Mitsubishi-DD6000-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: 5C to 35COperation status:HorizontalVideo output:1.0 V (p-p), 75, negativesync., pin jack x 1S Video output:(Y

2、) 1.0 V (p-p), 75, nega-tive sync., Mini DIN 4-pin x 1(C) 0.286 V (p-p), 75Color Difference outputs: (Y) 1.0 V (p-p), 75,(1 Interlaced)negative sync., pin jack x 1(1 Progressive)(Cr, Pr)/(Cb, Pb) 0.7 V (p-p),75, pin jack x 2Digital Audio output:(Bitstream/PCM) 0.5 V (p-p),75, pin jack x 1,Optical co

3、nnector x 1Analog Audio output:2.0 V (rms), 220, 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

4、:6.8 lb.External Dimensions:17x 3-1/4x12-1/4(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 Dy

5、namic Range: More than 106 dB (EIAJ)Harmonic Distortion:Less than 0.001%Wow and flutter:Below measurable level(less than 0.001%(W.PEAK) (EIAJ)?2000MITSUBISH ELECTRICModelDD-6000DVD PlayerOPEN/CLOSESTOPPLAYPAUSE/STEPPOWERDD-6000STANDBYSKIPREVFWD/ /CDVDTITLETRK CHPTOTAL REMAINMEMORYHDCDThis service ma

6、nual contains the differences between models DD-5000 and DD-6000.It also includes information for the DD-6000 that is identical to the DD-5000.RadioFans.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 th

7、is check). Use anAC voltmeter, having 5000 per volt or more sensitivity.Connect 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, met

8、al overlays, control shafts, etc.).Measure the AC voltage across the 1500 resistor.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,

9、 the fault must be located and corrected.Repeat the above test with the DVD 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 ear

10、th groundsuch as a water pipe,conduit, etc.1500 ?10 W0.15 F 150V ACAC OUTLETTest all exposed metal.Voltmeter Hook-up for Leakage Current CheckRadioFans.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 r

11、ecceived.The lightning flash with arrowhead symbol, within anequilateral triangle, is intended to alert the user to thepresence of uninsulated “dangerous voltage” within theproducts enclosure that may be of sufficient magnitude toconstitute a risk of electric shock to persons.The exclamation point w

12、ithin an equilateral triangle isintended to alert the user to the presence of importantoperating and maintenance (servicing) instructions in theliterature accompanying the appliance.SAFETY NOTICESECTION 2PART REPLACEMENT AND ADJUSTMENT PROCEDURESSECTION 3SERVICING DIAGRAMS1. CIRCUIT SYMBOLS ANDSUPPL

13、EMENTARY EXPLANATION1-1. Precautions for Part Replacement1-2. Solid Resistor Indication1-3. Capacitance Indication1-4. Inductor Indication1-5. Waveform and Voltage Measurement1-6. Others1-7. When Replaced ROM ICs or Upgraded Firmwareo2. PRINTED WIRING BOARD ANDSCHEMATIC DIAGRAM3. BLOCK DIAGRAMS3-1.

14、Overall Block Diagram3-2. Main Block Diagram3-2-1. Logical System Block Diagram3-3. Output Block Diagram4. CIRCUIT DIAGRAMS4-1. Output Circuit Diagram4-2. Sub Video Circuit DiagramCONTENTSSECTION 1GENERAL DESCRIPTIONSSECTION 4PARTS LISTSAFETY PRECAUTIONNOTICEABBREVIATIONS1. Integrated Circuit (IC)2.

15、 Capacitor (Cap)3. Resistor (Res)4. EXPLODED VIEWS4-1. Packing Assembly4-2. Chassis Assembly4-3. Mechanism Assembly5. PARTS LISTGeneral descriptions such as preparation for servicing, location of mechanical parts and troubleshooting are the same asmodel DD-5000.The pages from model DD-5000, Section

16、1, are included in this text.Part replacement and adjustment procedures are the same as DD-5000.The pages from model DD-5000, Section 2, are included in this text.1-1SECTION 1General Descriptions1. PREPARATION FOR SERVICINGThe Pickup Head consists of a laser diode that is very susceptible to externa

17、l static electricity.Although it may operate properly after replacement, 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 stati

18、c electricity.1MGround conductive wrist strap for body.Soldering 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 P

19、C boardFeed motor PC boardEU03 Front display PC boardLoading motor 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)TrayCl

20、amper stayLoading motorPC boardMechanism chassis1-4Fig. 1-2-4 Mechanism 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 damperR

21、ack gearassemblyGear A Gear B assemblyFront damperSub chassisRear 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 positio

22、ned at transmission initial position.Is tray closed? Pin 5 of CN502, 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 (singl

23、e-layer)/DVD dual (dual-layer)/CD?CDDVD dual (dual-layer)1Tray close 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-

24、7Pickup (P.U.) transmission initial operation does not occur.The 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(

25、start-limit switch develops H, turning off the switch.).1Does pulse 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 curren

26、t normal?Check IC502.Does search signal output at both edges of focus 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 peripher

27、al circuit of IC601.Check IC505.YYYY3NNNYNNFig. 1-3-2Fig. 1-3-31-8Disc 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 mAC

28、heck pins 14, 15 and 16 of IC501serial bus.Check peripheralcircuits 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)

29、discdetection waveformFE signalPin150 (TP504) of IC502SBAD signalPin152 (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.) forcedacc

30、elleration (500 ms)Focus searchPLAYIs forcus servo ON?CLV servo ON.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

31、 3 s.?Disc playback NG42-1546YNNYY:Automatic adjustment is carriedout 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 peripher

32、al circuitsof IC510 and IC503.Check disc motor and wiring.NYFocus 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 I

33、C502SBAD signalPin 152 (TP506)of IC5020.3V1.65V0.3VFocus searchFocus 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) o

34、f IC5021.65VRFRP signalPin 153 (TP501) of IC502Search ON (SRCH)Pin 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.

35、Check peripheral circuits of IC502 and IC601.Does pulse of L = 1.65V 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 circu

36、its of IC502 and IC601.Pin 57 of IC501 = 2.4VPin 58 of IC501 = 3.0VCheck 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 : TP

37、511 DVDPLCK 5 V/div50 ns/divDVD playback waveformCD RF signalPin 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.

38、1-3-19Fig. 1-3-18Fig. 1-3-20PLL works as a servo loop to generate 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 FSONTP5

39、08 SRCHTP501 RFRPTP506 RFSB(SBAD)TP509 VMCK(23MHz)TP503 TETP504 FETP505 VREFTP511 PLCKIC504IC501IC502IC305IC601CN602CN502CN503CN501CN801CN901CN301IC502E594 DMDRVE595 FMDRVE596 TRDRVE597 FODRV1-14This page is not printed.2-1SECTION 2PART REPLACEMENT ANDADJUSTMENT PROCEDURESCAUTIONS BEFORE STARTING SE

40、RVICINGElectronic parts are susceptible to static electricity and 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 ki

41、nds of screws are used and some of them need special cautions. That 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 MECHANI

42、CAL PARTS1-1. Cabinet Replacement1-1-1. Top Cover1. Remove five screws (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)ClawCl

43、awsSpringScrews (1)Clamperstay (2)ClawA2-21-1-3. Tray Panel1. Slide 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

44、the tray panel (4) a little in the arrow Adirection with the tray (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 t

45、he both sides of thetray (3) until clicking.OKTrayNGSpringMechanismchassis 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.

46、 2-1-2.)2. By referring to Fig. 2-1-3, insert the spring normallyand 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

47、BThe first tooth of the gear of this side on the tray rack gear.Fig. 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 pickupmechan

48、ism assembly descended. (The slider posi-tions to the left side.) The gears are required to match their phases eachother. After setting the gear (4) as shown in the figure“A”, insert the tray (3). When inserting a tray (3),push the rack gear side shown by the arrow. After inserting the tray (3), con

49、firm that the mark ofthe gear (4) matches with that of the rack gear on thetray (first tooth of the gear). (Refer to Fig. B.)Fig. 2-1-71-1-5. Rear Panel1. Remove three screws (1) and remove the rear panel (2).Fig. 2-1-8Tray (3)ClawClawFlexible cable (1)ClawsFront panel (2)ABTray panel (4)Tray (3)Tra

50、y (3)ClawsTray panel (4)Screw (1)Rear panel (2)2-41-2-2. Output PC Board1. Remove the rear panel. (Refer to item 1-1-42. Peel off the tape (1).3. Remove the connector (2).4. Disconnect two flexible cables (3).5Remove the wire part of the connector (5) from thebinding band (4).6. Remove three screws