Tuner Section - Sony CFD-E55L Service Manual

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3 7 63 1515 0

TUNER SECTION

[MW/LW]
Setting:
Function : RADIO
BAND button : MW or LW
AM RF signal
generator
30% amplitude
modulation by
400 Hz signal
Output level: as low as possible
[FM]
Setting:
Function : RADIO
BAND button: FM
FM RF signal
generator
22.5 kHz frequency
deviation by 400 Hz
signal
Output level: as low as possible
TE
L 13942296513
MAIN board
TP (VT)
TP (GND)
• Repeat the procedures in each adjustment several times, and the
tracking adjustments should be finally done by the trimmer ca-
pacitors.
• Remove FM antenna in FM adjustment.
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0 dB=1 µV
MAIN board
Put the lead-wire
CNP311 pin 4
antenna close to
level meter
the set.
3.2 Ω
set
MAIN board
CNP311 pin 3
MAIN board
CNP311 pin 4
MAIN board
TP (ANT)
0.01 µ F
3.2 Ω
set
MAIN board
MAIN board
TP (GND)
CNP311 pin 3
digital voltmeter
100 k Ω
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8
T1
Frequency Display
+
–
L3-1
CT2
Adjustment Part Frequency Display Reading on Digital Voltmeter
L4
Confirmation
level meter
L3-2
+
–
CT3
Adjustment Part Frequency Display Reading on Digital Voltmeter
L2
Q Q
3 6 7 1 3
Confirmation
L1
CT1
Adjustment Location: MAIN board (See page 14)
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– 13 –
2 9 9 4 2 8
AM IF ADJUSTMENT
Adjust for a maximum reading on level meter
450 kHz
MW VCO VOLTAGE CONFIRMATION
Reading on Digital Voltmeter
531 kHz
1,611 kHz
MW TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
621 kHz
1,404 kHz
LW VCO VOLTAGE ADJUSTMENT
153 kHz
279 kHz
LW TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
162 kHz
261 kHz
FM VCO VOLTAGE ADJUSTMENT
108 MHz
1 5 0 5 8 2 9 9 4
87.5 MHz
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
87.5 MHz
108 MHz
m
co
9 9
1.0 ± 0.3 V
5.0 ± 0.4 V
+ 0.1 V
0.6
– 0.05 V
4.7 ± 0.5 V
4.0 ± 0.1 V
2 8 9 9
1.6 ± 0.2 V