Jvc-UXA-7-DVD-Service-Manual电路原理图.pdf

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1、SERVICE MANUALCOPYRIGHT 2003 VICTOR COMPANY OF JAPAN, LTD.No.220132003/03UX-A7DVDMICRO COMPONENT SYSTEM22013200303UX-A7DVDTABLE OF CONTENTS1 Important Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-22 Disasse

2、mbly method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-53 Adjustment method. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3、1-344 Description of major ICs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-41DVD/ S U P E R V C D/V C D/ C DDVDAUT O R E V E R S ECOMPACTSUPER VIDEOUX-A7DVDDIGITALTAPEAUX/MDREV.MOD EBASSFM/AMTREBLEMU L T I C O L O R D

4、I S P L AY3WAY S P E AKE R S Y S T E M3WAY S P E AKE R S Y S T E MANGLEAUDIO12345678910 0 +10DIMMERCANCELTOP MENUSETSTROBEPREV.FADEMUTINGBASS/TREBLEFM MODEDIGITALECHOKEYCONTROL KEYCONTROL 3D PHONIC AHB PRONEXTRETURNSLOWRM-SUXA7DVDU REMOTE CONTROLGROUP SKIP +SLOWAUX/MDDVDSELECT FM/AMVO LUM ESHIFTTAPE

5、EN TERMENU CHOICECOLORON SCREEN PLAY MODEZOOMSUB TITLEREV. MODEDIGESTCLOCK/TIMERSTANDBY/ONDISPLAYSLEEPDVDLEVELAPOFFDIGITALCOMPACTSUPER VIDEOArea suffixUS - SingaporeUN - AseanUX-A7DVD1-2 (No.22013)SECTION 1Important Safety Precautions1.1 Safety Precautions(1) This design of this product contains spe

6、cial 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-f

7、ormed 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 fo

8、r 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 re

9、placement 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 t

10、he 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,

11、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 re

12、turned 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 t

13、ooperate 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 a“Leakage Current Tester“, measure the leakage currentfrom each exposed metal parts of the cabinet, particular-ly any exposed metal part hav

14、ing 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 o

15、hm 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 c

16、hassis, 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 internatio

17、nal 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

18、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 t

19、he 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

20、the manufacturer. (Except the JC version)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 t

21、his 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 workben

22、chGround 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

23、 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 di

24、ode 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 cabl

25、e 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 carefu

26、lly 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

27、 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

28、 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 be

29、am.(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 whe

30、n 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 herei

31、n 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

32、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 LAB

33、ELSCaution labelUX-A7DVD(No.22013)1-5SECTION 2Disassembly method2.1 Main body2.1.1 Removing 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

34、 outward.Fig.1Fig.2Fig.3AAABMetal coverBMetal coverUX-A7DVD1-6 (No.22013)2.1.2 Removing 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 co

35、nnector 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)1-72.1.3 Removing the front panel assembly(See Fig.69) Prio

36、r 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 a

37、nd 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 fro

38、m 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 fron

39、t panel assembly toward the front.Fig.6Fig.7Fig.8Fig.9DFront panel assemblybMicro computer boardCN705DFront panel assemblybMicro computer boardCN704Main boardCN710CN301 CN300 CN703SpacerCN710FL connection boardCN442SpacerCN703CN704DFront panel assemblyEaUX-A7DVD1-8 (No.22013)2.1.4 Removing the rear

40、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

41、 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 pan

42、elTuner packCN1GGGGHRear coverRear panelcRear panelcUX-A7DVD(No.22013)1-92.1.5 Removing 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 scre

43、ws I on the back of the body.Fig.152.1.6 Removing 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

44、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)2.1.7 Removing the headphone

45、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 board