Aiwa NSX-VC220, Руководство по обслуживанию

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ADJUSTMENT <TUNER / FRONT / DECK>
< TUNER SECTION >
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 8.0 V ± 0.05 V. Then set to MW 530 kHz
and check that the test point is more than 0.3 V.
3. MW Tracking Adjustment
Settings : • Test point : TP8 (Lch), TP9 (Rch)
• Adjustment location :
L952 ................................................... 603 kHz
TC941 ............................................... 1404 kHz
Method : Set up TC941 to center before adjustment.
The level at 630 kHz is adjusted to maximum by L952.
Then the level at 1404 kHz is adjust to maximum by
TC941.
4. 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.
5. 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 adjust to maximum by L941.
Then the level at 17.9 MHz is adjust to maximum by
TC943.
6. 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 0.5 V.
7. FM Tracking Adjustment
Settings : • Test point : TP8 (Lch), TP9 (Rch)
• Adjustment location: L903
Method : Set to FM 98.0 MHz and adjust L903 so that the
test point is less than 9 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)
TP8 (LCH), TP9 (RCH)
(MONO DISTORTION)
• Adjustment location : L801
• Input level : 60 dBµV
Method : Set to FM 98.0 MHz and adjust L801 so that the
distortion is minimun. Next, check that the voltage
between TP3 and TP4 is 0 V ± 500 mV.
< FRONT SECTION >
10. µ-CON OSC Adjustment
Settings : • Test point : TP5 (KEY-SCAN)
TP6 (GND)
• Adjustment location : L501
Method : Insert AC plug while pressing of "TUNER" key and
"POWER" function key.
Connect a frequency counter across TP5 and TP6.
Then adjust L501 so that the test point becomes
92.470 Hz ± 0.092 Hz (92.378 Hz ~ 92.562 Hz).