JVC-UXH10-cs-sm 维修电路原理图.pdf

SERVICE MANUALCOPYRIGHT 2004 VICTOR COMPANY OF JAPAN, LIMITEDNo.MB0662004/1MICRO COMPONENT SYSTEMMB06620041UX-H10TABLE OF CONTENTS1PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-32SPECIFIC SERVICE INSTRUCTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-53DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-64ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-125TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-16TIMER SETRANDOMSLEEPINTROSTANDBY/ONTIMERON/OFFREMAINBEAT CUTDISPLAY/CLOCK SETMUTINGRM-SUXH10U REMOTE CONTROLSOUND/BASSCDTAPECDVOLUMETUNER/BANDREPEATST/MONOPROGRAMSTANDBY/ONSTANDBYOPENVOLUMEMICRO COMPONENT SYSTEMUX-H10CD SYNCHRO RECORDINGArea SuffixUS - SingaporeUT -TaiwanUW - Brazil,Mexico,PeruRadioFans.CN 收音机爱 好者资料库1-2 (No.MB066)SPECIFICATIONDesign and specifications are subject to change without notice.Amplifier SectionCA-UXH10Output 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 10 kHz intervals 530 kHz- 1 710 kHzAM 9 kHz intervals531 kHz-1 710 kHzCD playerDynamic range60 dBSignal-to-noise ratio60 dBWow and flutterImmeasurableCassette deckFrequency responseNormal (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.)2.6 kgSpeaker SectionSP-UXH10TypeFull range bass-reflex typeSpeakers10 cm cone x1Power 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.MB066)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.MB066)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 on the CD servo board. (If theflexible 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 strap(No.MB066)1-5SECTION 2SPECIFIC SERVICE INSTRUCTIONSThis service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.1-6 (No.MB066)SECTION 3DISASSEMBLY3.1Main body3.1.1Removing the Front panel assembly (See Fig.1 5)(1) Remove the two screws A and the two screws B on theback of the body.(2) Remove the four screws C on each side of the body.(3) Remove the two screws D on the bottom of the body.(4) Move the front panel assembly in the direction of the arrowand detach. Disconnect the wire from connector CN860and FM-ANT.Caution:When reassembling, set the tab “a” on the right and left side tothe groove, and move.Fig.1Fig.2Fig.3Fig.4Fig.5ABCD mechanism assemblyCFront panel assemblyDFront panel assemblyJoint aJoint aFront panel assemblyCD mechanism assemblyFM-ANTCN860(No.MB066)1-73.1.2Removing the Main board (See Fig.6 , 7) Prior to performing the following procedure, remove the frontpanel assembly.(1) Disconnect the wire from all connectors on the main board.(2) Remove the two screws E and release the joint b.Fig.6Fig.7CN801CN851CN850CN370CN301CN601CN602CN260Main boardCD mechanism assemblyFront panel assemblyEMain boardCD mechanism assemblyFront panel assemblyJoint b1-8 (No.MB066)3.1.3Removing the CD mechanism assembly and the Switch board (See Fig.8 10) Prior to performing the following procedure, remove the frontpanel 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 CN705 on the CD mechanism board.(3) Remove the two screws F on the front panel assembly.(4) Release the joint d of the CD mechanism assembly.(5) Remove the five screws G attaching the switch board to theCD mechanism assembly.Fig.8Fig.9Fig.10BandFFBandCN705Open switch connecterCD mechanism assemblyFront panel assemblyJoint dCD mechanism assemblyFront panel assemblyGGSwitch boardCD mechanism assemblyFront panelassembly(No.MB066)1-93.1.4Removing the CD mechanism board (See Fig.11 13) Prior to performing the following procedure, remove the frontpanel assembly, the main board and the CD mechanismassembly.(1) Disconnect connector on the CD mechanism.(2) Remove the four screws H on the CD mechanismassembly.(3) Cut off the band setting each wire and disconnect the cardwire from connector on the CD mechanism.(4) Remove the screw J attaching the wire on the CDmechanism board.Caution:The metal washer and nut come off.(5) Remove the four screws K attaching the CD mechanism.Fig.11Fig.12Fig.13HHSwitch boardCD mechanism boardCD mechanism assemblyFront panelConnecterBandJBandConnecterCD mechanism assemblyNutCD mechanism boardKKCD mechanism assemblyCD mechanism1-10 (No.MB066)3.1.5Removing the Headphone board (See Fig.14) Prior to performing the following procedure, remove the frontpanel assembly, the main board and the CD mechanismassembly.(1) Remove the screw L on the bracket and pull out theheadphone board.Fig.143.1.6Removing the LCD board (See Fig.15) Prior to performing the following procedure, remove the frontpanel assembly, the main board and the CD mechanismassembly.(1) Remove the ten screws M and the two screws N on theFront panel assembly.Fig.153.1.7Removing the Cassette mechanism (See Fig.16) Prior to performing the following procedure, remove the frontpanel assembly and the main board.(1) Remove the four screws P on the front panel assembly andpress the eject button on the front side to remove thecassette mechanism assembly.Fig.16LHead phones boardHead phones bracket CD mechanism assemblySwitch boardFront panel assemblyLCD boardNMMMPPCassette mechanism assembly.(No.MB066)1-113.1.8Removing the Transformer board (See Fig.17) Prior to performing the following procedure, remove the frontpanel assembly.(1) Remove the screw Q on the rear cover assembly.(2) Pull out the transformer board in the direction of the arrow.(3) Unsolder the wire extending from the transformer.Fig.173.1.9Removing the Transformer (See Fig.18 , 19) Prior to performing the following procedure, remove the frontpanel assembly and the transformer board.(1) Remove the two screws R attaching the voltage selector onthe bottom of the rear cover assembly.(2) Remove the four screws S on the rear cover assembly.(3) Remove the two screws T setting the power cord on therear cover assembly.(4) Cut off the band connecting the power cord to thetransformer if necessary, remove the transformer.3.1.10 Removing the FM-antenna board (See Fig.19) Prior to performing the following procedure, remove the frontpanel assembly.(1) Remove the screw U on the rear cover assembly.(2) Unsolder the FM-antenna wire on the FM-antenna board.Fig.18Fig.19QTrans boradSolder pointRUTSSFM ANT boardSolder pointe Section1-12 (No.MB066)SECTION 4ADJUSTMENT4.1Measuring instructions required for adjustment(1) AM signal generator(2) FM signal generator(3) Intter mediate frequency sweep generater(4) FM stereo signal generator(5) Low-frequency oscillator (oscillation frequency 50 Hz-20kHz, 0dB output with 600 impeadance)(6) Attenuator (600 impeadance)(7) Electric voltmeter(8) Distotion meter(9) Torque guage (cassette for CTG-N)(10) Wow & flutter meter(11) Frequency counter meter4.1.1Amplifier sectionReference outputSpeaker output 0 dB(1V)/ 4 H. Phone output -10 dB(0.1V) 324.1.2CD sectionTest disc: JVC standard disc4.1.3Test tapeJVC standard test tape4.1.4Measuring instruments Radio sectionFM 1 kHz, 22.5 kHz deviationFM STEREO : 1kHz, 67.5 kHz deviationPilot signal: 7.5 kHzAM : 1 kHz, 30% modulationReference output:Speaker output : 0 dB (1V) 4 Headphone output : -10 dB (0.1V) 32 (No.MB066)1-134.1.5Cassette Amplifier Section Check and adjustment procedureStandard valueAdjusting partMeasuring ConditionItemHead azimuthadjustmentOutput level:Within 2 dB of maximum output levelPhase differenceL and Rchannels:Minimum Head azimuthadjustingscrew (To be used onlyafter headreplacement)See Fig 3-1Tapespeed:Motorsemifixedresister check