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

DIAL POINTER INSTALLATION

Note : Follow the installation procedure in the numerical order given.
2 Pointer
1 Rack
Chassis
Claws
6
Main board
Gear (B),tuning capacitor
4
Stopper
3
B Hole 2
Spring (gear)
Hole
1
Gear (A),tuning capacitor
A Projection
1 Put a point of spring (gear) in a hole of "gear (A), tuning
capacitor" and install it.
2 Install "gear (B), tuning capacitor" in a direction as a figure.
3 Turn the "gear (B), tuning capacitor" till a position of B fits
A.
4 Hang the spring (gear) with a stopper.
SECTION 3
Chassis
Rack
4 Scribed line
5 Knob (tone)
3 Knob (tune)
1 Insert the rack into the chassis groove.
2 Install the pointer.
5
3 Install the knob (tune).
4 Slide the rack and align it with the groove on the scribed
S2
line.
5 Align the knob (tone) and the S2.
6 Install the chassis to the main board.
3 Screw (1.7x3)
2 Gear ASSY
Spring
(gear)
Knob (tune)
Main board
1
1 Turn the CV shaft all thye way counterclockwise.
2 Set the gear ASSY onto the CV shaft in a
direction as a figure.
3 Secure the gear ASSY with screw.
– 5 –
TUNER SECTION
0dB=1µV
MW Section
Procedure :
BAND : MW
AM RF signal
generator
30% amplitude modulation by 400Hz
signal.
Output level : as low as possible
SW Section
Procedure :
BAND : SW
AM RF signal
generator
30% amplitude modulation by
400Hz signal.
Output level : as low as possible
FM Section
Procedure :
BAND : FM
FM RF signal
generator
22.5kHz frequency deviation by
400Hz signal.
Output level : as low as possible
32 Ω
set
phone jack (J1)
Adjustment Location : Main board (Component side)
L3 : FM Tracking Adjustment
L4 : FM Frequency Coverage Adjustment
CV shaft
T1 : AM IF Adjustment
L5 : MW Frequency Coverage Adjustment
SECTION 4

ELECTRICAL ADJUSTMENTS

• Repeat the procedures in each adjustment several times, and the
frequency coverage and tracking adjustments should be finally
done by the trimmer capacitors.
AM IF ADJUSTMENT
Adjust for a maximum reading on level meter.
T1
Put the lead-wire
antenna close to
the set. MW FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter.
L5
CT4
MW TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L1
CT1
SW FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter.
12PF
telescopic L6
antenna
CT6
terminal
SW TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L2
CT5
FM FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter.
L4
CT3
0.01 µ F
telescopic
FM TRACKING ADJUSTMENT
antenna
terminal Adjust for a maximum reading on level meter.
L3
CT2
level meter
L1 : MW Tracking Adjustment
CT2 : FM Tracking Adjustment
CT3 : FM Frequency Coverage Adjustment
CT1 : MW Tracking Adjustment
CT4 : MW Frequency Coverage Adjustment
CT5 : SW Tracking Adjustment
L2 : SW Tracking Adjustment
CT6 : SW Frequency Coverage Adjustment
L6 : SW Frequency Coverage Adjustment
– 6 –
< > : Saudi Arabia model
455kHz
520kHz
1,650kHz
620kHz
1,400kHz
5.8MHz
18.5MHz
5.8MHz
18.5MHz
86.5MHz <87.35MHz>
109.5MHz <108.25MHz>
86.5MHz <87.35MHz>
109.5MHz <108.25MHz>