LG-LHT6340-cdr-sm 电路图 维修手册.pdf

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1、- 1-1 - CONTENTS SECTION 1.GENERAL SERVICING PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2 ESD PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4 SPECIFICATIONS . .

2、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-5 SECTION 2. AUDIO PART AUDIO TROUBLESHOOTING GUIDE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1 BLOCK DIAGRAM . . . . . . . . . . . . . . . . . . . .

3、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5 SCHEMATIC DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7 WIRING DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4、 . . . . . . . . . . . 2-17 PRINTED CIRCUIT DIARGAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-19 SECTION 3.DVD PART TROUBLESHOOTING GUIDE ELECTRICAL TROUBLESHOOTING GUIDE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-1 DVD P

5、ART SCHEMATIC DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-7 PRINTED CIRCUIT DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-11 SECTION 4. EXPLODED VIEWS . . . . . . . . . . . . . . . . . . . . . .

6、. . . . . . . . . . . . .4-1 SECTION 5. SPEAKER PART . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-1 SECTION 6. REPLACEMENT PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . .6-1 RadioFans.CN 收音机爱 好者资料库 - 1-2 - SECTION 1. GENERAL SERVICING PRECAUTIONS NOTES

7、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 notes 1) The pick-up incorporates a strong magnet, and so

8、 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 operational malfunction and/or damage to the printed-circuit

9、 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! Absolutely never permit laser beams to enter the eyes! Also NEVER

10、 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).The lens is held by a delicate spring. When cleaning the

11、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 use any other liquid cleaners, because they will damage

12、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 exposed skin. Magnet How to hold the pick-up Conductive Shee

13、t 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 sensitive to, and easily affected by, static electricity. If such

14、 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, therefore, to avoid repair or storage where the temperature of hu

15、midity 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 and tools must be grounded. 3) The workbench should be co

16、vered 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 metal part of the soldering iron should be grounded. 5)

17、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 beam from the pick-up should NEVER be directly facing the

18、 eyes or bare skin. Resistor (1 Mohm) Conductive Sheet Resistor (1 Mohm) Armband RadioFans.CN 收音机爱 好者资料库 - 1-4 - ESD PRECAUTIONS Electrostatically Sensitive Devices (ESD) Some semiconductor (solid state) devices can be damaged easily by static electricity. Such components commonly are called Electro

19、statically 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 electricity. 1. Immediately before

20、 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 for potential shock reasons prio

21、r 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 grounded-tip soldering iron to solder

22、 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 electrical charges sufficient to damage E

23、SD 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 conductive materials). 7. Immedi

24、ately 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 OBSERVE ALL OTHER SAFETY PRECAUTION

25、S. 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 ESD device). CAUTION. GRAPHIC SYM

26、BOLS 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 POINT WITHIN AN EQUILATERAL TRIA

27、NGLE IS INTENDED TO ALERT THE SERVICE PERSONNEL TO THE PRESENCE OF IMPORTANT SAFETY INFORMATION IN SERVICE LITERATURE. - 1-6 - - 2-1 - SECTION 2. AUDIO PART AUDIO TROUBLESHOOTING GUIDE 1. POWER SUPPLY CIRCUIT - 2-2 - 2. FRONT CIRCUIT (1/2) - 2-3 - 3. FRONT CIRCUIT (2/2) - 2-4 - MEMO - 3-1 - SECTION

28、3. DVD PART TROUBLESHOOTING GUIDE 1.Test & debug flow Check the Tray control IO pins on ES6698FD. - 3-2 - - 3-3 - - 3-4 - - 3-5 - - 3-6 - - 5-1 - SECTION 5. SPEAKER SECTION MODEL : LHS-T6340T 753 755 752 754 751 750 - 5-2 - MODEL : LHS-T6340W 854 856 855 853 850 852 857 851 BLOCK DIAGRAM 2-52-6 2-72

29、-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&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

30、MAIN/DVD P.C. BOARD DIAGRAM (TOP) 2-232-24 FRONT P.C. BOARD (BOTTOM) 2-252-26 FRONT P.C. BOARD (TOP) 2-272-28 SMPS P.C. BOARD 3-73-8 DVD SCHEMATIC DIAGRAMS DVD MPEG & DSP SCHEMATIC DIAGRAM ES6698FD 3-93-10 DVD RF SCHEMATIC DIAGRAM 4-14-2 351 305 313 A47 314 302 303 451 451 A46 451 451 A26 451 A43 286 454 280 275 SECTION 4. EXPLODED VIEWS CABINET AND MAIN FRAME SECTION 4-34-4 DECK MECHANISM EXPLODED VIEW