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SA-WM40 SERVICE MANUAL Ver 1.2 2002.09 US Model Canadian Model AEP Model UK Model E Model Australian Model SPECIFICATIONS ACTIVE SUBWOOFER 9-929-065-12 2002I0500-1 C 2002.09 Sony Corporation Home Audio Company Published by Sony Engineering Corporation 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 lowvoltage 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 2 V AC range are suitable. (See Fig. A) To Exposed Metal Parts on Set MODEL IDENTIFICATION ­ Rear View ­ 0.15 µF 1.5 k AC voltmeter (0.75 V) with this indication : US, Canadian models without this indication : Except US, Canadian models Earth Ground Fig. A. Using an AC voltmeter to check AC leakage. 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 А LA SЙCURITЙ! LES COMPOSANTS IDENTIFIЙS PAR UNE MARQUE 0 SUR LES DIAGRAMMES SCHЙMATIQUES ET LA LISTE DES PIИCES SONT CRITIQUES POUR LA SЙCURITЙ DE FONCTIONNEMENT. NE REMPLACER CES COMPOSANTS QUE PAR DES PIИCES SONY DONT LES NUMЙROS SONT DONNЙS DANS CE MANUEL OU DANS LES SUPPLЙMENTS PUBLIЙS PAR SONY. 2 SECTION 1 GENERAL · Location of controls ­ Front View (a part) ­ SECTION 2 DIAGRAMS 2-1. NOTE FOR PRINTED WIRING BOARD AND SCHEMATIC DIAGRAM Note on Schematic Diagram: · All capacitors are in µF unless otherwise noted. pF: µµF 50 WV or less are not indicated except for electrolytics and tantalums. · All resistors are in and 1/4 W or less unless otherwise specified. · C : panel designation. Note: The components identified by mark 0 or dotted line with mark 0 are critical for safety. Replace only with part number specified. Note: Les composants identifiйs par une marque 0 sont critiques pour la sйcuritй. Ne les remplacer que par une piиce por t