Aiwa NSX-AJ300 Service Manual page 30

ADJUSTMENT <TUNER / FRONT / DECK>
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< TUNER SECTION >
1. Clock Frequency Check
Settings : • Test point : TP2 (CLK)
Method : Set to AM 1710kHz(U,LH), MW 1602kHz(EZ) and
check that the test point is 2160kHz ± 45Hz(U,LH),
2052kHz ± 45Hz(EZ).
2. AM(MW) VT Check
Settings : • Test point : TP1 (VT)
Method : Set to AM 1710kHz(U,LH), MW 1602kHz(EZ) and
check that the test point is less than 8.5V(U,LH), less
than 8.0V(EZ).
Then set to AM 530kHz(U,LH), MW 531kHz (EZ) and
check that the test point is more than 0.6V.
3. LW VT Adjustment <EZ>
Settings : • Test point : TP1 (VT)
• Adjustment location : L942
Method : Set to LW 144kHz and adjust L942 so that the test point
becomes 1.3V ± 0.05V. Then set to LW 290kHz and
check that the test point is less than 8.0V.
4. FM VT Adjust <U,LH>
Settings : • Test point : TP1 (VT)
• Adjustment location : L906
Method : Set to FM 87.5MHz, 108.0MHz and adjust L906 so that
the test point becomes more than 0.4V (87.5MHz) and
equals to 7.0V ± 0.1V (108.0MHz).
5. FM VT Check <EZ>
Settings : • Test point : TP1 (VT)
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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).
6. AM(MW) Tracking Adjustment
Settings : • Test point : TP8(Lch), TP9(Rch)
• Adjustment location : L951(1/3)
Method : Set to AM 1000kHz(U,LH), MW 999kHz(EZ) and
adjust L951(1/3) to MAX.
7. LW Tracking Adjustment <EZ>
Settings : • Test point : TP8(Lch), TP9(Rch)
• Adjustment location :
L941 ..........................................................144kHz
TC942 ........................................................290kHz
Method : Set up TC942 to center before adjustment.
Adjust L941 so that the level at 144kHz becomes
maximum. Then adjust TC942 so that the level at
290kHz becomes maximum.
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8. FM Tracking Adjustment <U,LH>
Settings : • Test point : TP8(Lch), TP9(Rch)
• Adjustment location : L903
Method : Set to FM 87.5MHz and adjust L903 so that the test
point becomes maximum.
9. FM Tracking Check <EZ>
Settings : • Test point : TP8(Lch), TP9(Rch)
Method : Set to FM 98.0MHz and check that the test point is less
than 13dBµV.
10. AM IF Adjustment
Settings : • Test point : TP8(Lch), TP9(Rch)
• Adjustment location :
L802 .............................................. .450kHz.
11. 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 ± 500mV.
Next, check that the distortion is less than 1.2%.
< FRONT SECTION >
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12. -CON OSC Adjustment
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Settings : • Test point : TP11 (KEY-SCAN), (GND)
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• Adjustment location : L951
Method : Connect a frequency counter across TP11 (KEY-SCAN)
and GND. Insert AC plug while pressing POWER key
and TUNER function key. Then adjust L951 so that the test
point becomes 112.88Hz ± 0.11Hz.
To manual reset press POWER key while pressing
CLEAR key.
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TP8(Lch), TP9(Rch) (Distortion)
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