Sony sa wmsp 1 service manual
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2 SA-WMSP1 TABLE OF CONTENTS 1. GENERAL .......................................................................... 3 2. DIAGRAMS 2-1. Circuit Boards Location ........................................................ 3 2-2. Printed Wiring Board ............................................................ 4 2-3. Schematic Diagram ............................................................... 5 3. EXPLODED VIEW 3-1. Front Section ......................................................................... 6 3-2. Amp Section ......................................................................... 6 4. ELECTRICAL PARTS LIST ......................................... 7 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 IDENTIFÉS 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 PIÈSES SONY DONT LES NUMÉROS SONT DONNÉS DANS CE MANUEL OU DANS LES SUPPÉMENTS PUBLIÉS PAR SONY. 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 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) SAFETY CHECK-OUT (US model) Fig. A. Using an AC voltmeter to check AC leakage. 0.15µFTo Exposed Metal Parts on Set 1.5kΩAC voltmeter (0.75V) Earth Ground
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33 SA-WMSP1 SECTION 1 GENERAL - Location of controls – Top view (a part) – SECTION 2 DIAGRAMS 1POWER button 2POWER indicator 3LEVEL dialFor schematic diagrams. Note: - 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 Ω and 1/4 W or less unless otherwise specified. -C: panel designation. For printed wiring boards.Note: -X: parts extracted from the component side. -Y: parts extracted from the conductor side. -b: Pattern from the side which enables seeing. - : B+ Line. - : B– Line. - Voltages are dc with respect to ground under no-signal con- ditions. no mark : Power on ∗ : Impossible to measure - Voltages are taken with a VOM (Input impedance 10MΩ). Voltage variations may be noted due to normal preduction tolerances. - Signal path. K: AUDIO THIS NOTE IS COMMON FOR PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS. (In addition to this, the necessary note is printed in each block.) 2-1. Circuit Boards Location Note: The components identi- fied by mark 0 or dotted line with mark 0 are criti- cal for safety. Replace only with part number specified.Note: Les composants identifiés par une marque 0 sont critiques pour la sécurité. Ne les remplacer que par une piéce portant le numéro spécifié. - Abbreviation CND : Canadian model SP : Singapore model MX : Mexican model AUS : Australia model MAIN board POWER IC board LED board SWITCH board CONTROL board 1 2 3