JVC-MXGB6-cs-sm 维修电路原理图.pdf

SERVICE MANUALCOPYRIGHT 2004 VICTOR COMPANY OF JAPAN, LIMITEDNo.MB1602004/5COMPACT COMPONENT SYSTEMMB16020045MX-GB6, MX-GB5TABLE OF CONTENTS1PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-42SPECIFIC SERVICE INSTRUCTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-73DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-84ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-315TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-36SP-MXGB6SP-MXGB6SP-MXGB5SP-MXGB5CA-MXGB6CA-MXGB5J - - - - - - - - - - - - - - - - - - - - - - - - - - - - - U.S.A.C - - - - - - - - - - - - - - - - - - - - - - - - - - CanadaArea suffixRadioFans.CN 收音机爱 好者资料库1-2 (No.MB160)SPECIFICATIONAmplifier section-CA-MXGB6Speaker section-SP-MXGB6Design and specifications are subject to change without notice.Output Power SUBWOOFERS170 W per channel, min. RMS, driven into 6 at 63 Hz with no more than10% total harmonic distortion.MAIN SPEAKERS80 W per channel, min. RMS, driven into 4 at 1 kHz with no more than10% total harmonic distortion.Audio input sensitivity/Impedance(at 1 kHz, measured at MAIN SPEAKERS)AUX:400 mV/50 kSpeakers/Impedance Subwoofers6 - 16 Main speakers4 - 8 TunerFM tuning range87.50 MHz - 108.00 MHzAM tuning range530 kHz - 1 710 kHzCD playerCD Capacity3 CDsDynamic range85 dBSignal-to-noise ratio85 dBCassette deck Frequency response Normal (type I)50 Hz - 14 000 HzWow and flutter0.15% (WRMS)GeneralPower requirementAC 120 V , 60 HzPower consumption230 W (at operation)23.8 W (on standby)Dimensions (approx.)270 mm 317 mm 480 mm (W/H/D)(10 11/16 in. 12 1/2 in. 18 15/16 in.)Mass (approx.)10.5 kg (23.2 lbs)Type3-way bass-reflex typeSpeaker unitsSubwoofer20 cm (7 7/8 in.) cone 1Main Woofer12 cm (4 3/4 in.) cone 1Tweeter5 cm (2 in.) cone 1Power handling capacitySubwoofer170 WMain speaker80 WImpedanceSubwoofer6 Main speaker4 Frequency rangeSubwoofer25 Hz - 100 HzMain speaker100 Hz - 20 000 HzSound pressure levelSubwoofer75 dB/WmMain speaker82 dB/WmDimensions (approx.)233 mm 456 mm 360 mm (W/H/D)(9 3/16 in. 18 in. 14 3/16 in.)Mass (approx.)6.6 kg (14.6 lbs) eachRadioFans.CN 收音机爱 好者资料库(No.MB160)1-3Amplifier section-CA-MXGB5Speaker section-SP-MXGB5Design and specifications are subject to change without notice.Output Power SUBWOOFERS160 W per channel, min. RMS, driven into 6 at 63 Hz with no more than10% total harmonic distortion.MAIN SPEAKERS70 W per channel, min. RMS, driven into 4 at 1 kHz with no more than10% total harmonic distortion.Audio input sensitivity/Impedance(at 1 kHz, measured at MAIN SPEAKERS)AUX:400 mV/50 kSpeakers/Impedance Subwoofers6 - 16 Main speakers4 - 8 TunerFM tuning range87.50 MHz - 108.00 MHzAM tuning range530 kHz - 1 710 kHzCD playerCD Capacity3 CDsDynamic range85 dBSignal-to-noise ratio85 dBCassette deck Frequency response Normal (type I)50 Hz - 14 000 HzWow and flutter0.15% (WRMS)GeneralPower requirementAC 120 V , 60 HzPower consumption220 W (at operation)23.3 W (on standby)Dimensions (approx.)270 mm 317 mm 480 mm (W/H/D)(10 11/16 in. 12 1/2 in. 18 15/16 in.)Mass (approx.)10 kg (22.1 lbs)Type4-way bass-reflex typeSpeaker unitsSubwoofer16 cm (6 5/16 in.) cone 1Main Woofer16 cm (6 5/16 in.) cone 1Tweeter2 cm (13/16 in.) dome 1Midrange5 cm (2 in.) cone 1Tweeter2 cm (13/16 in.) dome 1Power handling capacitySubwoofer160 WMain speaker70 WImpedanceSubwoofer6 Main speaker4 Frequency rangeSubwoofer25 Hz - 90 HzMain speaker90 Hz - 20 000 HzSound pressure levelSubwoofer75 dB/WmMain speaker86 dB/WmDimensions (approx.)302.5 mm 325.5 mm 345 mm (W/H/D)(11 15/16 in. 12 7/8 in. 13 5/8 in.)Mass (approx.)6.6 kg (14.6 lbs) each1-4 (No.MB160)SECTION 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 anexposed 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 TYPE(No.MB160)1-51.5Preventing 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 testers internal power source can easilydestroy the laser diode. 1.6Handling 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.1.7Attention 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 unit connectorCard wirePickup unitconnectorShort land sectionCard wirePickup1-6 (No.MB160)1.8Importance administering point on the safetyCaution: For continued protection against risk offire, replace only with same type 5 A/250 VGB5(6.3 A/250 VGB6) for RFS2, 6.3 A/250 VGB5(8 A/250 VGB6) for RFS5 and RFS6, 8 A/250 Vfor RFS7 and RFS8, 5 A/250 V for RFS9.This symbol specifies type of fast operating fuse.Precaution: Pour eviter risques de feux, remplacezle fusible de surete de RFS2 comme le meme typeque 5 A/250 VGB5(6.3 A/250 VGB6),6,3 A/250 VGB5(8 A/250 VGB6) pour RFS5 etRFS6, 8 A/250 V pour RFS7 et RFS8, et5 A/250 V pour RFS9.Ce sont des fusibles suretes qui functionnes rapide.(No.MB160)1-7SECTION 2SPECIFIC SERVICE INSTRUCTIONSThis service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.1-8 (No.MB160)SECTION 3DISASSEMBLY3.1Main body section3.1.1Removing the top cabinet (See Figs.1 to 3)(1) From the back side of the main body, remove the threescrews A attaching the top cabinet. (See Fig.1.)(2) From the both sides of the main body, remove the sixscrews B attaching the top cabinet. (See Figs.2 and 3.)(3) Remove the top cabinet from the main body while lifting therear section of the top cabinet in the direction of the arrow.(See Figs.2 and 3.)Fig.1Fig.2Fig.3Top cabinetAAATop cabinetBBTop cabinetBB(No.MB160)1-93.1.2Removing the CD changer mechanism assembly (See Figs.4 to 10) Prior to performing the following procedures, remove the topcabinet.(1) From the bottom side of the CD changer mechanism as-sembly, turn the gear cam in the direction of the arrow anddraw the tray disc out of the CD changer mechanism as-sembly in the direction of the arrow 1. (See Figs.4 and 5.)(2) Remove the CD door assembly from the tray disc in the di-rection of the arrow 2 and push in the tray disc. (See Fig.5.)(3) From the left side of the main body, remove the spacers fix-ing the wire. (See Fig.5.)(4) From the right side of the main body, disconnect the wirefrom the connector CW104 on the main board. (See Fig.6.)(5) Disconnect the card wire from the connector CW105 on theCD sub board. (See Fig.6.)(6) From the back side of the main body, remove the fivescrews C attaching the heat sink cover. (See Fig.7.)Reference:It is not necessary to disconnect the wire of the fan mo-tor. (See Fig.8.)(7) Remove the two screws D attaching the CD changer mech-anism assembly. (See Fig.8.)(8) From the both sides of the main body, remove the twoscrews E attaching the CD changer mechanism assembly.(See Figs.9 and 10.)(9) Take out the CD changer mechanism assembly in the di-rection of the arrow 2 while extending the rear cabinet inthe direction of the arrow 1. (See Figs.9 and 10.)Fig.4Fig.5Fig.6CD changer mechanism assemblyGear camTray discCD door assemblyCD changer mechanism assemblySpacersWire12Card wireWireCD sub boardMain boardCW105CW1041-10 (No.MB160)Fig.7Fig.8Fig.9Fig.10Heat sink coverCCCWireDCD changer mechanism assemblyRear cabinet12ECD changer mechanism assemblyRear cabinet12E(No.MB160)1-113.1.3Removing the front cabinet assembly (See Figs.11 to 14) Prior to performing the following procedures, remove the topcabinet and CD changer mechanism assembly.(1) From the forward side of the main board, disconnect thecard wire from the connector CW101. (See Fig.11.)(2) Disconnect the wires from the connectors (CW01A,CW108, CW109, CW111, CW112) on the main board.(See Fig.11.)(3) From the top side of the main body, remove the screw F at-taching the earth wire. (See Fig.12.)(4) From the both sides of the main body, remove the twoscrews G attaching the front cabinet assembly. (SeeFigs.12 and 13.)(5) From the left side of the main body, remove the screw H at-taching the front cabinet assembly. (See Fig.13.)(6) From the bottom side of the main body, remove the screwJ attaching the front cabinet assembly. (See Fig.14.)(7) Release the two joints a and two joints b, remove the frontcabinet assembly in the direction of the arrow. (See Figs.12to 14.)Fig.11Fig.12Fig.13Fig.14Card wireWireWireWireWireWireCW101