Sony pmc md 55 service manual
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Extracted text from sony pmc md 55 service manual (Ocr-read)
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Ð 2 Ð 1. SERVICING NOTES .............................................. 3 2. GENERAL Playing a CD .................................................................. 6 Recording a Whole CD .................................................. 6 Playing an MD ............................................................... 7 Listening to the radio ..................................................... 7 Setting the Clock ............................................................ 8 Hooking up the System .................................................. 8 3. DISASSEMBLY ........................................................ 9 4. TEST MODE ............................................................. 15 5. ELECTRICAL ADJUSTMENTS Tuner Section ................................................................. 19 MD Section .................................................................... 21 CD Section ..................................................................... 28 Display Section .............................................................. 30 6. DIAGRAMS 6-1. Block Diagram Ð TUNER Section Ð ............................ 31 6-2 Block Diagram Ð MD Section Ð ................................... 34 6-3. Block Diagram Ð CD Section Ð .................................... 37 6-4. Block Diagram Ð FUNCTION SELECT/PANEL Section Ð ................... 40 6-5. Block Diagram Ð POWER AMP/POWER SUPPLY Section Ð .............. 43 6-6. Block Diagram Ð SUPER WOOFER Section Ð ........... 45 6-7. Printed Wiring Board Ð TUNER Section Ð .................. 49 6-8. Schematic Diagram Ð TUNER Section Ð ..................... 51 6-9. Schematic Diagram Ð BD Section Ð ............................. 53 6-10. Printed Wiring Boards Ð BD Section Ð ........................ 57 6-11. Printed Wiring Board Ð DG Section Ð .......................... 59 6-12. Schematic Diagram Ð DG Section Ð ............................. 61 6-13. Printed Wiring Boards Ð MAIN Section Ð ................... 64 6-14. Schematic Diagram Ð MAIN (CD) Section Ð .............. 67 6-15. Schematic Diagram Ð MAIN (SYSTEM CONTROL) Section Ð .................. 70 6-16. Schematic Diagram Ð MAIN (FUNCTION SELECT) Section Ð .................. 73 6-17. Printed Wiring Board Ð AUDIO/JACK Section Ð ........ 75 6-18. Schematic Diagram Ð AUDIO/JACK Section Ð .......... 77 6-19. Schematic Diagram Ð CD MOTOR Section Ð ............. 79 6-20. Printed Wiring Board Ð CD MOTOR Section Ð .......... 81 6-21. Printed Wiring Board Ð CD OPEN/CLOSE Section Ð ...................................... 82 6-22. Schematic Diagram Ð CD OPEN/CLOSE Section Ð ... 83 6-23. Printed Wiring Boards Ð PANEL Section Ð ................. 86 6-24. Schematic Diagram Ð PANEL Section Ð ...................... 89 6-25. Printed Wiring Boards Ð POWER AMP/POWER Section Ð .............................. 91 6-26. Schematic Diagram Ð POWER AMP/POWER Section Ð .............................. 93 6-27. Printed Wiring Boards Ð SUPER WOOFER Section Ð ...................................... 95 6-28. Schematic Diagram Ð SUPER WOOFER Section Ð ...................................... 97 6-29. IC Pin Function Description .......................................... 108 7. EXPLODED VIEWS ............................................... 118 8. ELECTRICAL PARTS LIST .............................. 128 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 Maximum power output 7 W+7 W ATTENTION AU COMPOSANT AYANT RAPPORT Ë LA SƒCURITƒ! LES COMPOSANTS IDENTIFIƒS PAR UNE MARQUE 0 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. 230 V AC, 50 Hz (AEP, UK)(US, Canadian) (MW/LW)
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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 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 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 CHUCK PLATE JIG ON REPAIRING On repairing CD section, playing a disc without the CD lid, use Chuck Plate Jig. ¥ Code number of Chuck Plate Jig: X-4918-255-1 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 chip component replacement ¥ Never reuse a disconnected chip component. ¥ Notice that the minus side of a tantalum capacitor may be dam- aged by heat. Flexible Circuit Board Repairing ¥ Keep the temperature of the soldering iron around 270 ûC dur- ing repairing. ¥ Do not touch the soldering iron on the same conductor of the circuit board (within 3 times). ¥ Be careful not to apply force on the conductor when soldering or unsoldering. NOTES ON HANDLING THE OPTICAL PICK-UP BLOCK OR BASE UNITCAUTION Use of controls or adjustments or performance of procedures other than those specified herein may result in hazardous ra- diation exposure. This appliance is classified as a CLASS 1 LASER product. The CLASS 1 LASER PRODUCT MARKING is located on the rear exterior. Laser component in this product is capable of emitting radiation exceeding the limit for Class 1. The following caution label is located inside the unit.