Sony icf cs 750 service manual

Page 1

SERVICE MANUAL

US Model
Canadian Model
AEP Mode/

Frequency range

Antennas

Speakers
Power outputs

Input

Output

SPEGFEAHONS

(US, CND model)

FM: 87.6-108MH2

AM: 530-l,710kHz

(AEP, WG model)

FM: 87.6-107.5MHz

AM: 531-1,602kHz

(IT model)

FM: 87.5-108MHz

AM: 526.5-1,606.5KHZ
Intermediate Frequency (IT model)
FM: 10.7MHz

AM: 455kHz

FM: AC cord antenna

AM: Built-in ferrite bar antenna
Full-range 7.7cm (3Va inches) dia.
500mW+500mW (at 10% harmonic dis-
tortion)

LINE IN jack (stereo minijack) input
impedance 47kt)

Headphones jack (stereo minijack)
30mW 160

Power requirements

Battery life

Dimensions

Weig ht

US. CND model: 120V AC, 60Hz
AEP, WG, IT model: 220V AC, 50Hz
For the power backup function: 9V
DC, one 6F22 battery

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

Approx 280x108X 131 mm (w/h/d)
(11/3X4/5><5/ inches)

incl. projecting parts and controls
Approx 1.15kg (2 In 9 oz) not incl:
battery

Design and specifications subject to change without notice

FEATURES

- You can enjoy the stereo sound.

0 Fail-sate headphone jack: The alarm is heard through
the speakers when headphones are connected.

- LINE IN jack allows you to listen to the stereo sound

US, CND model

AEP, WG, IT model,

from a Walkman. Discman, etc through the speakers.
- Dual alarrn AMIFM radio combined with an electric

12Ahours system

24-hour system

digital alarm clock and sleep timer.

AM 12:00=midnig ht
PM 12:00=noon

0:00=midnight
12:0 = noon

0 Choice of awakening to radio alarm. buzzer alarm. or
dual alarm: Alarm A (radio) and B (buzzer).
' DREAM BAR SNOOZE/SLEEP 0FF(US, CND

ICND: Canadian model
IWG : West Germany model
CIT : Itarian model

model), REPEAT ALARM/SLEEP OFF (AEP, WG, IT
model), operable with a.feather-light touch, offers
functions; snooze alarm and sleep timer turn off.

AM/FM STEREII DIGITAL CHICK RADIO
S ONY;

Page 2

ICF-CS750

SAFETY CH ECK-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 2V AC range are
suitable. (See Fig. A)

To Exposed Metal
Paris on Set

A C
voltmeter
10.75 VI

0.15mE ll: gum /

13 Earth Ground

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

MODEL IDENTIFICATION
-Specification Label-
Carved on rear cabinet

SONYo MODEL N0. ICF-CS750
-_
FM/AM ZBANDS

W/ll/lll/l/i/l/ll/l/Id

US, CND model : AC: 120V 60Hz 7W
AEP, WG, IT model: AC: 220V~50Hz 9W

OCND: Canadian model
OWG 2 West Germany model
CIT : ltarian model

SAFETY-RE LATED COMPONENT WARNING! !

COMPONENTS IDENTIFIED BY MARK A 0R 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.

ATTENTION AU COMPOSANT AYANT RAPPORT
A LA sécumTEi

LES COMPOSANTS IDENTIFIES PAR UNE MAROUE A
sun LEs DIAGRAMMES SCHEMATIQUES ET LA LISTE
DES PIEcEs SONT cmTIouEs POUR LA SECURITE
DE FONCTIONNEMENT. NE REMPLACER ces com-
POSANTS QUE PAR DES PIECES SONY DONT LEs
NUMénos SONT DONNEs DANS c: MANUEL ou
DANS LES SUPPLEMENTS PUBLIEs PAR SONY.