JVC-UXG1-cs-sm 维修电路原理图.pdf

SERVICE MANUALCOPYRIGHT 2005 Victor Company of Japan, LimitedNo.MB4122005/6MICRO COMPONENT SYSTEMMB41220056UX-G1Lead free solder used in the board (material : Sn-Ag-Cu, melting point : 219 Centigrade)TABLE OF CONTENTS1PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-32SPECIFIC SERVICE INSTRUCTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-63DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-74ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-145TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-17 CA-UXG1 SP-UXG1 SP-UXG1 TIMER SETRANDOMSLEEPREPEATSTANDBY/ONTIMERON/OFFREMAINBEAT CUTDISPLAY/CLOCK SETMUTINGSOUND/BASSCDTAPECDVOLUMETUNER/BANDFM MODEPROGRAMREMOTE CONTROLSTANDBY/ONOPENVOLUMEMICRO COMPONENT SYSTEMCD SYNCHRO RECORDINGArea suffixUS - SingaporeUB - Hong KongUT - TaiwanUW - Brazil,Mexico,PeruUY - ArgentinaRadioFans.CN 收音机爱 好者资料库1-2 (No.MB412)SPECIFICATIONAmplifier Section-CA-UXG1Speaker Section-SP-UXG1Design and specifications are subject to change without notice.Output Power (IEC 268-3)10 W (5 W + 5 W) at 4 (10% THD)Speakers/Impedance4 - 16 TunerFM tuning range87.50 MHz-108.00 MHzAM tuning rangeAM 9 kHz intervals: 531 kHz-1 710 kHzAM 10 kHz intervals: 530 kHz-1 710 kHzCD playerDynamic range85 dBSignal-to-noise ratio85 dBWow and flutterImmeasurableCassette deck Frequency response Normal (type I) 100 Hz-10 000 HzWow and flutter0.35 % (WRMS)GeneralPower requirementAC 110 V-127 V/220 V-240 V adjustable with the voltage selector 50 Hz/60 HzPower consumption22 W (at operation)4.5 W (on standby)Dimensions (W/H/D) (approx.)145 mm 209 mm 226 mmMass (approx.)3.0 kgTypeFull range Bass-reflex typeSpeakers10 cm cone 1Power handling capacity5 WImpedance4 Frequency range100 Hz to 15 kHzDimensions (W/H/D) (approx.)135 mm 209 mm 152 mmMass (approx.)1.3 kg eachRadioFans.CN 收音机爱 好者资料库(No.MB412)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.MB412)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 pickup boardShort-circuit pointCard wireCD mechanism boardCN601(No.MB412)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.MB412)SECTION 2SPECIFIC SERVICE INSTRUCTIONSThis service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.(No.MB412)1-7SECTION 3DISASSEMBLY3.1Main body3.1.1Removing the Rear cover assembly (See Fig.1 to 5)(1) Remove the two screws A, the two screws B on the backof the body.(2) Remove the four screws D on each side of the body.(3) Remove the two screws E on the bottom of the body.(4) Move the front panel assembly in the direction of the arrowand remove. Disconnect the wire from connector CN901on the transformer board and FM-ANT connector CN203on the main board.Caution:When reassembling, set the joint a on the right and left side tothe groove, and move.Fig.1Fig.2Fig.3Fig.4Fig.5ABCD mechanism assemblyDFront panel assemblyEFront panel assemblyRear cover assemblyJoint aJoint aFront panel assemblyCD mechanism assemblyRear cover assemblyCN901Front panel assemblyRear cover assemblyTransformer boardMain boardCN203FM-ANT1-8 (No.MB412)3.1.2Removing the Main board (See Fig.6, 7) Prior to performing the following procedure, remove the rearcover assembly.(1) Disconnect the wire from all connectors on the main board.(2) Cut off the band setting the wire.(3) Remove the two screws F and release the joint b.Fig.6Fig.7CN801CN851CN850CN370CN301CN401CN402CN260Main boardCD mechanism assemblyFront panel assemblyFMain boardCD mechanism assemblyFront panel assemblyJoint b(No.MB412)1-93.1.3Removing the CD mechanism assembly and the Switch board (See Fig.8 to 10) Prior to performing the following procedure, remove the rearcover assembly and the main board.(1) Cut off the four bands setting the wires.(2) Disconnect the wire from connector on the CD open switchand CN603, CN606 on the CD mechanism board.(3) Remove the two screws G on the front panel assembly.(4) Release the joint d of the CD mechanism assembly.(5) Remove the five screws H attaching the switch board to theCD mechanism assembly.(6) Unsolder the switch board, if necessary.Fig.8Fig.9Fig.10CD mechanism boardCD mechanism assemblyOpen switch connecterCN603CN606Front panel assemblyBandBandBandGGJoint dCD mechanism assemblyFront panel assemblyOpen switch connecterCN603CN606HHSwitch boardCD mechanism assemblyFront panelassemblySolder point1-10 (No.MB412)3.1.4Removing the CD mechanism board, CD mechanism (See Fig.11 to 14) Prior to performing the following procedure, remove the rearcover assembly, the main board and the CD mechanism as-sembly.Caution:Make sure to solder the short-circuit point on the CD pickupboard before disconnecting the card wire from connectorCN601 on the CD mechanism board and from the CD pickupboard. If you do not follow this instruction, the pickup may bedamaged.(1) Remove the four screws J on the CD mechanism assem-bly.(2) Disconnect the wire from connector of the CD motor board.(3) Solder the short-circuit point on the CD pickup board, anddisconnect the wire from the CD pickup board.Caution:To reattach the CD mechanism board, connect the cardwire to connector CN601 on the CD mechanism boardand to the CD pickup board, then unsolder the short-cir-cuit point.(4) Remove the screw K attaching the wire on the CD mecha-nism board.Caution:The metal washer and nut come off.(5) Remove the four screws L attaching the CD mechanism.Fig.11Fig.12Fig.13Fig.14JJSwitch boardCD mechanism boardCD mechanism assemblyFront panelConnecterCD motor boardCN601CD pickup boardShort-circuit pointCard wireCD mechanism boardCN601CD mechanism assemblyCD motor boardconnecterCD mechanism boardConnecterNutKLLCD mechanism assemblyCD mechanism(No.MB412)1-113.1.5Removing the Headphone board (See Fig.15) Prior to performing the following procedure, remove the rearcover assembly, the main board and the CD mechanism as-s