Sony sa wx 900 service manual

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sony sa wx 900 service manual

Extracted text from sony sa wx 900 service manual (Ocr-read)


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2 SA-WX900 Specifications ........................................................................... 1 1.GENERAL ...................................................................... 3 2. DIAGRAMS 2-1. Circuit Boards Location ............................................. 4 2-2. Schematic Diagram – Filter Section – ........................ 5 2-3. Printed Wiring Board – Filter Section – ..................... 6 2-4. Schematic Diagram – Power Section – ...................... 7 2-5. Printed Wiring Board – Power Section – .................... 8 3. EXPLODED VIEWS 3-1. Amp Section ............................................................... 9 3-2. Cabinet Section ......................................................... 10 4. ELECTRICAL PARTS LIST .................................... 11 TABLE OF CONTENTS SAFETY CHECK-OUT 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 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 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) Fig. A. Using an AC voltmeter to check AC leakage. 0.15µFTo Exposed Metal Parts on Set 1.5kΩAC voltmeter (0.75V) Earth Ground 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 PUB- LISHED 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.

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3 SA-WX900 SECTION 1 GENERAL This section is extracted from instruction manual. - Location of controls LEVEL PHASE CUT OFF FREQUENCY NORMPHASE MODE CUT OFF FREQUENCY LEVEL OFFPOWER SAVE BOOST REVERSE 200Hz 50Hz MAX MIN AUTO MUSIC MOVIEOFF 12 POWER SAVEBOOST MODE POWER POWER indicator ON/STANDBY POWER