Sony sa ve 835 ed service manual
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2 SA-VE835ED/WMS835/SS-MS835 TABLE OF CONTENTS 1. DIAGRAMS 1-1. Circuit Boards Location (SA-WMS835) ............................ 3 1-2. Printed Wiring Boards (SA-WMS835) –Audio Section– .................................................................. 4 1-3. Printed Wiring Boards (SA-WMS835) –Main Power Section– ........................................................ 5 1-4. Schematic Diagram (SA-WMS835) ................................... 6 2. EXPLODED VIEWS 2-1. Front Panel Section (SA-WMS835) .................................... 7 2-2. Rear Panel Section (SA-WMS835) ..................................... 8 2-3. Speaker Section (SS-MS835) .............................................. 9 3. ELECTRICAL PARTS LIST ........................................ 10 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 0.15µF 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)
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33 SA-VE835ED/WMS835/SS-MS835 1-1. CIRCUIT BOARDS LOCATION (SA-WMS835) SECTION 1 DIAGRAMS MAIN POWER boar d IC1 (power amplifier unit) AUTO POWER board CONTROL board INPUT board INPUT SELECT board LED board POWER SWITCH board 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. THIS NOTE IS COMMON FOR PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS. (In addition to this, the necessary note is printed in each block.) for 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 Ω and 1/4 W or less unless otherwise specified. - 2 : nonflammable resistor. - C : panel designation. - A : B+ Line. - B : B– Line. -V oltage is dc with respect to ground under no-signal (detuned) condition. -V oltages are taken with a VOM (Input impedance 10 M Ω). V oltage variations may be noted due to normal produc- tion tolerances. - Signal path. F : AUDIO - Abbreviation CND : Canadian model. SP : Singapore model. for printed wiring boards: - X : parts extracted from the component side. - : Pattern from the side which enables seeing. - Abbreviation CND : Canadian model. SP : Singapore model. MX : Mexican model. AR : Argentine model. KR : korean model. Caution: Pattern face side: Parts on the pattern face side seen from the (Side B) pattern face are indicated. Parts face side: Parts on the parts face side seen from the (Side A) parts face are indicated. B These are omitted. C Q Q E BCE Ver 1.1