Electrical Adjustments - Sony ICF-SW20 Service Manual

Fm/mw/sw 1-7 9 band receiver
Table of Contents

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SECTION
2
ELECTRICAL ADJUSTMENTS
[MW SECTION]
BAND switch:
MW
AM rf signal
generator
Put the lead-wire
antenna close to
the set.
IS
30% amplitude modulation
by 400 Hz signal
Output level: as low as possible
[SW SECTION]
BAND switch:
SW
AM rf signal
generator
7pF
t—— ANT IN
i"
30% amplitude modulation
by 400 Hz signal
.
Output level: as low as possible
[FM
SECTION]
BAND
switch:
FM
FM
rf signal
generator
0.01 uF
t——
ANT IN
i"
400 Hz, 30% FM modulation
frequency deviation +22.5 kHz
Output level: as low as possible
VTVM
st
[oo :
EARPHONE jack
e Repeat the procedures in each adjustment serveral
times, and the frequency coverage and tracking
adjustments should be finally done by the trim-
mer capacitors.
eSWI1
to 7 Tracking Adjustment frequencies are
in a line on the scale.
Therefore, on adjusting, first SW1 6.1 MHz and
after adjust SW2 to 7 Tracking without moving
the dial pointer.
( ): AEP, UK, Saudi Arabian model
MW
IF ADJUSTMENT
Adjust for a maximum reading on
VT VM.
455 kHz
SW
IF (1) ADJUSTMENT
Adjust for a maximum reading on VT VM.
10.6 MHz
SW
IF (2) ADJUSTMENT
Adjust for a maximum reading on
VI VM.
455 kHz
SW1
TRACKING
ADJUSTMENT
:
Adjust for a maximum reading on VT VM.
6.1 MHz
SW2
TRACKING
ADJUSTMENT
Adjust for a maximum reading on
VT VM.
7.2 MHz
SW3 TRACKING
ADJUSTMENT
Adjust for a maximum reading on VT VM.
9.7 MHz
SW4
TRACKING
ADJUSTMENT
Adjust for a maximum reading on VI VM.
11.94 MHz
SW5
TRACKING
ADJUSTMENT
Adjust for a maximum reading on VIVM.
15.325 MHz
SW6
TRACKING
ADJUSTMENT
Adjust for a maximum reading on
VT VM.
17.825 MHz
|
SW7
TRACKING
ADJUSTMENT
Adjust for a maximum reading on VIT'VM.
21.65 MHz
i
Adjust fora maximum readingon VTVM.
>
[PARTS
ARRANGEMENT
DIAGRAM
FOR
ADJUSTMENT]
— Conductor Side —
ANTI
FM
TELESCOPIC
ANTENNA
ANT IN
RVI.
L3
L4
L5
L6
.
L7
SWS3
SW4
SW5
SW6
SW7
T2
Tracking
Tracking
Tracking
Tracking
Tracking
MW
Adjustment
Adjustment
Adjustment
Adjustment
Adjustment
L1
sSWw1
Main Board
iO IG
— Component Side —
T3
SW IF (2)
Adjustment
SW
T4
Frequency
Tracking
Adjustment
CT1 | Coverage
Adjustment
L2
MW
SW2
CT11-3
Frequency
Tracking
L17
Coverage
Adjustment
Adjustment
14
L15
CT11-1
eee oe
CT11-2 | FM
7
SW IF (1)
FM Tracking
Frequency Coverage
Adjustment
Adjustment
L16.
Adjustment

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