Jvc-UXG-5-Service-Manual电路原理图.pdf

SERVICE MANUALCOPYRIGHT © 2005 Victor Company of Japan, LimitedNo.MB4312005/8MICRO COMPONENT SYSTEMMB43120058UX-G5Lead free solder used in the board (material : Sn-Ag-Cu, melting point : 219 Centigrade)TABLE OF CONTENTS1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-32 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-43 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-54 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-155 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-18CA-UXG5 SP-UXG5SP-UXG5Area suffixA - AustraliaUS - SingaporeUP - KoreaUT - TaiwanUW - Brazil,Mexico,PeruUY - ArgentinaUJ - U.S.Military1-2 (No.MB431)SPECIFICATIONDesign and specifications are subject to change without notice.Amplifier section Output Power 100 W (50 W+50 W) at 6 (10% THD)Speakers Impedance 6 - 16 Audio Input AUX 400 mV/50 kTuner section FM tuning range 87.50 MHz - 108.00 MHzAM tuning range 531 kHz - 1 710 kHz (at 9 kHz)530 kHz - 1 710 kHz (at 10 kHz)CD player section Dynamic range 85 dBSignal-to-noise ratio 85 dBWow and flutter ImmeasurableCassette deck section Frequency response: Normal (type l) 60 Hz - 14 000 HzWow and flutter 0.15% (WRMS)General Power requirement AC 110 V - 127 V / 220 V - 240 V (adjustable with the voltage selector), 50 Hz/60 HzPower consumption 90 W (at operation)0.8 W (on standby)Dimensions (approx.) 175 mm × 232 mm × 412 mm (W/H/D)Mass (approx.) 6.6 kgSpeakers Type 2-way Bass reflexSpeaker units Woofer 10 cm cone × 1Tweeter 4 cm cone × 1Impedance 6 Dimensions (approx.) 144 mm × 231 mm × 201 mm (W/H/D)Mass (approx.) 2.0 kg each(No.MB431)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.MB431)SECTION 2SPECIFIC SERVICE INSTRUCTIONSThis service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.(No.MB431)1-5SECTION 3DISASSEMBLY3.1 Disassembly of Right plate left plate Top coverReplacement of the fuses and AMP TR .THMS RES. Transistor. 7808 IC.3.1.1 Replacing the fuses (See Fig.1) Prior to performing the following procedure, remover rightplate, left plate, top cover.(1) Replace the fuses inside.Caution:Be sure to use fuses with the specifiedFig.13.1.2 Replacing the AMP TR (See Fig.2) Prior to performing the following procedure, remove the rightplate, left plate, top cover.(1) Remove the four screws A from the heat sink betweenAMP TR four.(2) Remove the solder fixing the AMP TR.3.1.3 Replacing the THMS RES (See Fig.2) Prior to performing the following procedure, remove right plate,left plate, top cover.(1) Remove the one screw B from heat sink.(2) Remove the solder fixing THMS RES.Fig.23.1.4 Replacing the 7808 IC (See Fig.3)(1) Remove the two screws D from heat sink.(2) Remove the solder fixing transistor.Fig.3FUSEA B(TR)THMS RESD1-6 (No.MB431)3.1.5 Removing the transformer cover (See Fig.4)(1) Remove the ten screws E from top cover.(2) Take off transformer cover from rear plate.Fig.43.1.6 Removing the Right plate (See Fig.5)(1) Remove the two screws F.(2) Take off right plate from main body.Fig.53.1.7 Removing the Left plate (See Fig.6)(1) Remove the two screws G.(2) Take off left plate from main body.Fig.6SPEAKERS IMPEDANCE:6 16E ETransformercoverEEFRight plateGLeft plate(No.MB431)1-73.1.8 Removing the TOP COVER (See Fig.7 to 9)(1) Remove the two screws H1 (See Fig.7, 8).(2) Disengage the claws H2 on both side of the front cabinet(See Fig.7, 8).(3) Rotate top cover and let's away from main body (SeeFig.9).Caution:When you rotate top cover, must to slow raise, Don't to destroythe two claws of front cabinet.Fig.7Fig.8Fig.9H1Top coverH2H1H21-8 (No.MB431)3.1.9 Removing the main board (See Fig.10 to 13)(1) Remove the two screws J1. (See Fig.10)(2) Disconnect the FFC cable J2 from the connector CN661 onmain board. (See Fig.10)(3) Disconnect the FFC cable J3 from the connector CN402 onmain board. (See Fig.11)(4) Disconnect the FFC cable J4 from the connector CN681 onmain board. (See Fig.12)(5) Remove main board from AMP board after disconnect theconnector J319 and CN601. (See Fig.13)Fig.10Fig.11Fig.12Fig.13J1 J1J2J3J4J5(No.MB431)1-93.1.10 Removing the Power board (See Fig.14 to 16)(1) Remove the two screws K1 from CD MECH cover andpower board. (See Fig.14)(2) Remove the two screws K1 from rear plate and powerboard. (See Fig.14-1)(3) Disconnect the wire K2 from the connector CN102 on theAMP board. (See Fig.15)(4) Disconnect the two wire K3 from the connector CN901 andCN902. (See Fig.16)Fig.14Fig.14-1Fig.15Fig.16Power boardK1k1K2K31-10 (No.MB431)3.1.11 Removing the Rear plate assembly (See Fig.17 to 18)(1) Disengage the claws I1 on both sides of bottom plate. (SeeFig.17)(2) Disconnect the wire I2 from the connector CN105 on theAMP board. (See Fig.18)Fig.17Fig.183.1.12 Removing the fan (See Fig.19)(1) Removing the four screws M2.3.1.13 Removing the Tuner pack (See Fig.19)(1) Removing the two screws M1.Fig.19I1Rear plate assemblyI2M1M2M2 FanM2M2M1Tuner pack