Sony mce k 750 service manual
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Ñ 2 Ñ TABLE OF CONTENTS 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 PUBLISHED BY SONY. Notes on chip component replacement ¥ Never reuse a disconnected chip component. ¥ Notice that the minus side of a tantalum capacitor may be damaged by heat. This appliance is classified as a CLASS 1 LASER product. The CLASS 1 LASER PRODUCT MARKING is located on the rear exterior. This caution label is located inside the unit. The laser component in this product is capable of emitting radiation exceeding the limit for Class 1. CAUTION Use of controls or adjustments or performance of procedures other than those specified herein may result in hazardous radiation exposure. 1. SERVICING NOTEáááááááááááááááááááááááááááááááááááááááááááááááá 3 2. TEST MODE ááááááááááááááááááááááááááááááááááááááááááááááááááá\ ááááááááááááááá 4 3. GENERAL ááááááááááááááááááááááááááááááááááááááááááááááááááá\ ááááááááááááááááááá 6 4. DISASSEMBLY 4-1. CABINET ááááááááááááááááááááááááááááááááááááááááááááááááááá\ áááááááááááááááááááááááá 7 4-2. BASE UNIT (BU-5BD24) ááááááááááááááááááááááááááááááááááááááááááááááááá 7 5. ELECTRICAL ADJUSTMENTS ááááááááááááááááááááááááááááá 8 6. DIAGRAMS 6-1. CIRCUIT BOARDS LOCATION áááááááááááááááááááááááááááááááááááá 10 6-2. BLOCK DIAGRAM Ñ BD SECTION Ñ áááááááááááááááááááááá 11 6-3. BLOCK DIAGRAM Ñ MAIN SECTION Ñ ááááááááááááááááá 13 6-4. SCHEMATIC DIAGRAM Ñ BD SECTION Ñ ááááááááááááá 16 6-5. PRINTED WIRING BOARD Ñ BD SECTION Ñ áááááááá 19 6-6. PRINTED WIRING BOARD Ñ VIDEO SECTION Ñ ááááááááááááááááááááááááááááááááááááááááááááááááá 21 6-7. SCHEMATIC DIAGRAM Ñ VIDEO SECTION Ñ áááááááááááááááááááááááááááááááááááááááááááááááááá 23 6-8. SCHEMATIC DIAGRAM Ñ DIAPLAY SECTION Ñ ááááááááááááááááááááááááááááááááááááááááááááá 27 6-9. PRINTED WIRING BOARD Ñ DISPLAY SECTIONÑ ááááááááááááááááááááááááááááááááááááááááááááááá 31 6-10. PRINTED WIRING BOARD Ñ MAIN SECTIONÑ ááá 33 6-11. SCHEMATIC DIAGRAM Ñ MAIN SECTIONÑ ááááááááá 35 6-12. IC BLOCK DIAGRAMS ááááááááááááááááááááááááááááááááááááááááááááááááá 38 6-13. IC PIN FUNCTION ááááááááááááááááááááááááááááááááááááááááááááááááááá\ áááááá 41 7. EXPLODED VIEWS 7-1. CASE SECTION ááááááááááááááááááááááááááááááááááááááááááááááááááá\ ááááááááááá 45 7-2. CHASSIS SECTION ááááááááááááááááááááááááááááááááááááááááááááááááááá\ ááááá 46 7-3. MECHANISM DECK SECTION (CDM14M-5BD24) ááá 47 7-4. BASE UNIT SECTION (BU-5BD24) ááááááááááááááááááááááááááááá 48 8. ELECRICAL PARTS LIST áááááááááááááááááááááááááááááááááááááá 49
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Ñ 3 Ñ SECTION 1 SERVICING NOTE SELF-DIAGNOSIS This model has the self-diagnosis function for the video and audio decoder sections. Immediately after the power on, the self-diagnosis function searches each operation of ICÕs around the mechanism control microcomputer (IC504). The LED (D502) on the VIDEO board indicates their results. [VIDEO BOARD] Ñ SIDE A ÑHOW TO OPEN THE DISC TRAY WHEN POWER SWITCH TURNS OFF Insert a screwdriver into the aperture of the unit bottom, and turn in the direction of arrow (to OUT direction). *To close the disc table, turn the screwdriver in the reverse direction (to IN direction). NOTES ON HANDLING THE OPTICAL PICK-UP BLOCK OR BASE UNIT The laser diode in the optical pick-up block may suffer electrostatic 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 emission, observe from more than 30 cm away from the objective lens. LASER DIODE AND FOCUS SEARCH OPERATION CHECK Carry out the ÒS curve checkÓ in ÒCD section adjustmentÓ and check that the S curve waveform is output three times. LED (D101) INDICATION Light 1 Time blinking (Repeatedly) 2 Time blinking (Repeatedly) SYMPTOM No error Video decoder error (IC503) Video RAM error (IC502) Screwdriver IN OUT Pull out disc table. IC503 IC502IC504 D502 SL501SL503 SL502