Sony ICF-C713L Service Manual ▷ View online
– 5 –
2-3. BASE CABINET (UPPER)
2-4. CABINET (REAR)
4
base cabinet (upper)
3
claw
1
claw
2
claw
4
cabinet (rear)
2
claws
3
claws
1
claws
– 6 –
2-5. MAIN BOARD
2
P 2x10
3
MAIN board
1
P 2x10
– 7 –
FM VCO VOLTAGE ADJUSTMENT
Adjust for the following value reading on digital voltmeter.
Adjustment Part
(confirmation)
L4
Frequency Display
87.5 MHz
108 MHz
Reading on Digital
More than 1.2 V
9.5 ± 1.0 V
voltmeter
(Standard 1.6 V)
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L3
CT3
87.5 MHz
108 MHz
AM IF ADJUSTMENT
Adjust for a maximum reading on level meter.
T1
450 kHz
LW VCO VOLTAGE ADJUSTMENT
Adjust for the following value reading on digital voltmeter.
Adjustment Part
(confirmation)
CT4
Frequency Display
153 kHz
279 kHz
Reading on Digital
More than 2.2 V
9.0 V
voltmeter
(Standard 2.4 V)
LW TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L2-2
CT1
162 kHz
243 kHz
MW VCO VOLTAGE ADJUSTMENT
Adjust for the following value reading on digital voltmeter.
Adjustment Part
L5
(confirmation)
Frequency Display
531 kHz
1,602 kHz
Reading on Digital
2.85 V
Less than 10 V
voltmeter
(Standard 9 V)
MW TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L2-1
CT2
621 kHz
1,404 kHz
Adjustment Location : See page 8.
22.5 kHz frequency
deviation by 400 Hz signal
Output level : as low as possible
deviation by 400 Hz signal
Output level : as low as possible
30 % amplitude
modulation by 400 Hz signal
Output level : as low as possible
modulation by 400 Hz signal
Output level : as low as possible
• FM Section
Setting :
RADIO ON button : On
BAND button
RADIO ON button : On
BAND button
: FM
• LW/MW Section
Setting :
RADIO ON button : On
BAND button
RADIO ON button : On
BAND button
: LW/MW
• Connecting Level Meter (FM, LW and MW)
• Repeat the procedures in each adjustment several times, and the
tracking adjustments should be finally done by the trimmer
capacitors.
capacitors.
0 dB = 1 µV
SECTION 3
ELECTRICAL ADJUSTMENTS
telescopic antenna
input terminal
input terminal
0.01
µ
F
set
FM RF signal
generator
generator
AM RF signal
generator
generator
Put the power cord
antenna close to
the set.
antenna close to
the set.
level meter
(range: 0.5 - 5 V ac)
(range: 0.5 - 5 V ac)
8
Ω
• Connecting Digital Voltmeter (FM, LW and MW)
digital
voltmeter
voltmeter
speaker terminal
set
TP (VT)
– 8 –
Adjustment Location : main board
–main board (component side) –
L4
FM VCO
VOLTAGE
ADJ
FM VCO
VOLTAGE
ADJ
CT1
LW
TRACKING
ADJ
LW
TRACKING
ADJ
CT2
CT3
FM
TRACKING
ADJ
L2-2
LW
TRACKING
ADJ
AM IF
ADJ
T1
LW VCO
VOLTAGE
ADJ
CT4
CT4
MW VCO
VOLTAGE
ADJ
L5
MW
TRACKING
ADJ
L3
L2-1
–main board (conductor side) –
mark
CF2
CF3
mark
HOW TO CHANGE THE CERAMIC FILTERS
This model is used two ceramic filters of CF2 and 3.
You must use same type of color marked ceramic filters in order to
meet same specifications.
Therefore, the ceramic filter must change two pieces together since
it's supply two pieces in one package as a spare parts.
You must use same type of color marked ceramic filters in order to
meet same specifications.
Therefore, the ceramic filter must change two pieces together since
it's supply two pieces in one package as a spare parts.
Center
Frequency
Frequency
red
10.70 MHz
blue
10.67 MHz
orange
10.73 MHz
black
10.64 MHz
white
10.76 MHz
mark
TP
(VT)
FM/LW/MW
VCO VOLTAGE
ADJ
(VT)
FM/LW/MW
VCO VOLTAGE
ADJ
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