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Dial Pointer Installation; Electrical Adjustments - Sony ICF-403L Service Manual

Fm/mw/lw 3 band radio.
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DIAL POINTER INSTALLATION

Note : Follow the installation procedure in the numerical order given.
2 Pointer
1 Rack
Chassis
Claws
6
Main board
3 Screw (1.7x3)
2 Gear (A),tuning capacitor
Knob (tune)
Main board
1
SECTION 3
Chassis
Rack
4 Scribed line
5 Knob (tone)
3 Knob (tune)
5
S2
1 Insert the rack into the chassis groove.
2 Install the pointer.
3 Install the knob (tune).
4 Slide the rack and align it with the groove on the scribed line.
5 Align the knob (tone) and the S2.
6 Install the chassis to the main board.
CV shaft
1 Turn the CV shaft all thye way counterclockwise.
2 Set the gear (A), tuning capacitor onto the CV shaft in a
direction as a figure.
3 Secure the gear (A), tuning capacitor with screw.
– 5 –

ELECTRICAL ADJUSTMENTS

TUNER SECTION
MW/LW Section
Procedure :
BAND
: MW/LW
VOLUME : MIN
AM RF signal
Put the lead-wire
generator
antenna close to
the set.
30% amplitude modulation by 400Hz
signal.
Output level : as low as possible
FM Section
Procedure :
BAND
: FM
VOLUME : MIN
FM RF signal
generator
0.01 µ F
telescopic
antenna
terminal
22.5kHz frequency deviation by
400Hz signal.
Output level : as low as possible
level meter
32 Ω
set
phone jack (J1)
Adjustment Location : Main board (Component side)
L1-2 : LW Tracking Adjustment
T1 : AM IF Adjustment
L3 : FM Tracking Adjustment
SECTION 4
• Repeat the procedures in each adjustment several times, and the
frequency coverage and tracking adjustments should be finally
done by the trimmer capacitors.
<
> : East European model
AM IF ADJUSTMENT
Adjust for a maximum reading on level meter.
T1
455kHz
MW FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter.
L5
520kHz
CT4
1,650kHz
MW TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L1-1
620kHz
CT1
1,400kHz
LW FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter.
Confirm
145kHz
CT5
260kHz
LW TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L1-2
160kHz
CT6
240kHz
FM FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter.
L4
86.5MHz <64.0MHz>
CT3
109.5MHz <109.5MHz>
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L3
86.5MHz <68.0MHz>
CT2
109.5MHz <102.0MHz>
L1-1 : MW Tracking Adjustment
CT2 : FM Tracking Adjustment
CT3 : FM Frequency Coverage Adjustment
CT1 : MW Tracking Adjustment
CT4 : MW Frequency Coverage Adjustment
CT6 : LW Tracking Adjustment
CT5 : LW Frequency Coverage Adjustment
L5 : MW Frequency Coverage Adjustment
L4 : FM Frequency Coverage Adjustment
– 6 –

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