JVC-UXP400-cs-sm 维修电路原理图.pdf

SERVICE MANUALCOPYRIGHT 2004 Victor Company of Japan, LimitedNo.MB2622004/6MICRO COMPONENT SYSTEMMB26220046UX-P400TABLE OF CONTENTS1PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-32SPECIFIC SERVICE INSTRUCTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-63DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-74ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-305TROUBLE SHOOTING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-31Area suffixUS - SingaporeUF - ChinaUP - KoreaUT - TaiwanUW - Brazil,Mexico,PeruCA-UXP400SP-UXP400SP-UXP400RadioFans.CN 收音机爱 好者资料库1-2 (No.MB262)SPECIFICATIONDesign and specifications are subject to change without notice.Amplifier sectionOutput Power40 W (20 W + 20 W) at 4 (10% THD)Speakers/Impedance4 - 16 Audio Input AUX400 mV/50 kTuner sectionFM tuning range87.50 MHz - 108.00 MHzAM (MW) tuning range531 kHz - 1 710 kHz (at 9 kHz intervals)530 kHz - 1 710 kHz (at 10 kHz intervals)CD player sectionDynamic range88 dBSignal-to-noise ratio93 dBWow and flutterImmeasurableCassette deck sectionFrequency responseNormal (type I):50 Hz - 14 000 HzWow and flutter0.15% (WRMS)SpeakersSpeaker units10 cm cone 1Impedance4 Dimensions (approx.)145 mm 230 mm 191 mm (W/H/D)Mass (approx.)1.8 kg eachGeneralPower requirementAC 110 V/AC 127 V/AC 220 V/AC 230 V - AC 240 V(adjustable with the voltage selector), 50 Hz/60 HzPower consumption50 W (at operation)4.4 W (on standby)Dimensions (approx.)170 mm 230 mm 311 mm (W/H/D)Mass (approx.)4.5 kgRadioFans.CN 收音机爱 好者资料库(No.MB262)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.MB262)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 strapCD pickupShort land sectionTraverse mechanism assemblyCD servo boardCN601Card wire(No.MB262)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.MB262)SECTION 2SPECIFIC SERVICE INSTRUCTIONSThis service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.(No.MB262)1-7SECTION 3DISASSEMBLY3.1Main body section3.1.1Removing the side panels L/R (See Figs.1 to 4)(1) From the back side of the main body, remove the fourscrews A attaching the side panels L/R to the rear panel.(See Fig.1.)(2) From the bottom side of the main body, remove the twoscrews B attaching the side panels L/R to the bottom chas-sis. (See Fig.2.)(3) From the both sides of the main body, release the engage-ment sections (a, b) of the side panels L/R from the topcover assembly in the direction of the arrow. (See Figs.3and 4.)(4) Remove the side panels L/R toward this side.Fig.1Fig.2Fig.3Fig.4Side panel RSide panel LRear panelAASide panel LBBBottom chassisSide panel RTop cover assemblyaaaSide panel RTop cover assemblybbbSide panel L1-8 (No.MB262)3.1.2Removing the front panel assembly (See Figs.5 to 8) Prior to performing the following procedures, remove the sidepanels L/R.(1) From the right side of the main body, push the slide camand pull the tray out of the main body in the direction of thearrow 1. (See Fig.5.)(2) Remove the tray fitting from the tray in the direction of thearrow 2. (See Fig.5.)(3) From the both sides of the main body, remove the twoscrews C attaching the front panel assembly. (See Figs.6and 7.)(4) Release the two claws c and claws d to draw out the frontpanel assembly in the direction of the arrow. (See Figs.6and 7.)(5) From the right side of the main body, disconnect the cardwire from the connector CN730 on the main board. (SeeFig.8.)(6) Disconnect the wire from the connector CN271 on the mainboard. (See Fig.8.)(7) Remove the front panel assembly in the direction of the ar-row. (See Fig.8.)Fig.5Fig.6Fig.7Fig.812Front panel assemblySlide camTrayTray fittingFront panel assemblyCcdFront panel assemblyCcdFront panel assemblyCN271Main boardCN730Card wireWire(No.MB262)1-93.1.3Removing the top cover assembly (See Figs.9 and 10) Prior to performing the following procedures, remove the sidepanels L/R and front panel assembly.(1) From the back side of the main body, remove the screw Dattaching the top cover assembly to the rear panel. (SeeFig.9.)(2) From the right side of the main body, disconnect the cardwires from the connectors (CN701, CN702) on the mainboard. (See Fig.10.)(3) Take out the top cover assembly from the main body.Fig.9Fig.10Top cover assemblyDRear panelTop cover assemblyCard wiresCN702CN701Main board1-10 (No.MB262)3.1.4Removing the cassette mechanism assembly (See Fig.11) Prior to performing the following procedures, remove the sidepanels L/R, front panel assembly and top cover assembly.(1) From the bottom side of the top cover assembly, discon-nect the card wires from the connectors (CN33, CN34) onthe head amp. & mechanism control board.(2) Remove the four screws E attaching the cassette mecha-nism assembly and take out the cassette mechanism as-sembly from the top cover assembly.Fig.11ECN34CN33Cassette mechanism assemblyHead amp. & mechanism control boardTop cover assemblyCard wiresE(No.MB262)1-113.1.5Removing the tuner (See Figs.12 and 13) Prior to performing the following procedures, remove the sidepanel L.(1) From the back side of the main body, remove the twoscrews F attaching the tuner to the rear panel. (SeeFig.12.)(2) Disconnect the card wire from the connector CN1 on thetuner. (See Fig.13.)Fig.12Fig.13FRear panelCard wireCN1Tuner1-12 (No.MB262)3.1.6Removing the rear panel (See Fig.14) Prior to performing the following procedures, remove the sidepanels L/R.(1) From the back side of the main body, remove the eightscrews G attaching the rear panel.(2) Release the engagement sections e and remove the rearpanel.(3) Disconnect the wire from the connector CN711 on the mainboard.Reference:After connecting the wire to the connector CN711, fix the wirewith the wire holder.3.1.7Removing the fan (See Figs.14 and 15) Prior to performing the following procedures, remove the sidepanels L/R and rear panel.(