Aiwa NSX-AJ800 Service Manual page 35

ADJUSTMENT – 1 <TUNER / FRONT>
< TUNER SECTION >
1. Clock Frequency Check
Settings : • Test point :
Method : Set to AM 1710 kHz and check that the test point is
2160 kHz ± 45 Hz.
2. AM VT Check
Settings : • Test point :
Method : Set to AM 1710 kHz and check that the test point is less
than 8.5 V. Then set to AM 530 kHz and check that the
test point is more than 0.6 V.
3. AM Tracking Adjustment
Settings : • Test point :
• Adjustment location : L951(1/3)
Method : Set to AM 1000 kHz and adjust L951(1/3) so that the
test point becomes maximum.
4. AM IF Adjustment
Settings : • Test point :
• Adjustment location :
L802 ................................................... 450 kHz
5. FM VT Adjustment
Settings : • Test point :
• Adjustment location: L906
Method : Set to FM 87.5 MHz check that the test point is more
than 0.4 V. Then set to FM 108.0 MHz and adjust L906
so that the test point becomes 7.0 V ± 0.1 V.
6. FM Tracking Adjustment
Settings : • Test point :
• Adjustment location: L903
Method : Set to FM 87.5 MHz and adjust L903 so that the
test point is less than 9 dBµV.
7. DC Balance / Mono Distortion Adjustment
Settings : • Test point :
• Adjustment location : L801
• Input level :
Method : Set to FM 98.0 MHz and adjust L801 so that the voltage
between TP3 and TP4 becomes 0 V ± 500 mV with
minimum distortion.
8. Output Level Check
<AM>
Settings : • Test point :
• Input level :
Method : Set to AM 1000 kHz and check that the test point is
40 mV ± 3 dB.
<FM>
Settings : • Test point :
• Input level :
Method : Set to FM 98.0 MHz and check that the test point is
150 mV ± 3 dB.
9. FM Separation Check
Settings : • Test point :
• Input level :
Method : Set to FM 98.0 MHz and check that the test point is
more than 25 dB.
TP2 (CLK)
TP1 (VT)
TP8 (Lch), TP9 (Rch)
TP8 (Lch), TP9 (Rch)
TP1 (VT)
TP8 (Lch), TP9 (Rch)
TP3, TP4 (DC Balance)
TP8 (LCH), TP9 (RCH)
(Mono Distortion)
60 dBµV
TP8 (Lch), TP9 (Rch)
74 dBµV
TP8 (Lch), TP9 (Rch)
60 dBµV
TP8 (Lch), TP9 (Rch)
60 dBµV
< FRONT SECTION >
10. µ-CON OSC Adjustment
Settings : • Test point :
• Adjustment location : L151
Method : Insert AC plug while pressing of "POWER" key and
"TUNER" function key.
Connect a frequency counter across TP5 and TP6.
Then adjust L501 so that the test point becomes
141.67 Hz ± 0.14 Hz.
[ Manual Reset ]
Make up for RESET after adjustment.
* Reset is to press "POWER" key while pressing of
"CLEAR (STOP)" key.
– 35 –
TP5 (KEY-SCAN)
TP6 (GND)