Read Sony HCD-RXD2 / MHC-RXD2 (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.
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.
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)
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