Read Sony ICF-903L Service Manual online
FM VT VOLTAGE ADJUSTMENT
Frequency Display
86.5 MHz
Reading on Digital voltmeter
1.0 ± 0.1 V
Adjustment Part
RV201
16
Ω
set
v
jack (EPJ1)
level meter
telescopic
antenna terminal
antenna terminal
0.01
µ
F
FM RF signal
generator
generator
400Hz, 30% FM modulation
frequency deviation
frequency deviation
±
22.5kHz
Output level: as low as possible
set
16
Ω
set
v
jack (EPJ1)
level meter
telescopic
antenna terminal
antenna terminal
12 pF
AM RF signal
generator
generator
400Hz, 30%
AM modulation
Output level: as low as possible
AM modulation
Output level: as low as possible
set
– 7 –
– 8 –
Adjustment Location: MAIN BOARD
• Repeat the procedures in each adjustment several times, and the
frequency coverage and tracking adjustments should be finally
done by the trimmer capacitors.
done by the trimmer capacitors.
SW FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter
L6
5.8 MHz
CT5
18.5 MHz
SW TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L3
5.8 MHz
CT3
18.5 MHz
3-3. SW SECTION
BAND switch : SW
• Repeat the procedures in each adjustment several times, and the
frequency coverage and tracking adjustments should be finally
done by the trimmer capacitors.
done by the trimmer capacitors.
FM FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter
L8
86.5 MHz
CT8
109.5 MHz
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L9, L10
86.5 MHz
CT7
109.5 MHz
3-4. FM SECTION
BAND switch : FM
SW
TRACKING
ADJUSTMENT
L2-2
LW
TRACKING
ADJUSTMENT
MW
FREQUENCY
COVERAGE
ADJUSTMENT
CT6
LW
FREQUENCY
COVERAGE
ADJUSTMENT
RV201
FM
VT VOLTAGE
ADJUSTMENT
FM
FREQUENCY
COVERAGE
ADJUSTMENT
T1
MW
IF
ADJUSTMENT
FM
TRACKING
ADJUSTMENT
– MAIN BOARD (COMPONENT SIDE) –
SW
FREQUENCY
COVERAGE
ADJUSTMENT
L2-1
MW
TRACKING
ADJUSTMENT
CT1
MW
TRACKING
ADJUSTMENT
CT2
LW
TRACKING
ADJUSTMENT
TP9 (VT)
(conductor side)
L9, L10, CT7
L5, CT4
CT5, L6
L3
CT3
L8
CT8
• Connecting Digital Voltmeter
digital
voltmeter
tuner board
TP9 (VT)
TP9 (VT)
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