Sony HCD-G101 Service Manual page 11

TUNER SECTION
AM Tuning Voltage Adjustment
Main board
TP1
IF
G
VT
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
AM RF SSG
30% amplitude
modulation by
400Hz 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.
FM Tuning Voltage Adjustment
Main board
TP1
IF
G
VT
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
0 dB=1µV
DC voltmeter
+
–
loop antenna
Field strength dB (µV/m) = SSG output level dB (µV/m) –26dB.
DC voltmeter
+
–
set
60cm
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
— 11 —
Center of
Bar antenna (L104)