Mitsubishi-DD8030-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 2002 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), 75Component Video output:(Y) 1.0 V (p-p), 75,negative sync., pin jack x 1(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 connector x 1Analog Audio output:2

3、.0 V (rms), 680, 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:17WWeight:5.6 lb.External Dimensions:17x

4、2-3/4x8-7/8(W/H/D)Signal System:Standard NTSCLaser:Semiconductor laser,wavelength 650nm/780nmFrequency Range:(Digital Audio)DVD 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 108 dB (EIAJ)Harmonic Distor

5、tion:Less than 0.002%Wow and flutter:Below measurable level(less than 0.001%(W.PEAK) (EIAJ)ServiceManual2002MITSUBISH ELECTRICModelDD-8030DVD PlayerRadioFans.CN 收音机爱 好者资料库SECTION 1GENERAL DESCRIPTIONSSECTION 1GENERAL DESCRIPTIONS1MGround conductive wrist strap for body.Soldering iron with ground wir

6、e or ceramic typeConductive matThe ground resistancebetween the ground line and the ground is less than 10.The Pickup Head consists of a laser diode that is very susceptible to external static electricity.Although it may operate properly after replacement, if subjected to electrostatic discharge dur

7、ing replacement,its life might be shortened. When replacing the laser diode, LSIs and ICs, use a conductive mat, soldering ironwith ground wire, etc. to protect against damage from static electricity.1. PREPARATION FOR SERVICINGGENERAL DESCRIPTIONS1-1RadioFans.CN 收音机爱 好者资料库2. LOCATION OF MAIN PARTS

8、AND MECHANISM PARTS2-1. Location of Main PartsFig. 1-2-1EU01 Main PC boardEU05 Output PC boardEU02 Power supply PC boardEU04 Power SW PC boardLoading motor PC boardDisc motor PC boardFeed motor PC boardEU03 Front display PC board2-2. Location of Mechanism Parts2-2-1. Type AFig. 1-2-2 Mechanism chass

9、is assembly (Top side)Fig. 1-2-3 Mechanism chassis assembly (Bottom side)TrayClamper stayLoading motorPC boardMechanism chassisFig. 1-2-4 Mechanism chassis assembly (Internal side)Loading beltLoading motorCam SliderGearGearGearClamperFig. 1-2-5 Pickup mechanism chassis assembly (Top side)Fig. 1-2-6

10、Pickup mechanism chassis assembly (Bottom side)Rack gearassemblyGear A Gear B assemblySub chassisPickup assemblyDisc motorFeed motorFeed motorPC boardFront damperFront damperRear damperRear damper2-2-2. Type BFig. 1-2-7 Mechanism chassis assembly (Top side)Fig. 1-2-8 Mechanism chassis assembly (Bott

11、om side)TrayClamper stayLoading motorPC boardMechanism chassisFig. 1-2-9 Mechanism chassis assembly (Internal side)Loading beltLoading motorKick leverCam SliderGearGearGearDisc motorFig. 1-2-10 Pickup mechanism chassis assembly (Top side)Front damperRack gearassemblyGear A Gear B assemblyFront dampe

12、rSub chassisRear damperPickup assemblyRear damperFeed motorFeed motorPC boardFig. 1-2-11 Pickup mechanism chassis assembly (Bottom side)3. 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

13、positioned 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

14、 (single-layer)/DVD dual (dual-layer)/CD?CDDVD dual (dual-layer)1Tray close operationPin C9 of IC306 (E537): LDMP = H/LPin Y19 of IC306 (E538): LDMN = LIs tray closed?Pin 5 of CN502: TCLS = LYNTray stops.Pin C9 of IC306 : LDMP = HPin Y19 of IC306 : LDMN = LLaser OFFDisplay: INSERT DISCMonitor screen

15、: NO DISCYYNGNN2Fig. 1-3-1Pickup (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 externa

16、l direction at low speed(start-limit switch develops H, turning off the switch.).1Does pulse of 1.65V 1.65V develop at pin 162 of IC401?Check BUS between IC401-IC306 and oscillation.Check feed gear.NY2-1No disc misjudgement display ofdisc presence.Does lens move withUP/DOWN full stroke in focus dire

17、ction?Is laser current normal?Check IC401.Does search signal output at both edges of focus coil? (Pins 15 to 18 of CN501)Does focus searchvoltage of 1.65V 0.4V developat pin 23 of IC503 (E544)?Check pickup head and wiring.Does RFSB signal develop more than 0.3V?Check IC502.Lens cleaning.Replace pick

18、up head.Check peripheral circuit of IC605.Check IC503.YYYY3NNNYNNFig. 1-3-2Fig. 1-3-3Disc kind misjudgement (Initial setting is NG.)Replace pickup head.Lens cleaning.Check IC502.Are FE and RFSB signals for each disc normal?Check peripheral circuit of IC605.2-2YN? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?

19、? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?Fig. 1-3-4Fig. 1-3-5? ? ? ? ? ? ? ? ? ? ? ? ?

20、 ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?Fig. 1-3-6Fig. 1-3-7Fig. 1-3-8? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?Fig. 1-3-9(2) Picture appears (PLAY)? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?Focus servo is NG.Are FE, RFSB, FSON signals normal?

21、Check peripheral circuit of IC306.Do signals output to pins 9 to 14 of CN501?Check IC502.Check wiring forpickup head.Lens cleaning.Replace pickup mechanism.YYNN5? ? ? ? ? ? ? ? ? ? ? ? ? ? ?Fig. 1-3-10Fig. 1-3-11Fig. 1-3-12Tracking servo is NG.Is TE signal normal?Check peripheral circuit of IC306.Ch

22、eck IC502.6YN? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?Fig. 1-3-13Fig. 1-3-14Fig. 1-3-15DVD RF signalPin 30 (TP502) of IC502V : 500 mV/divH : 50 ns/divDVD RF signal? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?CD RF signalPin 30 (TP502) of IC502V : 500 mV/divH : 100 ns/divCD RF sig

23、nalCD RF signalPin 30 (TP502) of IC502CD PLCKPin 117 (TP409) of IC401CH1 : TP502 CDRF 500 mV/divCH2 : TP409 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 a clock signal for reading RFsignal binary data. With t

24、he PLL locked, the eye pattern is identifiedclearly when triggered with the read clock PLCK.Disc playback is NG (DVD).Is PLL locked? (Refer to waveforms.)Check signal process system following to IC402.Check peripheral circuits of IC401 and IC306.Does pulse of L = 1.65V and H = 3.3V develop at pin 13

25、1 andL = 0V and H = 1.65Vdevelop at pin 132of IC401? Does RF outputhigher than 1 V(p-p) develop at pin 30 (TP502)of IC502?Check IC502.Lens cleaning.Pickup mechanism replacementCheck peripheral circuits of IC401 and IC306.Pin 43 of IC502 = 2.4VPin 44 of IC502 = 3.0VCheck peripheral circuits of IC502

26、and IC401.7YNNNNYYYFig. 1-3-213-1-2. Location Diagram of Servo Test PointCN503CN502CN603CN601CN501CN701CN901CN302IC502IC503IC401IC312IC313IC305IC306IC307IC310IC902TP410 FLGATP401 VRFEDTP408 RFRPTP406 TETP409 PLCKTP412 VMCKTP411 FLGBTP502 RFOTP405 FETP504 RFCTTP503 RFSBE559 (DVD)E536 (CD)E538 (LDMN)E

27、537 (LDMP)E534 (+5V)SECTION 2PART REPLACEMENT ANDADJUSTMENT PROCEDURESCAUTIONS BEFORE STARTING SERVICINGElectronic parts are susceptible to static electricity and may easily damaged, so do not forget to take a proper groundingtreatment as required.Many screws are used inside the unit. To prevent mis

28、sing, dropping, etc. of the screws, always use a magnetized screw-driver in servicing. Several kinds of screws are used and some of them need special cautions. That is, take care of thetapping screws securing molded parts and fine pitch screws used to secure metal parts. If they are used improperly,

29、 thescrew holes will be easily damaged and the parts can not be fixed.1. REPLACEMENT OF MECHANICAL PARTS (TYPE A)1-1. Cabinet Replacement1-1-1. Top Cover1. Remove seven screws (1), then remove the top cover(2).Fig. 2-1-11-1-2. Tray Panel1. Insert a paper clip, etc. into the hole A to eject the tray(

30、1).Fig. 2-1-2Tray (1)Front panelInsert a paper clip, etc. in this holePaper clip, etc.Hole AScrew (1)Top cover (2)Screws (1)Screw (1)Screws (2)Rear panel (3)Bush (1)1-1-4. Tray1. Pull out the tray (1) towards you until it stops.2. Lift up claw A with a minus screwdriver, and pull outthe tray (1) tow

31、ards you, then remove the tray (1).Fig. 2-1-51-1-5. Rear Panel1. Remove the bush (1).2. Remove four screws (2), then remove the rear panel(3).Fig. 2-1-6ATraypanel (2)Tray (1)Tray (1)TrayPanel (2)ClawClawBAB1. Eject the tray (1). (Refer to item 1-1-2.)2. Twist the tray panel (2) a little in the arrow

32、 A directionwith the tray (1) hold by hand to release two claws andlift up the tray panel (2) in the arrow B direction, thenthe tray panel (2) is removed.3. When mounting the tray panel (2), insert the tray panel(2) along the grooves of the both sides of the tray (1)until clicking.Frontpanel (2)Claw

33、sClawFlexible cable (1)ClawFig. 2-1-31-1-3. Front Panel1. Remove one flexible cable (1).2. Release four claws, then remove the front panel (2).Fig. 2-1-4Mechanismchassis assembly Tray (1)Pull out the tray (1)toward you.Tray (1)Minus screwdriverClaw AMinusscrewdriver1-2. PC Board Replacement1-2-1. Ma

34、in PC BoardNote: Before removing the main PC board (4), be sure toshort-circuit the laser diode output land.After replacing, open the land as it was after insertingthe flexible cables (1).1. Remove the top cover. (Refer to item 1-1-1.)2. Eject the tray. (Refer to item 1-1-2.)3. Remove six flexible c

35、ables (1) and remove oneconnector (2).4. Remove four screws (3), then remove the main PCboard (4).Fig. 2-1-71-2-2. Output PC Board1. Remove the top cover. (Refer to item 1-1-1.)2. Peel off two tapes (1) and remove the connector (2).3. Remove two flexible cables (3).4. Remove five screws (4), then re

36、move the output PCboard (5).Fig. 2-1-8? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?Screws (4)Connector (2)Flexiblecable (3)Flexiblecable (3)Screws (4)OutputPC board (5)Tapes (1)Twist more than 9 times.1-2-3. Power PC board1. Remove the bush (1).2. Peel off two tapes (2) and remove two connectors (3).3.

37、Remove four screws (4), then remove the powersupply PC board (5).Fig. 2-1-9Connector (3)Connector (3)Power supplyPC board (5)Tapes (2)Screws (4)Power bush (1)Twist more than 9 times.Power SWPC board (5)Front display PC board (3)Screws (2)Screws (6)Screws (4)Flexiblecable (1)1-2-4. Front PC Board1. R

38、emove the front panel. (Refer to item 1-1-3.)2. Remove the flexible cable (1).3. Remove nine screws (2), then remove the front displayPC board (3).4. Remove two screws (4), then remove the power switchPC board (5).5. Remove three screws (6), then remove the ENTERswitch (7).Fig. 2-1-101-3. Mechanism

39、Parts1-3-1. Mechanism Chassis AssemblyNote: When removing the mechanism chassis assembly (3),be sure to short-circuit the laser diode output landbefore removing the connector and the flexible cables.After replacing, open the land as it was after insertingthe connector and flexible cables.1. Remove t

40、he front panel. (Refer to item 1-1-3.)2. Remove three flexible cables (1).3. Remove four screws (2), then remove the mechanismchassis assembly (3).Fig. 2-1-11? ? ? ? ? ? ? ? ? ? ? ? ?2. REPLACEMENT OF MECHANICAL PARTS (TYPE B)1. The spring for tray side pressure is inserted into theportion “A”. (Ref

41、er to Fig. 2-1-13.)2. By referring to Fig. 2-1-14, insert the spring normallyand mount the clamper stay.Fig. 2-1-142-1. Cabinet Replacement2-1-1. Top Cover1. Remove seven screws (1), then remove the top cover(2).Fig. 2-1-122-1-2. Clamper Stay1. Remove two screws (1).2. Release two claws and remove t

42、he clamper stay (2).Fig. 2-1-13Screw (1)Top cover (2)Screws (1)Screw (1)Clamper stay (2)ClawSpringClamper stay (2)Screws (1)Clamperstay (2)ClawClawsAOKTrayNGSpringMechanismchassis assemblyNGThis part should be touchedto the left side of the tray.OKNGPress down by fingerunitil fix the clamper assembl

43、yNo floatingFloating NG2-1-3. Tray Panel1. Slide the slider (2) of the mechanism chassis assembly(1) with a screwdriver, etc. in the arrow direction, sothat the tray (3) is ejected.Note: Take care not to damage the pickup and other parts.Fig. 2-1-151. Eject the tray (3).2. Twist the tray panel (4) a

44、 little in the arrow A directionwith the tray (3) hold by hand to release two claws andlift up the tray panel (4) in the arrow B direction, thenthe tray panel (4) is removed. (Refer to Fig. 2-1-16.)3. When mounting the tray panel (4), insert the tray panel(4) along the grooves of the both sides of t

45、he tray (3)until clicking.Mechanismchassis assembly (1)Tray (3)Front panelScrewdriverSlider (2)Fig. 2-1-162-1-4. 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) towards you.Fig. 2-1-17Note: Insert the tray (3) with th

46、e front side of the pickupmechanism assembly descended. (The slider positionsto 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), pushthe rack gear side shown by the arrow.ATra

47、ypanel (4)Tray (3)Tray (3)TrayPanel (4)ClawClawBABFrontpanel (2)Tray (3)ClawsClawFlexible cable (1)ClawScrews (2)Rear panel (3)Bush (1) Fig. AGear (4)Triangle markPosition of the linePickup mechanismassemblyGear (4)Tray rack gearTray (3)SliderTriangle markMarkingGearFig. B2-2. PC Board Replacement2-

48、2-1. Main PC BoardNote: Before removing the main PC board (4), be sure toshort-circuit the laser diode output land.After replacing, open the land as it was after insertingthe flexible cables (1).1. Remove the top cover. (Refer to item 2-1-1.)2. Eject the tray. (Refer to item 2-1-3.)3. Remove six fle

49、xible cables (1) and remove oneconnector (2).4. Remove four screws (3), then remove the main PCboard (4).Fig. 2-1-20? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? Confirm that the mark of the gear matches with thetriangle mark on the reverse side of the tray in the trayclose status. (The gear is rotated

50、with the slider locks.)(Refer to Fig. B.)Fig. 2-1-182-1-5. Rear Panel1. Remove the bush (1).2. Remove four screws (2), then remove the rear panel(3).Fig. 2-1-192-2-2. Output PC Board1. Remove the top cover. (Refer to item 2-1-1.)2. Peel off two tapes (1) and remove the connector (2).3. Remove two fl