Aiwa XS-V30 Service Manual page 26

ADJUSTMENT <TUNER / DECK / FRONT >
QQ
< TUNER SECTION >
3 7 63 1515 0
1. Clock Frequency Check
Settings : • Test point : TP2 (CLK)
Method : Set to MW 1602 kHz and check that the test point is
2052 kHz ± 45 Hz.
2. MW VT Adjustment
Settings: • Test point : TP1 (VT)
• Adjustment location : L953
Method : Set to MW 1710 kHz and adjust L953 so that the test
point becomes 8.5 V ± 0.05 V.
Then set to MW 530 kHz and check that the test point is
more than 0.3 V.
3. SW VT Adjustment
Settings: • Test point : TP1 (VT)
• Adjustment location : L942
Method : Set to SW 17.9 MHz and adjust L942 so that the test
point becomes 8.0 V ± 0.05 V.
Then set to SW 5.73 MHz and check that the test point is
more than 0.3 V.
4. FM VT Adjustment
Settings: • Test point : TP1 (VT)
• Adjustment location : L906
Method : Set to FM 108.0 MHz and adjust L906 so that the test
point becomes 7.0 V ± 0.1 V.
Then set to FM 87.5 MHz and check that the test point is
more than 0.4 V.
5. MW Tracking Adjustment
Settings : • Test point : TP8 (Lch), TP9 (Rch)
• Adjustment location :
TE
L952.....................................603 kHz
L 13942296513
TC941.................................1404 kHz
Method : Set up TC941 to center before adjustment. The level at
603 kHz is adjusted to maximum by L952. Then the
level at 1404 kHz is adjusted to maximum by TC941.
www
.
http://www.xiaoyu163.com
x ao u163
y
i
http://www.xiaoyu163.com
2 9
8
6. SW Tracking Adjustment
Settings : • Test point : TP8 (Lch), TP9 (Rch)
• Adjustment location :
L941....................................5.73 MHz
TC943.................................17.9 MHz
Method : Set up TC943 to center before adjustment. The level at
5.73 MHz is adjusted to maximum by L941. Then the
level at 17.9 MHz is adjusted to maximum by TC943.
7. FM Tracking Adjustment
Settings : • Test point : TP8 (Lch), TP9 (Rch)
• Adjustment location : L903
Method : Set to FM 87.5 MHz and adjust L903 so that the test
point becomes less than 9.0 dBµV.
8. AM IF Adjustment
Settings : • Test point : TP8 (Lch), TP9 (Rch)
• Adjustment location :
L802..............................450 kHz
9. DC Balance / Mono Distortion Adjustment
Settings : • Test point : TP3, TP4 (DC Balance)
• Adjustment location : L801
• Input level : 60 dBµV
Method : Set to FM 98.0 MHz and adjust L801 so that the
distortion is less than 1.2 % or minimum.
Then check that the voltage between TP3 and TP4
is 0 V ± 500 mV.
Q Q
3 6 7 1 3 1 5
co
.
– 26 –
9 4 2 8
: TP8 (Lch), TP9 (Rch) (Mono Distortion)
0 5 8 2 9 9 4 2 8
m
9 9
9 9