LG-LHT6347-cdr-sm 电路图 维修手册.pdf

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1、DVD/CD RECEIVER SERVICE MANUAL CD-R/RW MODEL:LH-T6347 LH-T6347X LHS-T6347T, LHS-T6347W SERVICE MANUAL MODEL: LH-T6347 (LH-T6347X LHS-T6347T, LHS-T6347W) RadioFans.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. A

3、UDIO PART 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. EX

6、PLODED VIEWS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-1 SECTION 5. SPEAKER PART . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-1 SECTION 6. REPLACEMENT PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . .6-1 RadioFans.CN 收音机爱 好者资料

7、库 - 1-2 - SECTION 1. GENERAL SERVICING PRECAUTIONS NOTES REGARDING HANDLING OF THE PICK-UP 1. Notes for transport and storage 1) 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

8、notes 1) The pick-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 and impact. If it is subjected to strong pressure or impact, the result may be an ope

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

10、ly never permit laser beams 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 surface If there is dust on the lens surface, the dust should be cleaned away by using an air bush (such as used for camera lens).

11、The lens is held by a delicate spring. When cleaning the lens surface, therefore, a cotton swab 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. (Do not

12、 use any other liquid cleaners, because they will damage the lens.) Take care not to use too much of this alcohol on the swab, and do not allow the alcohol to get inside the pick-up. Storage in conductive bagDrop impact NEVER look directly at the laser beam, and dont let contact fingers or other exp

13、osed skin. Magnet How to hold the pick-up Conductive Sheet Cotton swab Pressure Pressure RadioFans.CN 收音机爱 好者资料库 - 1-3 - NOTES REGARDING COMPACT DISC PLAYER REPAIRS 1. Preparations 1) Compact disc players incorporate a great many ICs as well as the pick-up (laser diode).These components are sensitiv

14、e to, and easily affected by, static electricity. If such static electricity is high voltage, components can 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 be taken, therefor

15、e, to avoid repair or storage where the temperature of humidity is high, where strong magnet- ism is present, or where there is excessive dust. 2. Notes for repair 1) Before replacing a component part, first disconnect the power supply lead wire from the unit 2) All equipment, measuring instruments

16、and tools must be grounded. 3) The workbench should be covered with a conductive sheet and grounded. When removing the laser pick-up from its conductive bag, do not place the pick-up on the bag. (This is because there is the possibility of damage by static electricity.) 4) To prevent AC leakage, the

17、 metal part of the soldering iron should be grounded. 5) Workers should be grounded 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

18、beam from the pick-up should NEVER be directly facing the eyes or bare skin. Resistor (1 Mohm) Conductive Sheet Resistor (1 Mohm) Armband - 1-4 - ESD PRECAUTIONS Electrostatically Sensitive Devices (ESD) Some semiconductor (solid state) devices can be damaged easily by static electricity. Such compo

19、nents commonly are called Electrostatically Sensitive Devices (ESD). Examples of typical ESD devices are integrated circuits and some field-effect transistors and semiconductor chip components.The following techniques should be used to help reduce the incidence of component damage caused by static e

20、lectricity. 1. Immediately before handling any semiconductor component or semiconductor-equipped assembly, drain off any electrostatic charge on your body by touching a known earth ground. Alternatively, obtain and wear a commercially available discharging wrist strap device, which should be removed

21、 for potential shock reasons prior to applying power to the unit under test. 2. After removing an electrical 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 grou

22、nded-tip soldering iron to solder or unsolder ESD devices. 4. Use only an anti-static solder removal device. Some solder removal devices not classified as anti-static can generate electrical charges sufficient to damage ESD devices. 5. Do not use freon-propelled chemicals.These can generate electric

23、al charges sufficient to damage ESD devices. 6. Do not remove a replacement ESD device from its protective package until immediately before you are ready to install it. (Most replacement ESD devices are packaged with leads electrically shorted together by conductive foam, aluminum foil or comparable

24、 conductive materials). 7. Immediately before removing the protective material from the leads of a replacement ESD device, touch the protective 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 OB

25、SERVE ALL OTHER SAFETY PRECAUTIONS. 8. Minimize bodily motions when handing unpackaged replacement ESD devices. (Otherwise harmless motion such 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

26、ESD device). CAUTION. GRAPHIC SYMBOLS THE LIGHTNING FLASH WITH APROWHEAD SYMBOL. WITHIN AN EQUILATERAL TRIANGLE, IS INTENDED TO ALERT THE SERVICE PERSONNEL TO THE PRESENCE OF UNINSULATED “DANGER- OUS VOLTAGE” THAT MAY BE OF SUFFICIENT MAGNITUDE TO CONSTITUTE A RISK OF ELECTRIC SHOCK. THE EXCLAMATION

27、 POINT WITHIN AN EQUILATERAL TRIANGLE IS INTENDED TO ALERT THE SERVICE PERSONNEL TO THE PRESENCE OF IMPORTANT SAFETY INFORMATION IN SERVICE LITERATURE. - 1-5 - SPECIFICATIONS 83 dB/W (1m) 88 x 100 x 95 mm 0.54 kg 160 x 350 x 325 mm 4.12 kg 2 1 - 1-6 - - 2-1 - SECTION 2. AUDIO PART AUDIO TROUBLESHOOT

28、ING GUIDE 1. POWER SUPPLY CIRCUIT - 2-2 - 2. FRONT CIRCUIT (1/2) - 2-3 - 3. FRONT CIRCUIT (2/2) - 2-4 - MEMO BLOCK DIAGRAM 2-52-6 2-72-8 SCHEMATIC DIAGRAMS POWER SCHEMATIC DIAGRAM 2-92-10 MICOM SCHEMATIC DIAGRAM 2-112-12 FRONT SCHEMATIC DIAGRAM 2-132-14 DSP& SCHEMATIC DIAGRAM 2-152-16 SMPS-NARROW

29、&WIDE SCHEMATIC DIAGRAM 2-172-18 WIRING DIAGRAM 2-192-20 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. BOARD (BOTTOM) 2-272-28 SMPS P.C. BOARD - 3-1 - SECTION 3. DVD PART TROUBLESHOOT

30、ING GUIDE 1.Test & debug flow - 3-2 - - 3-3 - - 3-4 - - 3-5 - - 3-6 - 3-73-8 DVD SCHEMATIC DIAGRAMS DVD MPEG & DSP SCHEMATIC DIAGRAM 3-93-10 DVD RF SERVO SCHEMATIC DIAGRAM 4-14-2 351 305 313 A47 302 303 451 451 A46 451 451 A26 451 A43 281 286 454 280 275 SECTION 4. EXPLODED VIEWS CABINET AND MAIN FR

31、AME SECTION 4-34-4 DECK MECHANISM EXPLODED VIEW LOCA. NO.PART NO.DESCRIPTIONSPECIFICATION A266721RJ0856EDECK ASSEMBLY,AUDIODECK/MECHA DP-7T(HZ)-ESS -(M:M A014861R-0016DCLAMP ASSEMBLYDECK/MECHA DISC DP-7C(7A) -HZ A023041R-M040ABASE ASSEMBLYMAIN DP-7T-HZ A033041R-M061DBASE ASSEMBLYSLED DP-7A-HZ ESS (M

32、: MITSUMI 0013300R-0547APLATECLAMP 0025016H-1016BMAGNETCLAMP(LDM-R608,10*5,1*1.5T) 0034860R-0021ACLAMPUPPER DP7 0044930R-0402AHOLDERCLAMP DP-7A 0106850R-GK22ZCABLE,FLATP=1.0 FFC UL2896(0.05X0.65) 11 0113210R-M002AFRAMEUP/DOWN MOLD DP7C 011A6850R-JW16BCABLE,FLATP=1.0 FFC UL2896(0.035X0.7) 23 0125040R

33、-0075DRUBBERDAMPER DP7 (YAMAUCHI 30) 0134400R-0006BBELTDECK/MECHA DP2-5, DP7C,DP7A OT 0144470R-0055AGEARPULLEY 0156871RJ4415APWB(PCB) ASSEMBLY,JACKPWB(PCB) TOTAL LOADING-HZ 015A4681R-1023GMOTOR ASSEMBLYDECK/MECHA LOADING-HZ 015B4560R-0008APULLEYMOTOR 015C4680R-E010AMOTOR(MECH)FEEDING BCZ3B51 SANKYO

34、FOR DP7 0174470R-0056AGEARLOADING 0184974R-0023AGUIDEUP/DOWN 0203040R-D005ABASEMAIN DP-7T MOLD (SLIM) 0214680R-C011AMOTOR(MECH)SPINDLE JCL9B68 SANKYO FOR COM 0224681R-0034DMOTOR ASSEMBLYDECK/MECHA FEEDING DP-7C(7A) - 0244470R-0131AGEARPINION DP7C 024A5006R-0044ACAPSKEW-T DP7C 024B5006R-0043ACAPSKEW

35、DP7C 0254470R-0130AGEARMIDDLE DP7C 0263390R-0026ATRAYDVD DP-7T MOLD DISC 0284370R-0082BSHAFTDECK/MECHA PU R DP-7C OTHER 0294370R-0082ASHAFTPU DP-7C 0304471R-0013DGEAR ASSEMBLYDECK/MECHA RACK DP-7C(7A) -HZ 0316716DPH005BPICK UP,DVDPVR-502W R52 0219 MITSUMI PLAY 4291SZZR-0012ASCREW,DRAWINGB-TITE 4301S

36、ZZH-1003ASCREW,DRAWING+ D2.0 6MM SWRCH16A/NIY 4.5MM 4311SZZH-1007BSCREW,DRAWING+ D2.0 6MM SWRCH16A/ZNBK 4MM 1 4321SZZR-0023BSCREW,DRAWING+ 1 D1.7 L6.0 SWRCH16A/FZY RAC 4331SZZR-0050ASCREW,DRAWING+ 1 D2.0 L4.5 SWRCH16A/ZNY S-T 4351SZZR-0011ASCREW,DRAWINGMACHINE - 5-1 - SECTION 5. SPEAKER SECTION MODEL : LHS-T6347T 850 851 A800 852 853 862 864 - 5-2 - MODEL : LHS-T6347W 953 954 955 956 964 952 951 950