Electrical Adjustments - Sony ICF-C763 Service Manual

ICF-C763/C763L
0 dB = 1 µV
TUNER SECTION
• AM Section
Setting:
BAND button: AM <MW and LW>
AM RF signal
generator
30% amplitude
modulation by
400 Hz signal
• FM Section
Setting:
BAND button:FM
FM RF signal
generator
22.5 kHz frequency
deviation by 400 Hz signal
output level : as low as possible
• Connecting Level Meter (FM, AM<MW and LW>)
(range 0.5-5V AC)
32 Ω
SPK+
• Connecting Digital Voltmeter (FM, AM <MW and LW>)
100 kΩ
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.
4
SECTION 2

ELECTRICAL ADJUSTMENTS

< > : ICF-C763L
Put the lead-wire
antenna close to
the set.
TP (ANT)
0.01 µ F
set
level meter
digital
voltmeter
• ICF-C763
AM IF ADJUSTMENT
Adjust for a maximum reading on level meter.
450 kHz
AM FREQUENCY COVERAGE
ADJUSTMENT
Frequency Display 530 kHz [531 kHz] 1,710 kHz [1,602 kHz]
Reading on Digital voltmeter
Adjustment Part
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L1
530 kHz [531kHz]
• ICF-C763L
MW IF ADJUSTMENT
Adjust for a maximum reading on level meter.
450 kHz
MW FREQUENCY COVERAGE
ADJUSTMENT
Frequency Display
2.75 ± 0.1 V
Reading on Digital voltmeter
Adjustment Part
MW TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L1
621 kHz
LW FREQUENCY COVERAGE
ADJUSTMENT
Frequency Display
Reading on Digital voltmeter
Adjustment Part
LW TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L1
162 kHz
• ICF-C763/C763L
FM FREQUENCY COVERAGE
CONFIRMATION
Frequency Display
Reading on Digital voltmeter
Adjustment Part
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L2
87.5 MHz
Adjustment and Connect Location: See page 5.
[ ] : Italian model
T1
3.0 ± 0.1 V 10.0 ± 1.0V[9.0 ± 1.0V]
L4 <confirmation>
CT1
1.490 kHz [1.404kHz]
T1
531 kHz 1.602 kHz
9.0 ± 1.0 V
L4 <confirmation>
CT1
1.404 kHz
153 kHz 279 kHz
2.3 ± 0.3 V 9.0 ± 0.1 V
<confirmation> CT4
CT2
243 kHz
87.5 MHz 108 MHz
3.2 ± 0.3 V 10.0 ± 1.5 V
<confirmation> <confirmation>
CT3
108 MHz