— 11 —
TUNER SECTION
0 dB=1µV
AM Tuning Voltage Adjustment
+
–
TP2
(VT)
Tuner board
DC voltmeter
Procedure:
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.
Adjustment Location: TUNER board
AM Tracking Adjustment
loop antenna
Field strength dB (µV/m) = SSG output level dB (µV/m) –26dB.
loop antenna
(Supplied accessories)
AM RF SSG
30% amplitude
modulation by
400Hz signal
60cm
set
AM antenna
terminal (JK101)
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.
5. Adjust TC102 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: TUNER board
DC voltmeter
+
–
Procedure :
1. Set the reception frequency of the unit to 87.5 MHz.
2. Adjust L103 for 1.2 ± 0.05V reading on the DC voltmeter.
3. Set the reception frequency of the unit to 108 MHz.
4. Confirm that the voltage reading on the DC voltmeter is within
7.8 ± 0.5V.
Adjustment Location: TUNER board
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