Sony ICF-S79, ICF-S79L, ICF-S79V Service Manual
ICF-S79/S79L/S79V
SERVICE MANUAL
Photo: ICF-S79V
SPECIFICATIONS
US Model
ICF-S79V
AEP Model
ICF-S79/S79L
UK Model
ICF-S79L
MICROFILM
Notes on chip component replacement
• Never reuse a disconnected chip component.
• Notice that the minus side of a tantalum capacitor may be dam-
aged by heat.
ICF-S79
FM/AM SYNTHESIZED RADIO
ICF-S79L
FM/MW/LW SYNTHESIZED RADIO
ICF-S79V
TV/WEATHER/FM/AM SYNTHESIZED RADIO
This section is extracted from
instruction manual.
SECTION 1
GENERAL
– 2 –
– 3 –
SECTION 2
d
DISASSEMBLY
Note: Follow the disassembly procedure in the numerical order given.
REAR CABINET
5
BATT lead (red)
3
two claws
5
antenna lead
4
rear cabinet
2
six screws
(BTP 3
1
×
25)
battery case li
5
BATT lead (white)
– 4 –
SECTION 3
r
ELECTRICAL ADJUSTMENTS
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
signal
Output level: as low as possible
FM lead wire antenna terminal
[AM (LW/MW) Section]
Setting:
BAND switch: AM (MW) or LW
Put the lead-wire
AM RF SSG
30% amplitude
modulation by
400 Hz signal
Output level: as low as possible
antenna close to
the set.
set
set
speaker terminal
level meter
+
–
speaker terminal
level meter
+
–
FM FREQUENCY COVERAGE ADJUSTMENT
Adjust for a reading on digital voltmeter.
L8 87.5 MHz (TV 2 ch)
Confirm 108.0 MHz
Note: Not use the FM RF signal generator in this adjustment.
2.3 ± 0.1 V (1.0 ± 0.1 V)
8.5 ± 0.5 V (12.5 ± 0.5 V)
( ): ICF-S79V
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L6 87.5 MHz (TV 2 ch (59.75 MHz))
CT4 108.0 MHz
( ): ICF-S79V
ICF-S79L only
LW FREQUENCY COVERAGE ADJUSTMENT
Adjust for a reading on digital voltmeter.
CT5 153 kHz 2.3 ± 0.1 V
Confirm 279 kHz 8.5 ± 0.5 V
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) 162 kHz
CT2 243 kHz
MAIN board
TP
(VT)
digital voltmete
+
–
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 1.0 ± 0.1 V
Confirm TV 13 ch 10 ± 0.5 V
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 WEATHER 2 ch (162.40 MHz)
CT1 TV 13 ch (215.75 MHz)
ICF-S79V only
TV IF ADJUSTMENT
Adjust for a maximum reading on level meter.
T1 10.7 MHz
AM (MW) FREQUENCY COVERAGE ADJUSTMENT
Adjust for a reading on digital voltmeter.
L9 531 kHz (530 kHz) 2.8 ± 0.1 V
Confirm 1,602 kHz (1,710 kHz) 9.5 ± 0.5 V
Note: Not use the AM RF signal generator in this adjustment.
( ): ICF-S79V
AM (MW) TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L5 <MW side> 621 kHz (590 kHz)
CT3 1,395 kHz (1,490 kHz)
< >: ICF-S79L
( ): ICF-S79V
AM IF ADJUSTMENT
Adjust for a maximum reading on level meter.
T2 455 kHz
– 5 –
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