-31-
ELECTRICAL ADJUSTMENT-2/4 (U MODEL)
< TUNER SECTION >
1. FM VT Check
Settings: • Test point: TP4
Method: Set to FM 87.5MHz, 108.0MHz and check that the test
point is more than 0.4V (87.5MHz) and less than 9.0V
(108.0MHz).
2. FM TARCKING check
Settings: • Test point: TP8 (Lch)
TP9 (Rch)
Method: Set to FM 98.0MHz and check that the test point is less
than 9.0dBµV.
3. DC Balance Adjustment
Settings: • Test point: TP5, TP6
• Adjustment location: L771
• Input level: 50dBµV
Method: Set to FM 83.0MHz, 98.0MHz and adjust L771 so that
the voltage between TP5 and TP6 becomes 0V±0.04V.
4. VT AM check
Settings: • Test point: TP4
Method: Set to AM 1710kHz, 530kHz and check that the test
point is more than 0.6V (530kHz) and less than 8.5V
(1710kHz) .
5. AM IF Adjustment
Settings: • Test point: TP8 (Lch)
TP9 (Rch)
• Adjustment location: L772
Method: Set to AM 999kHz, 1000kHz and adjust L772 so that
the Wave to maximum.
6. AM Tracking Adjustment
Settings: • Test point: TP8 (Lch)
TP9 (Rch)
• Adjustment location: L981
Method: Set to AM 999kHz, 1000kHz and adjust L981 so that
the test point is less than 58dBµ, lock it with
PARAPFIN.
< DECK SECTION >
7. Tape speed Adjustment
Settings: • Test tape: TTA-100
• Test point: PHONES JACK (J201)
• Adjustment location: SFR1
Method: Play back the test tape and adjust so that the output
frequency is 3000Hz ±30Hz.
8. Azimuth Adjustment
Settings: • Test tape: TTA-320
• Test point: PHONES JACK (J201)
• Adjustment location:Azimuth adjustment screw
Method: Play back the test tape and adjust so that the output is
maximum.
< CD SECTION >
9. CD Focus Bias Adjustment
Settings: • Test Disc : TCD-782
• Test point: TP1 +
Vref -
• Adjustment location: SFR530
Method: Play back the test CD track 2 and adjust so that the
output level is DC 0mV±10mV.
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TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
http://www.xiaoyu163.com
http://www.xiaoyu163.com
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