Tuner Section - Sony CFD-E75L Service Manual

TUNER SECTION

[MW/LW]
Setting:
Function : RADIO
RADIO BAND button : MW or LW
Put the lead-wire
AM RF signal
antenna close to
generator
the set.
30% amplitude
modulation by
400 Hz signal
Output level:
as low as possible
[FM]
Setting:
Function : RADIO
RADIO BAND button: FM
TUNER board
FM RF signal
TP (ANT)
generator
0.01 µF
22.5 kHz frequency
deviation by 400 Hz
TUNER board
signal
TP (GND)
Output level:
as low as possible
TUNER 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.
0 dB=1 µV
POWER board
CNP392 pin 1
level meter
3.2 Ω
+
set
–
POWER board
CNP392 pin 2
POWER board
CNP392 pin 1
level meter
3.2 Ω
+
set
–
POWER board
CNP392 pin 2
digital voltmeter
100 k Ω
AM IF ADJUSTMENT
Adjust for a maximum reading on level meter
T1
MW VCO VOLTAGE ADJUSTMENT
Frequency Display
531 kHz
1,611 kHz
MW TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L3-1
CT3
LW VCO VOLTAGE ADJUSTMENT
Adjustment Part Frequency Display Reading on Digital Voltmeter
L4 153 kHz
Confirmation 279 kHz
LW TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L3-2
CT5
FM IF ADJUSTMENT
Adjust for a minimum reading on level meter
T2
FM VCO VOLTAGE ADJUSTMENT
Adjustment Part Frequency Display Reading on Digital Voltmeter
L2 108 MHz
Confirmation 87.5 MHz
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L1
CT1
Adjustment Location: TUNER and POWER board (See page 16)
CFD-E75L
450 kHz
Reading on Digital Voltmeter
0.9 ± 0.5 V
5.2 ± 0.6 V
621 kHz
1,404 kHz
0.6 ± 0.3 V
5.0 ± 0.15 V
162 kHz
261 kHz
10.7 MHz
3.0 ± 0.3 V
1.3 ± 0.4 V
87.5 MHz
108 MHz
15