Section 3 Electrical Adjustments - Sony ICF-303L Service Manual

ELECTRICAL ADJUSTMENTS
FM SECTION
BAND switch : FM
FM RF signal telescopic
generator antenna terminal
0.01 µ F
set
400Hz, 30% FM modulation
frequency deviation ± 22.5kHz
Output level: as low as possible
level meter
16 Ω
set
earphone jack (EPJ1)
• Repeat the procedures in each adjustment several times, and the
frequency coverage and tracking adjustments should be finally
done by the trimmer capacitors.
ICF-303:
FM FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter
86.5 (87.35)
L4
<64> MHz
CT1-3 109.5 (108.25) MHz
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
86.5 (87.35)
L2
<68> MHz
109.5 (108.25)
CT1-2
<102> MHz
NOTE : (
) : Italian model
< > : East European model
ICF-303L:
FM FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter
L4 86.5 MHz
CT1-3 109.5 MHz
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L2 86.5 MHz
CT1-2 109.5 MHz
SECTION 3
ICF-303:
AM SECTION
BAND switch : AM
AM RF signal
Put the lead-wire
generator
antenna close to
the set.
400Hz, 30%
AM modulation
Output level: as low as possible
level meter
16 Ω
set
earphone jack (EPJ1)
• Repeat the procedures in each adjustment several times, and the
frequency coverage and tracking adjustments should be finally
done by the trimmer capacitors.
AM FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter
L5 520 (516.5) kHz
CT1-4 1,650 (1,631.5) kHz
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L1 600 (620) kHz
CT1-1
NOTE : no mark : ( ) : Italian model
– 5 –
ICF-303L:
LW SECTION
BAND switch : LW
AM RF signal
generator
400Hz, 30%
AM modulation
Output level: as low as possible
set
earphone jack (EPJ1)
• Repeat the procedures in each adjustment several times, and the
frequency coverage and tracking adjustments should be finally
done by the trimmer capacitors.
LW FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter
L5
CT1
LW TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L1
1,400 kHz CT2
Adjustment Location: MAIN BOARD
MAIN BOARD (COMPONENT SIDE)
Put the lead-wire
antenna close to
the set.
level meter
16 Ω
145 kHz
265 kHz
160 kHz
240 kHz
L2
FM TRACKING
ADJUSTMENT
CT1-2
FM TRACKING
ADJUSTMENT
L4
FM FREQUENCY
COVERAGE
ADJUSTMENT
CT1-3
FM FREQUENCY
COVERAGE
ADJUSTMENT
CT1
LW FREQUENCY
COVERAGE (303L)
ADJUSTMENT
– 6 –
L1
AM TRACKING (303)
LW TRACKING (303L)
ADJUSTMENT
CT2
LW TRACKING( 303L)
ADJUSTMENT
(303L)
CT1-1
AM TRACKING (303)
ADJUSTMENT
CT1-4
AM FREQUENCY
COVERAGE (303)
ADJUSTMENT
(303L)
L5
AM FREQUENCY COVERAGE (303)
LW FREQUENCY COVERAGE (303L)
ADJUSTMENT