Aiwa NSX-WV89 Service Manual page 37

ADJUSTMENT <TUNER / DECK / FRONT>
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3 7 63 1515 0
A MAIN C.B
SFR352
14
3
8
4 9
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13
10
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11
15
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DECK–1 P HEAD
DECK–2 R/P/E HEAD
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L 13942296513
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FWD
< TUNER SECTION >
1. Clock frequency Check
Settings : • Test point : TP2 (CLK)
Method : Set to MW 1602kHz and check that the test point is
2052kHz ± 45Hz.
2. MW VT Adjustment
Settings : • Test point : TP1 (VT)
• Adjustment location : L953
Method : Set to MW 1602kHz and adjust L953 so that the test
point becomes 8.0V ± 0.05V. Then set to MW 531kHz
and check that the test point is more than 0.3V.
3. MW Tracking Adjustment
Settings : • Test point : TP5(Lch), TP6(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.
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4. AM IF Adjustment
Settings : • Test point : TP5(Lch), TP6(Rch)
.
• Adjustment location :
L802 ................................................ 450kHz
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SFR351
L801
GND
GND
TP5 (LCH)
TP7
TP6 (RCH)
(LCH)
11
REV
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2 9
8
9 4 1
L802
TP4 (DC BALANCE)
IC801
TP3 (DC BALANCE)
TP2 (CLK)
TP8
(RCH)
I DECK C.B
Q Q
3 6 7 1 3 1 5
SFR1
10
5. SW VT Adjustment
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.
6. SW Tracking Adjustment
Settings : • Test point : TP5(Lch), TP6(Rch)
• Adjustment location :
L941 ............................................. 5.73MHz
TC943 .......................................... 17.9MHz
Method : Set up TC943 to center before adjustment.
The level at 5.73MHz is adjust to max. by L941.
Then the level at 17.9MHz is adjust to max. by TC943.
7. 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).
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8. 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 9dBµV.
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TC943
L941
TC941
L953
L952
L942
TP1 (VT)
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