Tuner Section - Sony CFD-ZW750 Service Manual

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TUNER SECTION

• 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
TE
L 13942296513
• Connecting Level Meter (FM and AM)
set
• Connecting Digital Voltmeter (FM and AM)
TP (VT)
(JW13)
• Repeat the procedures in each adjustment several times, and the
frequency coverage and tracking adjustments should be finally
done by the trimmer capacitors.
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0 dB = 1 µV
FH1
0.01 µ F
set
Put the lead-wire
antenna close to
the set.
level meter
(range: 0.5–5 V ac)
32 Ω
PHONES jack
digital
voltmeter
100 k Ω
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8
Frequency Display
Reading on Digital voltmeter
Adjustment Part
Adjust for a maximum reading on level meter.
87.5 MHz
Frequency Display
Reading on Digital voltmeter 0.85 ± 0.05 V
Adjustment Part
Adjust for a maximum reading on level meter.
620 kHz
• For AM adjustment, fix the ferrite-rod antenna (L3) as shown
below and then perform tracking adjustment at L4 and CT2.
Lastly check the voltage.
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Adjustment Location: See page 14.
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2 9 9 4 2 8
FM FREQUENCY COVERAGE
ADJUSTMENT
87.5 MHz
1.6 ± 0.2 V
<confirmation>
FM TRACKING ADJUSTMENT
L1
AM FREQUENCY COVERAGE
ADJUSTMENT
530 kHz
<confirmation> <confirmation>
AM TRACKING ADJUSTMENT
L4
1,400 kHz
1 5 0 5 3.0 ± 1.0 mm 8 2 9 9 4
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co
9 9
108 MHz
3.8 ± 0.3V
L2
CT1
108 MHz
1,710 kHz
5.1 ± 0.3V
CT2
2 8 9 9
L3
FERRITE-ROD
ANTENNA