Sony cfs w 320 service manual

Page 2

CFS-W320

TABLE OF CONTENTS SAFETY CH ECK-OUT
After correcting the original service problem,
m M Pig: perform the following safety check before releasing
the set to the customer:
Specifications """""""""""""""""""""""""""""""""""""""""""""""" 1 Check the antenna terminals, metal trim, metallized
knobs, screws, and all other exposed metal parts for
1 GENE_RAL AC leakage Check leakage as described below.
Location and Function of Controls ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 3

Tape Playback (either deck)
Listening to the Radio .........
Recording (deck B only) .................
Tape Dubbing (deck A to deck B)
Dial Pointer instllation ~~~~~~~~~~~~~~~~~~~

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

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2. ADJUSTMENTS .......................................................... 6
current can be measured by any one of three
3. DIAGRAMS meth°ds'
371. Semiconductor Lead Layouts ----------- ------------- 9 l. A commercial leakage tester, such as the
8-2. Printed Wiring Boards '10 Simpson 229 or RCA WT-540A. Follow the
33. Schematic Diagram--~ ~ 13 manufacturers instructions to use these instru-
ments.
4' EXPLODED VIEWS. .. 17 Z A battery-operated AC milliammeter. The Data
Precision 245 digital multimeter is suitable for
5. ELECTRICAL PARTS LIST~~ -20

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 075 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

SAFETY-RELATED COMPONENT WARNINGH suitablel (See Fig. A)

COMPONENTS IDENTIFIED BY MARK A 0R DOTTED
LINE WITH MARK A ON THE SCHEMATIC DIAGRAMS

AND IN THE PARTS LIST ARE CRITIcAL To SAFE Ta Exposed Metal
OPERATION. REPLACE THESE COMPONENTS WITH Fame" 3,,

SONY PARTS WHOSE PART NUMBERS APPEAR As
SHOWN IN THIS MANUAL OR IN SUPPLEMENTS PUB-

LISHED BY SONY. .1

AC
ATTENTION AUCOMPQSANT AVANT RAPPORT 0.75M 1.5m / voltmeter
A LA SECURITE! (0-75Vl
LES COMPOSANTS IDENTIFIES PAR UNE MAROUE A '
suR LEs DIAGRAMMES SCHEMATIOUES ET LA LISTE
DES PIECES SONT CRITIQUES POUR LA SEcURITE

DE FONCTIONNEMENT. NE REMPLACER CES COM- '7' 55",, mound
POSANTS QUE PAR DES PIECES SONY DONT LES
NUMEROS 30" DONNES DANS CE MANUEL 0 Fig/1. Usingan AC voltmeter to check AC leakage.

DANS LES SUPPLEMENTS PUBLIES PAR SONY.