Aiwa AV-D58 Service Manual page 30

ADJUSTMENT <TUNER / FRONT>
< TUNER SECTION >
1. Clock frequency Check
Settings : • Test point : TP2 (CLK)
Method : Set to MW 1602kHz and check that the test point is
2052kHz ± 45Hz.
2. MW VT Check
Settings : • Test point : TP1 (VT)
Method : Set to MW 1602kHz and check that the test point is less
than 8.0V. Then set to MW 531kHz and check that the
test point is more than 0.6V.
3. MW Tracking Adjustment
Settings : • Test point : TP8(Rch), TP9(Lch)
• Adjustment location :
L951(1/3) ........................................ 999kHz
Method : Set to MW 999kHz 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. LW VT Adjustment
Settings : • Test point : TP1(VT)
• Adjustment location : L942
Method : Set to LW 144kHz and adjust L942 so that the test
point becomes 1.3V ± 0.05V. Then set to LW 290kHz
and check that the test point is less than 8.0V.
7. FM Tracking Adjustment
Settings : • Test point : TP8(Rch), TP9(Lch)
• Adjustment location : L901,902,904,905
Method : Set to FM 98.0MHz and adjust L901,902,904,905 so
that test point is maximum and distortion is minimum.
8. FM Tracking Check
Settings : • Test point : TP8(Rch), TP9(Lch)
Method : Set to FM 98.0MHz and check that the test point is
less than 13dBµV.
9. LW Tracking Adjustment
Settings : • Test point : TP8(Rch), TP9(Lch)
• Adjustment location :
L941 ................................................ 144kHz
TC942 ............................................. 290kHz
Method : Set up TC942 to center before adjustment. The level at
144kHz is adjusted to maximum by L941. Then the level
at 290kHz is adjusted to maximum by TC942.
10. DC Balance / Mono Distortion Adjustment
Settings : • Test point : TP3, TP4 (DC Balance)
• Adjustment location : L801
• Input level : 60dBµV
Method : Set to FM 98.0MHz and adjust L801 so that the
voltage between TP3 and TP4 becomes 0V ± 0.5V
with distortion less than 1.3%.
11. Output Level Check
<MW>
Settings : • Test point : TP8(Rch), TP9(Lch)
• Input level : 74dBµV
Method : Set to MW 999kHz and check that test point is
55mV ± 3dB.
<FM>
Settings : • Test point : TP8(Rch), TP9(Lch)
• Input level : 60dBµV
Method : Set to FM 98.0MHz and check that test point is
270mV ± 3dB.
< FRONT SECTION >
1. µ-CON OSC Adjustment
Settings : • Test point : TP1 (O-K-SCAN) and GND
• Adjustment location : L101
Method : Insert AC plug while pressing TUNER function key.
Adjust L101 so that the frequency at the test point is
78.52Hz ± 0.08Hz (12.723ms ~ 12.749ms).
– 30 –
: TP8(Rch), TP9(Lch) (Distortion)