Aiwa AV-D67 Service Manual page 32

ADJUSTMENT <TUNER>
C G
TUNER C.B
TP9
(RCH)
TP8
(LCH)
< 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, 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.
CN601
1
3 5
6 7
6
7
L772
L771
IC771
TP2
(CLK)
TP3
(DC BALANCE)
TP4
(DC BALANCE)
7
5. FM Tracking Check
Settings : • Test point : TP9(Lch), TP9(Rch)
Method : • Set to FM 98.0MHz and check that the test point is
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)
• Adjustment location : L771
• Input level : 60dB V
Method : Set to FM 98.0MHz and adjust L771 so that the
voltage between TP3 and TP4 becomes 0V
Next, check that the distortion is less than 1.3%.
– 32 –
FFE801
TP1
L981
(VT)
(1/3)
2 4
3
less than 9.0dB.
TP8(Lch), TP9(Rch) (Distortion)
0.04V.