Sony mds dre 1 service manual
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Page 1
Ð 2 Ð ATTENTION AU COMPOSANT AYANT RAPPORT Ë LA SƒCURITƒ! LES COMPOSANTS IDENTIFIƒS PAR UNE MARQUE ! SUR LES DIAGRAMMES SCHƒMATIQUES ET LA LISTE DES PIéCES SONT CRITIQUES POUR LA SƒCURITƒ DE FONCTIONNEMENT. NE REMPLACER CES COM- POSANTS QUE PAR DES PIéCES SONY DONT LES NUMƒROS SONT DONNƒS DANS CE MANUEL OU DANS LES SUPPLƒMENTS PUBLIƒS PAR SONY. SAFETY-RELATED COMPONENT WARNING!! COMPONENTS IDENTIFIED BY MARK ! OR DOTTED LINE WITH MARK ! 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. TABLE OF CONTENTS 1. SERVICING NOTES ............................................... 3 2. GENERAL ................................................................... 7 3. DISASSEMBLY ......................................................... 9 4. TEST MODE .............................................................. 12 5. ELECTRICAL ADJUSTMENTS ......................... 15 6. DIAGRAMS 6-1. Block Diagram Ð SERVO Section Ð .............................. 21 6-2. Block Diagram Ð MAIN Section (1/2) Ð ....................... 23 6-3. Block Diagram Ð MAIN Section (2/2) Ð ....................... 25 6-4. Block Diagram Ð DISPLAY/KEY/POWER SUPPLY Section Ð ............. 27 6-5. Notes for Printed Wiring Board and Schematic Diagram .................................................. 30 6-6. Printed Wiring Board Ð BD Board (SIDE A) Ð ............. 31 6-7. Printed Wiring Board Ð BD Board (SIDE B) Ð ............. 33 6-8. Schematic Diagram Ð BD Section (1/2) Ð ..................... 35 6-9. Schematic Diagram Ð BD Section (2/2)Ð ...................... 37 6-10. Printed Wiring Boards Ð DETECTION SW Board, MOTOR Board Ð ............... 39 6-11. Schematic Diagram Ð DETECTION SW/MOTOR Section Ð ........................ 41 6-12. Printed Wiring Board Ð DIGITAL Board (SIDE A) Ð ... 43 6-13. Printed Wiring Board Ð DIGITAL Board (SIDE B) Ð ... 45 6-14. Schematic Diagram Ð DIGITAL Section (1/4) Ð .......... 47 6-15. Schematic Diagram Ð DIGITAL Section (2/4) Ð .......... 49 6-16. Schematic Diagram Ð DIGITAL Section (3/4) Ð .......... 51 6-17. Schematic Diagram Ð DIGITAL Section (4/4) Ð .......... 53 6-18. Printed Wiring Board Ð PANEL Section (1) Ð .............. 56 6-19. Schematic Diagram Ð PANEL Section (1) Ð ................. 57 6-20. Printed Wiring Boards Ð PANEL Section (2) Ð ............. 59 6-21. Schematic Diagram Ð PANEL Section (2) Ð ................. 61 6-22. Printed Wiring Boards Ð POWER Section Ð ................. 63 6-23. Schematic Diagram Ð POWER Section Ð ..................... 65 6-24. IC Pin Function Description ........................................... 77 7. EXPLODED VIEWS ................................................ 88 8. ELECTRICAL PARTS LIST ............................... 93
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Ð 3 Ð SECTION 1 SERVICING NOTES SAFETY CHECK-OUT After correcting the original service problem, perform the follow- ing safety check before releasing the set to the customer: Check the antenna terminals, metal trim, ÒmetallizedÓ 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 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 manufacturersÕ 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 ÒlimitÓ indica- tion is 0.75 V, so analog meters must have an accurate low- voltage scale. The Simpson 250 and Sanwa SH-63Trd are ex- amples of a passive VOM that is suitable. Nearly all battery operated digital multimeters that have a 2 V AC range are suit- able. (See Fig. A) Fig. A. Using an AC voltmeter to check AC leakage. 1.5 k W 0.15 µF AC voltmeter (0.75 V) To Exposed Metal Parts on Set Earth Ground MODEL IDENTIFICATION Ñ LOWER SIDE CABINET (BOTTOM VIEW) Ñ Part No. Front Side 4-210-100-1 ¹: AEP and UK models 4-210-100-2 ¹: US and Canadian models ADVARSEL Eksplosjonsfare ved feilaktig skifte av batteri. Benytt samme batteritype eller en tilsvarende type anbefalt av apparatfabrikanten. Brukte batterier kasseres i henhold til fabrikantens instruksjoner. VARNING Explosionsfara vid felaktigt batteribyte. AnvŠnd samma batterityp eller en likvŠrdig typ som rekommenderas av apparattillverkaren. Kassera anvŠnt batteri enligt gŠllande fšreskrifter. VAROITUS Paristo voi rŠjŠhtŠŠ, jos se on virheellisesti asennettu. Vaihda paristo ainoastaan laitevalmistajan suosittelemaan tyyppiin. HŠvitŠ kŠytetty paristo valmistajan ohjeiden mukaisesti.ADVARSEL! Lithiumbatteri-Eksplosionsfare ved fejlagtig hŒndtering. Udskiftning mŒ kun ske med batteri af samme fabrikat og type. LevŽr det brugte batteri tilbage til leverand¿ren. CAUTION Danger of explosion if battery is incorrectly replaced. Replace only with the same or equivalent type recommended by the manufacturer. Discard used batteries according to the manufacturerÕs instruc- tions. The laser diode in the optical pick-up block may suffer electro- static break-down because of the potential difference generated by the charged electrostatic load, etc. on clothing and the human body. During repair, pay attention to electrostatic break-down and also use the procedure in the printed matter which is included in the repair parts. The flexible board is easily damaged and should be handled with care. NOTES ON LASER DIODE EMISSION CHECK The laser beam on this model is concentrated so as to be focused on the disc reflective surface by the objective lens in the optical pick-up block. Therefore, when checking the laser diode emis- sion, observe from more than 30 cm away from the objective lens.NOTES ON HANDLING THE OPTICAL PICK-UP BLOCK OR BASE UNIT