Read Sony HCD-GRX20 / HCD-RXD3 / MHC-GRX20 / MHC-RXD3 (serv.man2) Service Manual online
13
TUNER SECTION
0 dB=1µV
AM Tuning Voltage Adjustment
Procedure:
1.
1.
Set the reception frequency of the unit to 530 kHz.
2.
Adjust L105 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.
8.0 ± 0.5 V.
Adjustment Location: MAIN board (See page 14)
AM Tracking Adjustment
Procedure:
1.
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).
will become 60 dB (µV/m).
3.
Adjust L104 so that when the waveform on the oscilloscope is
maximum, no noise appears.
maximum, no noise appears.
4.
Tune the set to 1,400 kHz.
5.
Adjust TC102 so that when the waveform on the oscilloscope
is maximum, no noise appears.
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.
capacitors.
Adjustment Location: MAIN board (See page 14)
Main board
TP1
G
VT
VT
DC voltmeter
+
–
AM RF SSG
loop antenna
set
loop antenna
(Supplied accessories)
(Supplied accessories)
60 cm
AM ANTENNA
terminal (TM1)
terminal (TM1)
30% amplitude
modulation by
400 Hz signal
modulation by
400 Hz signal
Field strength dB (
µ
V/m) =SSG output level dB (
µ
V/m) –26 dB.
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