Cambridge-DVD57-dvd-sm维修电路原理图.pdf

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1、OPEN CLOSE PREV NEXTPLAYPAUSESTOPPOWERSERVICE MANUALDVD57RadioFans.CN 收音机爱 好者资料库CONTENTS1. SAFETY PRECAUTIONS12. PREVENTION OF ELECTRO STATIC DISCHARGE(ESD)TO ELECTROSTATICALLY SENSITIVE(ES)DEVICES14. PREVERTION OF STATIC ELECTRICITY DISCHARGE35. ASSEMBLING AND DISASSEMBLING THE MECHANISM UNIT45.1 O

2、PTICAL PICKUP UNIT EXPLOSED VIEW AND PART LIST 45.2 BRACKET EXPLOSED VIEW AND PART LIST 66. ELECTRICAL CONFIRMATION86.1 VIDEO OUTPUT (LUMINANCE SIGNAL) CONFIRMATION86.2 VIDEO OUTPUT(CHROMINANCE SIGNAL) CONFIRMATION97. MPEG BOARD CHECK WAVEFORM108. IC BLOCK DIAGRAM & DESCRIPTION119. SCHEMATIC & PCB W

3、IRING DIAGRAM 4110. SPARE PARTS LIST538.1 MT1336118.2 MT1379198.3 U214 HY29F800358.4 HY57V641620HG 383. CONTROL BUTTON LOCATIONS AND EXPLANATIONS25.3 MISCELLANEOUS7RadioFans.CN 收音机爱 好者资料库1.1 GENERAL GUIDELINES1. When servicing, observe the original lead dress. if a short circuit is found, replace al

4、l parts which have been overheated or damaged by the short circuit.2. After servicing, see to it that all the protective devices such as insulation barrier, insulation papersshields are properly installed.3. After servicing, make the following leakage current checks to prevent the customer from bein

5、g exposed to shock hazards.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 integratedcircuits and some field-effect transistors and semiconductor chip co

6、mponents. The following techniques should be used to help reduce the incidence of component damage caused by electro static discharge(ESD).1. Immediately before handling any semiconductor component or semiconductor-equipped assembly, drainoff any ESD on your body by touching a known earth ground. Al

7、ternatively, obtain and wear a commercially availabel discharging ESD wrist strap, which should be removed for potential shock reasons prior toapplying power to the unit under test.2. After removing an electrical assembly equipped with ES devices,place the assembly on a conductive surface such as al

8、minum foil, to prevent electrostatic charge buildup or exposure of the assembly.3. Use only a grounded-tip soldering iron to solder or unsolder ES devices.4. Use only an anti-static solder removal device. Some solder removal devices not classified as anti-static(ESD protected)can generate electrical

9、 charge sufficient to damage ES devices.5. Do not use freon-propelled chemicals. These can generate electrical charges sufficient to damage ESdevices.6. Do not remove a replacement ES device from its protective package until immediately before you areready to install it. (Most replacement ES devices

10、 are packaged with leads electrically shorted together by conductive foam, alminum foil or comparable conductive material).7. Immediately before removing the protective material from the leads of a replacement ES device, touchthe protective material to the chassis or circuit assembly into which the

11、device will be installed.CautionBe 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. (Otherwise harmless motionsuch as the brushing together of your clothes fabric or the lifting of

12、 your foot from a carpeted floor cangenerate static electricity(ESD).notice (1885x323x2 tiff)3.Control Button Locations and Explanations Front Panel Illustration Play7Pause86Open / CloseStop925POWER switch2Disc tray4Previous5Next 3VFD display window63789OPEN CLOSE PREV NEXTPLAYPAUSESTOPPOWER4The las

13、er diode in the traverse unit (optical pickup)may brake down due to static electricity of clothes or human body. Use due caution to electrostatic breakdown when servicing and handling the laser diode.4.1.Grounding for electrostatic breakdown preventionSome devices such as the DVD player use the opti

14、cal pickup(laser diode)and the optical pickup will be damaged by static electricity in the working environment.Proceed servicing works under the working environment where grounding works is completed.4.1.1. Worktable grounding1. Put a conductive material(sheet)or iron sheet on the area where the opt

15、ical pickup is placed,and ground the4.1.2.Human body grounding1 Use the anti-static wrist strap to discharge the static electricity from your body.4.1.3.Handling of optical pickup1. To keep the good quality of the optical pickup maintenance parts during transportation and beforeinstallation, the bot

16、h ends of the laser diode are short-circuited.After replacing the parts with new ones,remove the short circuit according to the correct procedure. (See this Technical Guide).2. Do not use a tester to check the laser diode for the optical pickup .Failure to do so willdamage the laserdiode due to the

17、power supply in the tester.4.2. Handling precautions for Traverse Unit (Optical Pickup)1. Do not give a considerable shock to the traverse unit(optical pickup)as it has an extremely high-precise structure.2. When replacing the optical pickup, install the flexible cable and cut is short land with a n

18、ipper. See the optical pickup replacement procedure in this Technical Guide. Before replacing the traverse unit, removethe short pin for preventingstatic electricity and install a new unit.Connect the connector as short times aspossible.3. The flexible cable may be cut off if an excessive force is a

19、pplied to it.Use caution when handling the cable.4. The half-fixed resistor for laser power adjustment cannot be adjusted. Do not turn the resistor.safety_3 (1577x409x2 tiff) sheet. 5.1 Optical pickup Unit Explosed View and Part List Pic (1) Materials to Pic (1) No. PARTS CODE PARTS NAME Qty 1469220

20、0 SF-HD60 1 1 1EA0311A06300 ASSY, CHASSIS, COMPLETE 1 2 1EA0M10A15500 ASSY, MOTOR, SLED 1 Or 1EA0M10A15501 ASSY, MOTOR, SLED 1 3 1EA2451A24700 HOLDER, SHAFT 3 4 1EA2511A29100 GEAR, RACK 1 5 1EA2511A29200 GEAR, DRIVE 1 6 1EA2511A29300 GEAR, MIDDLE, A 1 7 1EA2511A29400 GEAR, MIDDLE, B 1 8 1EA2744A0300

21、0 SHAFT, SLIDE 1 9 1EA2744A03100 SHAFT, SLIDE, SUB 1 10 1EA2812A15300 SPRING, COMP, TYOUSEI 3 11 1EA2812A15400 SPRING, COMP, RACK 1 21 1EA0B10B20100 ASSY, PWB 1 Or 1EA0B10B20200 ASSY, PWB 1 31 SEXEA25700- SPECIAL SCREW BIN+-M2X11 3 32 SEXEA25900- SPECIAL SCREW M1.7X2.2 2 33 SFBPN204R0SE- SCR S-TPG P

22、AN 2X4 2 34 SFSFN266R0SE- SCR S-TPG FLT 2.6X6 1 35 SWXEA15400- SPECIAL WASHER 1.8X4 X0.25 2 Note : This parts list is not for service parts supply. 5.2 Bracket Explosed View and Part List Pic (2) Materials to Pic(2) 1.bracket 14. front silicon rubber 2.belt 15. Back silicon rubber 3.screw 16. Pick-u

23、p 4.belt wheel 17. Pick-up 5.gearwheel 18. switch 6.iron chip 19. Five-pin flat plug 7. Immobility mechanism equipment 20. screw 8. Magnet 21. PCB 9. Platen 22. motor 10. Bridge bracket 23. Motor wheel 11. screw 24. screw 12. screw 25.tray 13. Big bracket Before going process with disassembly and in

24、stallation, please carefully both peruse the chart and confirm the materials. 5.3 MISCELLANEOUS5.3.1 Protection of the LD(Laser diode) Short the parts of LD circuit pattern by soldering.5.3.2 Cautions on assembly and adjustment Make sure that the workbenches,jigs,tips,tips of soldering irons and mea

25、suring instruments are grounded,and that personnel wear wrist straps for ground. Open the LD short lands quickly with a soldering iron after a circuit is connected. Keep the power source of the pick-up protected from internal and external sources of electrical noise. Refrain from operation and stora

26、ge in atmospheres containing corrosive gases (such as H2S,SO2,NO2 and Cl2)or toxic gases or in locations containing substances(especially from the organic silicon,cyan,formalin and phenol groups)which emit toxic gases.It is particularly important to ensure that none of the above substances are prese

27、nt inside the unit.Otherwise,the motor may no longer run.6.1. Video Output (Luminance Signal) Confirmation DO this confirmation after replacing a P.C.B.Purpose:To maintain video signal output compatibility.1.Connect the oscilloscope to the video output terminal and terminate at 75 ohms.2.Confirm tha

28、t luminance signal(Y+S)level is 1000mVp-p30mVMeasurement point Video output terminalColor bar 75%PLAY(Title 46):DVDT-S15PLAY(Title 12):DVDT-S01DVDT-S15orDVDT-S01ModeDiscMeasuring equipment,tools200mV/dir,10sec/dir1000mVp-p30mVConfirmation value Do the confirmation after replacing P.C.B.Purpose:To ma

29、intain video signal output compatibility.1.Connect the oscilloscope to the video output terminal and terminate at 75 ohme.2.Confirm that the chrominance signal(C)level is 621 mVp-p30mVMeasurement point Video output terminalColor bar 75%PLAY(Title 46):DVDT-S15PLAY(Title 12):DVDT-S01DVDT-S15orDVDT-S01

30、ModeDiscMeasuring equipment,toolsConfirmation valueScrewdriver,Oscilloscope200mV/dir,10sec/dir621mVp-p30mV MT1336 PRELIMINARY, SUBJECT TO CHANGE WITHOUT NOTICE GENERAL DESCRIPTION MT1336 is a high performance CMOS analog front -end IC for both CD_ROM driver up to 48XS and DVD-ROM driver up to 16XS.

31、It also supports DVD-RAM read up to 4XS Version 2. It contains servo amplifiers to generate focusing error, 3-beam tracking error, 1 beam radial push-pull signal, RF level and SBAD for servo functions. It also includes DPD tracking error signal for DVD_ROM application. For DVD-RAM disks, there are a

32、lso Differential Push-Pull (DPP) method for generating tracking signal and Differential Astigmatic Detection (DAD) for processing focusing signal. Programmable equalizer and AGC circuits are also incorporated in this chip to optimize read channel performance. In addition, this chip has dual automati

33、c laser power control circuits for DVD-ROM (DVD-RAM) and CD -ROM seperately and reference voltage generators to reduce external components. Programmable functions are implemented by the access of internal register through bi -directional serial port to configure modes selection. FEATURES ?RF equaliz

34、er with programmable cf from 3MHz to 70 MHz and programmable boost from 3dB to 13dB. ?MT1336 supports at least eight different kinds of pick-up heads with versatile input configuration for both RF input stages and servo signal blocks. ?Versatile on- line AGC. ?3 beams tracking error signal generator

35、 for CD_ROM application. ?One beam differential phase tracking error (DPD) generator for DVD_ROM application. ?Differential push pull tracki ng error (DPP) generator for DVD_RAM application. ?Focusing error signal generator for CD- ROM, DVD- ROM and DVD- RAM (DAD method). ?RF level signal generator.

36、 ?Sub- beam added signal for 3 beams CD_ROM. ?One beam push- pull signal generator for central servo application. ?High speed RF envelop detection circuit with bandwidth up to 400KHz for CD- ROM. ?Defect and Blank detection circuits. ?Dual automatic laser power control circuits with programmable lev

37、el of LD monitor voltage. ?Vref=1.4V voltage and V2ref=2.8V voltage generators. ?V20=2.0V voltage for pick- up head reference. ?Bi- directional serial port to access internal registers. MT1336 PRELIMINARY, SUBJECT TO CHANGE WITHOUT NOTICE MT1336 FUNCTION BLOCKS DIAGRAM DVDADEFECTTEOFEOMDI2LDO2DPDREF

38、 and 2VREFVoltage GeneratorV2REFOLVLVGAENVELOPDETECTORAGCRFGCULRFRPINPUT MUXREF and 2VREFVoltage GeneratorVGAEQENVELOPDETECTORAGCCDADVDBCDBDVDCCDCDVDDCDDDVDRFINDVDRFIPTPITNIRFOPSBADTERFLEVEL FEDVDAPCMDI1LDO1CD APCVREFOSLCKSDENSERIALPORTDPFNDPFOIRDPDMUTECRTPOSPOSNRFONCRTPLPRFGCMACENTRALSERVORFGCIAGC3

39、AGC1AGC2CSOHALLSINSINPHIHRFRPMBMCMDCDFOPCDFONSASBSCSDV20RFSUBOWOBBLEDETWOBSOCOSPHIREFSINREFCOSHALLCOSPCSUDGATEIDGATEVFO13SDATA MT1336 PRELIMINARY, SUBJECT TO CHANGE WITHOUT NOTICE MT1336 PIN ASSIGNMENT DPDMUTEA G N D PA G N D XA V D D PV C O NS AS BM CM DD V D BD V D AD V D R F I PD V D CD V D D9 59

40、 49 39 29 19 08 98 88 78 68 58 48 38 28 18 07 97 87 77 67 57 47 37 27 17 06 96 86 76 66 51 0 11 0 09 99 89 79 61 0 2MT1336DVD-ROMWithDVD_RAMReadA V D D OR F O PR F O NA G N D OT M 1T M 2T M 3A G N D TT M 4A V D D TI O 4S C L KA G N D XS W 1S W OG N D SC D BC D AD V D R F I NA G N D FM O NV F O 1 3A

41、G N D XA G N D XT R L P AT R L PH T R CG N D PD P F ND P F OI O 1A G N D XV D DI O 5I O 7I O 8I O 9F E OI O BS W 2I O A1234567891 01 11 21 31 51 61 71 81 92 02 12 22 32 42 62 72 82 93 03 13 23 33 43 53 73 81 42 53 6I O 0A V D D FI O 6A G N D XA V D D MH A L L C O SC O S P H IR E F C O SA G N D MH A

42、L L S I NU D G A T EH D G A T E3 94 04 14 24 34 54 64 74 95 05 15 25 45 35 55 65 75 85 96 06 16 26 36 44 44 8I RA V D DS CS DW G N DL D O 2M D I 2M D I 1C D F O PS V D DT P IT N IS G N DR F S U B OW O B S OW V D DL D O 1W A V D DA G C 1A G C 2A G C 3W A G N D1 2 11 2 01 1 91 1 81 1 71 1 61 1 51 1 41

43、 1 31 1 21 1 11 1 01 0 91 0 81 0 71 0 61 0 51 0 41 0 31 2 71 2 61 2 51 2 41 2 31 2 21 2 8A G N DR S TS D A T AS D E NV 2 R E F OL R F R PH R F R PC R T PC R T P L PD E F E C TV D D PT E OC S OV R E F OV 2 0L V LV D D SM BR F G CR F G C UR F G C IC E Q PC E Q NA G N D XX C K 1 6 MI O 3G N DR E F S I

44、NM O PC D CC D DM AO S NO S PI O 2C D F O NS I N P H IA G N D XA G N D X MT1336 PRELIMINARY, SUBJECT TO CHANGE WITHOUT NOTICE MT1336 PIN DESCRIPTIONS Pin Numbers Symbol Type Description LQFP128 RF Flag Interface 23 DEFECT Digital Output Flag of bad data output status RF SIO interface 56 SCLK Digital

45、 Input RF serial clock input 58 SDEN Digital Input RF serial data enable 59 SDATA Digital IO RF serial data IO 60 RST Digital input Reset (active high) 55 XCK16M Digital Input 16.9MHz for verification RF SERVO interface 40 UDGATE Digital Input Control signal for DVD-RAM 41 IDGATE Digital Input Contr

46、ol signal for DVD-RAM 38 VFO13 Digital Input DVD -RAM Header signal RF 100 DVDA Analog input AC coupled DVD RF signal input A 99 DVDB Analog Input AC coupled DVD RF signal input B 98 DVDC Analog Input AC coupled DVD RF signal input C 97 DVDD Analog Input AC coupled DVD RF signal input D 95 DVDRFIN A

47、nalog Input AC coupled DVD RF signal input RFIN 96 DVDRFIP Analog Input AC coupled DVD RF signal input RFIP 94 CDA Analog Input AC coupled CD RF signal input A 93 CDB Analog Input AC coupled CD RF signal input B 92 CDC Analog Input AC coupled CD RF signal input C 91 CDD Analog Input AC coupled CD RF

48、 signal input D 90 OSN Analog RF Offset cancellation capacitor connecting 89 OSP Analog RF Offset cancellation capacitor connecting 85 CEQP Analog RF Offset cancellation capacitor connecting 84 CEQN Analog RF Offset cancellation capacitor connecting 88 RFGC Analog RF AGC loop capacitor connecting fo

49、r DVD - ROM MT1336 PRELIMINARY, SUBJECT TO CHANGE WITHOUT NOTICE 87 RFGCU Analog RF AGC loop capacitor connecting for DVD - RAM 86 RFGCI Analog RF AGC loop capacitor connecting for DVD - RAM 101 MA Analog Input DC coupled DVD-RAM main-beam RF signal input A 102 MB Analog Input DC coupled DVD-RAM mai

50、n-beam RF signal input B 103 MC Analog Input DC coupled DVD-RAM main-beam RF signal input C 104 MD Analog Input DC coupled DVD-RAM main-beam RF signal input D 105 SA Analog Input DC coupled DVD-RAM sub-beam RF signal input A 106 SB Analog Input DC coupled DVD-RAM sub-beam RF signal input B 110 SC An