SONY CFDS38
Service Manual

TUNER SECTION

0 dB = 1 µV

FM FREQUENCY COVERAGE Frequency Display Adjustment Part ADJUSTMENT 87.5 MHz 1.6 ± 0.4 V <confirmation> 108 MHz 4.0 ± 0.1V L2

� FM Section Setting: RADIO (BAND) button: FM
FM RF signal generator TP (FM ANT) 0.01 µF
set
75 kHz frequency deviation by 1 kHz signal output level : as low as possible

Reading on Digital voltmeter

FM TRACKING ADJUSTMENT Adjust for a maximum reading on level meter. L1 87.5 MHz CT1 108 MHz

AM FREQUENCY COVERAGE CHECK � AM Section Setting: RADIO (BAND) button: AM
AM RF signal generator Put the lead-wire antenna close to the set.

Frequency Display Reading on Digital voltmeter Adjustment Part

530 kHz 1.0 + 0.7 V � 0.5 V

1,710 kHz 4.8 + 1.2V � 0.6 V

<confirmation> <confirmation>

AM TRACKING ADJUSTMENT Adjust for a maximum reading on level meter. L4 620 kHz CT3 1,400 kHz

30% amplitude modulation by 400 Hz signal

� For AM adjustment, fix the ferrite-rod antenna (L3) as shown below and then perform tracking adjustment at L4 and CT3. Lastly check the voltage.
3.0 ± 1.0 mm
level meter (range: 0.5�5 V ac) 32 �

� Connecting Level Meter (FM and AM)

set
2 jack (J301)

L3 AM FERRITE-ROD ANTENNA

Adjustment Location: See page 14. � Connecting Digital Voltmeter (FM and AM)
digital voltmeter 100 k� TP (VT) (JW17)

� Repeat the procedures in each adjustment several times, and the frequency coverage and tracking adjustments should be finally done by the trimmer capacitors.

� 13 �