Sony mhc grx 9900 service manual
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Extracted text from sony mhc grx 9900 service manual (Ocr-read)
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Ð 3 Ð 1. SERVICING NOTES ............................................... 3 2. GENERAL Location of Controls ....................................................... 6 Setting the Time .............................................................. 7 3. DISASSEMBLY ......................................................... 8 4. TEST MODE .............................................................. 11 5. MECHANICAL ADJUSTMENTS ....................... 14 6. ELECTRICAL ADJUSTMENTS DECK Section ................................................................. 14 CD Section ...................................................................... 17 7. DIAGRAMS 7-1. Block Diagram Ð CD SERVO Section Ð ........................ 19 7-2. Block Diagram Ð TAPE DECK Section Ð ...................... 21 7-3. Block Diagram Ð MAIN Section Ð ................................. 23 7-4. Block Diagram Ð DISPLAY/KEY CONTROL/ POWER SUPPLY Section Ð ........................................... 25 7-5. Note for Printed Wiring Boards and Schematic Diagrams ....................................................... 27 7-6. Printed Wiring Board Ð BD Board Ð .............................. 29 7-7. Schematic Diagram Ð BD Board Ð ................................ 31 7-8. Printed Wiring Boards Ð CD MOTOR Section Ð .......... 33 7-9. Schematic Diagram Ð CD MOTOR Section Ð .............. 35 7-10. Printed Wiring Board Ð AUDIO Board Ð ...................... 37 7-11. Schematic Diagram Ð AUDIO Board Ð ......................... 39 7-12. Printed Wiring Board Ð LEAF SW Board Ð .................. 41 7-13. Schematic Diagram Ð LEAF SW Board Ð ..................... 41 7-14. Printed Wiring Board Ð MAIN Board Ð ........................ 43 7-15. Schematic Diagram Ð MAIN Board (1/4) Ð .................. 45 7-16. Schematic Diagram Ð MAIN Board (2/4) Ð .................. 47 7-17. Schematic Diagram Ð MAIN Board (3/4) Ð .................. 49 7-18. Schematic Diagram Ð MAIN Board (4/4) Ð .................. 51 7-19. Printed Wiring Board Ð PANEL/CD SW Board Ð ........ 53 7-20. Schematic Diagram Ð PANEL (1/3)/CD SW Board Ð ..................................... 55 7-21. Schematic Diagram Ð PANEL (2/3) Board Ð ................ 57 7-22. Schematic Diagram Ð PANEL (3/3) Board Ð ................ 59 7-23. Printed Wiring Board Ð TRANS Board Ð ....................... 61 7-24. Schematic Diagram Ð TRANS Board Ð ......................... 62 7-25. Printed Wiring Board Ð SUB TRANS Board (RXD9) Ð .................................... 63 7-26. Schematic Diagram Ð SUB TRANS Board (RXD9) Ð .................................... 64 7-27. IC Pin Function Description ........................................... 69 8. EXPLODED VIEWS ................................................ 74 9. ELECTRICAL PARTS LIST ............................... 83 TABLE OF CONTENTS SECTION 1 SERVICING NOTES 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 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)