Read Sony CFD-S38 / CFD-S55 Service Manual online
– 13 –
FM FREQUENCY COVERAGE
ADJUSTMENT
Frequency Display
87.5 MHz
108 MHz
Reading on Digital voltmeter
1.6 ± 0.4 V
4.0 ± 0.1V
Adjustment Part
<confirmation>
L2
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L1
CT1
87.5 MHz
108 MHz
AM FREQUENCY COVERAGE
CHECK
Frequency Display
530 kHz
1,710 kHz
Reading on Digital voltmeter
1.0
+ 0.7 V
4.8
+ 1.2V
– 0.5 V
– 0.6 V
Adjustment Part
<confirmation> <confirmation>
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L4
CT3
620 kHz
1,400 kHz
• 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.
Lastly check the voltage.
digital
voltmeter
voltmeter
100 k
Ω
TP (VT)
(JW17)
(JW17)
2
jack (J301)
set
32
Ω
level meter
(range: 0.5–5 V ac)
(range: 0.5–5 V ac)
Put the lead-wire
antenna close to
the set.
antenna close to
the set.
AM RF signal
generator
generator
TP (FM ANT)
FM RF signal
generator
generator
0.01
µ
F
set
TUNER SECTION 0 dB = 1 µV
• FM Section
Setting:
RADIO (BAND) button: FM
RADIO (BAND) button: FM
75 kHz frequency
deviation by 1 kHz signal
output level : as low as possible
deviation by 1 kHz signal
output level : as low as possible
• AM Section
Setting:
RADIO (BAND) button: AM
RADIO (BAND) button: AM
30% amplitude
modulation by
400 Hz signal
modulation by
400 Hz signal
• Connecting Level Meter (FM and AM)
• Connecting Digital Voltmeter (FM and AM)
• Repeat the procedures in each adjustment several times, and the
frequency coverage and tracking adjustments should be finally
done by the trimmer capacitors.
done by the trimmer capacitors.
3.0
±
1.0 mm
L3
AM
FERRITE-ROD
ANTENNA
AM
FERRITE-ROD
ANTENNA
Adjustment Location: See page 14.
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