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— 11 —
TUNER SECTION
0 dB=1µV
AM Tuning Voltage Adjustment
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: MAIN board
AM Tracking Adjustment
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: MAIN board
FM Tuning Voltage Adjustment
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: MAIN board
+
–
DC voltmeter
TP1
Main board
IF
G
VT
set
loop antenna
AM RF SSG
60cm
Field strength dB (µV/m) = SSG output level dB (µV/m) –26dB.
30% amplitude
modulation by
400Hz signal
Center of
Bar antenna (L104)
TP1
Main board
IF
G
VT
Summary of Contents for HCD-G101
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Page 48: ...HCD G101 1997 08 ...
Page 49: ...HCD G101 2 MEMO ...