Read Sony ICF-S79W Service Manual online
ICF-S79W
4
SECTION 4
ELECTRICAL ADJUSTMENTS
[FM/WEATHER Section]
Setting:
BAND button: FM1
WEATHER button: WEATHER
Setting:
BAND button: FM1
WEATHER button: WEATHER
FM RF SSG
± 22.5 kHz frequency
deviation by 400 Hz
signal
Output level: as low as possible
+
–
level meter
speaker terminal
set
FM lead wire antenna terminal
0.01F
[AM Section]
Setting:
BAND button: AM
Setting:
BAND button: AM
AM RF SSG
30% amplitude
modulation by
400 Hz signal
Output level: as low as possible
Put the lead-wire
antenna close to
the set.
+
–
–
level meter
speaker terminal
set
+
–
digital voltmeter
MAIN board
TP (VT)
Repeat the procedures in each adjustment several times, and the
frequency coverage and tracking adjustments should be fi nally
done by the trimmer capacitors.
frequency coverage and tracking adjustments should be fi nally
done by the trimmer capacitors.
0 dB = 1
μV
WB FREQUENCY COVERAGE ADJUSTMENT
Adjust for a reading on digital voltmeter.
L2
WEATHER 2 ch
0.95 ± 0.1 V
Confi rm
WEATHER 1 ch
0.96 ± 0.1 V
Note: Not use the FM RF signal generator in this adjustment.
WB TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L1
WEATHER 2 ch (162.40 MHz)
CT1
WEATHER 1 ch (162.55 MHz)
WB/FM IF ADJUSTMENT
Adjust for a maximum reading on level meter.
L11
10.7 MHz
FM FREQUENCY COVERAGE ADJUSTMENT
Adjust for a reading on digital voltmeter.
L4
87.5 MHz
6.6 ± 0.1 V
Confi rm
108.0 MHz
12.5 ± 0.5 V
Note: Not use the FM RF signal generator in this adjustment.
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L3
87.5 MHz
CT2
108.0 MHz
AM FREQUENCY COVERAGE ADJUSTMENT
Adjust for a reading on digital voltmeter.
L6
530 kHz
2.8 ± 0.1 V
Confi rm
1,710 kHz
9.7 ± 1.0 V
Note: Not use the AM RF signal generator in this adjustment.
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L5
590 kHz
CT3
1,490 kHz
AM IF ADJUSTMENT
Adjust for a maximum reading on level meter.
T1
455 kHz
Adjustment Location: MAIN board (See page 5)
Click on the first or last page to see other ICF-S79W service manuals if exist.