Section 3 Electrical Adjustments - Sony ICF-S79 Service Manual

0dB=1 µV
[FM/TV Section]
Setting:
BAND switch: FM1 or TV
FM RF SSG
0.01 µ F
± 22.5 kHz frequency
deviation by 400 Hz
FM lead wire antenna terminal
signal
Output level: as low as possible
[AM (LW/MW) Section]
Setting:
BAND switch: AM (MW) or LW
Put the lead-wire
antenna close to
AM RF SSG
the set.
set
30% amplitude
modulation by
400 Hz signal
Output level: as low as possible
MAIN board
TP
(VT)
Repeat the procedures in each adjustment several times, and the
frequency coverage and tracking adjustments should be finally done
by the trimmer capacitors.
ICF-S79V only
TV FREQUENCY COVERAGE ADJUSTMENT
Adjust for a reading on digital voltmeter.
L2 WEATHER 2 ch
Confirm TV 13 ch
Note: Not use the FM RF signal generator in this adjustment.
ICF-S79V only
TV TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L1
CT1
ICF-S79V only
TV IF ADJUSTMENT
Adjust for a maximum reading on level meter.
T1
SECTION 3
ELECTRICAL ADJUSTMENTS
level meter
+
set
–
speaker terminal
level meter
+
–
speaker terminal
digital voltmeter
+
–
1.0 ± 0.1 V
10 ± 0.5 V
WEATHER 2 ch (162.40 MHz)
TV 13 ch (215.75 MHz)
10.7 MHz
FM FREQUENCY COVERAGE ADJUSTMENT
Adjust for a reading on digital voltmeter.
L8
Confirm
Note: Not use the FM RF signal generator in this adjustment.
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L6
CT4
ICF-S79L only
LW FREQUENCY COVERAGE ADJUSTMENT
Adjust for a reading on digital voltmeter.
CT5
Confirm
Note: Not use the AM RF signal generator in this adjustment.
ICF-S79L only
LW TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L5 (LW side)
CT2
AM (MW) FREQUENCY COVERAGE ADJUSTMENT
Adjust for a reading on digital voltmeter.
L9
Confirm 1,602 kHz (1,710 kHz)
Note: Not use the AM RF signal generator in this adjustment.
AM (MW) TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L5 <MW side>
CT3
AM IF ADJUSTMENT
Adjust for a maximum reading on level meter.
T2
– 5 –
87.5 MHz (TV 2 ch) 2.3 ± 0.1 V (1.0 ± 0.1 V)
108.0 MHz 8.5 ± 0.5 V (12.5 ± 0.5 V)
( ): ICF-S79V
87.5 MHz (TV 2 ch (59.75 MHz))
108.0 MHz
( ): ICF-S79V
153 kHz 2.3 ± 0.1 V
279 kHz 8.5 ± 0.5 V
162 kHz
243 kHz
531 kHz (530 kHz) 2.8 ± 0.1 V
9.5 ± 0.5 V
( ): ICF-S79V
621 kHz (590 kHz)
1,395 kHz (1,490 kHz)
< >: ICF-S79L
( ): ICF-S79V
455 kHz