Aiwa NSX-SZ30LH Service Manual page 21

ADJUSTMENT <TUNER / DECK / FRONT>
< TUNER SECTION >
1. Clock Frequency Check
Settings : • Test point : TP2 (CLK)
Method : Set to AM 1710kHz(LH), AM 1602kHz(HS),
MW 1602kHz(HR,HT) and check that the test point is
2160kHz ± 45Hz(LH), 2052kHz ± 45Hz(HR,HS,HT).
2. AM VT Check<LH,HS>
Settings : • Test point : TP1 (VT)
Method : Set to AM 1710kHz(LH), AM 1602kHz(HS) and check
that the test point is less than 8.5V(LH), less than
8.0V(HS). Then set to AM 530kHz(LH), AM 531kHz(HS)
and check that the test point is more than 0.6V.
3. MW VT Adjustment <HR,HT>
Settings : • Test point : TP1 (VT)
• Adjustment location : L953
Method : Set to MW 1602kHz and adjust L953 so that the test point
becomes 8.5V ± 0.05V. Then set to MW 531kHz and
check that the test point is more than 0.3V.
4. SW VT Adjustment <HR,HT>
Settings : • Test point : TP1 (VT)
• Adjustment location : L942
Method : Set to SW 17.9MHz and adjust L942 so that the test point
becomes 8.0V ± 0.05V. Then set to SW 5.73MHz and
check that the test point is more than 0.3V.
5. 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).
6. AM Tracking Adjustment<LH,HS>
Settings : • Test point : TP8(Lch), TP9(Rch)
• Adjustment location : L951(1/3)
Method : Set to AM 1000kHz and adjust L951(1/3) to MAX.
7. MW Tracking Adjustment <HR,HT>
Settings : • Test point : TP8(Lch), TP9(Rch)
• Adjustment location :
L952 ..........................................................603kHz
TC941 .....................................................1404kHz
Method : Set up TC941 to center before adjustment. Adjust L952
so that the level at 603kHz becomes maximum. Then
adjust TC941 so that the level at 1404kHz becomes
maximum.
8. SW Tracking Adjustment <HR,HT>
Settings : • Test point : TP8(Lch), TP9(Rch)
• Adjustment location :
L941 ..........................................................5.9MHz
TC943 ......................................................17.9MHz
Method : Set up TC943 to center before adjustment. Adjust L941
so that the level at 5.9MHz becomes maximum. Then
adjust TC943 so that the level at 17.9MHz becomes
maximum.
9. FM Tracking Check
Settings : • Test point : TP8(Lch), TP9(Rch)
Method : Set to FM 83.0MHz(LH,HS), FM 98.0MHz(HR,HT)
and check that the test point is less than 10dBµV(LH,HS),
less than 9dBµV(HR,HT).
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 ± 300mV, with
minimum distortion.
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TP8(Lch), TP9(Rch) (Distortion)