Jvc-UXG-3-Service-Manual电路原理图.pdf

SERVICE MANUALCOPYRIGHT © 2005 Victor Company of Japan, LimitedNo.MB4292005/7MICRO COMPONENT SYSTEMMB42920057UX-G3, UX-G4Lead 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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-165 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-19CA-UXG3 SP-UXG3SP-UXG3CA-UXG4 SP-UXG4SP-UXG4Area suffixUS - SingaporeUB - Hong KongUP - KoreaUT - TaiwanUW - Brazil,Mexico,PeruUY - ArgentinaUX-G3Area suffixUX-G4A - AustraliaUS - SingaporeUB - Hong KongUT - TaiwanUW - Brazil,Mexico,Peru1-2 (No.MB429)SPECIFICATIONDesign and specifications are subject to change without notice.Amplifier Section Output Power 25 W per channel, min. RMS, driven into 4 at 1 kHz with no more than 10% total harmonic distortion (IEC268-3).Audio input sensitivity/Impedance (at 1 kHz) AUX: 500 mV/50 kSpeakers Impedance 4 - 16 Tuner FM tuning range 50 kHz intervals 87.50 MHz-108.00 MHz100 kHz intervals 87.5 MHz-108.0 MHzAM tuning range 9 kHz intervals 531 kHz-1 710 kHz10 kHz intervals 530 kHz-1 710 kHzCD player Dynamic range 85 dBSignal-to-noise ratio 85 dBWow and flutter ImmeasurableCassette deck Wow and flutter 100 Hz - 10 000 HzWow and flutter 0.35% (WRMS)General Power requirement AC 110 V-127 V / AC 220 V-240 V (adjustable with the voltage selec-tor), 50Hz / 60HzPower consumption 52 W (at operation)3.0 W (on standby)Dimensions (W/H/D) (approx.) 152 mm × 233 mm × 331 mmMass (approx.) 4.7 kgSpeaker Section Type Full range, bass-reflex typeSpeakers 10 cm cone × 1Power handling capacity 25 WImpedance 4 Frequency range 100 Hz - 15 kHzDimensions (W/H/D) (approx.) 152 mm × 233 mm × 188 mmMass (approx.) 1.8 kg each(No.MB429)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.MB429)SECTION 2SPECIFIC SERVICE INSTRUCTIONSThis service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.(No.MB429)1-5SECTION 3DISASSEMBLY3.1 Main body3.1.1 Removing the front panel assembly (See Fig.1 to 6)(1) From the back of the body, remove the two screws A, thetwo screws B and the two screws D attaching the front pan-el assembly.(2) Remove the six screws E on both sides of the body.(3) Remove the screw F on the bottom of the body.(4) Move the front panel assembly in the direction of the arrowand remove. Disconnect the wire from connector CN102,CN402, CON801 on the main board.Caution:When reassembling the front panel assembly, fit the right andleft joints a to the notch.Fig.1Fig.2CD mechanism assemblyRear cover assemblyBADFront panelh assemblyCD mechanism assemblyRear cover assemblyE1-6 (No.MB429)Fig.3Fig.4Fig.5Fig.6Front panelh assemblyCD mechanism assemblyRear panel assemblyEFront panel assemblyRear panel assemblyFCD mechanism assemblyFront panel assemblyRear cover assemblyJoint aCD mechanism assemblyFront panel assemblyMain boardRear cover assemblyCN102CN402CON801(No.MB429)1-73.1.2 Removing the main board (See Fig.7, 8) Prior to performing the following procedure, remove the frontpanel assembly.(1) Disconnect the wire from all connectors on the main board.(2) Disconnect the wire from the two connectors on the cas-sette mechanism assembly.(3) Release the two bands attaching the wire to the mainboard.(4) Remove the two screws G from the front panel assembly.Release the joint b.Fig.7Fig.8CD mechanism assemblyCD mechanism assemblyFront panel assemblyCN203CN481Main boardCN303CN602CN301CN401CN102CN603CN103Main boardBandCD mechanism assemblyFront panel assemblyJoint bG1-8 (No.MB429)3.1.3 Removing the CD mechanism assembly (See Fig.9, 10) Prior to performing the following procedure, remove the frontpanel assembly and the main board.(1) Remove the three bands attaching the wire.(2) Disconnect the connector from the CD door switch. Discon-nect the wire from connector CN603 and CN606 on the CDmechanism board.(3) Disconnect the wire soldered on the CD mechanism board.(4) Remove the three screws H attaching the CD mechanismassembly.(5) Release the joints d to remove the CD mechanism assem-bly from the front panel assembly.Fig.9Fig.10CD mechanism assemblyCD door switchCD mechanism boardFront panel assemblyCN603CN606BandBandBandHHHCD mechanism assemblyFront panel assemblyJoint dJoint dCN603,CN606bandwire(No.MB429)1-93.1.4 Removing the CD mechanism assembly (See Fig.11 to 13) Prior to performing the following procedure, remove the frontpanel assembly, the main board and the CD mechanism as-sembly.Caution:Before disconnecting the card wire from connector CN601 onthe CD mechanism board and from CD pickup board, solderthe short-circuit point on the CD pickup board. If you do not fol-low this instruction, the pickup may be damaged.(1) Disconnect the wire from connector on the CD motorboard.(2) Remove the four screws J attaching the CD mechanismboard.(3) Move the CD mechanism board temporarily as shown inFig.12.(4) Remove the screw K attaching the wire to the CD mecha-nism.(5) Solder the short-circuit point on the CD pickup board.(6) Disconnect the card wire from connector CN601 on the CDmechanism board.Caution:Make sure to unsolder the short-circuit point after reconnectingthe card wire to the CD pickup board and to connector CN601on the CD mechanism board.Fig.11Fig.12Fig.13CD mechanism assemblyCD mechanism boardCN601WireJJCD mechanism assemblyCD motor boardCD mechanism boardwire Cord wireCN601Short-circuit pointKShort-circuit pointCard wireUnsolderCD pickup board1-10 (No.MB429)3.1.5 Removing the CD mechanism (See Fig.14) Prior to performing the following procedure, remove the frontpanel assembly, the main board, the CD mechanism assemblyand the CD mechanism board.(1) Remove the four screws M attaching the CD mechanism.Fig.143.1.6 Removing the headphone board/ AUX board (See Fig.15) Prior to performing the following procedure, remove the frontpanel assembly, the main board and the CD mechanism as-sembly.(1) Remove the screw N attaching the headphone board.(2) Remove the screw P attaching the AUX board.Fig.15CD mechanism assemblyCD mechanism MMFront panel assemblyAUX board Head phones board P N