Sony ICF-SW1 - Section 4 Electrical Adjustments; AM Section Adjustments; FM Section Adjustments

NOTE: This adjustment should be performed after the remove Rod-
Antenna (ANT1).
This adjustment should be performed after the FM FRE-
QUENCY-COVERAGE ADJUSTMENT.
FM TRACKING ADJUSTMENT
1st/2nd IF ADJUSTMENT
Setup:
VOLUME control: as required
Setup:
VOLUME control: as required
VTVM
FM RF SSG (DC range)
AM RF SSG
Put the lead-wire
antenna close to
the set.
C—_— frequency deviation:
22,5 kHz by 400 Hz
400 Hz, 30% signal.
AM modulation
VTVM
SECTION 5
DIAGRAMS 140
FM/AM FRONT END, et
5-1. BLOCK DIAGRAM
° (2)
Fu/sw | ane atid
TELESCOPIC 03
0420
iF
AMP,
DET
:
RV6O!
FM IF
(5) DISCRI 2)
AM IF
/DET/AGC
LOW ~ PASS
FILTER
HIGH CUT
SWITCH
405
METER
(6)
MUTING
| Q606 607
BAND SWITCH
(FM/AM)
040!
B+(+3V)
(AC range)
EARPHONE
Procedure:
@ ist IF ADJUSTMENT
1. Set the frequencies of the AM RF SSG and the frequency dis-
play of the set to 156 kHz.
2. Adjust T3 and T4 to obtain a maximum reading on the VTVM.
@ 2nd IF ADJUSTMENT
1. Set the frequencies of the AM RF SSG and the frequency dis-
play of the set to 156 kHz.
2. Adjust T5 to obtain a maximum reading on the VTVM.
@ FM SECTION
FM FREQUENCY COVERAGE (VCO VOLTAGE)
ADJUSTMENT
Setup:
VOLUME control: as required
ba ta (MAIN BOARD)
a (SIDE B)
VTVM
(DC range)
Procedure:
1. Tune the set to 108 MHz.
2. Adjust T403 to obtain a 11.9 — 12.1 Von the VTVM.
{MAIN BOARD]
(SIDE B)
Procedure:
1. Set the frequencies of the FM RF SSG and the frequency display of
the set to 76 MHz.
. Adjust T401 and T402 to obtain a maximum reading on the VTVM.
. Set the frequencies of the FM RF SSG and the frequency display of
the set to 108 MHz.
. Adjust C401 and CT402 to obtain a maximum reading on the
VTVM.
. Repeat the above steps several times, and finish the adjustment with
the trimmers CT401 and CT402.
FM STEREO ADJUSTMENT
Setup:
VOLUME control: as reguired
frequency
counter
=e
[MAIN BOARD]
(SIDE B)
Procedure:
1. Adjust RV401 to obtain a 75.9 — 76.1 kHz on the frequency
counter.
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AN-101
5-2. SEMICONDUCTOR LEAD LAYOUTS
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(KEY BOARD]
(MICRO COMPUTER BOARD)