Sony icf 780 service manual

Page 1

IF-780

SERVICE MANUAL

Photo :AEP (WHITE) model

US Model
Canadian Model
AEP Model

Frequency range

Intermediate frequency
Antennas

Speaker

Power output
Output

Power requirements

Battery lite
Dimensions

Weight
Supplied accessory

SPECIFICATIONS

FM :87.5 - 108 MHz (Italian model)

87.6 - 107.5 MHZ (AEP model)

87.6 - 108 MHz (US, Canadian model)
AM : 526.5 - 1606,5kHz (Italian model)

581 ~ 1602 kHz (AEP model)

530 - 1710 kHz (US, Canadian model)
FM : 10.7 MHz
AM 1 455 kHz
FM/SW : Telescopic antenna
AM : Built-in territe bar antenna
Approx. 102 cm (4 1/8 inches) dia, 8 ohms
430mW (at 10% harmonic distortion)
Earphone jack (mlnljack)
With the supplied AC power cord : 220V AC, 50 Hz (AEP,Italian model)

: 120V AC, 60H2 (US,Canadian model)
With tour R6 (size AA) batteries : 6V DC
Approx. 35 hours using Sony batteries SUM-5 (NS)
Approx. 255 X 129 X 62.6 mm (wlh/d)
(101/8 >< 51/8 X 2 1/2 inches)

inclt projecting parts and controls with carrying handle pushed in
Approx. 965 g (2 lb 2 oz) incl. batteries
AC power cord (1)

Design and specrlioations subject to change without notice.

FM/AM 2 BAND RECEIVER
SONY;

Page 2

lCF-780 J

SAFETY CHECK-OUT

After correcting the original service problem,
perform the following safety check before releasing
the set to the customer:

Check the antenna terminals, metal trim, metallized
knobs, screws, and all other exposed metal parts for
AC leakage. Check leakage as described below.

LEAKAGE TEST

The AC leakage from any exposed metal part to
earth ground and from all exposed metal parts to any
exposed metal part having a return to chassis, must
not exceed 0.5 mA (500 microampers). Leakage
current can be measured by any one of three
methods.

I. A commercial leakage tester, such as the
Simpson 229 or RCA WT-54OA. Follow the
manufacturers instructions to use these instru-
ments,

2. A battery-operated AC milliammeter. The Data
Precision 245 digital multimeter is suitable for
this job.

3. Measuring the voltage drop across a resistor by
means of a VOM or battery-operated AC volt-
meter. The limit indication is 0.75 V, so
analog meters must have an accurate low-
voltage scale. The Simpson 250 and Sanwa
SH-63Trd are examples of a passive VOM that
is suitable. Nearly all battery operated digital
multimeters that have a 2 V AC range are
suitable. (See Fig. A)

To Exposed Metal
Part: on Set

0.15uF 'L-g 1.5m
L.

#-

A C
/ voltmeter
(0. 75 VI

55m Ground

Fig. A. Using an AC voltmeter to check AC leakage.

MODEL IDENTIFICATION
-Speciiication Label-

S O N Y®
FM/AM ZBANDS

MODEL NO. l0F-780

US, Canadian model : Ac : 120V 60Hz 4W
AEP. Italian model 1 AC 2 220V N 50H: 4W

SAFETY-R ELATED COMPONENT WARNING! !

COMPONENTS IDENTIFIED BY MARK A OR DOTTED
LINE WITH MARK A ON THE SCHEMATIC DIAGRAMS
AND IN THE PARTS LIST ARE CRITICALTO SAFE
OPERATION. REPLACE THESE COMPONENTS WITH
SONY PARTS WHOSE PART NUMBERS APPEAR AS
SHOWN IN THIS MANUAL OR IN SUPPLEMENTS PUB«
LISHED BY SONY.

ATTENTION AUCOMPO'SANT AYANT RAPPORT
A LA SECURITEI

LES COMPOSANTS IDENTIFIES PAR UNE MAROUE A
sun LES DIAGRAMMES SCHEMATIOUES er LA LISTE
DES PIECES sour CRITIQUES POUR LA sécumré
DE FONCTIONNEMENT. NE REMPLACER as com.
POSANTS QUE PAR DES PIECES souv DDNI' LES
NUMEROS sour DONNES DANS cs MANUEL ou
DANS LES SUPPLEMENTS PUBLIES PAR souv.