Sony DPS-V77 service manual Table of Contents

TABLE OF CONTENTS

Section Title Page

1.GENERAL·····························································3

2.TEST MODE························································ 17

3. CLOCK CONSTRUCTION .... ·...... ·	·.. ·...... ··	...... 19
4. EXPLANATION OF IC TERMINALS		· 20

5.DIAGRAMS

5-1. Block Diagram················································· 24

5-2.	Printed Wiring Boards··········· ..	· .. · .. ·············· .. · ..	· 28
5-3.	Schematic Diagram (l/2)	·..	·33
5-4. Schematic Diagram (2/2)			38

6.EXPLODED VIEWS

6-1. Front Panel Section··········································· 48

6-2. Chassis Section················································ 49

7. ELECTRICAL PARTS LIST 50

CAUTION

Danger of explosion if battery is in.correctly re- placed. Replace only with the same or equivalent type recommended by the equipment manufacturer. Discard u,sed batteries according to manufacturer's instructions.

ADVARSEL!

Lithiumbatteri-Eksplosionsfare ved fejlagtig handtering.

Udskiftning rna kun ske med batteri

af samme fabrikat og type.

Lever det brugte batteri tilbage til leverand¢ren.

ADVARSEL

Eksplosjonsfare ved feilaktig skifte av batted. Benytt samme batteritype eller en tilsvarende type anbcfalt av apparatfabrikanten.

Brukle batterier kasseres i hen hold til fabrikantens

instruksjoner.

VARNING

Explosionsfara vid felaktigt batteribyte. Anva.nd samma batterityp eller en Iikva.rdig typ som rekommenderas av apparattillverkaren. Kassera anva.nt batteri enIigt ga.llande f6reskrifter.

VAROITUS

Paristo voi r:ijahUUi, jos se on virheellisesti asennettu. Vaihda paristo ainoastaan laitevalmistajan suosittelemaan tyyppiin. H:ivit:i k:iytetty paristo valmistajan ohjeiden mukaisesti.

SAFETY CHECK-OUT (US Model)

A fter 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 ;my 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 rnA (500 microampers). Leakage current can be measured by anyone of three methods.

I.A commercial leakage tester, such as the Simpson 229 or RCA WT-540A. 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 YOM or battery-operated AC volt-

meter. The "limit" indication is 0.75 Y, so analog meters must have an accurate low- voltage scale. The Simpson 250 and Sanwa SH-63Trd are examples of a passive YOM that is suitable. Nearly all battery operated digital multimeters that have a 2 Y AC range arc suitable. (See Fig. A)

To Exposed Metal

Parts on Set

AC

0.15pFvoltmeter

(0.75 V)

-=-Earth Ground

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

SAFETY-RELATED COMPONENT WARNING!!

COMPONENTS IDENTIFIED BY MARK ill. OR DOTTED LINE WITH MARK ill. 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 SECURITE!

LES COMPOSANTS IDENTIFIES PAR UNE MARQUE ill.

SUR LES DIAGRAMMES SCHEMATIQUES ET LA L1STE DES PIECES SONT CRITIQUE:S POUR LA SECURITE DE FONCTIONNEMENT. NE REMPLACER CES COM- POSANTS QUE PAR DES PIECES SONY DONT LES NUMEROS SONT DONNES DANS CE MANUEL OU DANS LES SUPPLEMENTS PUBLIES PAR SONY.

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