Mitsubishi-DD5000-dvd-sm 维修电路原理图.pdf

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1、MITSUBISHI DIGITAL ELECTRONICS AMERICA, INC.9351 Jeronimo Rd. Irvine, CA 92618Copyright 2000 Mitsubishi Digital Electronics America, Inc.All Rights ReservedOperating conditions:Temperature: 5 C to 35COperation status:HorizontalVideo output:1.0 V (p-p), 75, negativesync., pin jack x 1S Video output:(

2、Y) 1.0 V (p-p), 75, nega-tive sync., Mini DIN 4-pin x 1(C) 0.286 V (p-p), 75Color Difference output:(Y) 1.0 V (p-p), 75, nega-tive sync., pin jack x 1(Cr)/(Cb) 0.7 V (p-p), 75, pinjack x 2Digital Audio output:(Bitstream/PCM) 0.5 V (p-p),75, pin jack x 1,Optical connector x 1Analog Audio output:2.0 V

3、 (rms), 330, pin jack2 CH L R x 2,5.1 CH SURROUND x 6CAUTIONBefore servicing this chassis, it is important that the service person reads all SAFETY PRECAUTIONS and theSAFETY NOTICE in this manual.SPECIFICATIONSPower Supply:120V AC, 60 HzPower Consumption:19WWeight:6.7 lb.External Dimensions:17x 3-1/

4、4x12-1/4(W/H/D)Signal System:Standard NTSCLaser:Semiconductor laser,wavelength 650 nmFrequency Range:(Digital Audio)Audio CD:4 Hz to 20 kHzDVD Linear -48 kHZ Sampling: 4 Hz to 22 kHz96 kHZ Sampling: 4 Hz to 44 kHzSignal-To-Noise Ratio: More than 112 dB (EIAJ)Audio Dynamic Range: More than 106 dB (EI

5、AJ)Harmonic Distortion:Less than 0.001%Wow and flutter:Below measurable level(less than 0.001%(W.PEAK) (EIAJ)SerSerSerSerServiceviceviceviceviceManualManualManualManualManual2000MITSUBISH ELECTRICModelDD-5000DVD PlayerOPEN/CLOSESTOPPLAYPAUSE/STEPPOWERDD-5000STANDBYSKIPREVFWD/ /CDVDTITLE TRKCHPTOTALR

6、EMAINMEMORYHDCDRadioFans.CN 收音机爱 好者资料库LASER BEAM CAUTION LABELWhen the power supply is on, do not remove this laser caution label. If it is removed, laser radiation may be recceived.The lightning flash with arrowhead symbol, within anequilateral triangle, is intended to alert the user to thepresence

7、 of uninsulated “dangerous voltage” within theproducts enclosure that may be of sufficient magnitude toconstitute a risk of electric shock to persons.The exclamation point within an equilateral triangle isintended to alert the user to the presence of importantoperating and maintenance (servicing) in

8、structions in theliterature accompanying the appliance.SAFETY NOTICERadioFans.CN 收音机爱 好者资料库SAFETY PRECAUTIONSLEAKAGE CURRENT CHECKPlug the AC line cord directly into a 120V AC outlet (donot use an isolation transformer for this check). Use anAC voltmeter, having 5000 per volt or more sensitivity.Con

9、nect a 1500 10 W resistor, paralleled by a 0.15 F150V AC capacitor between a known good earth ground(water pipe, conduit, etc.) and all exposed metal parts ofthe cabinet (antennas, handle bracket, metal cabinetscrewheads, metal overlays, control shafts, etc.).Measure the AC voltage across the 1500 r

10、esistor.The test must be conducted with the AC switch on andthen repeated with the AC switch off. The AC voltageindicated by the meter may not exceed 0.3 V. A readingexceeding 0.3 V indicates that a dangerous potentialexists, the fault must be located and corrected.Repeat the above test with the DVD

11、 VIDEO PLAYERpower plug reversed.NEVER RETURN A DVD VIDEO PLAYER TO THECUSTOMER WITHOUT TAKING NECESSARYCORRECTIVE ACTION.READING SHOULD NOT EXCEED 0.3VDVD VIDEO PLAYERAC VOLTMETER(5000 ? per volt or more sensitivity)Good earth groundsuch as a water pipe,conduit, etc.1500 ?10 W0.15 F 150V ACAC OUTLE

12、TTest all exposed metal.Voltmeter Hook-up for Leakage Current CheckSECTION 2PART REPLACEMENT AND ADJUSTMENT PROCEDURESSECTION 3SERVICING DIAGRAMS1. STANDING PC BOARDS FOR SERVICING .3-12. CIRCUIT SYMBOLS ANDSUPPLEMENTARY EXPLANATION.3-22-1. Precautions for Part Replacement .3-22-2. Solid Resistor In

13、dication .3-22-3. Capacitance Indication.3-22-4. Inductor Indication .3-32-5. Waveform and Voltage Measurement.3-32-6. When Replaced ROM ICs or Upgraded Firmware .3-43. PRINTED WIRING BOARD ANDSCHEMATIC DIAGRAM.3-54. BLOCK DIAGRAMS.3-74-1. Overall Block Diagram .3-74-2. Power Supply Block Diagram .3

14、-94-3. Front Display, Power Switch Block Diagram .3-104-4. Main Block Diagrams.3-134-5. Output Block Diagram .3-175. CIRCUIT DIAGRAMS .3-185-1. Power Supply Circuit Diagram .3-185-2. Front Display, Power Switch Circuit Diagram.3-215-3. Main Circuit Diagram .3-245-4. Output Circuit Diagram.3-415-5. M

15、otor System Circuit Diagrams .3-476. PC BOARDS .3-496-1. Power Supply PC Board.3-496-2. Main PC Board .3-506-3. Output PC Board .3-55CONTENTSSECTION 1GENERAL DESCRIPTIONS1. PREPARATION FOR SERVICING .1-12. LOCATION OF MAIN PARTS ANDMECHANISM PARTS .1-22-1. Location of Main Parts.1-22-2. Location of

16、Mechanism Parts .1-31. REPLACEMENT OF MECHANICAL PARTS .2-11-1. Cabinet Replacement.2-11-1-1. Top Cover .2-11-1-2. Clamper Stay.2-11-1-3. Tray Panel .2-21-1-4. Front Panel and Tray .2-31-1-5. Rear Panel .2-31-2. PC Board Replacement .2-41-2-1. Main PC Board .2-41-2-2. Output PC Board .2-41-2-3. Powe

17、r PC board .2-51-2-4. Front PC Board.2-51-3. Mechanism Parts.2-61-3-1. Mechanism Chassis Assembly .2-61-3-2. Loading Belt .2-61-3-3. Loading Motor .2-71-3-4. Sub Chassis (with a pickup mechanism) .2-71-3-5. Pickup Mechanism Assembly .2-81-3-6. Gear A Assembly, Gear B andRack Gear Assembly .2-81-3-7.

18、 Feed Motor .2-93. TROUBLESHOOTING. 1-63-1. Main Circuit .1-63-1-1. Servo System .1-63-1-2. Location Diagram of Servo Test Point .1-13SECTION 4PARTS LISTSAFETY PRECAUTION .4-1NOTICE .4-1ABBREVIATIONS .4-11. Integrated Circuit (IC).4-12. Capacitor (Cap) .4-13. Resistor (Res) .4-14. EXPLODED VIEWS.4-2

19、4-1. Packing Assembly .4-24-2. Chassis Assembly .4-34-3. Mechanism Assembly .4-45. PARTS LIST .4-51-1SECTION 1General Descriptions1. PREPARATION FOR SERVICINGThe Pickup Head consists of a laser diode that is very susceptible to external static electricity.Although it may operate properly after repla

20、cement, if subjected to electrostatic discharge during replacement, itslife may be shortened. When replacing the laser diode, LSIs and ICs, use a conductive mat, soldering iron withground wire, etc. to protect against damage from static electricity.1MGround conductive wrist strap for body.Soldering

21、iron with ground wire or ceramic typeConductive matThe ground resistancebetween the ground line and the ground is less than 10.Fig. 1-1-11-22. LOCATION OF MAIN PARTS AND MECHANISM PARTS2-1. Location of Main PartsFig. 1-2-1EU05 Output PC boardFeed motor PC boardEU03 Front display PC boardLoading moto

22、r PC boardDisc motor PC boardEU04 Power SW PC boardEU01 Main PC boardEU02 Power supply PC board1-32-2. Location of Mechanism PartsFig. 1-2-2 Mechanism chassis assembly (Top side)Fig. 1-2-3 Mechanism chassis assembly (Bottom side)TrayClamper stayLoading motorPC boardMechanism chassis1-4Fig. 1-2-4 Mec

23、hanism chassis assembly (Internal side)Loading beltLoading motorKick leverCam SliderGearGearGearDisc motor1-5Fig. 1-2-5 Pickup mechanism chassis assembly (Top side)Fig. 1-2-6 Pickup mechanism chassis assembly (Bottom side)Front damperRack gearassemblyGear A Gear B assemblyFront damperSub chassisRear

24、 damperPickup assemblyRear damperFeed motorFeed motorPC board1-63. TROUBLESHOOTING3-1. Main Circuit3-1-1. Servo System(1) Initial Operation after Power ONPower ONSend each LSI hard RST command and initial command.Pickup head is positioned at transmission initial position.Is tray closed? Pin 5 of CN5

25、02, TCLS=LDisc presence/absence and disc judgementIs a disc present?DVD or CD initial setting.DVD singleInitial setting.DVD dual Initial setting.CDInitial setting.To each disc playback process.DVD single (single-layer)DVD single (single-layer)/DVD dual (dual-layer)/CD?CDDVD dual (dual-layer)1Tray cl

26、ose operationPin 6 of IC601: LDMP = H/LPin 7 of IC601: LDMN = LIs tray closed?Pin 5 of CN502: TCLS = LYNTray stops.Pin 6 of IC601: LDMP = HPin 7 of IC601: LDMN = LLaser OFFDisplay: INSERT DISCMonitor screen: NO DISCYYNGNN2Fig. 1-3-1H1-7Pickup (P.U.) transmission initial operation does not occur.The

27、pickup transmission initial operation is carried out todetermine the initial position by transmitting the pickup to theinnermost position once (start-limit switch (pin 4 of CN503)develops L.) and to the external direction at low speed(start-limit switch develops H, turning off the switch.).1Does pul

28、se of 1.65V 1.65V develop at pin 162 of IC502?Check BUS between IC502 and IC601 and oscillation.Check feed gear.NY2-1No disc misjudgement display ofdisc presence.Does lens move withUP/DOWN full stroke in focus direction?Is laser current normal?Check IC502.Does search signal output at both edges of f

29、ocus coil? (Pins 10 to 13 of CN501)Does focus searchvoltage of 1.65V 0.4V developat pin 1 of IC504 (E597)?Check pickup head and wiring.Does SBAD signal develop more than 0.3V?Check IC501.Lens cleaning.Replace pickup head.Check peripheral circuit of IC601.Check IC505.YYYY3NNNYNNFig. 1-3-2Fig. 1-3-31-

30、8Disc kind misjudgement (Initial setting is NG.)Replace pickup head.Lens cleaning.Check IC501.Are FE and SBAD signals for each disc normal?Check peripheral circuit of IC601.2-2YNCheck laser current.Check laser current. 50 mA lop 90 mACheck pins 14, 15 and 16 of IC501serial bus.Check peripheralcircui

31、ts of IC501,Q501 and Q502.lop = Voltage between E522 and E523/3.3Replace pickup mechanism.Check wiring for pickup head.Check peripheral circuits of IC501, Q501 and Q502.lop 90 mAlop 50 mA3YFig. 1-3-4Fig. 1-3-5DVD single (single-layer) discdetection waveformFE signalPin150 (TP504) of IC502SBAD signal

32、Pin152 (TP506) of IC5021.65VV : 500 mV/divH : 2 ms/divDVD dual (dual-layer) discdetection waveformV : 500 mV/divH : 2 ms/divCD discdetection waveformV : 500 mV/divH : 2 ms/divFig. 1-3-6Fig. 1-3-7Fig. 1-3-81-9Disc motor (D.M.) forcedaccelleration (500 ms)Focus searchPLAYIs forcus servo ON?CLV servo O

33、N.Tracking balance adjustmentTracking servo ON.Focus gain adjustmentTracking gain adjustmentFocus balance adjustmentRF gain adjustmentRepeat three times.Is address code possible to read?Search Picture appears.Does NG continue more than 3 s.?Disc playback NG42-1546YNNYY:Automatic adjustment is carrie

34、dout when a disc is replaced afterpower ON.NNNYYNNYYFig. 1-3-9(2) Picture appears (PLAY)1-104Disc motor (D.M.) does not rotate.Does pin 117 of IC502 (TP511) PLCK oscillate around 10 MHz ?Check peripheral circuit of IC503.Check peripheral circuitsof IC510 and IC503.Check disc motor and wiring.NYFocus

35、 servo is NG.Are FE, SBAD, FSON signals normal?Check peripheral circuit of IC601.Do signals output to pins 4 to 9 of CN501?Check IC501.Check wiring forpickup head.Lens cleaning.Replace pickup mechanism.YYNN5FE signalPin 150 (TP504)of IC502SBAD signalPin 152 (TP506)of IC5020.3V1.65V0.3VFocus searchFo

36、cus servo onFocus servo ONsignal waveformFig. 1-3-10Fig. 1-3-11Fig. 1-3-121-11Tracking servo is NG.Is TE signal normal?Check peripheral circuit of IC601.Check IC501.6YNSignal waveform at tracking servo ON (CD)TE signalPin 151 (TP503) of IC5021.65VRFRP signalPin 153 (TP501) of IC502Search ON (SRCH)Pi

37、n 38 (TP508) of IC502ON searchTracking servo onSignal waveform at tracking servo ON (DVD)Fig. 1-3-13Fig. 1-3-14Fig. 1-3-151-12Disc playback is NG (DVD).Is PLL locked? (Refer to waveforms.)Check signal process system following to IC503.Check peripheral circuits of IC502 and IC601.Does pulse of L = 1.

38、65V and H = 3.3V develop at pin 131 andL = 0V and H = 1.65Vdevelop at pin 132of IC502? Does RF outputhigher than 1.5 V(p-p) develop at pin 45 (TP515)of IC501 ?Check IC501.Lens cleaning.Pickup mechanism replacementCheck peripheral circuits of IC502 and IC601.Pin 57 of IC501 = 2.4VPin 58 of IC501 = 3.

39、0VCheck peripheral circuits of IC501and IC502.7YNNNNYYYDVD RF signalPin 45 (TP515) of IC501V : 500 mV/divH : 50 ns/divDVD RF signalDVD RF signalPin 45 (TP515) of IC501DVD PLCKPin 117 (TP511) of IC502CH1 : TP515 DVDRF 500 mV/divCH2 : TP511 DVDPLCK 5 V/div50 ns/divDVD playback waveformCD RF signalPin

40、45 (TP515) of IC501V : 500 mV/divH : 100 ns/divCD RF signalCD RF signalPin 45 (TP515) of IC501CD PLCKPin 117 (TP511) of IC502CH1 : TP515 CDRF 500 mV/divCH2 : TP511 CDPLCK 5 V/div100 ns/divCD playback waveformFig. 1-3-16Fig. 1-3-17Fig. 1-3-19Fig. 1-3-18Fig. 1-3-20PLL works as a servo loop to generate

41、 a clock signal for readingRF signal binary data. With the PLL locked, the eye pattern isidentified clearly when triggered with the read clock PLCK.1-13Fig. 1-3-213-1-2. Location Diagram of Servo Test PointE523E522TP515 RFTP507 FSONTP508 SRCHTP501 RFRPTP506 RFSB(SBAD)TP509 VMCK(23MHz)TP503 TETP504 F

42、ETP505 VREFTP511 PLCKIC504IC501IC502IC305IC601CN602CN502CN503CN501CN801CN901CN301IC502E594 DMDRVE595 FMDRVE596 TRDRVE597 FODRV1-14This page is not printed.2-1SECTION 2PART REPLACEMENT ANDADJUSTMENT PROCEDURESCAUTIONS BEFORE STARTING SERVICINGElectronic parts are susceptible to static electricity and

43、 may easily damaged, so do not forget to take a proper ground-ing treatment as required.Many screws are used inside the unit. To prevent missing, dropping, etc. of the screws, always use a magnetizedscrewdriver in servicing. Several kinds of screws are used and some of them need special cautions. Th

44、at is, take careof the tapping screws securing molded parts and fine pitch screws used to secure metal parts. If they are used improp-erly, the screw holes will be easily damaged and the parts can not be fixed.1. REPLACEMENT OF MECHANICAL PARTS1-1. Cabinet Replacement1-1-1. Top Cover1. Remove five s

45、crews (1) and remove the top cover (2).Fig. 2-1-11-1-2. Clamper Stay1. Remove two screws (1).2. Release two claws and remove the clamper stay (2).Fig. 2-1-2Screw (1)Screw (1)Top cover (2)Screws (1)Clamper stay (2)Clamper stay (2)ClawClawsSpringScrews (1)Clamperstay (2)ClawA2-21-1-3. Tray Panel1. Sli

46、de the slider (2) of the mechanism chassis assem-bly (1) with a screwdriver, etc. in the arrow direction,so that the tray (3) is ejected.Note: Take care not to damage the pickup and other parts.Fig. 2-1-41. Eject the tray (3).2. Twist the tray panel (4) a little in the arrow Adirection with the tray

47、 (3) hold by hand to releasetwo claws and lift up the tray panel (4) in the arrow Bdirection, then the tray panel (4) is removed.(Refer to Fig. 2-1-5.)3. When mounting the tray panel (4), insert the traypanel (4) along the grooves of the both sides of thetray (3) until clicking.OKTrayNGSpringMechani

48、smchassis assemblyNGThis part should be touchto the left side of the tray.OKNGPress down by fingerunitil fix the clamper assemblyNo floatingFloating NG1. The spring for tray side pressure is inserted into theportion “A”. (Refer to Fig. 2-1-2.)2. By referring to Fig. 2-1-3, insert the spring normally

49、and mount the clamper stay.Fig. 2-1-3ScrewdriverMechanismchassis assembly (1)Tray (3)Front panelSlider (2)2-3SliderPickup mechanismassemblyTray (3)Gear (4)Gear (4)Gear (4)MarkingRack gearTriangle markPosition of the lineFigure AFigure BThe first tooth of the gear of this side on the tray rack gear.F

50、ig. 2-1-51-1-4. Front Panel and Tray1. Remove the flexible cable (1).2. Release four claws and remove the front panel (2).3. Pull out the tray (3) to this side.Fig. 2-1-6Note: Insert the tray (3) with the front side of the pickupmechanism assembly descended. (The slider posi-tions to the left side.)