Aiwa AV-D57, Руководство по обслуживанию, Страница: 32 / 35

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5. FM Tracking Check
Settings : • Test point : TP9(Lch), TP9(Rch)
Method : • Set to FM 98.0MHz and check that the test point is
less than 9.0dB.
6. AM IF Adjustment
Settings : • Test point : TP8(Lch), TP9(Rch)
• Adjustment location :
L772 ................................................ 450kHz
7. DC Balance / Mono Distortion Adjustment
Settings : • Test point : TP3, TP4 (DC Balance)
TP8(Lch), TP9(Rch) (Distortion)
• Adjustment location : L771
• Input level : 60dB
µ
V
Method : Set to FM 98.0MHz and adjust L771 so that the
voltage between TP3 and TP4 becomes 0V
±
0.04V.
Next, check that the distortion is less than 1.3%.
< TUNER SECTION >
1. Clock Check
Settings : • Test point : TP2(CLK)
Method : Set to AM 1710kHz and check that the test point is
2160kHz
±
45Hz.
2. AM VT Check
Settings : • Test point : TP1(VT)
Method : Set to AM 1710kHz and AM 530kHz and check
that the test point is less than 8.5V(1710kHz) and
more than 0.6V(530kHz).
3. AM Tracking Adjustment
Settings : • Test point : TP8(Lch), TP9(Rch)
• Adjustment location :
L981(1/3) ...................................... 1000kHz
Method : Set to MW 1000kHz and adjust L981(1/3) so that the
test point is max.
4. FM VT Check
Settings : • Test point : TP1(VT)
Method : Set to FM 108.0MHz and check that the test point is
less than 8.0V.
Then, set to FM 87.5MHz and check that the test point
is more than 0.5V.
ADJUSTMENT <TUNER>
TUNER C.B C
L981
FFE801
IC771
L771
TP4
(DC BALANCE)
TP1
(VT)
TP2
(CLK)
2
L772
(1/3)
4 3
1
TP9
(RCH)
TP8
(LCH)
7 5
3 6
CN601
TP3
(DC BALANCE)
6 7
7
G