Electrical Adjustment - Sony ICF-C723 Service Manual

AM Section
Band button : AM (ICF-C723)
: MW or LW (ICF-C723L)
Volume : MAX
AM RF signal
generator
30% amplitude modulation by 400Hz
signal.
Output level : as low as possible
FM Section
Band button : FM
Volume : MAX
FM RF signal
generator
22.5kHz frequency
deviation by 400Hz signal.
Output level :
as low as possible
set
speaker terminal
[MAIN BOARD] (Conductor side)
6 5 4 3
W705
C15
SECTION 3
ELECTRICAL ADJUSTMENTS
Put the lead-wire
antenna close to
the set.
0.01 F
set
FM ANT IN
level meter
8 Ω
digital
voltmeter
C55
2 1
• Repeat the procedures in each adjustment several times, and the
frequency coverage and tracking adjustments should be finally
done by the trimmer capacitors.
( ) : AEP, UK, Italian, Australian, E model only
AM IF ALIGNMENT
Adjust for a maximum reading on level meter.
T1
AM <MW> FREQUENCY COVERAGE ADJUSTMENT
Adjust parts Frequecy display
L6 530kHz (531kHz)
confirmation 1,710kHz (1,602kHz)
AM <MW> TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L3 :ICF-C723
L3–1 :ICF-C723L
CT1
ICF-C723L
LW FREQUENCY COVERAGE ADJUSTMENT
Adjust parts Frequecy display
confirmation
CT4
LW TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L3 – 2
CT2
FM FREQUENCY COVERAGE ADJUSTMENT
Adjust parts Frequecy display
L5
confirmation
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L4
CT3
Adjustment Location
– 6 –
455kHz
Reading on digital
voltmeter
2.5 ± 0.1V (ICF-C723)
2.65 ± 0.1V (ICF-C723L)
Less than 11.0V
Standard 9.5V
(Less than 10.0V)
(Standard 9.0V)
580kHz (621kHz)
1,490kHz (1,404kHz)
Reading on digital
voltmeter
More than 2.2V
153kHz
(Standard 3V)
279kHz 9.0 ± 0.1V
162kHz
243kHz
Reading on digital
voltmeter
87.5MHz 3.0 ± 0.1V
108.0MHz 10 ± 1V
87.5MHz
108MHz
: Main board (See page 8)