LG-DV286-cd-sm 电路图 维修手册.pdf

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1、DVD-VIDEO PLAYER SERVICE MANUAL MODELS : DVX286/DV286/DV286K CAUTION BEFORE SERVICING THE UNIT, READ THE “SAFETY PRECAUTIONS” IN THIS MANUAL. MODELS : DVX286/DV286/DV286KSERVICE MANUAL P/N : AFN31629357 JANUARY, 2007 RadioFans.CN 收音机爱 好者资料库 CONTENTS SECTION 1.SUMMARY SECTION 2.CABINET CONNECT A 1500

2、 OHM 10 WATT RESISTOR, PARALLELED BY A .15 MFD. 150.V A.C TYPE CAPACITOR BETWEEN A KNOWN GOOD EARTH GROUND (WATER PIPE, CONDUIT, ETC.) AND THE EXPOSED METALLIC PARTS, ONE ATATIME. MEASURE THE A.C. VOLTAGE ACROSS THE COMBINATION OF 1500 OHM RESISTOR AND .15 MFD CAPACITOR. REVERSE THE A.C. PLUG AND RE

3、PEAT A.C. VOLTAGE MEASUREMENTS FOR EACH EXPOSED METALLIC PART. VOLTAGE MEASURED MUSTNOTEXCEED 75 VOLTS R.M.S. THIS CORRESPONDS TO 0.5 MILLIAMP A.C ANY VALUE EXCEEDING THIS LIMIT CONSTITUTES A POTENTIAL SHOCK HAZARD AND MUST BE CORRECTED IMMEDIATELY. SUBJECT : GRAPHIC SYMBOLS THE LIGHTNING FLASH WITH

4、 APROWHEAD SYMBOL. WITHIN AN EQUILATERAL TRIANGLE, IS INTENDED TO ALERT THE SERVICE PERSONNELTO THE PRESENCE OF UNINSULATED “DANGEROUS VOLTAGE” THAT MAY BE OF SUFFICIENT MAGNITUDE TO CONSTITUTE ARISK OF ELECTRIC SHOCK. THE EXCLAMATION POINT WITHIN AN EQUILATERALTRIANGLE IS INTENDED TO ALERT THE SERV

5、ICE PERSONNEL TO THE PRESENCE OF IMPORTANT SAFETY INFORMATION IN SERVICE LITERATURE. SUBJECT : X-RADIATION 1.BE SURE PROCEDURES AND INSTRUCTIONS TO ALL SERVICE PERSONNEL COVER THE SUBJECT OF X-RADIATION. THE ONLY POTENTIALSOURCE OF X- RAYS IN CURRENT T.V. RECEIVERS IS THE PICTURE TUBE. HOWEVER, THIS

6、 TUBE DOES NOTEMITX-RAYS WHEN THE HIGH VOLTAGE IS ATTHE FACTORY SPECIFIED LEVEL. THE PROPER VALUE IS GIVEN IN THE APPLICABLE SCHEMATIC. OPERATION AT HIGHER VOLTAGES MAY CAUSE A FAILURE OF THE PICTURE TUBE OR HIGH VOLTAGE SUPPLY AND, UNDER CERTAIN CIRCUMSTANCES, MAY PRODUCE RADIATION IN EXCESS OF DES

7、IRABLE LEVELS. 2.ONLY FACTORY SPECIFIED C.R.T. ANODE CONNECTORS MUST BE USED. DEGAUSSING SHIELDS ALSO SERVE AS X-RAY SHIELD IN COLOR SETS, ALWAYS RE-INSTALLTHEM. 3.IT IS ESSNTIAL THAT SERVICE PERSONNEL HAVE AVAILABLE AN ACCURATE AND RELIABLE HIGH VOLTAGE METER. THE CALIBRATION OF THE METER SHOULD BE

8、 CHECKED PERIODICALLY AGAINST A REFERENCE STANDARD, SUCH AS THE ONE AVAILABLE ATYOUR DISTRIBUTOR. 4.WHEN THE HIGH VOLTAGE CIRCUITRYIS OPERATING PROPERLYTHERE IS NO POSSIBILITYOF AN X-RADIATION PROBLEM. EVERYTIME ACOLOR CHASSIS IS SERVICED. THE BRIGHTNESS SHOULD BE RUN UP AND DOWN WHILE MONITORING TH

9、E HIGH VOLTAGE WITH A METER TO BE CERTAIN THAT THE HIGH VOLTAGE DOES NOT EXCEED THE SPECIFIED VALUE AND THAT IT IS REGULATING CORRECTLY, WE SUGGEST THAT YOU AND YOUR SERVICE ORGANIZATION REVIEW TESTPROCEDURES SO THATVOLTAGE REGULATION IS ALWAYS CHECKED AS ASTANDARD SERVICING PROCEDURE. AND THATTHE H

10、IGH VOLTAGE READING BE RECORDER ON EACH CUSTOMERS INVOICE. 5.WHEN TROUBLESHOOTING AND MAKING TEST MEASUREMENTS IN A PRODUCT WITH A PROBLEM OF EXCESSIVE HIGH VOLTAGE, AVOID BEING UNNECESSARILY CLOSE TO THE PICTURE TUBE AND THE HIGH VOLTAGE SUPPLY. DO NOT OPERATE THE PRODUCT LONGER THAN IS NECESSARY T

11、O LOCATE THE CAUSE OF EXCES SIVE VOLTAGE. 6.REFER TO HV. B+ AND SHUTDOWN ADJUSTMENT PROCEDURES DESCRIBED IN THE APPROPRIATE SCHEMATIC AND DIAGRAMS (WHERE USED). SUBJECT : IMPLOSION 1.ALL DIRECT VIEWED PICTURE TUBES ARE EQUIPPED WITH AN INTE GRAL IMPLOSION PROTECTION SYSTEM, BUT CARE SHOULD BE TAKEN

12、TO AVOID DAMAGE DURING INSTALLATION, AVOID SCRATCHING THE TUBE. IF SCRATCHED REPLACE IT. 2.USE ONLYRECOMMENDED FACTORYREPLACEMENTTUBES. SUBJECT : TIPS ON PROPER INSTALLATION 1.NEVER INSTALL ANY PRODUCT IN A CLOSED-IN RECESS, CUBBYHOLE OR CLOSELY FITTING SHELF SPACE. OVER OR CLOSE TO HEAT DUCT, OR IN

13、 THE PATH OF HEATED AIR FLOW. 2.AVOID CONDITIONS OF HIGH HUMIDITY SUCH AS: OUTDOOR PATIO INSTALLATIONS WHERE DEW IS AFACTOR, NEAR STEAM RADIATORS WHERE STEAM LEAKAGE IS AFACTOR, ETC. 3.AVOID PALCEMENTWHERE DRAPERIES MAYOBSTRUCTREAR VENTING. THE CUSTOMER SHOULD ALSO AVOID THE USE OF DECORATIVE SCARVE

14、S OR OTHER COVERINGS WHICH MIGHT OBSTRUCTVENTILATION. 4.WALL AND SHELF MOUNTED INSTALLATIONS USING A COMMERCIAL MOUNTING KIT. MUST FOLLOW THE FACTORY APPROVED MOUNTING INSTRUCTIONS A PRODUCT MOUNTED TO A SHELF OR PLATFORM MUST RETAIN ITS ORIGINALFEET(OR THE EQUIVALENTTHICKNESS IN SPACERS) TO PROVIDE

15、 ADEQUATE AIR FLOW ACROSS THE BOTTOM, BOLTS OR SCREWS USED FOR FASTENERS MUSTNOTTOUCH ANYPARTS OR WIRING. PERFORM LEAKAGE TESTON CUSTOMIZED INSTALLATIONS. 5.CAUTION CUSTOMERS AGAINSTTHE MOUNTING OF APRODUCTON SLOPING SHELF OR A TILTED POSITION, UNLESS THE PRODUCT IS PROPERLY SECURED. 6.APRODUCT ON A

16、ROLL-ABOUT CART SHOULD BE STABLE ON ITS MOUNTING TO THE CART. CAUTION THE CUSTOMER ON THE HAZARDS OF TRYING TO ROLL A CART WITH SMALL CASTERS ACROSS THRESHOLDS OR DEEP PILE CARPETS. 7.CAUTION CUSTOMERS AGAINST THE USE OF ACART OR STAND WHICH HAS NOT BEEN LISTED BY UNDERWRITERS LABORATORIES, INC. FOR

17、 USE WITH THEIR SPECIFIC MODEL OF TELEVISION RECEIVER OR GENERICALLY APPROVED FOR USE WITH T.V.S OF THE SAME OR LARGER SCREEN SIZE. 8.CAUTION CUSTOMERS AGAINST THE USE OF EXTENSION CORDS, EXPLAIN THAT A FOREST OF EXTENSIONS SPROUTING FROM A SINGLE OUTLET CAN LEAD TO DISASTROUS CONSEQUENCES TO HOME A

18、ND FAMILY. 1-4 SERVICING PRECAUTIONS CAUTION : Before servicing the DVD covered by this service data and its supplements and addends, read and follow the SAFETYPRECAUTIONS. NOTE: if unforeseen circumstances create conflict between the following servicing precautions and any of the safety precautions

19、 in this publications, always follow the safety precautions. Remembers Safety First: General Servicing Precautions 1.Always unplug the DVD AC power cord from the AC power source before: (1) Removing or reinstalling any component, circuit board, module, or any other assembly. (2) Disconnection or rec

20、onnecting any internal electrical plug or other electrical connection. (3) Connecting a test substitute in parallel with an electrolytic capacitor. Caution : A wrong part substitution or incorrect polarity installation of electrolytic capacitors may result in an explosion hazard. 2.Do not spray chem

21、icals on or near this DVD or any of its assemblies. 3.Unless specified otherwise in this service data, clean electrical contacts by applying an appropriate contact cleaning solution to the contacts with a pipe cleaner, cotton-tipped swab, or comparable soft applicator. Unless specified otherwise in

22、this service data, lubrication of contacts is not required. 4.Do not defeat any plug/socket B+ voltage interlocks with whitch instruments covered by this service manual might be equipped. 5.Do not apply AC power to this DVD and/or any of its electrical assemblies unless all solid-state device heat s

23、inks are cerrectly installed. 6.Always connect test instrument ground lead to the appropriate ground before connection the test instrument positive lead. Always remove the test instrument ground lead last. Insulation Checking Procedure Disconnect the attachment plug from the AC outlet and turn the p

24、ower on. Connect an insulation resistance meter(500V) to the blades of the attachment plug. The insulation resistance between each blade of the attachment plug and accessible conductive parts (Note 1) should be more than 1Mohm. Note 1 : Accessible Conductive Parts including Metal panels, Input termi

25、nals, Earphone jacks, etc. Electrostatically Sensitive (ES) Devices Some semiconductor (solid state) devices can be damaged easily by static electricity. Such components commonly are called Electrostatically Sensitive (ES) Devices. Examples of typical ES devices are integrated circuits and some fiel

26、d effect transistors and semiconductor chip components. The following techniques should be used to help reduce the incidence of component damage caused by static electricity. 1.Immediately before handling any semiconductor component or semiconductor-equipped assembly, drain off any electrostatic cha

27、rge on your body by touching a known earth ground. Alternatively, obtain and wear a commercially available discharging wrist strap device, which should be removed for potential shock reasons prior to applying power to the unit under test. 2.After removing an electrical assembly equipped with ES devi

28、ces, place the assembly on a conductive surface such as aluminum foil, to prevent electrostatic charge buildup or exposure of the assembly. 3.Use only a grouned-tip soldering iron to solder or unsolder ES devices. 4.Use only an anti-static solder removal device. Some solder removal devices not class

29、ified a “anti-static” can generate electrical charges sufficient to damage ES devices. 5.Do not use freon-propelled chemicals. These can generate electrical charge sufficient to damage ES devices. 6.Do not remove a replacement ES device from its protective package until immediately before you are re

30、ady to install it. (Most replacement ES devices are packaged with leads electrically shorted together by conductive foam, aluminum foil, or comparable conductive material). 7.Immediately before removing the protective material from the leads of a replacement ES device, touch the protective material

31、to the chassis or circuit assembly into which the device will be installed. Caution : Be sure no power is applied to the chassis or circuit, and observe all other safety precautions. 8.Minimize bodily motions when handling unpackaged replacement ES devices. (Normally harmless motion such as the brus

32、hing together of your clothes fabric or the lifting of your foot from a carpeted floor can generate static electricity sufficient to damage an ES device.) 1-5 SERVICE INFORMATION FOR EEPROM POWER ON Press number 08, Press charater AF (16 for a while) Press pause key once Change will be applied when

33、power OFF-ON. Use arrow key (F D G E) to move to approprite position and make changes DVD LOGO Status (NO Disk status) Remotecontrol Pause key-1-4-7-2 in order. MODEL : NAMEHEX OPT 1 00 OPT 2 00 OPT 3 00 OPT 4 00 OPT 5 00 OPT 6 00 OPT 7 00 OPT 800 DETECT NEW EEPROM (OPTION EDIT SCREEN) 1-6 SPECIFICA

34、TIONS GENERAL Power requirements :AC 200-240V , 50/60Hz Power consumption :8W Dimensions (Approx.) :430 x 35 x 202mm (17 x 1.4 x 7.9inches) (W x H x D) without foot Net Weight (Approx.) :1.9kg (4.2lbs) Operating temperature :5C to 35C (41F to 95F) Operating humidity :5% to 90% OUTPUTS VIDEO OUT :1.0

35、V (p-p), 75, sync negative, RCA jack x 1 / Scart (to TV) S-VIDEO OUT :(Y) 1.0 V (p-p), 75, negative sync, Mini DIN 4-pin x 1 (C) 0.3 V (p-p), 75 COMPONENT VIDEO OUT :(Y) 1.0 V (p-p), 75, negative sync, RCA jack x 1 (Pb)/(Pr) 0.7 V (p-p), 75, RCA jack x 2 AUDIO OUT :2.0Vrms (1 KHz, 0 dB), 600, RCA ja

36、ck (L, R) x 1 / Scart (to TV) DIGITAL OUT (COAXIAL) :0.5V (p-p), 75, RCA jack x 1 Scart model only SYSTEM Laser :Semiconductor laser, wavelength 650 nm Signal system :PAL/NTSC Frequency response :DVD (PCM 96kHz) : 8Hz to 44kHz DVD (PCM 48 kHz) : 8Hz to 22kHz CD : 8Hz to 20kHz Signal-to-noise ratio :

37、More than 90dB (ANALOG OUT connectors only) Harmonic distortion :Less than 0.02% Dynamic range :More than 95dB (DVD/CD) Accessories :Video cable (1), Audio cable (1), Remote control (1), Batteries (2) Note : Design and specifications are subject to change without prior notice. 2-1 SECTION 2 CABINET

38、& MAIN CHASSIS CONTENTS EXPLODED VIEWS.2-2 1. CABINET AND MAIN FRAME SECTION .2-2 2. DECK MECHANISM SECTION (DP-11) .2-3 3. PACKING ACCESSORY SECTION .2-4 452 A C D B A C B D OPTIONAL PART 463/460 463/460 463 461 462 462 463/460 250 462 A48 A43 462 A44 A49 A42 A41 A46 P101 P8601 CABLE1 CN903 A47 300

39、 A26 283 452 280 279 276 261 261 260 262 320 467 465 261 KARAOKE MAIN SMPS 5.1CH SCART KEY TIMER 2-2 EXPLODED VIEWS 1. CABINET AND MAIN FRAME SECTION 275 2-3 2. DECK MECHANISM SECTION (DP-11) A26 A02 439 018 013 017 014 001 002 003 020 016 015B 015A 435 015 019 440 432 012A 010 439 431 435 030 024 0

40、25 036 A03 430 021 012A 012 012 026 A01 2-4 3. PACKING ACCESSORY SECTION 3-1 SECTION 3 ELECTRICAL CONTENTS ELECTRICAL TROUBLESHOOTING GUIDE.3-2 1. POWER CHECK FLOW .3-2 2. SYSTEM OPERATION FLOW.3-3 3. SYSTEM TEST FLOW.3-4 DETAILS AND WAVEFORMS ON SYSTEM TEST AND DEBUGGIBG.3-10 1. SYSTEM 27MHZ CLOCK,

41、 RESET, FLASH R/W SIGNAL .3-10 2. SDRAM CLOCK .3-12 3. TRAY OPEN/CLOSE SIGNAL.3-12 4. SLED CONTROL RELATED SIGNAL (NO DISC CONDITION).3-13 5. LENS CONTROL RELATED SIGNAL (NO DISC CONDITION).3-13 6. LASER POWER CONTROL RELATED SIGNAL (NO DISC CONDITION) .3-14 7. DISC TYPE JUDGEMENT WAVEFORM.3-14 8. F

42、OCUS ON WAVEFORM .3-16 9. SPINDLE CONTROL WAVEFORM (NO DISC CONDITION).3-17 10. TRACKING CONTROL RELATED SIGNAL (SYSTEM CHECKING) .3-18 11. MT1389E AUDIO OPTICAL AND COAXIAL OUTPUT (SPDIF).3-19 12. MT1389E VIDEO OUTPUT WAVEFORM.3-19 13. AUDIO OUTPUT FROM MT1389E.3-20 CONNECTOR PICTURE.3-21 1. FULL CONNECTOR PICTURE .3-21 2. CN201 CONNECTOR PICTURE.3-22 3. CN202 CONNECTOR PICTURE.3-22 4. CN601 CONNECTOR PICTURE.3-23 5. CN602 CONNECTOR PICTURE.3-23 6. CN605 CONNECTOR PICTURE.