Sony icf c 770 service manual

Page 1

IBF-l3770_

SERVICE MANUAL

PHOTO: BLACK

US Model
Canadian Model
AEP Model

SPECIFICATIONS
Frequency range
Band

FM 876-108MH2
US' CND My AM 530-1710kHz
n, mode! FM 87.5-108MHz

AM 526r5-1606,5kHz

FM 816-1075an
AEC' G "m' AM 531*1602kHz

Intermediate frequency range

Antennas

Spea ker
Power output
Power requirements

FM: 10,7MHz, AM: 455kHz

FM: FM wire antenna

AM: Built-in ferite bar antenna
Approx. 6.6 cm (2% inches) dial
180mw (at 10% harmonic distortion)

US, CND model

120V AC, 60Hz

AEC. G, lT model

220- 230V AC, 50Hz

Battery life

Dimensions

Weight

For the power backup function: 9V DC,
one 6F22 battery

Approx. 80 hours, using Sony battery
S-OO6P (U)

Approx 167X117X205mm (w/h/d)
(6/.X4/.X8'/.inches)

incl. projecting parts and controls
Approx, 750g (1 b. 65 oz.)

not incl, battery

Design and specifications subject to change without notice

Note

This appliance conforms with EEC Directive 87/308/EEC regarding inter-

ference suppression.

US. CND model

AEC, G, lT modelt

12hours system

24-hour system

AM 12: 00=midnight
PM 12: 00=noon

O: 00=midnight
12: 00=noon

Featu res

a Dual alarm digital clock radio

OChoice of radio or buzzer awakening sound for each of the two alarm,

0 Easy-to-read swing display panel,
You can adjust the angle of the display panel as you like

OSnooze alarm that can be operated with a feather-light touch.

0 Power back-up function using a 6F22 battery (not supplied) to keep the
clock operating during a power interruption.

0 Wall mountable.

DCND
IAEC
0G
0 lT

: Canadian model

: North European model
: Germany model

: Italian model

FM/AM DIGITAL CLOCK RADIO

SONXC

Page 2

ICF-C770

SAFETY CHECK-OUT (US Model) MODEL IDENTIFICATION
-Specification Label-

After correcting the original service problem,

perform the followmg safety check before releasing SONYIA MODEL No. ICF-C770
the set to the customer:
Check the antenna terminals, metal trim, metallized FM/AM 2 BANDS

knobs, screws, and all other exposed metal parts for WW

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

Vus CND model: AC: 120v 60Hz 5w

not exceed 0.5 mA (500 microampers). Leakage AEC, G, IT model: AC: 220-230V~50Hz 5w
current can be measured by any one of three
methods. OCND : Canadian model
OAEC : North European model

1. A commercial leakage tester, such as the .9 :Germany model

Simpson 229 or RCA WT-540A. Follow the , olT : Italian model

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 batteryoperated 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 2V AC range are
suitable. (see Fig. A) SAFETY-RELATED COMPONENT WARNING

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

To Exposed Metal
Parts on Set

fl

01,5. I gum / firm, ATTENTION AUCOMPO'SANT AYANT RAPPORT
ro.75w A LA SECURITE!
' LES COMPOSANTS IDENTIFIES PAR um: MARQUE A

sun LES DIAGRAMMES SCHEMATIQUES ET LA LISTE
DES PIECES SONT CRITIQUES POUR LA SECURITE

-_- 58",, mound DE FONCTIONNEMENT. NEREMPLACER ces COM-
POSAIITS QUE PAR DES PIECES SONY DONT LES
Fig. A. Usingan AC voltmeter to check AC leakage. NUMEROS SONT DONNES DANS CE MANUEL 0U

DANs LES SUPPLEMENTS PUBLIES PAR soNv.