Tuner Section - Sony CFD-W57 Service Manual

0 dB = 1 µV

TUNER SECTION

• FM Section
Setting:
BAND switch: FM
FM RF signal
generator
0.01 µ F
22.5 kHz frequency
deviation by 1 kHz signal
Output level : as low as possible
• AM Section
Setting:
BAND switch: AM
AM RF signal
generator
30% amplitude
modulation by 400 Hz signal
Output level : as low as possible
• Connecting Level Meter (FM and AM)
32 Ω
set
2 jack
• Connecting Digital Voltmeter (FM and AM)
100 k Ω
JW16
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.
antenna terminal
(FH1)
set
Put the lead-wire
antenna close to
the set.
level meter
(range: 0.5-5 V ac)
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
Adjustment Location: See page 18.
– 17 –
ADJUSTMENT
87.5 MHz 108 MHz
1.4 ± 0.2 V 4.7 ± 0.1 V
<confirmation>
CT1
108 MHz
ADJUSTMENT
530 kHz 1,710 kHz
1.0 ± 0.1 V 5.3 ± 0.2 V
L4 <confirmation>
CT2
1,400 kHz
L2