Zenith-DVT412-dvd-sm 维修电路原理图.pdf

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1、RadioFans.CN 收音机爱 好者资料库- 1-1 -CONTENTS SECTION 1.GENERAL SERVICING PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2 ESD PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

2、-4 SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-5 LOCATION OF CUSTOMER CONTROLS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6 SECTION 2. AUDIO PART AUDIO TROUBLESHOOTING GUIDE . . . .

3、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1 BLOCK DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5 SCHEMATIC DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4、. . . . . . . . . . . . . . 2-7 WIRING DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-17 PRINTED CIRCUIT DIARGAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-19 SECTION 3.DVD PART ELE

5、CTRICAL TROUBLESHOOTING GUIDE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-1 DETAILS AND WAVEFORMS ON SYSTEM TEST AND DEBUGGING . . . . . . . . . . . . . . . . .3-9 BLOCK DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6、. . . . . . . .3-22 DVD PART SCHEMATIC DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-23 VOLTAGE SHEET (IC &TR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-31 PRINTED CIRCUIT DIAGRAM . . . . . . . . . .

7、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-33 SECTION 4. EXPLODED VIEWS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-1 SECTION 5. SPEAKER PART . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-1 SECTION 6. REPLACEMENT P

8、ARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . .6-1RadioFans.CN 收音机爱 好者资料库- 1-2 -SECTION 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

9、) The pick-up should never be subjected to external pressure or impact.2. Repair notes1) 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 andimp

10、act. If it is subjected to strong pressure or impact, the result may be an operational malfunction 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 shoul

11、d absolutely never be touched.4) Laser beams may damage the eyes!Absolutely 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 surfaceIf there is dust on the lens surface, the dust shoul

12、d be cleaned away by using an air bush (such as usedfor camera lens).The lens is held by a delicate 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 ex

13、tremely dirty, apply isopropyl alcohol to the cotton swab. (Donot use any other liquid cleaners, 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 directl

14、y at the laser beam, and dont let contact fingers or other exposed skin.MagnetHow to hold the pick-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).T

15、hese componentsare sensitive to, and easily affected by, static electricity. If such static electricity 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. Car

16、e must betaken, therefore, 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 repair1) Before replacing a component part, first disconnect the power supply lead wire from the unit2) All equipment, me

17、asuring instruments 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 isbecause there is the possibility of damage by static electricity.)4) To prevent

18、 AC leakage, the 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

19、) The laser beam from the pick-up should NEVER be directly facing the eyes or bare skin.Resistor(1 Mohm)ConductiveSheetResistor(1 Mohm)Armband BLOCK DIAGRAM2-52-62-72-8 SCHEMATIC DIAGRAMS POWER (SMPS) SCHEMATIC DIAGRAM2-92-10 -COM SCHEMATIC DIAGRAM2-112-12 FRONT & POWER(2nd) SCHEMATIC DIAGRAM2-132-1

20、4 DAP SCHEMATIC DIAGRAM2-152-16 AMP SCHEMATIC DIAGRAM2-172-18 WIRING DIAGRAM2-192-20 PRINTED CIRCUIT BOARD DIAGRAMS MAIN P.C. BOARD DIAGRAM (SOLDER SIDE)2-212-22 MAIN P.C. BOARD DIAGRAM (COMPONENT SIDE)2-232-24 POWER(SMPS) P.C. BOARD (SOLDER SIDE)2-252-26 FRONT P.C. BOARD DIAGRAM (SOLDER SIDE)3-213-

21、22 DVD PART SCHEMATIC DIAGRAMS MPEG SCHEMATIC DIAGRAM3-233-24 SERVO SCHEMATIC DIAGRAM3-253-26 AUDIO SCHEMATIC DIAGRAM3-273-28 VOLTAGE SHEET (IC& TR)3-293-30 PRINTED CIRCUIT DIAGRAM DVD P.C. BOARD(SOLDER SIDE)3-313-32 DVD P.C. BOARD (COMPONENT SIDE)4-14-2SECTION 4. EXPLODED VIEWS CABINET AND MAIN FRA

22、ME SECTION351320305454455455454A46454A26280275277455A43455455250265269303301A47A41454454454454NOTE) Refer to “SECTION 6 REPLACEMENTPARTS LIST” in order to look for the part number of each part.4-34-4 DECK MECHANISM EXPLODED VIEW4-54-6MEMOMEMO- 1-4 - ESD PRECAUTIONSElectrostatically Sensitive Devices

23、 (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 devices are integratedcircuits and some field-effect transistors and semiconductor chip components.The fol

24、lowing 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 assembly, drain offany electrostatic charge on your body by touching a known earth ground. Alternatively,

25、 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 electrical assembly equipped with ESD devices, place the assembly on a conductive sur-face such as aluminum

26、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 device. Some solder removal devices not classified as anti-static cangenerate electrical charges sufficient

27、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 package until immediately before you areready to install it. (Most replacement ESD devices are packaged wi

28、th 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 ESD device, touch theprotective material to the chassis or circuit assembly into which the device will by

29、 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. (Otherwise harmless motionsuch as the brushing together of your clothes fabric or the lifting of your foot f

30、rom 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, ISINTENDED TO ALERT THE SERVICE PERSONNEL TO THE PRESENCE OF UNINSULATED “DANGER-OUS VOLTAGE” THAT MAY BE OF SU

31、FFICIENT 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 INFORMATION IN SERVICELITERATURE.- 1-5 - SPECIFICATIONS- 1-6 - LOCATION OF CUSTOMER CONTROLSFRONT PANELDISPLAY W

32、INDOW- 1-7 -REAR PANEL- 1-8 -Remote Control- 2-1 -SECTION 2. AUDIO PART AUDIO TROUBLESHOOTING GUIDE1. POWER SUPPUY CIRCUIT- 2-2 -2. FRONT CIRCUIT (1/2)- 2-3 -3. FRONT CIRCUIT (2/2)- 2-4 -MEMO- 3-1 -SECTION 3. DVD PART DVD TROUBLESHOOTING GUIDE1. Power check flow- 3-2 -2.Test & debug flow- 3-3 - 3-4

33、- 3-5 - 3-6 - 3-7 - 3-8 - DETAILS AND WAVEFORMS ON SYSTEM TESTAND DEBUGGING1. SYSTEM 27MHz CLOCK,RESET,FLASH R/W SIGNAL1) MT1379 main clock is at 27MHz(X501)2) MT1336 reset is high active- 3-9 -3) RS232 waveform during procedure(Downloading)4) Flash R/W enable signal during download(Downloading)- 3-

34、10 -2. SDRAM CLOCK1) MT1379 main clock is at 27MHz(X501)3.TRAY OPEN/CLOSE SIGNAL1) Tray open/close waveform- 3-11 -2) Tray close waveform3) Tray open waveform- 3-12 -4. SLED CONTROL RELATED SIGNAL (NO DISC CONDITION)5. LENS CONTROL RELATED SIGNAL(NO DISC CONDITION)- 3-13 -6. LASER POWER CONTROL RELA

35、TED SIGNAL(NO DISC CONDITION)7. DISC TYPE JUDGEMENT WAVEFORM- 3-14 - 3-15 -8. FOCUS ON WAVEFORM- 3-16 -9. SPINDLE CONTROL WAVEFORM (NO DISC CONDITION)- 3-17 -10.TRACKING CONTROL RELATED SIGNAL(System checking)- 3-18 -11. RF WAVEFORM12. MT1379 AUDIO OPTICAL AND COAXIAL OUTPUT (ASPDIF)- 3-19 -13. MT1379 VIDEO OUTPUT WAVEFORM1) Full colorbar signal(CVBS)2) Y- 3-20 -3) C14. AUDIO OUTPUT FORM AUDIO DAC1) Audio related Signal- 5-1 -SECTION 5. SPEAKER SECTION MODEL : LHS-D6245W858856857855859859861852854852851- 5-2 - MODEL : LHS-D6245T861854853861852860862862851850