LG-LHT6245-cdr-sm 维修电路原理图.pdf

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1、DVD/CD RECEIVERSERVICE MANUAL MODEL:LH-T6245LH-T6245ALHS-T6245T, LHS-T6245WSERVICE MANUAL MODEL: LH-T6245 (LH-T6245A LHS-T6245T, LHS-T6245W)CD-R/RWRadioFans.CN 收音机爱 好者资料库- 1-1 -CONTENTS SECTION 1.GENERAL SERVICING PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2、. . . . . . . . . . 1-2 ESD PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4 SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-5 SECTION 2. AUDIO PAR

3、T AUDIO TROUBLESHOOTING GUIDE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1 BLOCK DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5 SCHEMATIC DIAGRAMS . . . . . . . . . . . . . . . . . .

4、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7 WIRING DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-17 PRINTED CIRCUIT DIARGAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5、. . . . . 2-19 SECTION 3.DVD PART TROUBLESHOOTING GUIDE ELECTRICAL TROUBLESHOOTING GUIDE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-1 DVD PART SCHEMATIC DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-7 SECTION 4. EXPLODED V

6、IEWS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-1 SECTION 5. SPEAKER PART . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-1 SECTION 6. REPLACEMENT PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . .6-1RadioFans.CN 收音机爱 好者资料库- 1-2 -S

7、ECTION 1. GENERAL SERVICING PRECAUTIONSNOTES REGARDING HANDLING OF THE PICK-UP1. Notes for transport and storage1) The pick-up should always be left in its conductive bag until immediately prior to use.2) The pick-up should never be subjected to external pressure or impact.2. Repair notes1) The pick

8、-up incorporates a strong magnet, and so should never be brought close to magnetic materials.2) The pick-up should always be handled correctly and carefully, taking care to avoid external pressure andimpact. If it is subjected to strong pressure or impact, the result may be an operational malfunctio

9、n and/ordamage to the printed-circuit board.3) Each and every pick-up is already individually adjusted to a high degree of precision, and for that reasonthe adjustment point and installation screws should absolutely never be touched.4) Laser beams may damage the eyes!Absolutely never permit laser be

10、ams to enter the eyes!Also NEVER switch ON the power to the laser output part (lens, etc.) of the pick-up if it is damaged.5) Cleaning the lens surfaceIf there is dust on the lens surface, the dust should be cleaned away by using an air bush (such as usedfor camera lens).The lens is held by a delica

11、te spring. When cleaning the lens surface, therefore, a cottonswab should be used, taking care not to distort this.6) Never attempt to disassemble the pick-up.Spring by excess pressure. If the lens is extremely dirty, apply isopropyl alcohol to the cotton swab. (Donot use any other liquid cleaners,

12、because they will damage the lens.) Take care not to use too much ofthis alcohol on the swab, and do not allow the alcohol to get inside the pick-up.Storage in conductive bagDrop impactNEVER look directly at the laser beam, and dont let contact fingers or other exposed skin.MagnetHow to hold the pic

13、k-upConductive SheetCotton swabPressurePressure- 1-3 -NOTES REGARDING COMPACT DISC PLAYER REPAIRS1. Preparations1) Compact disc players incorporate a great many ICs as well as the pick-up (laser diode).These componentsare sensitive to, and easily affected by, static electricity. If such static elect

14、ricity is high voltage, componentscan be damaged, and for that reason components should be handled with care.2) The pick-up is composed of many optical components and other high-precision components. Care must betaken, therefore, to avoid repair or storage where the temperature of humidity is high,

15、where strong magnet-ism is present, or where there is excessive dust.2. Notes for repair1) Before replacing a component part, first disconnect the power supply lead wire from the unit2) All equipment, measuring instruments and tools must be grounded.3) The workbench should be covered with a conducti

16、ve sheet and grounded.When removing the laser pick-up from its conductive bag, do not place the pick-up on the bag. (This isbecause there is the possibility of damage by static electricity.)4) To prevent AC leakage, the metal part of the soldering iron should be grounded.5) Workers should be grounde

17、d by an armband (1M )6) Care should be taken not to permit the laser pick-up to come in contact with clothing, in order to prevent sta-tic electricity changes in the clothing to escape from the armband.7) The laser beam from the pick-up should NEVER be directly facing the eyes or bare skin.Resistor(

18、1 Mohm)ConductiveSheetResistor(1 Mohm)Armband- 1-4 - ESD PRECAUTIONSElectrostatically Sensitive Devices (ESD)Some semiconductor (solid state) devices can be damaged easily by static electricity. Such componentscommonly are called Electrostatically Sensitive Devices (ESD). Examples of typical ESD dev

19、ices are integratedcircuits and some field-effect transistors and semiconductor chip components.The following techniques shouldbe used to help reduce the incidence of component damage caused by static electricity.1. Immediately before handling any semiconductor component or semiconductor-equipped as

20、sembly, drain offany electrostatic charge on your body by touching a known earth ground. Alternatively, obtain and wear acommercially available discharging wrist strap device, which should be removed for potential shock reasonsprior to applying power to the unit under test.2. After removing an elect

21、rical assembly equipped with ESD devices, place the assembly on a conductive sur-face such as aluminum foil, to prevent electrostatic charge buildup or exposure of the assembly.3. Use only a grounded-tip soldering iron to solder or unsolder ESD devices.4. Use only an anti-static solder removal devic

22、e. Some solder removal devices not classified as anti-static cangenerate electrical charges sufficient to damage ESD devices.5. Do not use freon-propelled chemicals.These can generate electrical charges sufficient to damage ESDdevices.6. Do not remove a replacement ESD device from its protective pac

23、kage until immediately before you areready to install it. (Most replacement ESD devices are packaged with leads electrically shorted together byconductive foam, aluminum foil or comparable conductive materials).7. Immediately before removing the protective material from the leads of a replacement ES

24、D device, touch theprotective material to the chassis or circuit assembly into which the device will by installed.CAUTION : BE SURE NO POWER IS APPLIED TO THE CHASSIS OR CIRCUIT, AND OBSERVE ALLOTHER SAFETY PRECAUTIONS.8. Minimize bodily motions when handing unpackaged replacement ESD devices. (Othe

25、rwise harmless motionsuch as the brushing together of your clothes fabric or the lifting of your foot from a carpeted floor can gen-erate static electricity sufficient to damage an ESD device).CAUTION. GRAPHIC SYMBOLSTHE LIGHTNING FLASH WITH APROWHEAD SYMBOL. WITHIN AN EQUILATERAL TRIANGLE, ISINTEND

26、ED TO ALERT THE SERVICE PERSONNEL TO THE PRESENCE OF UNINSULATED “DANGER-OUS VOLTAGE” THAT MAY BE OF SUFFICIENT MAGNITUDE TO CONSTITUTE A RISK OF ELECTRICSHOCK.THE EXCLAMATION POINT WITHIN AN EQUILATERAL TRIANGLE IS INTENDED TO ALERT THESERVICE PERSONNEL TO THE PRESENCE OF IMPORTANT SAFETY INFORMATI

27、ON IN SERVICELITERATURE.- 1-5 - SPECIFICATIONS- 1-6 - 2-1 -SECTION 2. AUDIO PART AUDIO TROUBLESHOOTING GUIDE1. POWER SUPPLY CIRCUIT- 2-2 -2. FRONT CIRCUIT (1/2)- 2-3 -3. FRONT CIRCUIT (2/2)- 2-4 -MEMO BLOCK DIAGRAM2-52-62-72-8 SCHEMATIC DIAGRAMS POWER SCHEMATIC DIAGRAM2-92-10 MICOM SCHEMATIC DIAGRAM

28、2-112-12 FRONT SCHEMATIC DIAGRAM2-132-14 DSP& SCHEMATIC DIAGRAM2-152-16 SMPS-NARROW&WIDE SCHEMATIC DIAGRAM2-172-18 WIRING DIAGRAM2-192-20 PRINTED CIRCUIT BOARD DIAGRAMS MAIN/DVD P.C. BOARD DIAGRAM (BOTTOM)2-212-22 MAIN/DVD P.C. BOARD DIAGRAM (TOP)2-232-24 FRONT P.C. BOARD (TOP)2-252-26 FRONT P.C.

29、 BOARD (BOTTOM) 2-272-28 SMPS P.C. BOARD - 3-1 -SECTION 3. DVD PART TROUBLESHOOTING GUIDE1.Test & debug flow- 3-2 - 3-3 - 3-4 - 3-5 - 3-6 -3-73-8 DVD SCHEMATIC DIAGRAMS DVD MPEG & DSP SCHEMATIC DIAGRAM3-93-10 DVD RF SERVO SCHEMATIC DIAGRAM4-14-2351305313A47302303451451A46451451A26451A432812864542802

30、75SECTION 4. EXPLODED VIEWS CABINET AND MAIN FRAME SECTION4-34-4 DECK MECHANISM EXPLODED VIEWLOCA. NO.PART NO.DESCRIPTIONSPECIFICATIONA266721RJ0856EDECK ASSEMBLY,AUDIODECK/MECHA DP-7T(HZ)-ESS -(M:MA014861R-0016DCLAMP ASSEMBLYDECK/MECHA DISC DP-7C(7A) -HZA023041R-M040ABASE ASSEMBLYMAIN DP-7T-HZA03304

31、1R-M061DBASE ASSEMBLYSLED DP-7A-HZ ESS (M: MITSUMI0013300R-0547APLATECLAMP0025016H-1016BMAGNETCLAMP(LDM-R608,10*5,1*1.5T)0034860R-0021ACLAMPUPPER DP70044930R-0402AHOLDERCLAMP DP-7A0106850R-GK22ZCABLE,FLATP=1.0 FFC UL2896(0.05X0.65) 110113210R-M002AFRAMEUP/DOWN MOLD DP7C011A6850R-JW16BCABLE,FLATP=1.0

32、 FFC UL2896(0.035X0.7) 230125040R-0075DRUBBERDAMPER DP7 (YAMAUCHI 30)0134400R-0006BBELTDECK/MECHA DP2-5, DP7C,DP7A OT0144470R-0055AGEARPULLEY0156871RJ4415APWB(PCB) ASSEMBLY,JACKPWB(PCB) TOTAL LOADING-HZ015A4681R-1023GMOTOR ASSEMBLYDECK/MECHA LOADING-HZ015B4560R-0008APULLEYMOTOR015C4680R-E010AMOTOR(M

33、ECH)FEEDING BCZ3B51 SANKYO FOR DP70174470R-0056AGEARLOADING0184974R-0023AGUIDEUP/DOWN0203040R-D005ABASEMAIN DP-7T MOLD (SLIM)0214680R-C011AMOTOR(MECH)SPINDLE JCL9B68 SANKYO FOR COM0224681R-0034DMOTOR ASSEMBLYDECK/MECHA FEEDING DP-7C(7A) -0244470R-0131AGEARPINION DP7C024A5006R-0044ACAPSKEW-T DP7C024B

34、5006R-0043ACAPSKEW DP7C0254470R-0130AGEARMIDDLE DP7C0263390R-0026ATRAYDVD DP-7T MOLD DISC0284370R-0082BSHAFTDECK/MECHA PU R DP-7C OTHER0294370R-0082ASHAFTPU DP-7C0304471R-0013DGEAR ASSEMBLYDECK/MECHA RACK DP-7C(7A) -HZ0316716DPH005BPICK UP,DVDPVR-502W R52 0219 MITSUMI PLAY4291SZZR-0012ASCREW,DRAWING

35、B-TITE4301SZZH-1003ASCREW,DRAWING+ D2.0 6MM SWRCH16A/NIY 4.5MM4311SZZH-1007BSCREW,DRAWING+ D2.0 6MM SWRCH16A/ZNBK 4MM 14321SZZR-0023BSCREW,DRAWING+ 1 D1.7 L6.0 SWRCH16A/FZY RAC4331SZZR-0050ASCREW,DRAWING+ 1 D2.0 L4.5 SWRCH16A/ZNY S-T4351SZZR-0011ASCREW,DRAWINGMACHINE- 5-1 -SECTION 5. SPEAKER SECTION MODEL : LHS-T6245T753755752754751750- 5-2 - MODEL : LHS-T6245W854856855853850852857851