JVC-MXJ680V-cs-sm 维修电路原理图.pdf

SERVICE MANUALCOPYRIGHT 2000 VICTOR COMPANY OF JAPAN, LTD.MX-J570VMX-J680VNo.20853Jul. 2000COMPACT COMPONENT SYSTEMMX-J570VMX-J680VSafety precautionsImportant for laser productsPreventing static electricityPrecautions at disassembling and parts replacementDisassembly methodAdjustment method1-21-31-41-51-61-29Diagnosis which uses extension wire methodFlow of functional operation until TOC readMaintenance of laser pickupReplacement of laser pickupDescription of major ICs 1-331-341-351-351-36ContentsArea SuffixUSUXSingaporeSaudi ArabiaSUPER VIDEOTAPE A/BFADEMUTINGON SCREENNEXTPREVRMSMXJ570V REMOTE CONTROLSLEEPECHOSOUNDMODEVOCALMASKINGRECSTART/STOPACTIVEBASS EX.SUBTITLEHIGHLIGHTFM MODESTILLV.INTROKEY CONTROLEach difference point Model CD/DECK/RECEIVERSPEAKER MX-J680V CA-MXJ680V MX-J570V CA-MXJ570VSP-MXJ570VSP-MXJ680VColorTray fittingSilverLight blueGraySilver & Blue Silver Champagne-goldChampagne-goldPanelNetFrontCOMPACTSUPER VIDEOCOMPACTDIGITAL VIDEOCOMPACTDIGITAL AUDIOThis illustration is MX-J570VRadioFans.CN 收音机爱 好者资料库MX-J570V/MX-J680V1-2Safety Precautions1. 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.). Warning1. 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!CAUTIONBurrs 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-J570V/MX-J680V1-3Important 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.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 LABELSWARNING LABELDANGER : 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)!CAUTIONPlease use enough caution not to see the beam directly or touch it in case of an adjustment or operationcheck.CLASS 1LASER PRODUCTMX-J570V/MX-J680V1-4Preventing static electricity1. Grounding to prevent damage by static electricity Electrostatic 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.2. About the earth processing for the destruction prevention by static electricity In the equipment which uses optical pick-up (laser diode), optical pick-up is destroyed by the static electricity of the work environment.Be careful to use proper grounding in the area where repairs are being performed. 2-1 Ground the workbench 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.2-2 Ground yourself Use an anti-static wrist strap to release any static electricity built up in your body. 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. 4. 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 strapAttention when traverse unit is decomposed1. Remove the disk stopper and T. bracket on the CD changer mechanism assembly. 2. Disconnect the harness from connector on the CD motor board.3. CD traverse unit is put up as shown in Fig.1. 4. Solder is put up before the card wire is removed from connector CN601 on the CD servo control board as shown in Fig. 2. (When the wire is removed without putting up solder, the CD pick-up assembly might destroy.) 5. Please remove solder after connecting the card wire with CN601 when you install picking up in the substrate.*Please refer to Disassembly method in the text for pick-up and how to detach the CD traverse mechanism. SolderingFig.1Fig.2CD changermechanism assemblyCD traverse unitFlexible cableMX-J570V/MX-J680V1-5Precautions at disassembling and parts replacementThis model is charged with electricity on the power boardeven if the power cord is unplugged. Therefore, always discharge electricity in accordance withthe steps given below before starting disassembling of the unit and/or replacement of parts.1.2.While referring to the disassembling steps, remove the metal cover and the CD changer mechanism.Set electrical resistances of 1kohm 1/4W to the places between the + and - terminals of the respective condensersC204 and C205 on the power board, and discharge electricityfor 4 5 seconds. Power boardC205C204MX-J570V/MX-J680V1-6Remove the six screws A attaching the metal cover on the back of the body.Remove the two screws B attaching the metal cover on both sides of the body.Remove the metal cover from the body by lifting the rear part of the cover.1.2.3.Disassembly methodRemoving the metal cover (See Fig.1 to 3)Do not break the front panel tab fitted to the metal cover.ATTENTION: Fig.1Fig.2Fig.3Metal coverAAAMetal coverBMetal coverBMX-J570V/MX-J680V1-7CD changer mechanism boardCD changer mechanism assemblyMain boardCN868CInput / output boardCN871CN870 Rear panelFront panel assemblyFig.5Fig.6Fig.4Front panel assemblyCD changer mechanism assembly Rear panelC Rear panelDGECD Optical digital outputterminal TW100 CN102Video CD board Bracket CLAW aFig.7HICD changer mechanism assemblyVideo CD boardFVideo out boardVideo CD board CLAW b CN100 CN101Prior to performing the following procedure, remove the metal cover.For the card wire connecting the CD changer mechanism board and the main board, disconnect it from connector CN868 on the main board.Remove the two screws C attaching the CD changer mechanism assembly on both sides of the body.Remove the two screws D attaching the CD changer mechanism assembly to the rear panel. Remove the screw E attaching the AUX terminal on the back of the body.Remove the screw F attaching the video out terminal on the back of the body. Then disconnect it from connector CN102 on the video CD board, and pull out the earth wire TW100 on the video CD board.Pull the top of rear panel and the front panel assembly outward respectively, then remove the CD changer mechanism assembly and video out board by lifting the rear part of the CD changer mechanism assembly.1.2.3.4.5.Removing the CD changer mechanism assembly (See Fig.4 to 6)Prior to performing the following procedure, remove the CD changer mechanism assembly.Reverse the CD changer mechanism assembly.Remove the two screws H attaching the bracket.Remove the screw I attaching the video CD board.Disconnect the card wire from connector CN100 and CN101 on the video CD board.At first, remove the claw a. Then remove the claw b while raising the video CD board in the direction of the arrow mark as figure. After removing the claw b, you can removing the video CD board by pulling it backward. 1.2.3.4.5.Removing the video CD board (See Fig.7)MX-J570V/MX-J680V1-8Prior to performing the following procedure, remove the metal cover and the CD changer mechanism assembly.Disconnect the card wire from connector CN865 on the main board and pull out the earth wire on the main board.Disconnect the card wire from connector CN315 on the input / output board.Disconnect the harness from connector CN912 on the input / output board.Disconnect the harness from connectors CN900 and CN901 on the relay board on the back of the front panel assembly respectively.Disconnect connector CN870 and CN871 on the input/output board from the main board respectively.Remove the four screws J attaching the front panel assembly on the bottom of the body.Release the two joints b and c on the lower part of the sides using a screwdriver, and remove the front panel assembly toward the front. 1.2.3.4.5.6.7.Removing the front panel assembly (See Fig.8 to 10)Front panel assemblyInput / output boardMain boardCN865Joint bCN315CN912CN871CN870Fig.9Fig.10Fig.8Relay boardCN900CN901Joint cMain boardCN865Front panel assemblyFront panel assemblyJEarth wireMX-J570V/MX-J680V1-9Disconnect the harness from connector CN900 and CN906 on the relay board on the back of the rolling panel assembly.Disconnect the harness from connector CN862, CN863, CN850, CN851 and CN815 on the main board respectively. Disconnect the card wire from connector CN880 on the main board.Disconnect the card wire from connector CN869 and the harness from CN883 and CN884 on the main board respectively.Remove the four screws M attaching the rolling panel assembly.Remove the rolling panel assembly toward you.1.2.3.4.5.Removing the rolling panel assembly (See Fig.12 and 13)For the harness which should be connected to connector CN869, CN883 and CN884 on the main board, get them through the slots under the rolling panel when reattaching the rolling panel assembly to the front panel (Refer to Fig.13)ATTENTION: Pull out the MIC volume knob from the front side.Remove the screw K attaching earth wire. then release the earth wire from the clamp on the upper part of the cassette mechanism assembly.Remove the two screws L attaching the microphone terminal board assembly. Remove the microphone terminal boar