Jvc-UXZ-27-MDR-Service-Manual电路原理图.pdf

SERVICE MANUALCOPYRIGHT © 2003 VICTOR COMPANY OF JAPAN, LTD.No.220422003/02UX-Z7MDRMICRO COMPONENT MD SYSTEM22042200302UX-Z7MDRTABLE OF CONTENTS1 Important Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-22 Disassembly Method. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-53 Adjustment method. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-374 Description of major ICs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-44Area Suffix E - Continental EuropeUX-Z7MDR1-2 (No.22042)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 a“Leakage 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 µF 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)UX-Z7MDR(No.22042)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 tester's 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) I t 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 CD pickup unit. Apply solder to the short land before the flexible wire is disconnected from the connector on the CD pickup unit. (If the flexible wire is disconnected without applying solder, the CDpickup may be destroyed by static electricity.) In the assembly, be sure to remove solder from the short land after connecting the flexible wire.Pickup Solder part bMain boardFlexible wireShorting roundCN601 on mechanism P.C. boardUX-Z7MDR1-4 (No.22042)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 laserstrålning är denna del är öppnad och spårren ärurkopplad. Betrakta ej strålen.VAROAvattaessa ja suojalukitus ohitettaessa olet alttiina näkymät-tömälle lasersäteilylle. Älä katso säteeseen.ADVARSELUsynlig laserstråling ved åbning, når sikkerhedsafbrydere erude af funktion. Undgå udsasttelse for stråling.ADVARSELUsynlig laserstråling ved åpning, når sikkerhetsbryteren eravslott. unngå utsettelse for stråling.REPRODUCTION AND POSITION OF LABELSWARNING LABELDANGER : Invisibie laser radiation when open and interlock or defeated.AVOID DIRECT EXPOSURE TO BEAM (e)VARNING : Osynlig laserstrålning är denna del är öppnad och spårren ärurkopplad. Betrakta ej strålen. (s)VARO : Avattaessa ja suojalukitus ohitettaessa olet alttiina näkymättömälle lasersäteilylle.Älä katso säteeseen. (d)ADVARSEL :Usynlig laserstråling ved åbning , når sikkerhedsafbrydere er ude af funktion. Undgå udsættelse for stråling. (f)CLASS 1LASER PRODUCTUX-Z7MDR(No.22042)1-5SECTION 2Disassembly Method2.1 Main body2.1.1 Removing the metal cover (See Fig.1 to 3.)(1) Remove the six screws A on the rear part of the main bodythat attach the metal cover.(2) Remove the two screws B on each side of the main bodythat attach the metal cover.(3) Lift the rear part of the metal cover upward while releasingthe lower sides of the metal cover in the right and left direc-tion. The metal cover will be removed.Fig.1Fig.2Fig.3AAAMatal coverMatal coverBMatal coverBUX-Z7MDR1-6 (No.22042)2.1.2 Removing the CD mechanism assembly (See Fig.4 to 7.) Prior to this procedure, remove the metal cover.(1) Remove the card wire from the connector CN302 on ampboard on the left side of the main body.(2) Remove the three screws C on top of the body that attachthe CD mechanism assembly.(3) Lift the CD mechanism assembly upward and move itbackward to remove.(4) Remove the card wire from CN606 on CD servo board, onthe bottom of the CD mechanism assembly.Fig.4Fig.5Fig.6Fig.7CD mechanism ass'yAmp boardCN302CCCAmp boardCN302CD mechanism ass'yCD mechanism ass'yCD mechanism ass'y CD servo boardCN606UX-Z7MDR(No.22042)1-72.1.3 Removing the front panel(See Fig.8 to11.) Prior to this procedure, remove the metal cover and the CDmechanism assembly.(1) Remove the card wire from the connector CN705 on miconboard, in the center of the right side of the main body.(2) Remove the plastic rivet in the right side of the main bodythat attaches tuner board.(3) Remove the card wire from the connector CN301 on ampboard in the center of the left side of the main body.Remove the card wire from the connector CN704 on miconboard.Remove the wire from each connector CN703 and CN710respectively. (4) Remove the card wire from the connector CN452 on FLconnection board on top of the main body.(5) Remove the two screws D on the right and left sides of themain body that attach the front panel assembly.(6) Remove the two screws E on the bottom of the main bodythat attach the front panel assembly.(7) Remove the joint “a“ on the bottom of the main body andthe joint “b“ on the right and left sides respectively by usinga screwdriver. Remove the front panel assembly in thefront direction.Fig.8Fig.9Fig.10Fig.11Plastic rivetTuner boardFront panel ass'yDMicon boardCN705joint bDMicon boardCN704Front panel ass'yjoint bCN703CN710Amp boardCN301FL connect boardCN452Front panel ass'yMicon boardCN704CN710CN703EEjoint aFront panel ass'yUX-Z7MDR1-8 (No.22042)2.1.4 Removing the tuner board (See Fig.12.) Prior to this procedure, remove the metal cover.(1) Remove the card wire on the right side of the main bodyfrom the connector CN1 on the tuner board.(2) Remove the plastic rivet on the right side of the main bodythat attaches the tuner board.(3) Remove the two screws F on the rear side of the main bodythat attach the tuner board.Fig.122.1.5 Removing the rear cover (See Fig.13.) Prior to this procedure, remove the metal cover and the CDmechanism assembly.(1) Remove the two screws G on the rear side of the mainbody that attach the rear cover.Fig.132.1.6 Removing the fan(See Fig.14 to 16.) Prior to this procedure, remove the metal cover, the CD mech-anism assembly, and the rear cover.(1) Remove the wire from the connector CN603 on the MDconnect board in the right side of the main body.(2) Remove the four screws H on the rear side of the mainbody that attach the fan.(3) Move the fan bracket that attaches the fan from inside therear panel upward to remove the two fixing points “c“. Fanwill be detached at the same time.NoticeWhen attaching the fan, attach the two “e“ to the two “d“ re-spectively before pressing the fan with fan bracket.Fig.14Fig.15Fig.16CN1Tuner doardPlastic rivetFGGRear panelRear coverFan Rear panelHHMD connect boardCN603FanRear panel joint cjoint cFan blacketFanhole ehole ehook dhook dUX-Z7MDR(No.22042)1-92.1.7 Removing the rear panel (See Fig.17 to 20.) Prior to this procedure, remove the metal cover, the CD mech-anism assembly, and the rear cover.(1) Remove the wire from the connector CN603 on MD con-nect board on the right side of the main body.(2) Remove the eight screws F on the rear side of the mainbody that attach the rear panel.(3) Remove the two joint “f“ on the right and left bottom of therear panel.NoticeThe fan assembly will be kept attached to the rear panel.Fig.17Fig.18Fig.19Fig.20Rear panelMD connect doardCN603Rear panelFFFFFRear paneljoint fjoint fRear panelUX-Z7MDR1-10 (No.22042)2.1.8 Removing the MD mechanism assembly (See Fig.21 and 22.) Prior to this procedure, remove the metal cover, the CD mech-anism assembly, and the rear cover.(1) Remove the card wire from the connector CN601 on theMD connect board in the rear part of the MD mechanismassembly.(2) Remove the four screws H on the front side and the rearside that attach the MD mechanism assembly. Remove the MD mechanism assembly upward.Fig.21Fig.222.1.9 Removing the headphone board (See Fig.23 and 24.) Prior to this procedure, remove the metal cover, the CD mech-anism assembly, and the rear cover.(1) Remove the wire from the connector CN101 on the ampboard on the left side of the main body.(2) Remove the band that fixes the wire to the amp board. Re-move the wire from the two clamps in the bottom chassis.(3) Remove the screw I on the right side of the main body thatattaches the