Mitsubishi-DD6030-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,CAUTIONBefore 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:5.5 lb.External Dimensions:17x 2-3/4x8-7/8(W/H/D)S

4、ignal 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 Distortion:Less than 0.00

5、2%Wow and flutter:Below measurable level(less than 0.001%(W.PEAK) (EIAJ)ServiceManual2002MITSUBISH ELECTRICModelDD-6030DVD PlayerRadioFans.CN 收音机爱 好者资料库SAFETY NOTICESAFETY PRECAUTIONSLEAKAGE CURRENT CHECKPlug the AC line cord directly into a 120V AC outlet (donot use an isolation transformer for thi

6、s 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 ofcabinet (antennas, handle bracket, metal cabinetscrewheads, metal ov

7、erlays, 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, the

8、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 earth gr

9、oundsuch 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 turned on, you may not remove this laser caution label. If it is removed, laser radiationma

10、y be recceived.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 p

11、oint within an equilateral triangle isintended to alert the user to the presence of importantoperating and maintenance (servicing) instructions in theliterature accompanying the appliance.SAFETY NOTICESECTION 1GENERAL DESCRIPTIONSSECTION 1GENERAL DESCRIPTIONS1MGround conductive wrist strap for body.

12、Soldering iron with ground wire 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

13、to electrostatic discharge during 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 DESCRIPTIONS1-12. LOCATION OF MAIN

14、 PARTS 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 Mechanis

15、m chassis 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.

16、 1-2-6 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 assembl

17、y (Bottom 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 assemblyFron

18、t damperSub 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 h

19、ead is 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

20、 single (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

21、 screen: 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

22、external 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 foc

23、us direction?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.Repla

24、ce pickup 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? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?

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

26、? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?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

27、normal?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 I

28、C306.Check 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

29、 RF signalCD 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.

30、 With the 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

31、 pin 131 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

32、 IC502 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

33、(LDMN)E537 (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 prev

34、ent missing, 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 impr

35、operly, 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 th

36、e tray(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

37、(1) towards 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 th

38、e arrow 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

39、(2)ClawsClawFlexible 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-

40、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 1-1-1.)2. Eject the tray. (Refer to item 1-1-2.)3. Remove six fle

41、xible cables (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),

42、then remove 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

43、(3).3. 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 Bo

44、ard1. Remove 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. Mec

45、hanism 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. R

46、emove the 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

47、”. (Refer 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 r

48、emove the 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

49、assemblyNo 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 pane

50、l (4) a 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 sid