Aiwa NSX-BL14 Service Manual page 34

< TUNER SECTION >
1. Clock frequency Check
Settings : • Test point : TP2 (CLK)
Method : Set to AM 1710kHz(LH), MW 1602kHz(HR,V)
and check that the test point is 2160kHz ± 0.045kHz(LH),
2052kHz ± 0.045kHz(HR,V).
2. AM(MW) VT Check
Settings : • Test point : TP1 (VT)
Method : Set to AM 1710kHz(LH), MW 1602kHz(HR,V) and
check that the test point is less than 8.5V(LH), less than
8.0V (HR,V).
Then set to 530kHz(LH), 531kHz(HR,V) and check that
the test point is more than 0.6V.
3. FM VT Check
Settings : • Test point : TP1 (VT)
Method : LH, HR:
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).
V:
Set to FM 65.0MHz, 108.0MHz and check that the test
point is more than 1.0V (65.0MHz) and less than 9.5V
(108.0MHz).
4. AM(MW) Tracking Adjustment<LH,V>
Settings : • Test point : TP8(Lch), TP9(Rch)
• Adjustment location :
L951 (1/3) ................................................... 1000kHz
Method : Set to AM(MW) 999kHz and adjust L951 (1/3) to
MAX.
5. MW VT Adjustment<HR>
Settings : • Test point : TP1 (VT)
• Adjustment location : L953
Method : Set to MW 1710kHz and adjust L953 so that the test
point becomes 8.0V ± 0.05V. Then set to MW 530kHz
and check that the test point is more than 0.3V.
B FRONT C.B
FL201
GND
IC101
L101
SFR701
18
12
TP5 (K-SCAN)
18
18
6. MW Tracking Adjustment<HR>
Settings : • Test point : TP8(Lch), TP9(Rch)
• Adjustment location :
L952 ................................................ 603kHz
TC941 ........................................... 1404kHz
Method : Set up TC941 to center before adjustment.
The level at 603kHz is adjust to max. by L952.
Then the level at 1404kHz is adjust to max. by TC941.
7. 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(LH,HR), less than 8dBµV(V).
8. AM(MW) IF Adjustment
Settings : • Test point : TP8(Lch), TP9(Rch)
• Adjustment location :
L802 ............................................................ 450kHz
9. SW VT Adjustment<HR>
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.
10. SW Tracking Adjustment<HR>
Settings : • Test point : TP8(Lch), TP9(Rch)
• Adjustment location :
L941 ............................................... 5.9MHz
TC943 .......................................... 17.9MHz
Method : Set up TC943 to center before adjustment.
The level at 5.9MHz is adjust to max. by L941.
Then the level at 17.9MHz is adjust to max. by TC943.
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 ± 300 mV with
minimum distortion.
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