Aiwa AV-D78 Service Manual page 30

ADJUSTMENT <TUNER / FRONT>
QQ
< TUNER SECTION >
3 7 63 1515 0
1. Clock Frequency 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 8.0V (1710kHz) and more than
0.6V (530kHz).
3. AM Tracking Adjustment
Settings : • Test point : TP8 (Rch), TP9 (Lch)
• Adjustment location : L951 (1/3)
Method : Set to AM 1000kHz and adjust L951 (1/3) so that the
test point is maximum.
4. AM IF Adjustment
Settings : • Test point : TP8 (Rch), TP9 (Lch)
• Adjustment location :
L802 ................................................ 450kHz
5. FM VT Adjustment
Settings : • Test point : TP1 (VT)
• Adjustment location : L907
Method : Set to FM 108.0MHz and adjust L907 so that the test
point becomes 7.0V ± 0.05V. Then set to FM 87.5MHz
and check that the test point is more than 0.5V.
6. FM Tracking Adjustment
Settings : • Test point : TP8 (Rch), TP9 (Lch)
• Adjustment location : L904
TE
L 13942296513
Method : Set to FM 98.0MHz and adjust L904 so that test point is
maximum and distortion is minimum.
7. DC Balance / Mono Distortion Adjustment
Settings : • Test point : TP3, TP4 (DC Balance)
TP8 (Rch), TP9 (Lch) (Distortion)
• Adjustment location : L801
• Input level : 60dBµV
Method : Set to FM 98.0MHz and adjust L801 so that the
distortion is less than 1.3%. Then check that the voltage
between TP3 and TP4 is 0V ± 0.5V.
www
.
http://www.xiaoyu163.com
x ao u163
y
i
http://www.xiaoyu163.com
< FRONT SECTION >
2 9
8
1. µ-CON OSC Adjustment
Settings : • Test point : TP1 (K-SCAN) and GND
• Adjustment location : L101
Method : Insert AC plug while pressing ECO key. Adjust L101
so that the frequency at the test point becomes
78.4Hz ± 0.08Hz (12.742ms ~ 12.768ms).
Q Q
3 6 7 1 3 1 5
co
.
– 30 –
9 4 2 8
0 5 8 2 9 9 4 2 8
m
9 9
9 9