Sony sa ve 312 service manual
This is the 12 pages manual for sony sa ve 312 service manual.
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Extracted text from sony sa ve 312 service manual (Ocr-read)
Page 1
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 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 To Exposed Metal Parts on Set 0.15 µF 1.5 kΩAC Voltmeter (0.75 V) Earth Ground Fig. A. Using an AC voltmeter to check AC leakage.
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3 3 SECTION 1 DIAGRAMS 1-1. NOTE FOR PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS Note on Printed Wiring Board: -X: parts extracted from the component side. -b: Pattern from the side which enables seeing. -Indication of transistor. B These are omitted. CE Q 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 Ω and 1/4 W or less unless otherwise specified. -2: nonflammable resistor. -C: panel designation. -U: B+ Line. -V: B– Line. -Voltages are dc with respect to ground under no-signal conditions. no mark : AUDIO -Voltages are taken with a VOM (input impedance 10 MΩ). Voltage variations may be noted due to normal produc- tion tolerances. -Abbreviation CND : Canadian model -Circuit Boards Location SA-WMS315-IC Block Diagrams IC302 uPC1237H IC301 STK350-230 1 2 3 4 5 6 7 8 OVER LOAD DET F/F OFFSET DET LATCH/ AUTORESETV CC ON MUTE AC OFF DET V CC 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. POWER board POWER SWITCH board LED board CONTROL boardMAIN boar d 1 2 3 4 5 6 7 8 9 TR3 R1 R2 TR4 TR6 TR7 R4 R9TR5 TR1 TR2 R6 D4 D3 R7 R8 TR8 D1 D2 R5R3 INPUT NF -VEOUT +VEOUT V SS GND V CC SUB