Jvc-UXG-50-E-Service-Manual电路原理图.pdf

SERVICE MANUALCOPYRIGHT © 2006 Victor Company of Japan, LimitedNo.MB5092006/3MICRO COMPONENT SYSTEM MB50920063UX-G50J,UX-G50CLead 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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-74 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-145 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-15CA-UXG50 SP-UXG50SP-UXG501-2 (No.MB509)SPECIFICATIONDesign and specification are subject to change without notice.Amplifier section Output Power 120 W per channel, min. RMS, driven into 6 at 1 kHz with no more than 10% total har-monic distortion.Speakers Impedance 6 - 16 Audio Input AUX Input sensitivity/Impedance:LEVEL1:150 mV/47 kLEVEL2:500 mV/47 kUSB USB Ver. 1.1Tuner section FM tuning range 87.5 MHz - 108.0 MHzAM tuning range 530 kHz - 1 710 kHzCD player section Dynamic range 85 dBSignal-to-noise ratio 85 dBWow and flutter ImmeasurableGeneral Power requirement AC 120 V , 60 HzPower consumption 155 W (at operation)20 W (at standby)0.8 W (at on standby and Display off)Dimensions (approx.) 175 mm × 246 mm × 415 mm (6-15/16“ × 9-11/16“ × 16-3/8“) (W/H/D)Mass (approx.) 7.4 kg (16.4 lbs)Speakers Type 2-way Bass reflexSpeaker units Woofer 12 cm (4“) cone × 1Tweeter 4 cm (1-5/8“) cone × 1Impedance 6 Dimensions (approx.) 145 mm × 246 mm × 212 mm (5-3/4“ × 9-11/16“ × 8-3/8“) (W/H/D)Mass (approx.) 2.2 kg (4.9 lbs) each(No.MB509)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.MB509)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.1.7 Attention 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 strapPickup boardshort rand(No.MB509)1-51.8 Importance administering point on the safetyGraphic symbol mark (This symbol means fast blow type fuse.)FOR CONTINUED PROTECTION AGAINST RISKOF FIRE, REPLACE ONLY WITH SAME TYPEAND RATING OF FUSES ;should be read as follows ;F901 : 3.15A 250V F901 : 3.15A 250VFull Fuse Replacement MarkingFUSE CAUTIONLe symbole graphique (Ce symbole signifiefusible de type a fusion rapide.)POUR UNE PROTECTION CONTINUE CONTREDES RISQUES D'INCENDIE, REMPLACERSEULEMENT PAR UN FUSIBLE DU MEME TYPE ;Marquage Pour Le RemplacementComplet De FusiblePRECAUTIONS SUR LES FUSIBLESdoit etre interprete comme suit ;1-6 (No.MB509)SECTION 2SPECIFIC SERVICE INSTRUCTIONSThis service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.(No.MB509)1-7SECTION 3DISASSEMBLY3.1 Main body3.1.1 Removing the metal plate (See Fig.1 and 2)(1) Remove the six screws A attaching the metal plate fromback side of main body. (See Fig.1)(2) Remove the four screws B attaching the metal plate fromboth side of main body. (See Fig.2)3.1.2 Removing the top cover (See Fig.1 and 3)(1) Remove the one screw C attaching the top cover from backside of main body. (See Fig.1)(2) Remove the two screws D attaching the top cover fromboth side of main body. (See Fig.3)(3) Disengage hook a on both side of the front panel. (SeeFig.3)Fig.1Fig.2Fig.3ACABBDPacEarth wire1-8 (No.MB509)3.1.3 Removing the main board (See Fig.4)(1) Remove the two screws E attaching the main board. (SeeFig.4)(2) Disconnect the card wires connected to connector CN402,CN411, CN412, CN661 and CN681 of main board.(3) Disconnect the connector wire connected to connectorCN671 of main board.(4) Disconnect the board connector connected connectorCN501 and CN601 between amp board and main board.Fig.43.1.4 Removing the power board (See Fig.5 and 6)(1) Remove the two screws F attaching the power board. (SeeFig.5)(2) Disconnect the power cord connected connector CN901and power transformer connector wire connected connec-tor CN902 of power board. (See Fig.5)(3) Disconnect the connector wire connected connectorCN102 of amp board.(See Fig.6)Fig.5Fig.6EECN402 CN671 CN681CN411CN412 CN661CN601 CN501CN901CN902FCN102CN181(No.MB509)1-93.1.5 Removing the rear plate (See Fig.7 and 8)(1) Remove the four screws G attaching the trans cover. (SeeFig.7)(2) Remove the one screw H attaching the rear plate. (SeeFig.7)(3) Remove the two screws J attaching the speaker terminal.(See Fig.7)(4) Disengage hook b on both side of main chassis. (SeeFig.8)(5) Disconnect the connector wire from fan connected connec-tor CN105 of amp board.(See Fig.8)3.1.6 Removing the fan (See Fig.7)(1) Remove the four screws K attaching the fan.3.1.7 Removing the tuner pack (See Fig.7)(1) Remove the two screws L attaching the tuner pack.3.1.8 Removing the amp board (See Fig.6, 8 and 9)(1) Disconnect the connector wire connected to connectorCN181, CN204, CN205 and CN206 of the amp board. (SeeFig.6 and 8)(2) Remove the seven screws M attaching the amp board.(See Fig.9)Fig.7Fig.8Fig.9GJLGHKKbbCN105CN204 CN206CN205MM1-10 (No.MB509)3.1.9 Removing the front panel (See Fig.3 & 10)(1) Remove the two screws N attaching the front panel assem-bly. (See Fig.10)(2) Remove the two screws P attaching the front panel assem-bly. (See Fig.3)(3) Disconnect the earth wires from main chassis. (See Fig.3)(4) Disengage hook c on the both side of main chassis. (SeeFig.3)Fig.103.1.10 Removing the front board (See Fig.11)(1) Disconnect the connector wire connected connectorCN301 of front board.(2) Remove the four screws Q attaching the front board.3.1.11 Removing the key board (See Fig.11)(1) Disconnect the volume knob.(2) Remove the eleven screws R attaching the key board.3.1.12 Removing the USB board (See Fig.11)(1) Remove the four screws S attaching the USB board.Fig.113.1.13 Removing the power transformer (See Fig.12)(1) Remove the four screws T attaching the power transform-er.Fig.12NNQRRSQCN301TT