Sony st s 101 service manual

Page 2

ST-S1 01

MODEL IDENTIFICATION
-BACK PANEL (TOP LEFT CORNER) '-

SONYA MODEL N0. ST-s101

FM STEREO/FMAM TUNER

7///////////////////////M

SERIAL No.
MADE IN JAPAN

Canadian model : A0120V~60Hz 8W
AEP model : A0220V~50/60Hz

To change the AM tuning interval (Canadian model)

The AM tuning interval is preset at the factory to 10 kHz or to

9 kHz to match the frequency allocation system of your

country. To change the interval. proceed as follows.

1 Depress the POWER switch to turn on the system.

2 Set the BAND selector to AM.

3 Press the POWER switch again to turn off the unit.

4 Hold the TUNING knob in the + positi'pn, and depress
the POWER switch to turn on the unit. '

To reset the interval. follow the same procedure.

Note

When the interval is changed, all stored stations will be
erased,

After changing the interval, be sure to store the stations
again.

SAFETY-RELATED COMPONENT WARNINGII

COMPONENTS IDENTIFIED EV 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 SONV.

ATTENTION AU COMPQSANT AYANT RAPPORT
A LA SECURITE!

LES COMPOSANTS IDENTIFIES PAR UNE MAROUE A
sun LES DIAGRAMMES SCHEMATIQUES ET LA LISTE
DES PIECES somr cmTiouEs POUR LA sécumré
DE FONCTIONNEMENT. NE REMPLACER ces com.
POSANTS oue PAR DES PIECES SONV DONT LES
NUMEROS som DONNES DANS cs MANUEL ou
DANS LES SUPPLEMENTS PUBLIES PAR soNV.

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-S40A. Follow the
manufacturers instructions to use these instru-

ments.

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

Measuring the voltage drop across a resistor by
means of a VOM or battery-operated AC volt-
meter. The Iimit indication is 0.75V, 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
Part: on Set

A C
voltmeter

0. 7 5 MF
(0. 75 V)

fgifikfl
L.

Earth Ground

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