Electrical Adjustments - Sony ICF-DVD57TV Service Manual

ICF-DVD57TV
0 dB=1 µV
TUNER SECTION
[AM]
Setting:
Function: RADIO
Band: AM
Put the lead-wire
AM RF signal
antenna close to
generator
the set.
set
30% amplitude
modulation by
400 Hz signal
Output level:
as low as possible
[FM]
Setting:
Function: RADIO
Band : FM
TU board
FM RF signal
TP (ANT)
generator
0.01 µ F
set
22.5 kHz frequency
deviation by 400 Hz
TU board
signal
TP (GND)
Output level:
as low as possible
TU board
100 k Ω
TP (VT)
TP (GND)
• Repeat the procedures in each adjustment several times, and
the tracking adjustments should be finally done by the trimmer
capacitors.
16
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SECTION 5

ELECTRICAL ADJUSTMENTS

MAIN board
CN302 pin 1
level meter
6 Ω
+
–
MAIN board
CN302 pin 2
MAIN board
CN302 pin 1
level meter
6 Ω
+
–
MAIN board
CN302 pin 2
digital voltmeter
AM IF ADJUSTMENT
Adjust for a maximum reading on level meter
T1
AM VCO VOLTAGE ADJUSTMENT
Adjustment Part Frequency Display Reading on Digital Voltmeter
Confirmation 530 kHz
L4 1,710 kHz
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L3
CT3
FM IF ADJUSTMENT
Adjust for a minimum reading on level meter
T2
FM VCO VOLTAGE ADJUSTMENT
Adjustment Part Frequency Display Reading on Digital Voltmeter
Confirmation 87.5 MHz
L2 108 MHz
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L1
CT1
Adjustment and Connecting Location:
TU board (See page 17)
450 kHz
1.0 ± 0.1 V
5.3 ± 0.7 V
620 kHz
1,400 kHz
10.7 MHz
1.3 ± 0.2 V
3.0 ± 0.2 V
87.5 MHz
108 MHz