Frequency range:
Model for North and South America
BandICF-S79VChannel step
FM87.5 – 108 MHz 0.1 MHz
AM530 – 1,710 kHz 10 kHz
TV2 – 13 ch—
WEATHER 1 – 5 ch—
Model for other countries
Band
ICF-S79ICF-S79L
FM
87.5 – 108 MHz 87.5 – 108 MHz0.05 MHz*
AM(MW) 531 – 1,602 kHz 531 – 1,602 kHz9 kHz
LW
—153 – 279 kHz9 kHz
* The frequency display is raised or lowered by steps of
0.1 MHz. For example, both 88.00 MHz and 88.05 MHz
will be displayed as “88.0 MHz.”
Time display:
Model for North and South America: 12-hour
system
Model for other countries: 24-hour system
Speaker:
Power output:
Power requirements:
Dimensions: Approx. 143.5 x 139 x 67 mm
Mass: Approx. 523 g (1lb 2oz) incl. batteries
Supplied accessories: Suction cup (1), Strap (1)*
Design and specifications are subject to change
without notice.
1
7.7 cm (3
220 mW (at 10% harmonic distortion)
4.5 V DC, three size C (R14) batteries
(w/h/d) (Approx. 5
inches) incl. projecting parts and controls
*North and South American model only
/8 inches), 8 ohms
3
/4 x 5 1/2 x 2 3/
Channel Step
4
US Model
ICF-S79V
AEP Model
ICF-S79/S79L
UK Model
ICF-S79L
MODEL IDENTIFICATION
There are two types of ICF-S79V.
Please look at the mark of set shown below.
no mark: Original Typ
Liv: Liv Type
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
TV/WEATHER/FM/AM SYNTHESIZED RADIO
9-925-738-12Sony Corporation
2002B0500-1Personal Audio Company
C 2002.02Published by Sony Engineering Corporation
FM/MW/LW SYNTHESIZED RADIO
ICF-S79V
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 × 25)
1
battery case li
5
BATT lead (white)
– 4 –
SECTION 3
FM antenna
ground
(JW17)
L8
FM FREQUENCY
COVERAGE
L9
AM (MW)
FREQUENCY
COVERAGE
L5CT3
AM (MW)
TRACKING
TV TRACKING
(ICF-S79V only)
T1
TV IF
(ICF-S79V only)
L2
TV FREQUENCY
COVERAGE
(ICF-S79V only)
CT5
LW FREQUENCY
COVERAGE
(ICF-S79L only)
TV antenna
ground
(JW20)
FM/TV
antenna input
(JW18)
CT1
L1
T2
AM IF
FM
TRACKING
L6
CT4
CT2L5
LW TRA CKING
(ICF-S79L only)
MWLWL5
IC1
IC2
TP
(VT)
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.
L887.5 MHz (TV 2 ch)
Confirm108.0 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.
L687.5 MHz (TV 2 ch (59.75 MHz))
CT4108.0 MHz
( ): ICF-S79V
ICF-S79L only
LW FREQUENCY COVERAGE ADJUSTMENT
Adjust for a reading on digital voltmeter.
CT5153 kHz2.3 ± 0.1 V
Confirm279 kHz8.5 ± 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
CT2243 kHz
Adjustment and Connection Location:
[MAIN BOARD] (Component Side)
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.
L2WEATHER 2 ch1.0 ± 0.1 V
ConfirmTV 13 ch10 ± 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.
L1WEATHER 2 ch (162.40 MHz)
CT1TV 13 ch (215.75 MHz)
ICF-S79V only
Adjust for a maximum reading on level meter.
TV IF ADJUSTMENT
T110.7 MHz
AM (MW) FREQUENCY COVERAGE ADJUSTMENT
Adjust for a reading on digital voltmeter.
L9531 kHz (530 kHz)2.8 ± 0.1 V
Confirm1,602 kHz (1,710 kHz)9.5 ± 0.5 V
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>621 kHz (590 kHz)
CT31,395 kHz (1,490 kHz)
AM IF ADJUSTMENT
Adjust for a maximum reading on level meter.
T2455 kHz
( ): ICF-S79V
< >: ICF-S79L
( ): ICF-S79V
[MAIN BOARD] (Conductor Side)
– 5 –
– 6 –
ICF-S79/S79L/S79V
4-1. PRINTED WIRING BOARDS
SECTION 4
DIAGRAMS
HOW TO CHANGE THE CERAMIC FILTERS
This model is used two ceramic filters of CF1, CF3.
Y ou must use same type of color marked cer amic filters in order to
meet same specifications.
Therefore, the ceramic filter must change two pieces together since
it's supply two pieces in one package as a spare parts.
4-2. SCHEMATIC DIAGRAM (ICF-S79/S79L) • See page 11 for Waveforms and IC Block Diagrams.
ICF-S79/S79L/S79V
Note on Schematic Diagram:
• All capacitors are in µF unless otherwise noted. pF: µµF
50 WV or less are not indicated except for electrolytics
and tantalums.
• All resistors are in Ω and 1/
specified.
•¢ : internal component.
•: panel designation.
•
B+: B+ Line.
•: adjustment for repair.
• Power voltage is dc 4.5 V and fed with regulated dc power
supply from battery terminal.
• Voltages and waveforms are dc with respect to ground
under no-signal (detuned) conditions.
no mark : FM (TV 2 – 6 ch)
() : AM (MW)
[]: LW
W or less unless otherwise
4
• Voltages are taken with a V OM (Input impedance 10 MΩ).
V oltage variations may be noted due to normal production
tolerances.
• Waveforms are taken with a oscilloscope.
V oltage variations may be noted due to normal production
tolerances.
• Circled numbers refer to waveforms.
• Signal path.
: FM
: AM (MW/LW)
– 9 –
– 10 –
ICF-S79/S79L/S79V
4-3. SCHEMATIC DIAGRAM (ICF-S79V) • See page 11 for Waveforms and IC Block Diagrams.
Note on Schematic Diagram:
• All capacitors are in µF unless otherwise noted. pF: µµF 50
WV or less are not indicated except for electrolytics and
tantalums.
• All resistors are in Ω and 1/
specified.
•¢: internal component.
•: panel designation.
•: B+ Line.
•: adjustment f or repair.
• Power voltage is dc 4.5 V and fed with regulated dc power
supply from battery terminal.
• Voltages and wavef orms are dc with respect to ground under no-signal (detuned) conditions.
no mark : FM (TV 2 – 6 ch)
() : AM
<< >> : TV (7 – 13 ch)
W or less unless otherwise
4
• Voltages are taken with a VOM (Input impedance 10 MΩ).
V oltage variations may be noted due to normal production
tolerances.
• Waveforms are taken with a oscilloscope.
V oltage variations may be noted due to normal production
tolerances.
• Circled numbers refer to waveforms.
• Signal path.
: FM
: AM
: TV
– 11 –
– 12 –
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