JVC-MXS6-cs-sm 维修电路原理图.pdf

SERVICE MANUALCOMPACT COMPONENT MD SYSTEMNo.20887Nov. 2000COPYRIGHT 2000 VICTOR COMPANY OF JAPAN, LTD.MX-S6MDMX-S6MDSafety PrecautionsPreventing static electricityImportant for laser productsDisassembly methodAdjustment methodFlow of functional operation until TOC read (MD section)Maintenace of laser pickup (MD)Replacement of laser pickup (MD)Flow of functional operation until TOC read (CD section)Maintenance of laser pickup (CD)Replacement of laser pickup (CD)Description of major ICs1-21-31-41-51-311-371-381-381-391-401-401-4069Area SuffixUSUBUTSingaporeHong KongTaiwanCA-MXS6MDSP-MXS6MDSP-MXS6MDContentsRadioFans.CN 收音机爱 好者资料库MX-S6MD1-21. This design of this product contains special hardware and many circuits and components specially for safety purposes. For continued protection, no changes should be made to the original design unless authorized in writing by the manufacturer. Replacement parts must be identical to those used in the original circuits. Services should be performed by qualified personnel only.2. Alterations of the design or circuitry of the product should not be made. Any design alterations of the product should not be made. Any design alterations or additions will void the manufacturers warranty and will further relieve the manufacture of responsibility for personal injury or property damage resulting therefrom.3. Many electrical and mechanical parts in the products have special safety-related characteristics. These characteristics are often not evident from visual inspection nor can the protection afforded by them necessarily be obtained by using replacement components rated for higher voltage, wattage, etc. Replacement parts which have these special safety characteristics are identified in the Parts List of Service Manual. Electrical components having such features are identified by shading on the schematics and by ( ) on the Parts List in the Service Manual. The use of a substitute replacement which does not have the same safety characteristics as the recommended replacement parts shown in the Parts List of Service Manual may create shock, fire, or other hazards.4. The leads in the products are routed and dressed with ties, clamps, tubings, barriers and the like to be separated from live parts, high temperature parts, moving parts and/or sharp edges for the prevention of electric shock and fire hazard. When service is required, the original lead routing and dress should be observed, and it should be confirmed that they have been returned to normal, after re-assembling.5. Leakage currnet check (Electrical shock hazard testing)After re-assembling the product, always perform an isolation check on the exposed metal parts of the product (antenna terminals, knobs, metal cabinet, screw heads, headphone jack, control shafts, etc.) to be sure the product is safe to operate without danger of electrical shock.Do not use 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 current from each exposed metal parts of the cabinet , particularly any exposed metal part having a return path to the chassis, to a known good earth ground. Any leakage current must not exceed 0.5mA AC (r.m.s.)Alternate check methodPlug the AC line cord directly into the AC outlet. Use an AC voltmeter having, 1,000 ohms per volt or more sensitivity in the following manner. Connect a 1,500 10W resistor paralleled by a 0.15 F AC-type capacitor between an exposed metal part and a known good earth ground.Measure the AC voltage across the resistor with the AC voltmeter. Move the resistor connection to eachexposed metal part, particularly any exposed metal part having a return path to the chassis, and meausre the AC voltage across the resistor. Now, reverse the plug in the AC outlet and repeat each measurement. voltage measured Any must not exceed 0.75 V AC (r.m.s.). This corresponds to 0.5 mA AC (r.m.s.). 1. This equipment has been designed and manufactured to meet international safety standards.2. It is the legal responsibility of the repairer to ensure that these safety standards are maintained.3. Repairs must be made in accordance with the relevant safety standards.4. It is essential that safety critical components are replaced by approved parts.5. If mains voltage selector is provided, check setting for local voltage.Good earth groundPlace this probe on each exposedmetal part.AC VOLTMETER(Having 1000 ohms/volts,or more sensitivity)1500 10W0.15 F AC TYPE!Burrs formed during molding may be left over on some parts of the chassis. Therefore, pay attention to such burrs in the case of preforming repair of this system.RadioFans.CN 收音机爱 好者资料库MX-S6MD1-3Electrostatic discharge (ESD), which occurs when static electricity stored in the body, fabric, etc. is discharged, can destroy the laser diode in the traverse unit (optical pickup). Take care to prevent this when performing repairs.1.1. Grounding to prevent damage by static electricityStatic electricity in the work area can destroy the optical pickup (laser diode) in devices such as CD/MD players. Be careful to use proper grounding in the area where repairs are being performed. 1.1.1. Ground the workbench1. Ground the workbench by laying conductive material (such as a conductive sheet) or an iron plate over it before placing the traverse unit (optical pickup) on it.1.1.2. Ground yourself1. Use an anti-static wrist strap to release any static electricity built up in your body. 1.1.3. Handling the optical pickup1. In order to maintain quality during transport and before installation, both sides of the laser diode on the replacement optical pickup are shorted. After replacement, return the shorted parts to their original condition. (Refer to the text.)2. Do not use a tester to check the condition of the laser diode in the optical pickup. The testers internal power source can easily destroy the laser diode. 1.2. Handling 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 the replacement procedure in the text. Remove the anti-static pin when replacing the traverse unit. Be careful not to take too long a time when attaching it to the connector. 3. Handle the flexible cable carefully as it may break when subjected to strong force. 4. It is not possible to adjust the semi-fixed resistor that adjusts the laser power. Do not turn itConductive material (conductive sheet) or iron plate(caption)Anti-static wrist strapCN321CN451PickupSoldering partMain board Flexible boardSoldering partMD pickupCD pickupPreventing static electricityMX-S6MD1-4Important 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 laserradiation and is equipped with safety switches whichprevent 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.VARNING : Osynlig laserstrlning r denna del r ppnad och sprren r urkopplad. Betrakta ej strlen.VARO : Avattaessa ja suojalukitus ohitettaessa olet alttiina nkymttmlle lasersteilylle.l katso steeseen.ADVARSEL : Usynlig laserstrling ved bning , nr sikkerhedsafbrydere er ude af funktion. Undg udsttelse for strling.ADVARSEL : Usynlig laserstrling ved pning,nr sikkerhetsbryteren er avslott. unng utsettelse for strling.REPRODUCTION AND POSITION OF LABELWARNING LABELCLASS 1LASER PRODUCT!CAUTIONPlease use enough caution not to see the beam directly or touch it in case of an adjustment or operationcheck.DANGER : Invisibie laser radiation when open and interlock or defeated.AVOID DIRECT EXPOSURE TO BEAM (e)VARNING : Osynlig laserstrlning r denna del r ppnad och sprren r urkopplad. Betrakta ej strlen. (s)VARO : Avattaessa ja suojalukitus ohitettaessa olet alttiina nkymttmlle lasersteilylle.l katso steeseen. (d)ADVARSEL :Usynlig laserstrling ved bning , nr sikkerhedsafbrydere er ude af funktion. Undg udsttelse for strling. (f)MX-S6MD1-5Remove the four screws A on the back of the body.Remove the two screws B on both sides of the body.Lift up the rear part of the top cover while pulling both sides, then remove the top cover.1.2.3.Disassembly methodRemoving the top cover (See Fig. 1 and 2)Prior to performing the following procedure, remove the top cover.Disconnect the card wire from connector CN661 on the input board.Remove the four screws C on the upper side of the body.Remove the screw D on the left side of the body.Release the wires from the clamp on the right side of the CD changer mechanism assembly. Lift up the rear part of the CD changer mechanism assembly and pull out it from the front assembly.1.2.3.4.Removing the CD changer mechanism assembly (See Fig.3 to 5)Fig.1Fig.2Fig.3Fig.4Fig.5Top cover AAAAAACCBx2ATop cover CD changer mechanism assemblyCD changer mechanism assemblyCD changer mechanism assemblyClampInput boardFront panel assemblyCN661CCDMX-S6MD1-6Prior to performing the following procedure, remove the top cover.Disconnect the wire from connector CN603 on the input board and the card wire from CN801 on the microcomputer board.Remove the two screws E on the bottom of the body.Release the joint a on the bottom and the two joints b and c on the lower sides of the body using a screwdriver. Detach the front panel assembly toward the front.1.2.3.Removing the font panel assembly (See Fig.6 to 8)Prior to performing the following procedure, remove the top cover and the front panel assembly.Remove the nine screws F attaching the display board to the front panel assembly.Disconnect connector CN791 on the display board from the control board on the front panel assembly.1.2.Removing the display board (See Fig.9)Prior to performing the following procedure, remove the top cover, the front panel assembly and the display board.Remove the five screws G and the four screws H attaching the control board and the key board.1.Removing the control board / the key board (See Fig.10)When removing the control board and the key board respectively, unsolder each board.REFERANCE: Fig.8Front panel assemblyJoint aJoint bJoint cFront panel assemblyCN603CN801Microcomputer boardDisplay boardKey boardControl boardInput boardEEFGGGHHFFFFig.6Fig.7Fig.9Fig.10Front panel assemblyFront panel assemblySolderingFront panel assemblyCN791MX-S6MD1-7Prior to performing the following procedure, remove the top cover and the CD changer mechanism assembly.Disconnect the card wire from connectors CN511 on the main board.Remove the four screws I on both sides of the body.Pull out the MD changer mechanism assembly from behind upward while releasing the four joints d using a screwdriver.1.2.3.Removing the MD changer mechanism (See Fig.11 to 13 )Prior to performing the following procedure, remove the top cover.Disconnect the card wire from connector CN801 on the microcomputer board.Remove the screw D attaching the microcomputer board.Disconnect the lower connector CN391, CN392 and CN393 from the main board by pulling them.1.2.3.Removing the microcomputer board (See Fig.14)MD changer mechanism assemblyCN511Microcomputer boardCN801CN393CN392CN391Joints dIIDFig.11Fig.12Fig.13Fig.14MD changer mechanism assembly MD changer mechanism assemblyJoints dMX-S6MD1-8Prior to performing the following procedure, remove the top cover.Disconnect the wire from connector CN111 and CN112 on the tuner board.Remove the screw J on the side of the body.Remove the two screws K on the back of the rear panel.1.2.3.Removing the tuner board (See Fig.15 and 16)Prior to performing the procedure, remove the top cover.Remove the two screws L and the two screws L attaching the rear cover to the body.Remove the two screws K, M, N, O, and the screw P and Q respectively.Release the joint e on the lower left side of the rear panel.1.2.3.Remove the rear cover / the rear panel (See Fig.15 to 17)Prior to performing the procedure, remove the top cover, the rear cover, the rear panel and the tuner board.Disconnect the card wire from connector CN661 and the wire from CN603 on the input board.Remove the two screws R attaching the bracket and remove the bracket in the direction of the arrow.Disconnect the lower connector CN602, CN913 and CN922 from the main board. Disconnect the wire from CN691 on the input board.1.2.3.Removing the Input board (See Fig.18)To facilitate the procedure, remove the rear panel in advance.REFERANCE: CN111Rear coverCN661CN603Input boardCN691CN602CN913CN922Joint eTuner boardJKLLOQKMNRPFig.15Fig.16CN112Rear panelRear panelFig.17Fig.18LMX-S6MD1-9Prior to performing the procedure, remove the top cover, the CD changer mechanism assembly, the rear cover, the rear panel, the tuner board and the input board.Remove the four screws S attaching the bracket.Disconnect connector CN924 and CN394 from the main board.1.2.Removing the heat sink assembly (See Fig.19 and 20)Prior to performing the procedure, remove the top cover, the CD changer mechanism assembly, the rear cover, the rear panel, the tuner board, the input board and the heat sink assembly.Remove the two screws T or U attaching the regulator board and the amplifier board to the heat sink.1.Removing the regulator board / the amplifier board (See Fig.21)Heat sink assemblyHeat sink assemblyHeat sinkBracketCN924Main boardAmplifier boardRegulator boardCN394SUTSFig.19Fig.20Fig.21MX-S6MD1-10Prior to performing the procedure, remove the top cover, the CD changer mechanism assembly, the rear cover, the rear panel, the tuner board, the input board and the heat sink assembly.Disconnect the wire from connector CN911 on the main board and CN991 on the power transformer assembly.Disconnect the card wire from connector CN511 on the main board.Remove the four screws V attaching the main board.If necessary, unsolder the wire on the headphone board.1.2.3.4.Removing the Main board (See Fig.22)Prior to performing the procedure, remove the top cover, the CD changer mechanism assembly, the front panel assembly, the rear cover, the rear panel, the tuner board and the input board. Remove the screw X attaching the headphone board.If necessary, unsolder the wire on the headphone board.1.Removing the headphone board (See Fig.25)Prior to performing the following procedure, remove the top cover, the rear cover, the voltage selector.Remove the four screws W attaching the power transformer assembly.Pull out the power cord stoppe