JVC-UXS77-cs-sm 维修电路原理图.pdf

SERVICE MANUALCOPYRIGHT 2004 Victor Company of Japan, LimitedNo.MB2302004/5COMPACT COMPONENT SYSTEMMB23020045UX-S77TABLE OF CONTENTS1PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-32SPECIFIC SERVICE INSTRUCTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-63DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-74ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-355TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-39(SP-UXS77)(CA-UXS77)(SP-UXS77)Area suffixA - AustraliaUS - SingaporeUW - Brazil,Mexico,PeruUX - Saudi ArabiaUJ - U.S.MilitaryUN - AseanRadioFans.CN 收音机爱 好者资料库1-2 (No.MB230)SPECIFICATIONDesign and specifications are subject to change without notice.Amplifier sectionOutput PowerHIGH40 W (20 W+ 20 W) at 4 (10% THD)50 W (25 W+ 25 W) at 4 (10% MAX)LOW40 W (20 W+ 20 W) at 4 (10% THD)50 W (25 W+ 25 W) at 4 (10% MAX)Analog inputAUXSensitivity/Impedance (at 1 kHz)400 mV/47 k (at AUX LEVEL 1)200 mV/47 k (at AUX LEVEL 2)Digital outputDVD OPTICAL DIGITAL OUT -21 dBm to -15 dBm (660 nm 30 nm)VIDEO OUTColor systemNTSCVIDEO (composite)1 V(p-p)/75 S-VIDEOY (luminance):1 V(p-p)/75 C (chrominance, burst):0.286 V(p-p)/75 COMPONENT(Y):1 V(p-p)/75 (PB/PR):0.7 V(p-p)/75 Speaker Terminals4 - 16 OthersAV COMPU LINK 2 (3.5)Tuner sectionFM tuning range87.5 MHz - 108.0 MHzAM tuning range531 kHz - 1 710 kHz (at 9 kHz)530 kHz - 1 710 kHz (at 10 kHz)Disc player section Playable discDVD Video/DVD Audio/CD/VCD/SVCDCD-R/CD-RW (recorded in Audio CD/Video CD/ Super Video CD/ MP3/ WMA/JPEGformat)DVD-R/DVD-RW (recorded in video format)Dynamic range90 dBHorizontal resolution500 linesWow and flutterImmeasurableMP3 recording formatMPEG 1/2 Audio Layer 3Max. Bit rate320 kbpsCassette deck sectionFrequency responseNormal (type I): 50 Hz - 14 000 HzWow and flutter0.15% (WRMS)GeneralPower requirementAC 110 V / AC 127 V / AC 220 V - AC 230 V,(adjustable with the voltage selector), 50 Hz/60 HzPower consumption90 W (at operation)12 W (on standby)5.3 W (with deactivating the clock indication)Dimensions (approx.)175 mm 237 mm 375 mm (W/H/D)Mass (approx.)7.5 kgSpeakersType2-Way Bass-reflex typeSpeaker SystemsWoofer: 10 cm cone 1Power handling capacity Tweeter: 4 cm cone 1HIGH: 20 WLOW: 20 WImpedanceHIGH: 4 LOW: 4 Frequency range56 Hz - 40 000 HzSound pressure level84 dB/WmDimensions (approx.)145 mm 236 mm 205 mm (W/H/D)Mass (approx.)2.3 kg eachRadioFans.CN 收音机爱 好者资料库(No.MB230)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.MB230)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 laser products. 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 long atime 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 pickup unit. Apply solder to the short land sections before the flexible wire is disconnected from the connecto on the servo board. (If the flexiblewire is disconnected without applying solder, the 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 strapDVD pickupDVD changer mechanism assemblyShort land sections(No.MB230)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 CD,MD and DVD 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 defeated. 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 here in may result in hazardous radiation exposure.REPRODUCTION AND POSITION OF LABELSCAUTION : Visible and Invisible laser radiation when open and interlock failed or defeated.AVOID DIRECT EXPOSURE TO BEAM. (e)VARNING : Synlig ochosynling laserstrlning nr den ppnas och sprren rurkopplad. Betrakta ejstrlen. (s)VARO : Avattaessa ja suojalukitusohitettuna tai viallisena olet alttiina nkyvlle ja nkymttmllelasersteilylle. Vlt steenkohdistumista suoraan itseesi. (f)ADVARSEL : Synlig og usynliglaserstrling nr maskinen erben eller interlocken fejeler.Undg direkte eksponering til strling. (d)!Please use enough caution not to see the beam directly or touch it in case of an adjustment or operationcheck.CLASS 1LASER PRODUCTCAUTION : Visible and Invisible laser radiation when open and interlock failed or defeated.AVOID DIRECT EXPOSURE TO BEAM. (e)VARNING : Synlig ochosynling laserstrlning nr den ppnas och sprren rurkopplad. Betrakta ejstrlen. (s)VARO : Avattaessa ja suojalukitusohitettuna tai viallisena olet alttiina nkyvlle ja nkymttmllelasersteilylle. Vlt steenkohdistumista suoraan itseesi. (f)ADVARSEL : Synlig og usynliglaserstrling nr maskinen erben eller interlocken fejeler.Undg direkte eksponering til strling. (d)WARNING LABEL1-6 (No.MB230)SECTION 2SPECIFIC SERVICE INSTRUCTIONSThis service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.(No.MB230)1-7SECTION 3DISASSEMBLY3.1Main body section3.1.1Removing the side panels L/R (See Figs.1 to 4)(1) From the both sides of the main body, remove the fourscrews A attaching the side panels L/R. (See Figs.1 and 2)(2) From the back side of the main body, remove the twoscrews B and two screws C attaching the side panels L/Rto the rear cover and top cover. (See Fig.3)(3) From the bottom side of the main body, remove the twoscrews D attaching the side panels L/R. (See Fig.4)(4) Release the claws a of the side panels L/R in the directionof the arrow and remove the side panels L/R from the mainbody. (See Figs.1 and 2)Fig.1Fig.2Fig.3Fig.4Side panel LClaw aClaw aASide panel RClaw aClaw aASide panel LRear coverTop coverSide panel RCBCBDDSide panel LSide panel R1-8 (No.MB230)3.1.2Removing the top cover (See Figs.5 to 7) Prior to performing the following procedure, remove the sidepanels L/R.(1) From the back side of the main body, remove the screw Eattaching the top cover to the rear cover. (See Fig.5)(2) From the right side of the main body, disconnect the cardwires from the connectors CN790 and CN791 on the mainboard. (See Fig.6)(3) From the both sides of the main body, remove the twoscrews F attaching the top cover to the front panel assem-bly. (See Fig.7)(4) Release the claws b and remove the top cover from themain body in the direction of the arrow. (See Fig.7)Fig.5Fig.6Fig.7Rear coverTop coverETop CoverMain boardCN791CN790FFClaw bClaw bGClaw cClaw cFront panel assemblyBottom chassisTop coverTop cover(No.MB230)1-93.1.3Removing the front panel assembly (See Figs.7 to 10) Prior to performing the following procedures, remove the sidepanels L/R and top cover.(1) From the both sides of the main body, remove the twoscrews G attaching the front panel assembly to the bottomchassis. (See Fig.7)(2) From the top side of the main body, remove the screw H at-taching the earth wire on the shield case. (See Fig.8)Reference:When attaching the screw H, attach the earth wire withit. (See Fig.8)(3) From the left side of the main body, disconnect the cardwire from the connector CN700 on the main board. (SeeFig.9)(4) Disconnect the wire from the connector CN767 on the mainboard. (See Fig.9)(5) From the both and bottom sides of the main body, releasethe claws c and d attaching the front panel assembly. (SeeFigs.7 and 10)(6) Remove the front panel assembly from the main body inthe direction of the arrow. (See Fig.10)Fig.8Fig.9Fig.10Front panel assemblyShield caseEarth wireHMain boardWireCN767CN700Card wireFront panel assemblyFront panel assemblyClaw cClaw cClaw d1-10 (No.MB230)3.1.4Removing the rear cover (See Figs.11 and 12) Prior to performing the following procedures, remove the sidepanels L/R and top cover.(1) From the left side of the main body, cut off the tie band at-taching the barrier. (See Fig.11)(2) Disconnect the wire from the connector CN760 on the mainboard. (See Fig.11)(3) From the back side of the main body, remove the twelvescrews J and screw K attaching the rear cover. (SeeFig.12)(4) R