.
9. Head Azimuth Adjustment (DECK 1, DECK 2)
Settings : • Test tape : TTA–330
• Test point : TP8(Lch), TP9(Rch)
• Adjustment location : Head azimuth
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.
: TP8(Lch), TP9(Rch) (Distortion)
adjustment screw
10. PB Frequency Response Check (DECK 1, DECK 2)
Settings : • Test tape : TTA–300
• 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 5dB.
11. PB Sensitivity Check (DECK 1, DECK 2)
Settings : • Test tape : TTA–200
• Test point : TP8(Lch), TP9(Rch)
Method : Play back the test tape and check that the output
level of the test point is 140mV ± 3dB.
12. 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. 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.
13. 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. Record and play back the 1kHz
signals and check that the output is –2dB ± 3.0dB.
< FRONT SECTION >
14. µ-CON OSC Adjustment
Settings : • Test point : TP7 and GND
• Adjustment location : L331
Method : Insert AC plug while pressing POWER and TUNER
function keys. Adjust L331 so that the frequency at
the test point is 153.84Hz ± 0.15Hz.
45
SFR452 (Rch)