Sony sa wft 3 service manual
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2 SAFETY-RELATED COMPONENT WARNING!! COMPONENTS IDENTIFIED BY MARK 0 OR DOTTED LINE WITH MARK 0 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 IDENTIFIÉS PAR UNE MARQUE 0 SUR LES DIAGRAMMES SCHÉMATIQUES ET LA LISTE DES PIÈCES SONT CRITIQUES POUR LA SÉCURITÉ DE FONCTIONNEMENT. NE REMPLACER CES COMPOSANTS QUE PAR DES PIÈCES SONY DONT LES NUMÉROS SONT DONNÉS DANS CE MANUEL OU DANS LES SUPPLÉMENTS PUBLIÉS PAR SONY. To Exposed Metal Parts on Set 0.15 µF 1.5k Ω AC voltmeter (0.75V) Earth Ground Fig. A. Using an AC voltmeter to check AC leakage. SAFETY CHECK-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 microamperes). 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) SA-WFT3 (subwoofer)Speaker system Active subwoofer, magnetically shielded Speaker units Woofer: 15 cm (× 2), cone type Enclosure type Acoustically Loaded Bass reflex Reproduction frequency range 28 Hz – 200 Hz Continuous RMS power output 150 W (6 ohms 100 Hz, 10% THD) Input LINE IN (input pin jack) General Power requirements US, CND model: 120 V AC, 60 Hz AEP, UK model: 230 V AC, 50/60 Hz SP, MY model: 220 – 230 V AC, 50/60 Hz Power consumptions 80 W 0.3 W (standby mode) Dimensions (w/h/d) Approx. 182 × 477 × 353 mm Mass Approx. 12 kg Supplied accessories SA-FT3H: Speaker cord (3.5 m) (3) Speaker cord (10 m) (2) Table top stand cover (4) Table top stand base (4) Center speaker stand base (1) Center speaker stand adjuster (1) Cushion (20) Rear pad (10) Screw (M5) (5) Screw (M4) (2) Screw (M3.5) (16) SS-FRF3H:Speaker cord (10 m) (1) Table top stand base (1) Table top stand cover (1) Screw (M5) (1) Screw (M3.5) (4) Cushion (4) Rear pad (2) Design and specifications are subject to change without notice. -Abbreviation CND : Canadian model SP : Singapore model MY : Malaysia model SA-FT3H/WFT3/SS-CNF3H/FRF3H
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3 SA-FT3H/WFT3/SS-CNF3H/FRF3H TABLE OF CONTENTS 1. DISASSEMBLY 1-1. Rear Panel Section .............................................................. 4 1-2. Main Board, Power AMP Board ......................................... 5 2. DIAGRAMS 2-1. Block Diagram .................................................................... 7 2-2. Printed Wiring Boards – Main Section – ............................ 8 2-3. Printed Wiring Boards – Control Section – ......................... 9 2-4. Schematic Diagram – Main Section – ............................... 10 3. EXPLODED VIEWS 3-1. Front/Surround Speaker Section (SS-FRF3H) .................. 11 3-2. Center Speaker Section (SS-CNF3H) ............................... 12 3-3. Subwoofer Section (1) (SA-WFT3) .................................. 13 3-4. Subwoofer Section (2) (SA-WFT3) .................................. 14 4. ELECTRICAL PARTS LIST ......................................... 15