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 kΩ
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 µF
set
Put the lead-wire
antenna close to
the set.
level meter
(range: 0.5–5 V ac)
32 Ω
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