Sony ta v 909 service manual
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- 3 - SAFETY-RELATED COMPONENT WARNING!! COMPONENTS IDENTIFIED BY MARK ! OR DOTTED LINE WITH MARK ! 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 PUBLISHED BY SONY. ATTENTION AU COMPOSANT AYANT RAPPORT À LA SÉCURITÉ! LES COMPOSANTS IDENTIFÉS PAR UNE MARQUE ! SUR LES DIAGRAMMES SCHÉMATIQUES ET LA LISTE DES PIÈCES SONT CRITIQUES POUR LA SÉCURITÉ DE FONCTIONNEMENT. NE REMPLACER CES COMPOSANTS QUE PAR DES PIÈSES SONY DONT LES NUMÉROS SONT DONNÉS DANS CE MANUEL OU DANS LES SUPPÉMENTS PUBLIÉS PAR SONY. TABLE OF CONTENTS SAFETY CHECK-OUT After correcting the original service problem, perform the following safety checks 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 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. 1. A commercial leakage tester, such as the Simpson 229 or RCA WT-540A. Follow the manufacturers instructions to use these instruments. 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 voltmeter. 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) Earth Ground AC voltmeter (0.75V) 1.5kΩ 0.15µ F Fig. A. Using an AC voltmeter to check AC leakage. To Exposed Metal Parts on Set 1. GENERAL ··················\ ··················\ ··················\ ················ 4 2. DIAGRAMS 2-1. Circuit Boards Location ··················\ ··················\ ················· 6 2-2. Block Diagram - Main Section - ··················\ ················· 7 2-3. Block Diagram - Video In/Out Section - ··················\ ··· 11 2-4. Block Diagram -Power Section - ··················\ ·············· 13 2-5. Schematic Diagram - Video Section - ··················\ ······· 16 2-6. Printed Wiring Board - Video Section - ··················\ ···· 19 2-7. Printed Wiring Board - Surround Section - ················· 22 2-8. Schematic Diagram - Surround Section - ··················\ · 25 2-9. Printed Wiring Board - Digital Section - ··················\ ·· 30 2-10. Schematic Diagram - Digital Section - ··················\ ····· 33 2-11. Schematic Diagram - AMP, Power Supply Section - ·· 38 2-12. Printed Wiring Board - AMP, Power Supply Section - ··················\ ················· 43 2-13. Schematic Diagram - Display Section - ··················\ ···· 48 2-14. Printed Wiring Board - Display Section - ··················\ · 53 2-15. IC BLOCK DIAGRAMS ··················\ ··················\ ············· 57 2-16. IC PIN FUNCTION ··················\ ··················\ ··················\ ··· 61 3. EXPLODED VIEWS 3-1. FRONT PANEL SECTION ··················\ ··················\ ·········· 72 3-2. BACK PANEL SECTION ··················\ ··················\ ············ 73 3-3. CHASSIS SECTION ··················\ ··················\ ··················\ ·· 74 4. ELECTRICAL PARTS LIST ··················\ ················· 75