Mitsubishi-DD8020-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), 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:17WWeight

4、:6.6 lb.External Dimensions:17x 3-3/8x12-1/8(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

5、than 108 dB (EIAJ)Harmonic Distortion:Less than 0.002%Wow and flutter:Below measurable level(less than 0.001%(W.PEAK) (EIAJ)SerSerSerSerServiceviceviceviceviceManualManualManualManualManual2002MITSUBISH ELECTRICModelDD-8020DVD PlayerOPEN/CLOSESTOPPLAYPAUSE/STEPPOWERDVD AUDIO/VIDEO PLAYER DD-8020STAN

6、DBYSKIPREVFWD/ /CDVDTITLETRK CHPTOTAL REMAINMEMORYHDCDPROGRESSIVEAUDIORadioFans.CN 收音机爱 好者资料库-RadioFans.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 this check). Use anAC voltmeter, havin

7、g 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 overlays, control shafts, etc.).Measu

8、re 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 fault must be located and corrected

9、.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 groundsuch as a water pipe,conduit, e

10、tc.1500 ?10 W0.15 F 150V ACAC OUTLETTest all exposed metal.Voltmeter Hook-up for Leakage Current CheckLASER BEAM CAUTION LABELWhen the power supply is turned on, you may not remove this laser caution label. If it is removed, laser radiationmay be recceived.The lightning flash with arrowhead symbol,

11、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 within an equilateral triangle isintended to alert th

12、e user to the presence of importantoperating and maintenance (servicing) instructions in theliterature accompanying the appliance.SAFETY NOTICESECTION 2PART REPLACEMENT AND ADJUSTMENT PROCEDURESSECTION 3SERVICING DIAGRAMS1. STANDING PC BOARDS FOR SERVICING . 3-12. CIRCUIT SYMBOLS ANDSUPPLEMENTARY EX

13、PLANATION. 3-22-1. Precautions for Part Replacement . 3-22-2. Solid Resistor Indication .3-22-3. Capacitance Indication. 3-22-4. Inductor Indication . 3-32-5. Waveform and Voltage Measurement. 3-33. PRINTED WIRING BOARD ANDSCHEMATIC DIAGRAM. 3-54. BLOCK DIAGRAMS.3-74-1. Overall Block Diagram . 3-74-

14、2. Power Supply Block Diagram . 3-94-3. Front Display, Power Switch Block Diagram .3-104-4. Main Block Diagrams . 3-134-5. Output Block Diagram . 3-175. CIRCUIT DIAGRAMS. 3-195-1. Power Supply Circuit Diagram. 3-195-2. Front Display, Power Switch Circuit Diagram. 3-215-3. Main Circuit Diagram . 3-24

15、5-4. Output Circuit Diagram. 3-295-5. Motor System Circuit Diagrams. 3-346. PC BOARDS . 3-356-1. Power Supply PC Board. 3-356-2. Main PC Board . 3-376-3. Output PC Board. 3-47CONTENTSSECTION 1GENERAL DESCRIPTIONS1. PREPARATION FOR SERVICING . 1-12. LOCATION OF MAIN PARTS ANDMECHANISM PARTS . 1-22-1.

16、 Location of Main Parts.1-22-2. Location of 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. M

17、ain PC Board . 2-41-2-2. Output PC Board . 2-41-2-3. Power 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 .

18、2-81-3-6. Gear A Assembly, Gear B andRack Gear Assembly .2-81-3-7. Feed Motor . 2-93. TROUBLESHOOTING. 1-73-1. Main Circuit. 1-73-1-1. Servo System . 1-73-1-2. Location Diagram of Servo Test Point . 1-14SECTION 4PARTS LISTSAFETY PRECAUTION . 4-1NOTICE . 4-1ABBREVIATIONS . 4-11. Integrated Circuit (I

19、C) . 4-12. Capacitor (Cap) . 4-13. Resistor (Res). 4-14. EXPLODED VIEWS . 4-24-1. Packing Assembly . 4-24-2. Chassis Assembly. 4-34-3. Mechanism Assembly. 4-45. PARTS LIST. 4-6-SECTION 1GENERAL DESCRIPTIONSSECTION 1GENERAL DESCRIPTIONS1MGround conductive wrist strap for body.Soldering iron with grou

20、nd 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 to electrostatic dischar

21、ge 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 PARTS AND MECHANISM PAR

22、TS2-1. Location of Main PartsFig. 1-2-1EU05 Output PC boardFeed motor PC boardEU03 Front display PC boardLoading motor PC boardDisc motor PC boardEU04 Power SW PC boardEU01 Main PC boardEU02 Power supply PC board1-22-2. Location of Mechanism PartsFig. 1-2-2 Mechanism chassis assembly (Top side)Fig.

23、1-2-3 Mechanism chassis assembly (Bottom side)TrayClamper stayLoading motorPC boardMechanism chassis1-3Fig. 1-2-4 Mechanism chassis assembly (Internal side)Loading beltLoading motorKick leverCam SliderGearGearGearDisc motor1-4Fig. 1-2-5 Pickup mechanism chassis assembly (Top side)Fig. 1-2-6 Pickup m

24、echanism chassis assembly (Bottom side)Front damperRack gearassemblyGear A Gear B assemblyFront damperSub chassisRear damperPickup assemblyRear damperFeed motorFeed motorPC boardNote:When servicing, note that this model has two types ofpickup mechanism assembly.Type A is a service part. Type B can b

25、e replaced with a Type A pickup.1-5Fig. 1-2-7 Pickup mechanism chassis assembly (Top side)Fig. 1-2-8 Pickup mechanism chassis assembly (Bottom side)Front damperRack gearassemblyGear A Gear B assemblyFront damperSub chassisRear damperPickup assemblyRear damperFeed motorFeed motorPC board1-63. TROUBLE

26、SHOOTING3-1. 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 CN502, TCLS=LDisc presence/absence and disc judgementIs a disc present?DVD or

27、 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 close operationPin C9 of IC306 (E537): LDMP = H/LPin Y19 of IC306 (E538): LD

28、MN = 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: NO DISCYYNGNN2Fig. 1-3-11-7Pickup (P.U.) transmission initial operation does not occur.The pickup transmission initial operation is carried out

29、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 pulse of 1.65V 1.65V develop at pin 162 of IC401?Check B

30、US between IC401-IC306 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 IC401.Does search signal output at both edges of focus coil? (Pins 15 to 18 of CN501)Does focus searchvolta

31、ge 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 pickup head.Check peripheral circuit of IC306.Check IC503.YYYY3NNNYNNFig. 1-3-2Fig. 1-3-31-8Disc kind misjudgement (Initial setting is NG.)Replace

32、pickup head.Lens cleaning.Check IC502.Are FE and RFSB signals for each disc normal?Check peripheral circuit of IC306.2-2YNCheck laser operating current.Check laser current. I min lop I maxCheck pins 13, 14 and 15 of IC502serial bus.Check peripheralcircuits of IC502,Q501, Q502.Check solder removalof

33、the short land forlaser diode protection.Check FE and RFSB signallop I maxlop I min3Check wiring forpickup head.Replace pickupmechanism.YYNlop 200 mALaser operating currentDVD IopDVD Iop = Voltage between (E559 and E534) /10?CD Iop = Voltage between (E536 and E534) /10?CD Iopmin20mA20mA35mA45mA60mA8

34、0mAtypmaxCAUTIONThe laser ray emitting out from the pickup head is very harmful to your eyes.Keep your eyes from the objective lens at least 300mm distance during the pickup head operating.When you perform solder removal work, please turn OFF a set power supply and perform theground of human body an

35、d a tool.To turn on each laser diode forcibly, press the following buttons on the remote controller.DVD LD:CD LD:After checked the laser current, press POWER or OPEN/CLOSE button to turn it off.ZOOM, 0, 3, 0, ZOOMZOOM, 0, 3, 1, ZOOMFig. 1-3-4Fig. 1-3-5? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?

36、? ? ? ? ? ? ? ? ?Fig. 1-3-6Fig. 1-3-7Fig. 1-3-81-9? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?Fig. 1-3-9(2) Picture appears (PLAY)1-10? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?Focus servo is NG.Are FE, RFSB, FSON signals normal?Check peripheral

37、 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. 1-3-121-11Tracking servo is NG.Is TE signal normal?Check peripheral circuit of IC306.Check IC502.6Y

38、N? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?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 IC402.Check peripheral circuits of IC401 and IC306.Does pulse of L = 1.65V and H = 3.3V develop at p

39、in 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 I

40、C502 and IC401.7YNNNNYYYDVD 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 signalCD RF signalPin 30 (TP502) of IC502CD PLCKPin 117 (TP409) of IC401CH1 : TP502

41、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 the PLL locked, the eye pattern is identifiedclearly when triggered with the read

42、clock PLCK.1-13Fig. 1-3-213-1-2. Location Diagram of Servo Test PointCN503CN501CN701CN901CN302CN601CN603CN502IC503IC502IC313IC312IC401IC306TP502 RFOE559 DVDE538 LDMNE544 FOOE534 +5VE536 CDE537 LDMPTP405 FETP504 RFCTTP406 TETP401 VRFEDTP408 RFRPTP410 FLGATP411 FLGBTP409 PLCKTP412 VMCKTP503 RFSB1-14SE

43、CTION 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 missing, dropping, etc. o

44、f 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, thescrew holes will b

45、e easily damaged and the parts can not be fixed.1. REPLACEMENT OF MECHANICAL 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

46、(1)Screw (1)Top cover (2)Screws (1)Clamper stay (2)Clamper stay (2)ClawClawsSpringScrews (1)Clamperstay (2)ClawA2-11-1-3. 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 dama

47、ge the pickup and other parts.Fig. 2-1-41. Eject the tray (3).2. Twist the tray panel (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. 2-1-5.)3. When mount

48、ing the tray panel (4), insert the tray panel(4) along the grooves of the both sides of the tray (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

49、 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 normallyand mount the clamper stay.Fig. 2-1-3ScrewdriverMechanismchassis assembly (1)Tray (3)Front panelSlider (2)2-2? ? ? ? ? ? ? ?Rear panel (2)Screws (1)Fig. 2-1-51-1-4.

50、 Front Panel and Tray1. Remove the flexible cable (1).2. Remove one screw (2) and remove the GND lead (5).3. Release four claws and remove the front panel (4).4. 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