Sony hcd-grx40av Service Manual page 16

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TUNER SECTION
AM Tuning Voltage Adjustment
DC voltmeter
Main board
TP1
G
VT
Procedure:
1. Set the reception frequency of the unit to 530 kHz.
2. Adjust L107 for 1.2 ± 0.05 V reading on the DC voltmeter.
3. Set the reception frequency of the unit to 1,710 kHz.
4. Confirm that the voltage reading on the DC voltmeter is within
8.0 ± 0.5 V.
Adjustment Location: MAIN board (See page 17)
AM Tracking Adjustment
AM RF SSG
TE
L 13942296513
30% amplitude
modulation by
400 Hz signal
Procedure:
1. Tune the set to 600 kHz.
2. Set the output of AM RF SSG so that the input level of the set
will become 60 dB (µV/m).
3. Adjust L104 so that when the waveform on the oscilloscope is
maximum, no noise appears.
4. Tune the set to 1,400 kHz.
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0 dB=1µV
+
–
loop antenna
Field strength dB ( µ V/m) =SSG output level dB ( µ V/m) –26 dB.
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8
loop antenna
(Supplied accessories)
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AM ANTENNA
60 cm
terminal (TM1)
5. Adjust TC101 so that when the waveform on the oscilloscope
is maximum, no noise appears.
• Repeat the procedures in each adjustment several times, and the
tracking adjustment should be finally done by the trimmer
capacitors.
Adjustment Location: MAIN board (See page 17)
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