JVC-UXJ55V-cs-sm 维修电路原理图.pdf

SERVICE MANUALCOPYRIGHT 2003 VICTOR COMPANY OF JAPAN, LIMITEDNo.MB0572003/12MICRO COMPONENT SYSTEMMB057200312UX-J55VTABLE OF CONTENTS1PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-32SPECIFIC SERVICE INSTRUCTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-63DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-74ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-245TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-28SP-UXJ55VCA-UXJ55VSP-UXJ55V COMPACTDIGITAL VIDEOCOMPACTDIGITAL AUDIOCOMPACTDIGITAL VIDEOSTANDBY/ONDISPLAYCLOCK/TIMERSLEEPTREBLEUPBASSCANCELSETTAPEFM/AMAUXREPEATKARAOKERANDOMAHBPROSTILLMPXPRGMRETURN13246579810+10RM-DIGITALECHONEXTDOWNPREV./SELECTCDFMMODEREV.MODECDArea SuffixUS - SingaporeUN - AseanRadioFans.CN 收音机爱 好者资料库1-2 (No.MB057)SPECIFICATIONDesign and specifications are subject to change without notice.AmplifierOutput Power120 W (60 W + 60 W) at 6 (10% THD)Audio input sensitivity/Impedance (at 1 kHz)AUX400 mV/48 kSpeakers/Impedance6 - 16 TunerFM tuning range87.50 MHz - 108.00 MHzAM tuning rangeAM 10 kHz intervals530 kHz - 1 710 kHzAM 9 kHz intervals531 kHz - 1 710 kHzCD playerDynamic range85 dBSignal-to-noise ratio90 dBWow and flutterImmeasurableCassette deck Frequency responseNormal (type I)60 Hz - 14 000 HzWow and flutter0.15% (WRMS)SpeakerSP-UXJ55VSpeaker unitsWoofer12.0 cm cone 1Midrange4.0 cm cone 1Tweeter2.0 cm dome 1Impedance6 Dimensions (approx.)160 mm 285 mm 181.5 mm (W/H/D)Mass (approx.)2.4 kg eachGeneralPower requirementAC 110 V/ 127 V/ 220 V/ 230 V - 240 V , adjustable with the voltage selector, 50 Hz/60 HzPower consumption130 W (at operation)3.4 W (on standby)Dimensions (approx.)490 mm 286 mm 323.3 mm (W/H/D)Mass (approx.)10.3 kgRadioFans.CN 收音机爱 好者资料库(No.MB057)1-3SECTION 1PRECAUTION1.1Safety Precautions(1) This design of this product contains special hardware andmany circuits and components specially for safety purpos-es. For continued protection, no changes should be madeto the original design unless authorized in writing by themanufacturer. Replacement parts must be identical tothose used 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 specialsafety characteristics are identified in the Parts List of Ser-vice Manual. Electrical components having such featuresare identified by shading on the schematics and by ( ) onthe Parts List in the Service Manual. The use of a substitutereplacement which does not have the same safety charac-teristics as the recommended replacement parts shown inthe Parts List of Service Manual may create shock, fire, orother 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 reassem-bling.(5) Leakage shock hazard testingAfter reassembling the product, always perform an isola-tion check on the exposed metal parts of the product (an-tenna terminals, knobs, metal cabinet, screw heads,headphone jack, control shafts, etc.) to be sure the productis safe to operate without danger of electrical shock.Do notuse 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 anAC voltmeter having, 1,000 per volt or more sensitivityin the following manner. Connect a 1,500 10W resistorparalleled by a 0.15F AC-type capacitor between an ex-posed 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 metalpart, particularly any exposed metal part having a returnpath to the chassis, and measure the AC voltage acrossthe resistor. Now, reverse the plug in the AC outlet andrepeat each measurement. Voltage measured any mustnot exceed 0.75 V AC (r.m.s.). This corresponds to 0.5mA AC (r.m.s.). 1.2Warning(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.1.3CautionBurrs 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.1.4Critical 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 thesame type and rating as specified by the manufacturer. (This regulation dose not Except the J and C version)Good earth groundPlace this probe on each exposedmetal part.AC VOLTMETER(Having 1000 ohms/volts,or more sensitivity)1500 10W0.15 F AC TYPE1-4 (No.MB057)1.5Preventing static electricityElectrostatic discharge (ESD), which occurs when static electricity stored in the body, fabric, etc. is discharged, can destroy the laserdiode 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 CD 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. 1.6Handling 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 thereplacement procedure in the text. Remove the anti-static pin when replacing the traverse unit. Be careful not to take too longa time when 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.1.7Attention when traverse unit is decomposed*Please refer to Disassembly method in the text for the CD pickup unit. Apply solder to the short land sections before the flexible wire is disconnected from the connector CN601 on the CD servo board.(If the flexible wire is disconnected without applying solder, the CD 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.1MConductive material(conductive sheet) or iron palate(caption)Anti-static wrist strapCN601 onmechanismboardShorting roundShorting roundFlexible wire(No.MB057)1-51.8Important for laser products1.CLASS 1 LASER PRODUCT2.DANGER : Invisible laser radiation when open and inter lock failed or defeated. Avoid direct exposure to beam.3.CAUTION : There are no serviceable parts inside theLaser Unit. Do not disassemble the Laser Unit. Replace the complete Laser Unit if it malfunctions.4.CAUTION : The compact disc player uses invisible laser radiation and is equipped with safety switches which prevent emission of radiation when the drawer is open and the 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 able to function.6.CAUTION : Use of controls, adjustments or performance of procedures other than those specified herein may result in hazardous radiation exposure.REPRODUCTION AND POSITION OF LABEL and PRINTWARNING LABEL and PRINT!Please use enough caution not to see the beam directly or touch it in case of an adjustment or operationcheck.Caution label1-6 (No.MB057)SECTION 2SPECIFIC SERVICE INSTRUCTIONSThis service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.(No.MB057)1-7SECTION 3DISASSEMBLY3.1Main body3.1.1Removing the metal cover(See Fig.13)(1) Pull out the MIC volume knob on top of the body.(2) Remove the six screws A on the back of the main body.(3) Remove the two screws B on each side and remove themetal cover in the direction of the arrow.Fig.1Fig.2Fig.3Metal coverVolume knobAAABB1-8 (No.MB057)3.1.2Removing the rear cover(See Fig.4)(1) Remove the two screws D attaching the rear cover.Fig.4DRear cover(No.MB057)1-93.1.3Removing the rear panel / fan assembly(See Fig.5,6) Prior to performing the following procedure, remove the metalcover and the rear cover.(1) Remove the twelve screws E attaching the rear panel.Release the two joints a on the rear side and the two jointsb on each side.(2) Remove the two screws F attaching the fan bracket andrelease the two joints d on the rear panel, and remove.(3) Disconnect the wire from the connector CN908 on the mainboard.Reference:The MIC volume board comes off.3.1.4Removing the MIC volume board(See Fig.6) Prior to performing the following procedure, remove the metalcover, the rear cover and the rear panel.(1) Remove the two screws G attaching the MIC volume boardon the inside of the rear panel.(2) Disconnect the wire from connector CN906 on the mainboard on the back of the body.Fig.5Fig.6Rear panelFan assemblyEEEEEFEFddabbMain boardMic volum boardCN908CN906Rear panelG1-10 (No.MB057)3.1.5Removing the tuner board(See Fig.7) Prior to performing the following procedure, remove the metalcover.(1) Disconnect the card wire from the connector CN1 on thetuner board.(2) Remove the two screws H on the rear side and the screwJ in the side.Fig.73.1.6Removing the VCD mechanism assembly(See Fig.8) Prior to performing the following procedure, remove the metalcover, the rear cover, the rear panel and the tuner board.(1) Disconnect the card wire from the connector CN903,CN902 and CN904 on the main board.(2) Pull the joint e in the direction of the arrow and remove theVCD mechanism assembly backward while releasing thejoint f .Fig.8Tuner boardCN1HJCN902CN904CN903VCD mechanism assemblyMain boardeef(No.MB057)1-113.1.7Removing the main board / the heat sink board / the speaker board / the vocal cancel board(See Fig.911) Prior to performing the following procedure, remove the metalcover, the rear cover, the rear panel, and the VCD mechanismassembly.(1) Remove the two screws K attaching the main board.(2) Disconnect the card wire from the connector CN900,CN901,CN930,CN931 and CN932, and disconnect thewire from the connector CN907 and CN916,CN917 on themain board.(3) Remove the band and disconnect the wire from theconnector CN951 on the power transformer assembly, andthen remove the main board / the heat sink board from thebody.(4) Release the two joints g of the main board and disconnectthe connector CN944 and CN945 of the heat sink boardfrom the connector CN912 and CN911 of the main boardrespectively, and remove.(5) Remove the two screws L and the two screws M attachingthe heat sink.(6) Remove the screw N attaching the speaker board.(7) Disconnect the vocal cancel board from connector CN905on the main board.Fig.9Fig.10Fig.11HgMain boardPower transformer assemblyCN951CN930CN916CN900CN901CN917CN931CN907CN932BandMain boardCN905Vocal cancel boardCN944CN945CN912CN911CN905Heat sink boardMain boardVocal cancel boardSpeaker board1-12 (No.MB057)3.1.8Removing the power transformer assembly(See Fig.12) Prior to performing the following procedure, remove the metalcover, the rear cover, the rear panel, the VCD mechanismassembly and the main board.(1) Disconnect the power cord from the connector J1000 onthe power transformer assembly.(2) Remove the four screws P .Fig.12Power transformer assemblyJ1000PP(No.MB057)1-133.1.9Removing the front panel assembly(See Fig.13,14) Prior to performing the following procedure, remove the metalcover, the rear cover, the rear panel, and the VCD mechanismassembly.(1) Remove the two screws Q on each side. Release the twojoints h on the both sides and lift the front panel assemblyto release the joint j.(2) Disconnect the card wire from the connector CN900,CN901, CN930, CN931 and CN932 on the main board.Fig.13Fig.14QhFront panel assemblyQhjFront panel assemblyCN932CN931CN930CN900CN901Main board1-14 (No.MB057)3.1.10 Removing the phones board(See Fig.15) Prior to performing the following procedure, remove the metalcover, the rear cover, the rear panel, the VCD mechanismassembly and the front panel assembly.(1) Disconnect the wire from the connector CN913 on the mainboard.Fig.153.1.11 Removing the cassette mechanism assembly(See Fig.16) Prior to performing the following procedure, remove the frontpanel assembly.(