Mitsubishi-DD4021-dvd-sm 维修电路原理图.pdf

DVD PLAYER 2001MODELDD-4021ManualServiceMITSUBISHI ELECTRICTABLE OF CONTENTSSPECIFICATIONS . 1-1-1 LASER BEAM SAFETY PRECAUTIONS. 1-2-1 IMPORTANT SAFETY PRECAUTIONS. 1-3-1 STANDARD NOTES FOR SERVICING . 1-4-1 CABINET DISASSEMBLY INSTRUCTIONS. 1-5-1 BLOCK DIAGRAMS . 1-6-1 SCHEMATIC DIAGRAMS / CBAS AND TEST POINTS . 1-7-1 WAVEFORMS. 1-8-1 WIRING DIAGRAM. 1-9-1 SYSTEM CONTROL TIMING CHARTS . 1-10-1 IC PIN FUNCTION DESCRIPTIONS.1-11-1 LEAD IDENTIFICATIONS. 1-12-1 EXPLODED VIEWS. 1-13-1 MECHANICAL PARTS LIST. 1-14-1 ELECTRICAL PARTS LIST . 1-15-1 MITSUBISHI DIGITAL ELECTRONICS AMERICA, INC.9351 Jeronimo Road, Irvine, CA 92618-1904Copyright 2001 Mitsubishi Digital Electronics America, Inc.All Rights ReservedRadioFans.CN 收音机爱 好者资料库HOW TO INITIALIZE THE SETUP MENU After turning the power ON, without a disc in the tray, press the 1, 2, 3, 4, DISPLAY and ENTER buttonson the remote control unit in this order. Then, after turning the power OFF temporarily, turn the power ON againto intialize the Setup Menu.HOW TO CLEAR THE PASSWORD PROTECTION (In case the Parental Lock password is forgotten) To release parental lock, initialize the setup menu using the procedure above.HOW TO SET OR CLEAR THE TRAY LOCK To set the tray lock mode to on, follow the procedures below: 1. With loading a disc, set the DVD player to the stop mode. 2. Press the SETUP button to display the SETUP menu. 3. Press the TITLE button. 4. Press the 3 button. 5. Press the AUDIO button. 6. Press the 0 button. 7. Press the SETUP button. Tray Lock mode is set to ON and Tray Lock On is displayed on the top right ofthe screen.While the Tray Lock mode is on, the tray cannot be opened or closed. Other operations are available.To release the Tray Lock mode, perform the above procedures again. Tray Lock mode is set to OFF and TrayLock Off is displayed on the top right of the screen.HOW TO MANUAL EJECT 1. Remove the Top Case. 2. Insert the eject-bar (length = approximately 3 mm,diameter = approximately 8 mm) into the manual ejecthole on the PCB Holder. Then, press it until the trayis ejected. 3. Pull out the tray.Manufatured under license from Dolby Laboratories. Dolby and the double-D symbol are trademarks of DolbyLaboratories. Confidential Unpublished Works.(1992-1997 Dolby Laboratories, Inc. All rights reserved.) DTS and DTS Digital Out are trademarks of Digital Theater Systems Inc.Eject-Bar (Length = approximately 80 mm, Diameter = approximately 3 mm)Manual Eject HoleTrayTop CasePCB HolderRadioFans.CN 收音机爱 好者资料库SPECIFICATIONSITEMCONDITIONSUNITNOMINALLIMIT1 Video Output75 ohm loadVpp1.02 Optical Digital OutdBm-183 Audio(PCM)3-1. Output Level1kHz 0dBVrms2.03-2. S/NdB1103-3. Freq. Response DVDfs=48kHz 2022kHzdB 2 CDfs=44.1kHz 2020 kHzdB 23-4. THD+N1 kHz 0dB%0.005NOTES: 1. All Items are measured without pre-emphasis unless otherwise specified. 2. Power supply : AC120 V 60 Hz 3. Load imp. : 100 K ohm 4. Room ambient : +25 C1-1-1E5500SPLASER BEAM SAFETY PRECAUTIONSThis DVD player uses a pickup that emits a laser beam.The laser beam is emitted from the location shown in the figure. When checking the laser diode, be sure to keep youreyes at least 30cm away from the pickup lens when the diode is turned on. Do not look directly at the laser beam.Caution: Use of controls and adjustments, or doing procedures other than those specified herein, may result inhazardous radiation exposure.Do not look directly at the laser beam comingfrom the pickup or allow it to strike againstyour skin.LASER RADIATIONWHEN OPEN. DO NOTSTARE INTO BEAM.CAUTIONLocation: Inside Top of DVD mechanism.1-2-1DVD_LASERIMPORTANT SAFETY PRECAUTIONSProduct Safety NoticeSome electrical and mechanical parts have specialsafety-related characteristics which are often not evi-dent from visual inspection, nor can the protection theygive necessarily be obtained by replacing them withcomponents rated for higher voltage, wattage, etc. Partsthat have special safety characteristics are identified bya ? on schematics and in parts lists. Use of a substi-tute replacement that does not have the same safetycharacteristics as the recommended replacement partmight create shock, fire, and/or other hazards. TheProducts Safety is under review continuously and newinstructions are issued whenever appropriate. Prior toshipment from the factory, our products are carefullyinspected to confirm with the recognized product safetyand electrical codes of the countries in which they areto be sold. However, in order to maintain such compli-ance, it is equally important to implement the followingprecautions when a set is being serviced.Precautions during ServicingA.Parts identified by the ? symbol are critical forsafety. Replace only with part number specified.B.In addition to safety, other parts and assemblies arespecified for conformance with regulations applyingto spurious radiation. These must also be replacedonly with specified replacements.Examples: RF converters, RF cables, noise block-ing capacitors, and noise blocking filters, etc.C.Use specified internal wiring. Note especially: 1) Wires covered with PVC tubing 2) Double insulated wires 3) High voltage leadsD.Use specified insulating materials for hazardous liveparts. Note especially: 1) Insulation tape 2) PVC tubing 3) Spacers 4) Insulators for transistorsE.When replacing AC primary side components(transformers, power cord, etc.), wrap ends of wiressecurely about the terminals before soldering.F.Observe that the wires do not contact heat produc-ing parts (heatsinks, oxide metal film resistors, fus-ible resistors, etc.).G.Check that replaced wires do not contact sharpedges or pointed parts.H.When a power cord has been replaced, check that5 - 6 kg of force in any direction will not loosen it.I.Also check areas surrounding repaired locations.J.Use care that foreign objects (screws, solder drop-lets, etc.) do not remain inside the set.K.Crimp type wire connectorThe power transformer uses crimp type connectorswhich connect the power cord and the primary sideof the transformer. When replacing the transformer,follow these steps carefully and precisely to preventshock hazards.Replacement procedure1)Remove the old connector by cutting the wires at apoint close to the connector.Important: Do not re-use a connector. (Discard it.)2)Strip about 15 mm of the insulation from the ends ofthe wires. If the wires are stranded, twist the strandsto avoid frayed conductors.3)Align the lengths of the wires to be connected. Insertthe wires fully into the connector.4)Use a crimping tool to crimp the metal sleeve at itscenter. Be sure to crimp fully to the complete closureof the tool.L.When connecting or disconnecting the internal con-nectors, first, disconnect the AC plug from the ACoutlet.1-3-1DVD_SFN1Safety Check after ServicingExamine the area surrounding the repaired location fordamage or deterioration. Observe that screws, parts,and wires have been returned to their original positions.Afterwards, do the following tests and confirm the speci-fied values to verify compliance with safety standards.1. Clearance DistanceWhen replacing primary circuit components, confirmspecified clearance distance (d) and (d) between sol-dered terminals, and between terminals and surround-ing metallic parts. (See Fig. 1)Table 1 : Ratings for selected areaAC Line VoltageClearance Distance (d) (d)120 V 3.2 mm (0.126 inches)Note: This table is unofficial and for reference only. Be sure to confirm the precise values.2. Leakage Current TestConfirm the specified (or lower) leakage current be-tween B (earth ground, power cord plug prongs) andexternally exposed accessible parts (RF terminals, an-tenna terminals, video and audio input and output ter-minals, microphone jacks, earphone jacks, etc.) is lowerthan or equal to the specified value in the table below. Measuring Method (Power ON) :Insert load Z between B (earth ground, power cord plugprongs) and exposed accessible parts. Use an ACvoltmeter to measure across the terminals of load Z.See Fig. 2 and the following table.Table 2 : Leakage current ratings for selected areasAC Line VoltageLoad ZLeakage Current (i)Earth Ground (B) to:120 V0.15F CAP. & 1.5k RES.Connected in paralleli 0.5mA PeakExposed accessible partsNote: This table is unofficial and for reference only. Be sure to confirm the precise values.Chassis or Secondary ConductorddPrimary Circuit TerminalsFig. 1AC Voltmeter(High Impedance)Exposed Accessible PartBEarth Ground Power Cord Plug ProngsZ1.5k0.15FFig. 21-3-2DVD_SFN1STANDARD NOTES FOR SERVICINGCircuit Board Indicationsa.The output pin of the 3 pin Regulator ICs is indicatedas shown.b.For other ICs, pin 1 and every fifth pin are indicatedas shown.c.The 1st pin of every male connector is indicated asshown.Instructions for Connectors1.When you connect or disconnect the FFC (FlexibleFoil Connector) cable, be sure to first disconnect theAC cord.2.FFC (Flexible Foil Connector) cable should be in-serted parallel into the connector, not at an angle.How to Remove / Install Flat Pack-IC1. RemovalWith Hot-Air Flat Pack-IC Desoldering Machine:(1)Prepare the hot-air flat pack-IC desoldering ma-chine, then apply hot air to the Flat Pack-IC (about5 to 6 seconds). (Fig. S-1-1)(2)Remove the flat pack-IC with tweezers while apply-ing the hot air.(3)Bottom of the flat pack-IC is fixed with glue to theCBA; when removing entire flat pack-IC, first applysoldering iron to center of the flat pack-IC and heatup. Then remove (glue will be melted). (Fig. S-1-6)(4)Release the flat pack-IC from the CBA using tweez-ers. (Fig. S-1-6)Caution:1.Do not supply hot air to the chip parts around the flatpack-IC for over 6 seconds because damage to thechip parts may occur. Put masking tape around theflat pack-IC to protect other parts from damage.(Fig. S-1-2)2.The flat pack-IC on the CBA is affixed with glue, sobe careful not to break or damage the foil of eachpin or the solder lands under the IC when removingit.Hot-airFlat Pack-ICDesolderingMachineCBAMaskingTapeTweezersFlat Pack-ICFig. S-1-2Fig. S-1-1Top ViewOutInBottom ViewInput510Pin 1Pin 1FFC CableConnectorCBA* Be careful to avoid a short circuit.1-4-1DVD_NOTEWith Soldering Iron:(1)Using desoldering braid, remove the solder from allpins of the flat pack-IC. When you use solder fluxwhich is applied to all pins of the flat pack-IC, youcan remove it easily. (Fig. S-1-3)(2)Lift each lead of the flat pack-IC upward one by one,using a sharp pin or wire to which solder will notadhere (iron wire). When heating the pins, use a finetip soldering iron or a hot air desoldering machine.(Fig. S-1-4)(3)Bottom of the flat pack-IC is fixed with glue to theCBA; when removing entire flat pack-IC, first applysoldering iron to center of the flat pack-IC and heatup. Then remove (glue will be melted). (Fig. S-1-6)(4)Release the flat pack-IC from the CBA using tweez-ers. (Fig. S-1-6)With Iron Wire:(1)Using desoldering braid, remove the solder from allpins of the flat pack-IC. When you use solder fluxwhich is applied to all pins of the flat pack-IC, youcan remove it easily. (Fig. S-1-3)(2)Affix the wire to a workbench or solid mounting point,as shown in Fig. S-1-5.(3)While heating the pins using a fine tip soldering ironor hot air blower, pull up the wire as the solder meltsso as to lift the IC leads from the CBA contact padsas shown in Fig. S-1-5.(4)Bottom of the flat pack-IC is fixed with glue to theCBA; when removing entire flat pack-IC, first applysoldering iron to center of the flat pack-IC and heatup. Then remove (glue will be melted). (Fig. S-1-6)(5)Release the flat pack-IC from the CBA using tweez-ers. (Fig. S-1-6)Note:When using a soldering iron, care must be taken toensure that the flat pack-IC is not being held by glue.When the flat pack-IC is removed from the CBA,handle it gently because it may be damaged if forceis applied.Flat Pack-ICDesoldering BraidSoldering IronFig. S-1-3Fine TipSoldering IronSharp PinTo Solid Mounting PointHot Air BlowerIron WireSoldering IronorFig. S-1-4 Fig. S-1-5CBATweezersFlat Pack-ICFine TipSoldering IronFig. S-1-61-4-2DVD_NOTE2. Installation(1)Using desoldering braid, remove the solder from thefoil of each pin of the flat pack-IC on the CBA so youcan install a replacement flat pack-IC more easily.(2)The G mark on the flat pack-IC indicates pin 1.(See Fig. S-1-7.) Be sure this mark matches the 1on the PCB when positioning for installation. Thenpre- solder the four corners of the flat pack-IC. (SeeFig. S-1-8.)(3)Solder all pins of the flat pack-IC. Be sure that noneof the pins have solder bridges.Instructions for Handling SemiconductorsElectrostatic breakdown of the semiconductors mayoccur due to a potential difference caused by electro-static charge during unpacking or repair work.1. Ground for Human BodyBe sure to wear a grounding band (1M) that is properlygrounded to remove any static electricity that may becharged on the body.2. Ground for WorkbenchBe sure to place a conductive sheet or copper plate withproper grounding (1M) on the workbench or othersurface, where the semiconductors are to be placed.Because the static electricity charge on clothing will notescape through the body grounding band, be careful toavoid contacting semiconductors with your clothing.CBACBAGrounding BandConductive Sheet orCopper Plate1M1MPresolderSoldering IronCBAFlat Pack-ICExample :Pin 1 of the Flat Pack-ICis indicated by a G mark.Fig. S-1-7Fig. S-1-81-4-3DVD_NOTECABINET DISASSEMBLY INSTRUCTIONS1. Disassembly FlowchartThis flowchart indicates the disassembly steps to gainaccess to item(s) to be serviced. When reassembling,follow the steps in reverse order. Bend, route, and dressthe cables as they were originally.2. Disassembly MethodID/LOC.No.PARTREMOVALFig.No.REMOVE/*UNHOOK/UNLOCK/RELEASE/UNPLUG/DESOLDERNote1Top Case15(S-1)-2FrontAssembly2*2(L-1), Tray Panel,*2(L-2), *5(L-3)1-11-23FunctionCBA3*3(L-4), *(CN2001)-4PCBHolder42(S-2)-5DVDMecha4,5*(CN001, CN201),2(S-3)2-12-22-336AV CBA64(S-4), 4(S-5),*2(L-5), *(CN701,CN501)-7DVDMechaCBA Unit64(S-6)-8RearPanel73(S-7)-Reference NotesCAUTION 1: Locking Tabs (L-1) are fragile. Be carefulnot to break them. 1-1.Connect the wall plug to an AC outlet and press theOPEN/CLOSE button to open the Tray.1-2.First, remove the Tray Panel by releasing two Lock-ing Tabs (L-1). Second, release two Locking Tabs(L-2). Then, release five Locking Tabs (L-3) (to dothis, first release three Locking Tabs (A) at thebottom, and then two Locking Tabs (B) at the side.)(Fig. 2)CAUTION 2: Electrostatic breakdown of the laser diodein the optical system block may occur as a potentialdifference caused by electrostatic charge accumulatedon cloth, human body etc, during unpacking or repairwork.To avoid damage of pickup follow next procedures.2-1.Slide out the pickup unit as shown in Fig. 5.2-2.Short the copper pattern (half-moon shape) of FPCcable with solder before removing the FFC cable(CN001) from it. If you disconnect the FFC cable(CN001), the laser diode of pickup will be destroyed.(Fig. 5)2-3.Disconnect Connector (CN201). Remove twoScrews (S-