Jvc-UXTB-30-Service-Manual电路原理图.pdf

SERVICE MANUALCOPYRIGHT © 2010 Victor Company of Japan, LimitedNo.MB7252010/3COMPACT COMPONENT SYSTEMMB72520103SERVICE MANUALUX-TB30B, UX-TB30E, UX-TB30EN, UX-TB30EVCOPYRIGHT © 2010 Victor Company of Japan, LimitedLead free solder used in the board (material : Sn-Ag-Cu, melting point : 219 Centigrade)TABLE OF CONTENTS1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-32 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-63 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-64 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-105 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10AX-UXTB30XT-UXTB30SP-UXTB30SP-UXTB301-2 (No.MB725)SPECIFICATIONDesigns & specifications are subject to change without notice.Amplifier unit (AX-UXTB30)Output Power 20 W per channel, min. RMS, driven into 6 at 1 kHz with no more than 10% total harmonic distortion.(IEC268-3)Speakers/Impedance 6 - 8 Player/tuner unit (XT-UXTB30)Tuner sectionFM tuning range 87.50 MHz - 108.00 MHzCD player sectionMeasurement Condition 2W, IEC-A weightedDynamic range 75 dBSignal-to-noise ratio 75 dBWow and flutter ImmeasurableTerminalsAUDIO IN Input sensitivity/Impedance 250 mV/50 kUSB MEMORY USB specification Compatible with USB 2.0 Full-SpeedCompatible device Mass storage classCompatible system FAT16, FAT32Output power DC 5 V 500 mAGeneralPower requirement AC 230 V , 50 HzPower consumption 50 W (at operation)1.00 W or less (on standby)Dimensions (approx.) Player/tuner unit 230 mm × 81 mm × 230 mm (W × H × D)Amplifier unit 230 mm × 81 mm × 243 mm (W × H × D)Mass (approx.) Player/tuner unit 1.70 kgAmplifier unit 2.94 kgSpeakers (SP-UXTB30)Type 2-way Bass reflexSpeaker units Tweeter 4 cm cone × 1Woofer 10 cm cone × 1Dimensions (approx.) 160 mm × 250 mm × 160 mm (W × H × D)Mass (approx.) 1.81 kg each(No.MB725)1-3SECTION 1PRECAUTION1.1 Safety 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 a“Leakage 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 0.15µF 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.). 1.2 Warning(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.1.3 CautionBurrs 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.1.4 Critical 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.MB725)1.5 Preventing 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 tester's internal power source can easilydestroy the laser diode. 1.6 Handling 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.1MConductive material(conductive sheet) or iron palate(caption)Anti-static wrist strap(No.MB725)1-51.7 Important for laser products1.CLASS 1 LASER PRODUCT 2.CAUTION : (For U.S.A.) Visible and/or invisible class II laser radiationwhen open. Do not stare into beam.(Others) Visible and/or invisible class 1M laser radiationwhen open. Do not view directly with optical instruments. 3.CAUTION : Visible and/or invisible laser radiation whenopen and inter lock failed or defeated. Avoid directexposure to beam.4.CAUTION : This laser product uses visible and/or 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 ableto 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 LABELS and PRINT!Please use enough caution not to see the beam directly or touch it in case of an adjustment or operationcheck. WARNING LABEL and PRINT1-6 (No.MB725)SECTION 2SPECIFIC SERVICE INSTRUCTIONSThis service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.SECTION 3DISASSEMBLY3.1 Amplifier unit (Used model is UX-TB30E)3.1.1 Removing the Top cover (See Fig.1, 2)(1) Tear off the Rubber foots. (See Fig.1)(2) Remove the four screws A attaching the Top cover. (SeeFig.1)Fig.1(3) Remove the five screws B and two screws C attaching theRear cover. (See Fig.2)Fig.23.1.2 Removing the Main board (See Fig.3, 4)(1) Disconnect the card wire from Display board connected toconnector CN303 of the Main board. (See Fig.3)(2) Disconnect the connector wires from Display board con-nected to connectors CN302 and CN305 of the Mainboard. (See Fig.3)(3) Disconnect the connector wires from Power transformerconnected to connectors CN1101 and CN1104 of the Mainboard. (See Fig.3)(4) Disconnect the connector wire from Rectifier board con-nected to connector CN402 of the Main board. (See Fig.3)(5) Remove the three screws D attaching the Main board. (SeeFig.3)Fig.3AARubber footBCDDCN303 CN302CN305CN402CN1101CN1104(No.MB725)1-7(6) Remove the three screws E attaching the Heat sink. (SeeFig.4)Fig.43.1.3 Removing the Rectifier board (See Fig.5)(1) Disconnect the connector wire from Power transformerconnected to connector CN1102 of the Rectifier board.(2) Remove the four screws F attaching the Rectifier board.Fig.53.1.4 Removing the Front panel (See Fig.6, 7)(1) Remove the two screws G attaching the Front panel. (SeeFig.6)Fig.6(2) Disengage two hooks a engaged both side of the Frontpanel. (See Fig.7)Fig.73.1.5 Removing the Display board (See Fig.8)(1) Remove the five screws H attaching the Display board.(2) Disconnect the connector wire from Volume board con-nected to connector CN702 of the Display board.Fig.83.1.6 Removing the Rectifier board (See Fig.9)(1) Remove the Volume knob.(2) Remove the two screws J attaching the Volume board.Fig.9EFFCN1102Ghook aCN702HHJJ1-8 (No.MB725)3.2 CD unit (Used model is UX-TB30E)3.2.1 Removing the Top cover (See Fig.1, 2)(1) Tear off the Rubber foots. (See Fig.1)(2) Remove the four screws A attaching the Top cover. (SeeFig.1)Fig.1(3) Remove the five screws B and two screws C attaching theRear cover. (See Fig.2)Fig.23.2.2 Removing the Front panel (See Fig.3, 4, 5)(1) Disconnect the connector wire from USB board connectedto connector CN603 of the CD board. (See Fig.3)(2) Disconnect the connector wire from Control board connect-ed to connector CN703 of the Equalizer board. (See Fig.3)Fig.3(3) Remove the two screws D attaching the Front panel. (SeeFig.4)Fig.4(4) Disengage two hooks a engaged both side of the Frontpanel. (See Fig.5)Fig.5A ARubber footBBCCN603CN703Dhook a(No.MB725)1-93.2.3 Removing the CD mechanism (See Fig.6, 7)(1) Disconnect the connector wire from Equalizer board con-nected to connector CN2701 of the CD door switch board.(See Fig.6)(2) Remove the four screws E attaching the CD mechanism.(See Fig.6)Fig.6(3) Turnover the CD mechanism, disconnect the card wirefrom pickup connected to connector CN905 of the CDboard. (See Fig.7)(4) Disconnect the connector wire from CD mechanism con-nected to connector CN907 of the CD board. (See Fig.7)Fig.73.2.4 Removing the CD board (See Fig.8)(1) Disconnect the card wire from Equalizer board connectedto connector CN702 of the CD board.(2) Disconnect the connector wire from Equalizer board con-nected to connector CN901 of the CD board.(3) Remove the three screws F attaching the CD board.Fig.83.2.5 Removing the Equalizer board (See Fig.9)(1) Remove the three screws G attaching the Equalizer board.Fig.93.2.6 Removing the Control board (See Fig.10)(1) Remove the five screws H attaching the Control board.Fig.103.2.7 Removing the USB board (See Fig.11)(1) Remove the two screws J attaching the USB board.Fig.11CN2701EECN905CN907CN702CN901FGHJ1-10 (No.MB725)SECTION 4ADJUSTMENTThis service manual does not describe ADJUSTMENT.SECTION 5TROUBLESHOOTINGThis service manual does not describe TROUBLESHOOTING.