JVC-MXGA9V-cs-sm 维修电路原理图.pdf

SERVICE MANUALCOPYRIGHT 2003 VICTOR COMPANY OF JAPAN, LIMITEDNo.MB0112003/10COMPACT COMPONENT SYSTEMMB01120039MX-GA9VTABLE OF CONTENTS1PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-32SPECIFIC SERVICE INSTRUCTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-63DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-74ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-365TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-40COMPACTDIGITAL VIDEOCOMPACTDIGITAL AUDIOArea SuffixUX - Saudi ArabiaUN - AseanU - Other AreasRadioFans.CN 收音机爱 好者资料库1-2 (No.MB011)SPECIFICATIONAmplifier sectionOutput PowerSUB WOOFERS88 W per channel, min. RMS, both channels driven into 6 at 63 Hz with no more than 0.9% total harmonic distortion.MAIN SPEAKERS28 W per channel, min. RMS, both channels driven into 6 at 1 kHz with no more than 0.9% total harmonic distortion.Audio input sensitivity/Impedance (Measured at 1 kHz, with tape recording signal 300 mV)AUX390 mV/50 kMIC 1/23.0 mV/5 kDigital outputCD OPTICAL DIGITAL OUTPUTSignal wave length660 nmOutput level-15 dBm to -12 dBmSpeakers/ImpedanceSUB WOOFERS6 - 16 MAIN SPEAKERS6 - 16 SURROUND SPEAKERS16 - 32 TunerFM tuning range87.50 MHz - 108.00 MHzAM tuning rangeFor Saudi ArabiaAt 9 kHz intervals : 531 kHz - 1 602 kHzAt 10 kHz intervals : 530 kHz - 1 600 kHzFor other countriesAt 9 kHz intervals : 531 kHz - 1 710 kHzAt 10 kHz intervals : 530 kHz - 1 710 kHzCD playerCD capacity3 CDsDynamic range85 dBSignal-to-noise ratio90 dBWow and flutterImmeasurableCassette deckFrequency responseNormal (type I)50 Hz - 14 000 HzWow and flutter0.15% (WRMS)GeneralPower requirementAC 110 V / AC 127 V / AC 220 V / AC 230 V - AC 240 V(adjustable with the voltage selector), 50 Hz / 60 HzPower consumption170 W (at operation) 25 W (on standby)Dimensions (approx.)265 mm 335 mm 401 mm (W/H/D) (10 7/16 in. 13 1/4 in. 15 13/16 in.)Mass (approx.)10.0 kg (22.1 lbs)RadioFans.CN 收音机爱 好者资料库(No.MB011)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.MB011)1.5Preventing 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 CD players. 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 longa time 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 CD pickup unit. Apply solder to the short land sections before the flexible wire is disconnected from the connector on the CD servo board. (If theflexible wire is disconnected without applying solder, the CD 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 strapSolderingCD changermechanism assemblyCD traverse unitFlexible cable(No.MB011)1-51.8Important for laser products1.CLASS 1 LASER PRODUCT2.DANGER : Invisible laser radiation when open and inter lock failed or defeated. Avoid direct exposure to beam.3.CAUTION : There are no serviceable parts inside theLaser Unit. Do not disassemble the Laser Unit. Replace the complete Laser Unit if it malfunctions.4.CAUTION : The compact disc player uses 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 de feated. 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 herein may result in hazardous radiation exposure.REPRODUCTION AND POSITION OF LABEL and PRINTWARNING LABEL and PRINT!Please use enough caution not to see the beam directly or touch it in case of an adjustment or operationcheck.CLASS 1LASER PRODUCT1-6 (No.MB011)SECTION 2SPECIFIC SERVICE INSTRUCTIONSThis service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.(No.MB011)1-7SECTION 3DISASSEMBLY3.1Main body3.1.1Removing the metal cover (See Fig.1 3)(1) Remove the six screws A on the back of the body.(2) Remove the two screws B on both sides of the body.(3) Remove the metal cover from the body by lifting the rearpart of the cover.CAUTION:Do not break the front panel tab fitted to the metal cover.Fig.1Fig.2Fig.3AAAMetal coverMetal coverBMetal coverB1-8 (No.MB011)3.1.2Removing the CD changer mechanism assembly (See Fig.4 6) Prior to performing the following procedure, remove the metalcover.(1) Disconnect the wire from connector CN705 on the amplifierboard.(2) Remove the plastic rivet attaching the main board to thefront assembly on the right side of the body.(3) Disconnect the card wire from connector CN661 on themain board.(4) Remove the two screws C on the upper side of the bodyand the two screws D on the back of the rear panel.(5) Pull both the rear panel and the front panel assembly to theoutside, then remove the CD changer mechanism assem-bly by lifting the rear part of the assembly.REFERENCE:At this point, one card wire on the underside of the CDmechanism assembly is still connected.(6) Disconnect the card wire from connector CN504 on the in-ner side of the main board on the right side of the body. Re-move the CD mechanism assembly.CAUTION:To prevent damage to the CD fitting, be sure to pull both therear panel and the front panel assembly enough to remove theCD changer mechanism assembly.Fig.4Fig.5Fig.63.1.3Removing the fan (See Fig.7) Prior to performing the following procedure, remove the metalcover and the CD changer mechanism assembly.(1) Turn over the CD changer mechanism assembly and re-move the two screws E attaching the fan.Fig.7CD changer mechanism assemblyFront panel assemblyAmplifier boardCN705Rear panelFront panel assemblyCCCD changer mechanism assemblyRear panelMain boardCN661CN504CD changer mechanism assemblyDMain boardCN661Front panel assemblyRear panelCN504Plastic rivetFanEECD changer mechanism assembly(No.MB011)1-93.1.4Removing the front panel assembly (See Fig.8 11) Prior to performing the following procedure, remove the metalcover and CD changer mechanism assembly.(1) Disconnect the card wires from connector CN870, CN871and CN315 on the main board respectively.(2) Remove the wire clamp and disconnect the wire from con-nector CN703 on the amplifier board.(3) Disconnect the wire from connector CN220 on the trans-former board.(4) Remove the four screws F on the bottom of the body.(5) Release the two joints a on the lower right and left sides ofthe body using a screwdriver, and remove the front panelassembly toward the front.Fig.8Fig.9Fig.10Fig.113.1.5Removing the tuner board (See Fig.12) Prior to performing the following procedure, remove the metalcover.(1) Disconnect the card wire from connector CN1 on the tunerboard on the right side of the body.(2) Remove the plastic rivet fixing the tuner board.(3) Remove the two screws G on the back of the body.Fig.12Wire clampAmplifier boardCN703Main boardCN870CN871CN315Transformer boardCN220Front panel assemblyF(Bottom)(Bottom)(Bottom)Joint aFront panel assemblyFront panel assemblyJoint aCN1Plastic rivetTuner boardRear panelG1-10 (No.MB011)3.1.6Removing the rear cover / rear panel (See Fig.13 16) Prior to performing the following procedure, remove the metalcover and the CD changer mechanism assembly.(1) Remove the screw H attaching the rear cover on the backof the body.(2) Push each tab of the four joints b in the direction of the ar-row and release.(3) Remove the sixteen screws G attaching the rear panel.(4) Disengage the joints c on each lower side of the rear panelusing a screwdriver and remove the rear panel backward.Fig.13Fig.14Fig.15Fig.16Rear panelHJoint bJoint bRear coverGRear panelGGGGGJoint cRear panelJoint cRear panel(No.MB011)1-113.1.7Removing the main board (See Fig.17 19) Prior to performing the following procedure, remove the metalcover, the CD changer mechanism assembly, the rear paneland the antenna board.(1) Disconnect the card wires from connector CN870, CN871and CN315 on the main board.(2) Disconnect the wires from connector CN704 and CN706on the amplifier board.(3) Disconnect the wire from connector CN710 on the speakerboard.(4) Remove the screw I attaching the main board on the rightside ofthe body.(5) Disconnect connector CN211 and CN212 on the mainboard from the regulator board.3.1.8Removing the speaker board (See Fig.19) Prior to performing the following procedure, remov