DOWNLOAD Sony ICF-S79 / ICF-S79L / ICF-S79V Service Manual ↓ Size: 1.84 MB | Pages: 26 in PDF or view online for FREE

FM  FREQUENCY  COVERAGE  ADJUSTMENT

Adjust for a reading on digital voltmeter.

L8

87.5 MHz (TV 2 ch)

2.3 ± 0.1 V (1.0 ± 0.1 V)

Confirm

108.0 MHz

8.5 ± 0.5 V (12.5 ± 0.5 V)

 Not use the FM RF signal generator in this adjustment.

(     ): 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

 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

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

 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 –

– 6 –

Repeat the procedures in each adjustment several times, and the
frequency coverage and tracking adjustments should be finally done
by the trimmer capacitors.

Setting:
BAND switch: AM (MW) or LW

0dB=1 µV

Setting:
BAND switch: FM1 or TV

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

 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 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

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

0.01

µ

F

FM antenna

ground

(JW17)

L8

FM FREQUENCY

COVERAGE

L9

AM (MW)

FREQUENCY

COVERAGE

L5

CT3

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

CT2

L5

LW TRACKING

(ICF-S79L only)

MW

LW

L5

IC1

IC2

TP

(VT)

+
–

digital voltmeter

MAIN board

TP

(VT)

 (Component Side)

 (Conductor Side)

This model is used two ceramic filters of CF1, CF3.
You must use same type of color marked ceramic 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.

– 7 –

– 8 –

Mark

Center frequency

red

10.70 MHz

blue

10.67 MHz

orange

10.73 MHz

black

10.64 MHz

white

10.76 MHz

mark

CF1

CF3

D1

G-1

Q1

F-1

D2

F-1

Q2

E-4

D3

E-2

Q3

I-6

D4

E-4

Q4

G-7

D5

H-2

Q5

E-6

D6

H-7

Q6

B-7

D7

G-6

Q7

H-6

D8

F-7

Q9

E-5

D9

E-2

Q10

D-6

D10

B-2

Q11

C-2

D11

B-2

Q12

A-2

D12

C-7

Q13

D-7

D13

C-7

Q14

C-7

D14

H-7

Q15

D-2

Q16

D-1

IC1

F-2

Q17

A-3

IC2

E-7

IC3

C-7

IC4

C-6

IC5

C-6

IC6

B-5

Ref. No. Location

Ref. No. Location

•

: parts extracted from the component side.

•

: indicates side identified with part number.

•

¢

: internal component.

•

: Pattern from the side which enables seeing.

– 9 –

– 10 –

•

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

/

4 

W or less unless otherwise

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

•

•

Voltages are taken with a VOM (Input impedance 10 M

Ω

).

Voltage variations may be noted due to normal production
tolerances.

•

Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal production
tolerances.

•

Circled numbers refer to waveforms.

•

Signal path.

: FM
: AM (MW/LW)

•

– 11 –

– 12 –

•

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

/

4

 

W or less unless otherwise

specified.

•

¢

: internal component.

•

: panel designation.

•

: 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 un-
der no-signal (detuned) conditions.
no mark : FM (TV 2 – 6 ch)
(

) : AM

<<

>> : TV (7 – 13 ch)

•

Voltages are taken with a VOM (Input impedance 10 M

Ω

).

Voltage variations may be noted due to normal production
tolerances.

•

Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal production
tolerances.

•

Circled numbers refer to waveforms.

•

Signal path.

: FM
: AM
: TV