HCD-G101, MHC-G101 - Sony Audio Service Manual (repair manual). Page 11

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0 dB=1µV

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

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

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