JVC-MXC55C-cs-sm 维修电路原理图.pdf

SERVICE MANUALCOPYRIGHT 2006 Victor Company of Japan, LimitedNo.MB5082006/6COMPACT COMPONENT SYSTEMMB50820066MX-C55J,MX-C55CLead free solder used in the board (material : Sn-Ag-Cu, melting point : 219 Centigrade)TABLE OF CONTENTS1PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-32SPECIFIC SERVICE INSTRUCTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-53DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-64ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-105TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-11ECODISC SKIPSP-MXC55SP-MXC55CA-MXC55RadioFans.CN 收音机爱 好者资料库1-2 (No.MB508)SPECIFICATIONDesign and specifications are subject to change without notice.Amplifier sectionCA-MXC55Output PowerSUBWOOFERS170 W per channel, min. RMS, driven into 3 at 63 Hz with no more than 10% total harmonic distor-tionMAIN SPEAKERS 80 W per channel, min. RMS, driven into 6 at 1 kHz with no more than 10% total harmonic distor-tionAudio input sensitivity/Impedance(at 1 kHz, measured at MAIN SPEAKERS)AUX400 mV/47 kUSBUSB Version 1.1Speakers/ImpedanceSubwoofers3 - 6 Main speakers6 - 16 TunerFM tuning range87.50 MHz - 108.00 MHzAM tuning range530 kHz - 1 710 kHzCD playerCD Capacity3 CDsDynamic range85 dBSignal-to-noise ratio85 dBGeneralPower requirementAC 120 V , 60 HzPower consumption80 W /136 VA (at operation)7.3 W (on standby)1 W (in ECO mode)Dimensions (approx.)270 mm 317 mm 402 mm (W/H/D)(10 11/16 in. 12 1/2 in. 15 7/8 in.)Mass (approx.)5.9 kg (13 lbs)Speaker sectionSP-MXC55Type3-way bass-reflex typeSpeaker unitsSubwoofer16 cm (6 5/16 in.) cone 1Main Woofer10 cm (3 15/16 in.) cone 1Tweeter5 cm (2 in.) cone 1Power handling capacitySubwoofer170 WMain speaker80 WImpedanceSubwoofer3 Main speaker6 Frequency rangeSubwoofer30 Hz - 1 000 HzMain speaker100 Hz - 20 000 HzSound pressure levelSubwoofer74 dB/WmMain speaker81 dB/WmDimensions (approx.)220 mm 435 mm 316 mm (W/H/D)(8 11/16 in. 17 13/16 in. 12 1/2 in.)Mass (approx.)5.7 kg (12.6 lbs) eachRadioFans.CN 收音机爱 好者资料库(No.MB508)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.MB508)1.5Important for laser products1.CLASS 1 LASER PRODUCT 2.CAUTION : (For U.S.A.) Visible and/or invisible class II laser radiation when open. Do not stare into beam. (Others) Visible and/or invisible class 1M laser radiation when open. Do not view directly with optical instruments. 3.CAUTION : Visible and/or invisible laser radiation when open and inter lock failed or defeated. Avoid direct exposure 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 able to function. 6.CAUTION : Use of controls, adjustments or performance of procedures other than those specified here in may result in hazardous radiation exposure. !Please use enough caution not to see the beam directly or touch it in case of an adjustment or operationcheck. (No.MB508)1-5SECTION 2SPECIFIC SERVICE INSTRUCTIONSThis service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.1-6 (No.MB508)SECTION 3DISASSEMBLY3.1Main body section3.1.1Removing the top cabinet (See Figs.1 and 2)(1) From the both sides of the main body, remove the sixscrews A attaching the top cabinet. (See Fig.1.)(2) From the back side of the main body, remove the threescrews B attaching the top cabinet. (See Fig.2.)(3) Take out the top cabinet from the main body while lifting therear section of the top cabinet in the direction of the arrow.(See Fig.1.)3.1.2Removing the CD deck assembly (See Figs.2 to 4) Remove the top cabinet.(1) From the back side of the main body, remove the twoscrews B attaching the CD deck assembly to the rear cab-inet. (See Fig.2.)(2) From the bottom side of the CD deck assembly, turn thegear cam in the direction of the arrow and draw the traydisc out of the CD deck assembly in the direction of the ar-row 1. (See Figs.3 and 4.)(3) Remove the CD door from the tray disc in the direction ofthe arrow 2. (See Fig.4.)(4) From the left side of the main body, disconnect the wirefrom the connector CN103 on the main AMP board. (SeeFig.4)(5) Disconnect the card wire from the connector CW105 on theCD board. (See Fig.4)(6) From the both sides of the main body, remove the twoscrews D and then take out the CD deck assembly from themain body. (See Fig.4.)Fig.1Fig.2Fig.3Fig.4Top cabinetARear cabinetCBCD deckGear camOPENMain AMP boardDCD deck2CD boardCD doorTray disk1CN103CW105(No.MB508)1-73.1.3Removing the main AMP board (See Figs.5 to 7) Remove the top cabinet and CD deck assembly.(1) From the right side of the main body, remove the screw Eattaching the main AMP board to the main body. (SeeFig.5)(2) From the top side of the main body, disconnect the wirefrom the connector CN108 on the main AMP board. (SeeFig.6.)(3) Disconnect the card wire from the connector CN101 on themain AMP board. (See Fig.6.)(4) Disconnect the wire from the connector CN102 on the mainAMP board. (See Fig.6.)(5) Disconnect the wires from the connectors (SMCN01,SMCN02) on the SMPS board. (See Fig.6.)(6) From the back side of the main body, remove the threescrews G attaching the main AMP board to the rear cabi-net. (See Fig.7.)(7) Take out the main AMP board from the bottom cabinet.3.1.4Removing the SMPS board and rear cabinet (See Figs.6 to 8) Remove the top cabinet, CD deck assembly and main AMPboard.(1) From the top side of the main body, remove the screw F at-taching the earth wire on the bottom cabinet. (See Fig.6.)(2) From the back side of the main body, remove the threescrews H attaching the rear cabinet. (See Fig.7.)(3) Remove the sections a toward this side and take out therear cabinet. (See Fig.7.)(4) From the inside of the rear cabinet, remove the four screwsM attaching the SMPS board. (See Fig.8.)(5) Release the claw b and take out the SMPS board from therear cabinet assembly. (See Fig.8.)3.1.5Removing the fan motor (See Figs.7 and 8) Remove the top cabinet, CD deck assembly and main AMPboard.(1) From the back side of the main body, remove the twoscrews K attaching the fan motor to the rear cabinet. (SeeFig.7.)(2) Take out the fan motor from the rear cabinet. (See Fig.8.)Fig.5Fig.6Fig.7Fig.8Bottom cabinetMain AMP boardECN108SMCN101SMCN102SMPS boardBottom cabinetMain AMP boardCN101F CN102Rear cabinetGGHKHJaRear cabinetSMPS boardFAN motorMbbbM1-8 (No.MB508)3.1.6Removing the front cabinet assembly (See Figs.9 to 11) Remove the top cabinet and CD deck assembly.(1) From the top side of the main body, remove the screw N at-taching the earth wire on the bottom cabinet. (See Fig.9.)(2) Disconnect the card wire from the connector CN101 on themain AMP board. (See Fig.10.)(3) Disconnect the wire from the connector CN102 on the mainAMP board. (See Fig.10.)(4) From the both sides of the main body, remove the twoscrews P attaching the front cabinet assembly. (SeeFig.11.)(5) From the both and bottom sides of the main body, releasethe joints (c, d) and then take out the front cabinet assem-bly from the main body in the direction of the arrow. (SeeFigs.11.)Fig.9Fig.10Fig.11N Front cabinet assemblyBottom cabinetMain AMP boardCN101CN102Bottom cabinetPcddFront cabinet assembly(No.MB508)1-93.1.7Removing the VFD board (See Figs.12 and 13) Remove the top cabinet, CD deck assembly and front cabinetassembly.(1) From the front side of the front cabinet assembly, pull outthe two knobs. (See Fig.12.)(2) From the inside of the front cabinet assembly, remove theseven screws Q attaching the VFD board. (See Fig.13.)(3) Take out the VFD board from the front cabinet assemblyand then disconnect the wires from the connectors(UW101, UW201, FW102, FW104) on the VFD board. .(See Fig.13.)3.1.8Removing the front board (See Fig.12) Remove the top cabinet, CD deck assembly, front cabinet as-sembly and VFD board.(1) From the inside of the front cabinet assembly, remove thefour screws R attaching the front board.(2) Take out the front board from the front cabinet assembly.Fig.12Fig.13Front cabinet assemblyKnobRRQFront boardVFD boardFW104FW102UW201UW1011-10 (No.MB508)3.1.9Removing the USB board (See Fig.14) Remove the top cabinet, CD deck assembly, front cabinet as-sembly, Knobs and VFD board.(1) From the inside of the front cabinet assembly, remove thethree screws S attaching the USB board.(2) Take out the USB board from the front cabinet assembly.3.1.10 Removing the LED1 board, LED2 board and LED3board (See Fig.14) Remove the top cabinet, CD deck assembly, front cabinet as-sembly, knobs and VFD board.(1) From the inside of the front cabinet assembly, release theclaws e and then take out the LED1 board from the frontcabinet assembly.(2) Remove the screw T attaching the LED2 board.(3) Release the claw f and then take out the LED2 board fromthe front cabinet assembly.(4) Take out the LED3 board from the front cabinet assembly.Fig.14SECTION 4ADJUSTMENTThis service manual does not describe ADJUSTMENT.SSSTLED1 boardUSB boardLED2 boardLED3 boardef(No.MB508)1-11SECTION 5TROUBLESHOOTING5.1Amplifier5.1.1Power Malfunction5.1.2No OutputFront pcbu-com Vddnormal?SMPS pcbSMIC42 inputvoltage normal?check theSMIC01,SMD43Check amp PCSwire CN107Front pcb doseUX101(10MHz) oscillate?Front pcb p-sense voltagenormal?(#82)Check the SMPS SMD44Front pcb When the power onH pin no.94(UIC01)Replace u-COM IC(UIC01)CHECK the AMP PCBAIC01,FIC01,WIC01,WIC02YESYESYESYESYESNONONONONOAmp pcbAIC01,WIC01,02pin No.4,7,12,15B+ normal?Checkthe SMPSpcb SMIC02check theSMIC01,SMd43Check amp pcbwire CN107Amp pcbAIC01,pin No.51normal?(2.5 5V)Check amp pcbBIC02 pin #3,6,7voltage(3.0 5V)Amp pcbBIC01, pin No14normal?(3.3V)Replace ofBIC02Check themaster clock(12.288MHz)Check the FIC01NONONONOYESYESYESYES1-12 (No.MB508)5.1.3USB Malfunction5.1.4Compact Disc PlayerFront Jackpcb UIC03 pin#10voltage 5Vnormal?Front Jackpcb UIC03 pin #7voltage more than2.5V? or normal?Check the amp pcbFront pcbUIC02 pin #14voltage 5Vnormal?Front jack pcbJIC01 pin #14,15analog signalnormal?Check the amp pcbEIC0