Aiwa AV-D77 HC Service Manual page 29

ADJUSTMENT <TUNER / FRONT>
< TUNER SECTION >
1. Clock Frequency Check
Settings : • Test point : TP2(CLK)
Method : Set to AM 1602kHz and check that the test point is
2052kHz ± 45Hz.
2. AM VT Check
Settings : • Test point : TP1(VT),
Method : Set to AM 1602kHz, AM 531kHz and check
that the test point is less than 8.0V(1602kHz) and
more than 0.6V(531kHz).
3. AM Tracking Adjustment
Settings : • Test point : TP8(Lch), TP9(Rch)
• Adjustment location : L981(1/3)
Method : Set to MW 999kHz 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.
5. 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 9.0dBµV.
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 : 60dBµV
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%.
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< FRONT SECTION >
1. µ-CON OSC Adjustment
– 29 –
Settings : • Test point : TP1 and GND
• Adjustment location : L801
Method : Insert AC plug while pressing POWER and ECO key.
Adjust L801 so that the frequency at the test point is
78.40Hz ± 0.08Hz.