Tuner Section - Sony CFD-S22 Service Manual

TUNER SECTION

0 dB = 1 µV
• FM Section
Setting:
RADIO (BAND) button: FM
FM RF signal
generator
75 kHz frequency
deviation by 1 kHz signal
output level : as low as possible
• AM Section
Setting:
RADIO (BAND) button: AM
AM RF signal
generator
30% amplitude
modulation by
400 Hz signal
• Connecting Level Meter (FM and AM)
set
i jack (J321)
• Connecting Digital Voltmeter (FM and AM)
100 k
TP (VT)
• Repeat the procedures in each adjustment several times, and the
frequency coverage and tracking adjustments should be finally
done by the trimmer capacitors.
TP (JW2)
0.01 F
set
Put the lead-wire
antenna close to
the set.
level meter
(range: 0.5–5 V ac)
32
digital
voltmeter
FM FREQUENCY COVERAGE
Frequency Display
Reading on Digital voltmeter
Adjustment Part
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L1
87.5 MHz
AM FREQUENCY COVERAGE
Frequency Display
Reading on Digital voltmeter
Adjustment Part
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L3
620 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.
– 15 –
ADJUSTMENT
87.5 MHz 108 MHz
1.6 ± 0.4 V 4.0 ± 0.3V
<confirmation>
CT1
108 MHz
ADJUSTMENT
530 kHz 1,710 kHz
1.1 ± 0.1 V 5.2 ± 0.8V
L4 <confirmation>
CT3
1,400 kHz
L2