Sony sava 29 service manual

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Ñ 2 Ñ TABLE OF CONTENTS 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 RAPPORTË LA SƒCURITƒ! LES COMPOSANTS IDENTIFƒS PAR UNE MARQUE ! SUR LES DIAGRAMMES SCHƒMATIQUES ET LA LISTE DES PIéCES SONT CRITIQUES POUR LA SƒCURITƒ DE FONCTIONNEMENT. NE REMPLACER CES COMPOSANTS QUE PAR DES PIéSES SONY DONT LES NUMƒROS SONT DONNƒS DANS CE MANUEL OU DANS LES SUPPƒMENTS PUBLIƒS PAR SONY. TEST MODE ááááááááááááááááááááááááááááááááááááááááááááááááááá\ ááááááááááááááááááá 3 1. GENERAL ááááááááááááááááááááááááááááááááááááááááááááááááááá\ ááááááááááááááááááááááá 4 2. DISASSEMBLY 2-1. Removal Amplifier Block ááááááááááááááááááááááááááááááááááááááááááááááááááá\ 5 3. DIAGRAMS 3-1. Circuit Boards Location ááááááááááááááááááááááááááááááááááááááááááááááááááá\ áá 6 3-2. Schematic Diagram ÑDolby Section Ñ ááááááááááááááááááááááááááá 7 3-3. Printed Wiring Board ÑDolby Section Ñ ááááááááááááááááááááááááá 9 3-4. Schematic Diagram ÑDisplay Section Ñ ááááááááááááááááááááááá 11 3-5. Printed Wiring Board ÑDisplay Section Ñ áááááááááááááááááááá 13 3-6. Schematic Diagram ÑPower Section Ñ ááááááááááááááááááááááááá 15 3-7. Printed Wiring Board ÑPower Section Ñ áááááááááááááááááááááá 17 3-8. Schematic Diagram ÑPower Transformer Section Ñ áááá 19 3-9. Printed Wiring Board ÑPower Transformer Section Ñ áá 21 3-10. Printed Wiring Board ÑMain Section Ñ áááááááááááááááááááááááá 23 3-11. Schematic DiagramÑMain Section (1/2) Ñ ááááááááááááááááááá 25 3-12. Schematic Diagram ÑMain Section (2/2) Ñ ááááááááááááááááá 27 3-13. IC Pin Function ááááááááááááááááááááááááááááááááááááááááááááááááááá\ ááááááááááááá 29 3-14. IC Block Diagrams ááááááááááááááááááááááááááááááááááááááááááááááááááá\ áááááááá 30 4. EXPLODED VIEWS 4-1. System (L) Assy ááááááááááááááááááááááááááááááááááááááááááááááááááá\ áááááááááááá 32 4-2. System (R) Assy ááááááááááááááááááááááááááááááááááááááááááááááááááá\ áááááááááááá 33 4-3. Amplifier Section ááááááááááááááááááááááááááááááááááááááááááááááááááá\ áááááááááá 34 4-4. Rear Speaker Section ááááááááááááááááááááááááááááááááááááááááááááááááááá\ ááááá 35 4-5. Center Speaker Section ááááááááááááááááááááááááááááááááááááááááááááááááááá\ á 36 5. ELECTRICAL PARTS LIST ááááááááááááááááááááááááááááááááááááááá 37 After correcting the original service problem, perform the following safety checks before releasing the set to the customer: Check the antenna terminals, metal trim, ÒmetallizedÓ 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 manufacturersÕ 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 ÒlimitÓ 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) SAFETY CHECK-OUT To Exposed Metal Parts on Set 0.15 µF 1.5k ½ AC voltmeter (0.75V) Earth Ground Fig. A. Using an AC voltmeter to check AC leakage.