Aiwa CSD-MD50, Service Manual, Page: 39 / 74

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< TUNER SECTION >
1. AM VT Check
Settings: • Test point: TP4 (VT)
Method: Set to AM 1611kHz and check that the test
point is less than 5.6V.
2. AM IF Adjustment
Settings: • Test point: J201 (PHONES)
L772 .............................................. 450kHz
3. AM Tracking Adjustment
Settings: • Test point: J201 (PHONES)
• Adjustment location: L981
Method: Set to AM 999kHz and adjust L981 so that the
test point becomes maximum.
4. FM VT Check
Settings: • Test point: TP4 (VT)
Method: Set to FM 108.0MHz and check that the test
point is more than less than 7.3V.
0 0
R.P.E HEAD
9
SFR1
5. FM Tracking Check
Settings: • Test point: J201 (PHONES)
Method: Set to FM 98.0MHz and check that the test
point is less than 20dBµV.
6. DC Balance/Mono Distortion Adjustment
Settings: • Test point: TP5, TP6
• Adjustment location: L771
• Input level: 54dB
Method: Set to FM 98.0MHz and adjust L771 so that
the voltage between TP5 and TP6 becomes
0V±0.04V.
Next, check that the distortion is less than
1.3%.
7. FM Auto Stop Adjustment
Settings: • Adjustment location: VR770
• Input level: 28dBµV
Method: Set to FM 98.0MHz and adjust VR770 so that
the level 28dBµV±3dB.