JVC-UXA7DVD-cs-sm 维修电路原理图.pdf

SERVICE MANUALCOPYRIGHT 2003 VICTOR COMPANY OF JAPAN, LTD.No.220132003/03UX-A7DVDMICRO COMPONENT SYSTEM22013200303UX-A7DVDTABLE OF CONTENTS1Important Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-22Disassembly method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-53Adjustment method. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-344Description of major ICs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-41DVD/SUPER VCD/VCD/CDDVDAUTO REVERSECOMPACTSUPER VIDEOUX-A7DVDD I G I T A LTAPEAUX/MDREV.MODEBASSFM/AMTREBLEM ULTI COLOR D ISPLA Y3 W A Y SPEA KER SYSTEM3 W A Y SPEA KER SYSTEMANGLEAUDIO123456789100+10DIMMERCANCELTOP MENUSETSTROBEPREV.FADEMUTINGBASS/TREBLEFM MODEDIGITALECHOKEYCONTROL KEYCONTROL 3D PHONICAHB PRONEXTRETURNSLOWRM-SUXA7DVDU REMOTE CONTROLGROUP SKIP+SLOWAUX/MDDVDSELECTFM/AMVOLUMESHIFTTAPEENTERMENU CHOICECOLORON SCREENPLAY MODEZOOMSUB TITLEREV. MODEDIGESTCLOCK/TIMERSTANDBY/ONDISPLAYSLEEPDVDLEVELAPOFF D I G I T A LCOMPACTSUPER VIDEOArea suffixUS - SingaporeUN - AseanRadioFans.CN 收音机爱 好者资料库UX-A7DVD1-2 (No.22013)SECTION 1Important Safety Precautions1.1 Safety Precautions(1) This design of this product contains special hardware andmany circuits and components specially for safety purposes.For continued protection, no changes should be made to theoriginal design unless authorized in writing by the man-ufacturer. Replacement parts must be identical to thoseused in the original circuits. Services should be per-formed by qualified personnel only.(2) Alterations of the design or circuitry of the product shouldnot be made. Any design alterations of the product shouldnot be made. Any design alterations or additions will voidthe manufacturers warranty and will further relieve themanufacture of responsibility for personal injury or propertydamage resulting therefrom.(3) Many electrical and mechanical parts in the products havespecial safety-related characteristics. These characteris-tics are often not evident from visual inspection nor can theprotection afforded by them necessarily be obtained by us-ing replacement components rated for higher voltage, watt-age, etc. Replacement parts which have these special safetycharacteristics are identified in the Parts List of Service Manu-al. Electrical components having such features are iden-tified by shading on the schematics and by () on theParts List in the Service Manual. The use of a substitute re-placement which does not have the same safety character-istics as the recommended replacement parts shown in theParts List of Service Manual may create shock, fire, or oth-er hazards.(4) The leads in the products are routed and dressed with ties,clamps, tubings, barriers and the like to be separated fromlive parts, high temperature parts, moving parts and/orsharp edges for the prevention of electric shock and firehazard. When service is required, the original lead routingand dress should be observed, and it should be confirmedthat they have been returned to normal, after reassembling.(5) Leakage shock hazard testing)After reassembling the product, always perform an isolationcheck on the exposed metal parts of the product (antennaterminals, knobs, metal cabinet, screw heads, headphonejack, control shafts, etc.) to be sure the product is safe tooperate without danger of electrical shock.Do not use a line isolation transformer during this check. Plug the AC line cord directly into the AC outlet. Using aLeakage Current Tester, measure the leakage currentfrom each exposed metal parts of the cabinet, particular-ly any exposed metal part having a return path to thechassis, to a known good earth ground. Any leakage cur-rent must not exceed 0.5mA AC (r.m.s.). Alternate check methodPlug the AC line cord directly into the AC outlet. Use an ACvoltmeter having, 1,000 ohms per volt or more sensitivity inthe following manner. Connect a 1,500 ohm 10W resistorparalleled by a 0.15 F AC-type capacitor between anexposed metal part and a known good earth ground.Measure the AC voltage across the resistor with the ACvoltmeter. Move the resistor connection to each exposed metal part,particularly any exposed metal part having a return path tothe chassis, and measure the AC voltage across the resistor.Now, reverse the plug in the AC outlet and repeat eachmeasurement. Voltage measured any must not exceed 0.75V AC (r.m.s.). This corresponds to 0.5 mA AC (r.m.s.). 1.2 Warning(1) This equipment has been designed and manufactured tomeet international safety standards.(2) It is the legal responsibility of the repairer to ensure thatthese safety standards are maintained.(3) Repairs must be made in accordance with the relevantsafety standards.(4) It is essential that safety critical components are replacedby approved parts.(5) If mains voltage selector is provided, check setting for localvoltage.1.3 CautionBurrs formed during molding may be left over on some partsof the chassis. Therefore, pay attention to such burrs in the case of pre-forming repair of this system.1.4 Critical parts for safetyIn regard with component parts appearing on the silk-screenprinted side (parts side) of the PWB diagrams, the parts that areprinted over with black such as the resistor ( ), diode ( )and ICP ( ) or identified by the mark nearby are criticalfor safety. When replacing them, be sure to use the parts of the same typeand rating as specified by the manufacturer. (Except the JC version)RadioFans.CN 收音机爱 好者资料库UX-A7DVD(No.22013)1-31.5 Preventing static electricityElectrostatic discharge (ESD), which occurs when static electricity stored in the body, fabric, etc. is discharged, can destroy the laser diode in the traverse unit (optical pickup). Take care to prevent this when performing repairs.1.5.1 Grounding to prevent damage by static electricityStatic electricity in the work area can destroy the optical pickup (laser diode) in devices such as DVD players. Be careful to use proper grounding in the area where repairs are being performed. (1) Ground the workbenchGround the workbench by laying conductive material (such as a conductive sheet) or an iron plate over it before placing thetraverse unit (optical pickup) on it.(2) Ground yourselfUse an anti-static wrist strap to release any static electricity built up in your body. (3) Handling the optical pickup In order to maintain quality during transport and before installation, both sides of the laser diode on the replacement opticalpickup are shorted. After replacement, return the shorted parts to their original condition. (Refer to the text.) Do not use a tester to check the condition of the laser diode in the optical pickup. The testers internal power source can easilydestroy the laser diode. 1.6 Handling the traverse unit (optical pickup)(1) Do not subject the traverse unit (optical pickup) to strong shocks, as it is a sensitive, complex unit. (2) Cut off the shorted part of the flexible cable using nippers, etc. after replacing the optical pickup. For specific details, refer to the replace-ment procedure in the text. Remove the anti-static pin when replacing the traverse unit. Be careful not to take too long a timewhen attaching it to the connector. (3) Handle the flexible cable carefully as it may break when subjected to strong force. (4) It is not possible to adjust the semi-fixed resistor that adjusts the laser power. Do not turn it.1.7 Attention when traverse unit is decomposed*Please refer to Disassembly method in the text for the DVD pickup unit. Apply solder to the short land sections before the flexible wire is disconnected from the connector CN101 on the DVD servo board. (If the flexible wire is disconnected without applying solder, the DVD pickup may be destroyed by static electricity.) In the assembly, be sure to remove solder from the short land sections after connecting the flexible wire.Short landsDVD servo boardFlexible wireCN202CN201DVD mechanism assemblyConnectorUX-A7DVD1-4 (No.22013)1.8 Important for laser products (1) CLASS 1 LASER PRODUCT(2) DANGER : Invisible laser radiation when open and interlock failed or defeated. Avoid direct exposure to beam.(3) CAUTION : There are no serviceable parts inside the Laser Unit. Do not disassemble the Laser Unit. Replace thecomplete Laser Unit if it malfunctions.(4) CAUTION : The compact disc player uses invisible laserradiation and is equipped with safety switches which prevent emission of radiation when the drawer is open andthe safety interlocks have failed or are de feated. It is dangerous to defeat the safety switches.(5) CAUTION : If safety switches malfunction, the laser is ableto function.(6) CAUTION : Use of controls, adjustments or performance ofprocedures other than those specified herein may result inhazardous radiation exposure.CAUTIONPlease use enough caution not to see the beam directlyor touch it in case of anadjustment or operation check.VARNINGOsynlig laserstrlning r denna del r ppnad och sprren rurkopplad. Betrakta ej strlen.VAROAvattaessa ja suojalukitus ohitettaessa olet alttiina nkymt-tmlle lasersteilylle. l katso steeseen.ADVARSELUsynlig laserstrling ved bning, nr sikkerhedsafbrydere erude af funktion. Undg udsasttelse for strling.ADVARSELUsynlig laserstrling ved pning, nr sikkerhetsbryteren er avs-lott. unng utsettelse for strling.REPRODUCTION AND POSITION OF LABELSCaution labelUX-A7DVD(No.22013)1-5SECTION 2Disassembly method2.1 Main body2.1.1Removing the metal cover(See Fig.13)(1) Remove the six screws A on the back of the body.(2) Remove the screw B on each side of the body.(3) Detach the rear side of the metal cover upward while pull-ing the lower sides outward.Fig.1Fig.2Fig.3AAABMetal coverBMetal coverUX-A7DVD1-6 (No.22013)2.1.2Removing the DVD mechanism assembly(See Fig.4, 5) Prior to performing the following procedure, remove the metalcover.(1) Remove the three screws C attaching the DVD mecha-nism assembly on top of the body.(2) Disconnect connector CN502 and CN503 on the DVD ser-vo board upward at the bottom of the DVD mechanism as-sembly.Bring up the DVD mechanism assembly and remove back-ward.Fig.4Fig.5CCCDVD mechanism assemblyCN502CN503DVD mechanism assmblyUX-A7DVD(No.22013)1-72.1.3Removing the front panel assembly(See Fig.69) Prior to performing the following procedure, remove the metalcover and the DVD mechanism assembly.(1) Disconnect the card wire from connector CN705 on the mi-crocomputer board in the center of the right side of thebody.(2) Disconnect the card wire from connector CN301,and thewires from connector CN300 and CN710 on the mainboard in the center of the left side of the body.(3) Disconnect the card wire from connector CN704, and thewire from CN703 on the microcomputer board.ATTENTION:When disconnecting the wires from CN703 and CN710,remove the spacer attaching the wires.(4) Disconnect the card wire from connector CN442 on the FLconnection board on top of the body.(5) Remove the screw D on each side of the body.(6) Remove the two screws E on the bottom of the body.(7) Release the joint a on the bottom and the two joints b onthe right and left sides of the body using a screwdriver. Re-move the front panel assembly toward the front.Fig.6Fig.7Fig.8Fig.9DFront panel assemblybMicro computer boardCN705DFront panel assemblybMicro computer boardCN704Main boardCN710CN301CN300CN703SpacerCN710FL connection boardCN442SpacerCN703CN704DFront panel assemblyEaUX-A7DVD1-8 (No.22013)2.1.4Removing the rear cover / rear panel(See Fig.1014) Prior to performing the following procedure, remove the metalcover and the DVD mechanism assembly.(1) Remove the two screws F on the back of the body.REFERENCE:There is no need to remove the metal cover.(2) Disconnect the card wire from connector CN1 on the tunerpack on the right side of the body.(3) Remove the twelve screws G and the two screws H on theback of the body.(4) Release the two joints c on the lower right and left sides ofthe rear panel.REFERENCE:The rear panel with the tuner pack comes off.Fig.10Fig.11Fig.12Fig.13Fig.14Rear coverRear panelFRear panelTuner packCN1GGGGHRear coverRear panelcRear panelcUX-A7DVD(No.22013)1-92.1.5Removing the tuner pack(See Fig.15) Prior to performing the following procedure, remove the metalcover.(1) Disconnect the card wire from connector CN1 on the tunerpack on the right side of the body.(2) Remove the two screws I on the back of the body.Fig.152.1.6Removing the fan(See Fig.16,17) Prior to performing the following procedure, remove the metalcover, the DVD mechanism assembly, the rear cover/rear pan-el and the DVD relay board.(1) Disconnect the wire from connector CN711 on the micro-computer board on the right side of the body.(2) Remove the three screws J attaching the fan bracket ontop of the body and release the joint d.(3) Remove the two screws K attaching the fan.Fig.16Fig.17CN1Tuner packIdJJJMicro computer boardCN711Fan bracketKFan bracketFanUX-A7DVD1-10 (No.22013)2.1.7Removing the headphone board(See Fig.18, 19) Prior to performing the following procedure, remove the metalcover, the DVD mechanism assembly and the front panel as-sembly.(1) Disconnect the wire from connector CN310 on the mainboard on the left side of the body.(2) Release the wires from the two clamps on the bottom chas-sis.(3) Remove the screw L attaching the headphone board onthe right side of the body.Fig.18Fig.19Headphone boardClampMain boardCN310LHeadphone boardUX-A7DVD(No.22013)1-112.1.8Removing the main board(See Fig.20, 21) Prior to performing the following procedure, remove the metalcover, the DVD mechanism assembly, the front panel assem-bly and the rear cover/ rear panel.(1) Remove the two screws M and the three screws N, andthen remove the heat sink.(2) Disconnect the wires from connector CN307 and CN310,the card wire from CN312 on the main board on the left sideof the body.(3) Remove the screw O and P attaching the main board.(4) Disconnect connector CN303, CN304, CN305 and CN306on the main board. Release the two joints e at the bottom.(5) Draw out the main board and disconnect the wire from con-nector CN311.Fig.20Fig.212.1.9Removing the DVD relay board(See Fig.22) Prior to performing the following procedure, remove the metalcover, the DVD mechanism assembly and the rear cover/ rearpanel.(1) Disconnect the card wire from connector CN515 on theDVD relay board.(2) Remove the screw Q attaching the DVD relay board on topof the body.(3) Disconnect connector CN511 and CN512 on the DVD relayboard.Fig.22MNHeat sinkMain boardCN303CN304CN305CN306CN312CN307CN310PeeCN311OQDVD relay baoardCN512CN511CN515UX-A7DVD1-12 (No.22013)2.1.10 Removing the base chassis / microcomputer board(See Fig.2325) Prior to performing the following procedure, remove the metalcover, the DVD mechanism assembly, the front pan