Jvc-XVD-721-BK-Service-Manual电路原理图.pdf

1-1XV-D721BKXV-D723GDSERVICE MANUALDVD AUDIO/VIDEO PLAYERNo.A0002Nov. 2000XV-D721BKXV-D723GDContentsSafety PrecautionsPreventing static electricityImportant for laser productsImportance Admistering point on the SafetyDisassembly methodAdjustment methodDescription of major ICs1-21-31-41-51-61-111-18COPYRIGHT 2000 VICTOR COMPANY OF JAPAN, LTD.This service manual is printed on 100% recycled paper.XV-D721BKXV-D723GDArea SuffixXV-D721BKJCEGESENEEArea SuffixXV-D723GDAJEGESENUFU.S.ACanadaGermanySpainNorthern EuropeRussian FederationUS MinitaryAustraliaU.S.AGermanySingaporeNorthern EuropeChinaBrazil,Mexico,Peru1-2XV-D721BKXV-D723GD1. 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.1-3XV-D721BKXV-D723GDPreventing static electricityElectrostatic 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 DVD 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 tester's 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 strapImportant 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 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 herein may result in hazardous radiation exposure.REPRODUCTION AND POSITION OF LABELSWARNING LABELCLASS 1LASER PRODUCTCLASS 1LASER PRODUCT!Please use enough caution not to see the beam directly or touch it in case of an adjustment or operationcheck.CAUTION - - LASER RADIATION WHEN OPEN.DO NOT STARE INTO BEAM.ATTENTION RAYONNEMENT LASER EN CAS DOUVERTURE.NE PAS REGARDER DANS LE FAISCEAU.- VORSICHT LASERSTRAHLUNG, WENN ABDECKUNG GEÖFFENET.NICHT IN DEN STRAHL BLICKEN.- ADVARSEL LASERSTRÅ LING VED Å BNING.SE IKKE IND I STRÅ LEN.- ADVARSEL LASERSTRÅ LING NÅ R DEKSEL Å PNES.STIRR IKKE INN I STRÅ LEN.- VARNING LASERSTRÅ LNING NÄR DENNA DEL ÄR ÖPPNAD.STRRA EJ IN I STRÅ LEN.VARO! AVATTAESSA OLET ALTTIINA LASERSÄTEILYLLE.ÄLÄ TUIJOTA SÄTEESEEN.- - ANALOGDIGITALFRONT CENTERSUBWOOFERPCM/STREAMAUDIO OUT AV COMPU LINKLEFTRIGHTLEFTRIGHTOPTICALCOAXIALVIDEO S-VIDEO YPB PR SCAN MODECOMPONENTVIDEO OUT525p 525i1AC INREAR1-4XV-D721BKXV-D723GD1-5XV-D721BKXV-D723GDXV-D721BK/XV-D723GD C/J ONLYFull Fuse Replacement MarkingGraphic symbol mark (This symbol means fast blow type fuse.)should be read as follows ;FUSE CAUTIONFOR CONTINUED PROTECTION AGAINST RISKOF FIRE, REPLACE ONLY WITH SAME TYPEAND RATING OF FUSES ;F901 : 1.6 A / 125 VF901 : 1.6 A / 125 VXV-721BK/XV-723GD C/J SEULEMENTMarquage Pour Le Remplacement Complet De FusiblePRECAUTIONS SUR LES FUSIBLESPOUR UNE PROTECTION CONTINUE CONTRE DES RISQUES D'INCENDIE, REMPLACER SEULEMENT PAR UN FUSIBLE DU MEME TYPE ;Le symbole graphique (Ce symbole signifie fusible de type a fusion rapide.)doit etre interprete comme suit ;Note : It's means “J“ for U.S.A. market model and “C“ for canada market model. Importance Admistering point on the Safety 1-6XV-D721BKXV-D723GDRemove the four screws A on each side of the body.Remove the two screws B on the back of the body.Remove the top cover from behind in the direction of the arrow while pulling the lower part of the sides.1.2.3.Disassembly methodRemoving the top cover (See Fig.1)Prior to performing the following procedure, remove the top cover.Remove the sixteen screws C on the back of the body.1.Removing the rear panel (See Fig.2)Prior to performing the following procedure, remove the top cover.Removing the fitting (See Fig.3 to 5)Lower the mechanism by moving the lever marked a in the direction of the arrow from the upside of the body (Refer to Fig.3).Manually eject the loading tray toward the front.Remove the fitting from the loading tray by releasing the joints b on the both sides of the fitting.Push and return the loading tray.1.2.3.4.To remove the front panel assembly and the DVD mechanism assembly, remove the fitting in advance.ATTENTION: Fig.1Fig.2Fig.3Fig.4Fig.5Top coverRear panelLever aLoading trayLoading trayBCCA 2A 2CCCCLoading trayFittingJoint bJoint b1-7XV-D721BKXV-D723GDPrior to performing the following procedure, remove the top cover and the fitting.Disconnect the card wire from connector CN818 on the regulator board.Turn back the body and remove the three screws D fixing the front panel assembly.Release the two joints c on both sides of the body and remove the front panel assembly toward the front.1.2.3.Removing the front panel assembly (See Fig.6 to 9)Fig.6Fig.7Fig.8Fig.9Regulator boardCN818Front panel assemblyFront panel assemblyJoint cJoint c(Bottom)DD1-8XV-D721BKXV-D723GDPrior to performing the following procedure, remove the top cover and the fitting.It is not necessary to remove the front panel assembly.Disconnect the card wire from connector CN816 and the harness from CN817 on the regulator board.Disconnect the card wire from connector CN701 on the video board.Disconnect the card wire from CN831 on the DSP board.Remove the four screws E and the DVD mechanism assembly by pulling out from the front panel assembly backward.1.2.3.4.Removing the DVD mechanism (See Fig.10)Prior to performing the following procedure, remove the top cover.It is not necessary to remove the rear panel.Disconnect the card wire from connector CN816 and CN818 and the harnesses from CN815,CN817 and CN711 on the regulator board.Remove the three screws F attaching the regulator board.Remove the two screws C on the rear panel.1.2.3.Removing the regulator board (See Fig.11 and 12)Fig.10Fig.11Fig.12Video boardCN701Regulator boardCN816Regulator boardDSP boardCN831DVD mechanism assemblyCN817CN816CN711 CN815CN817CN818Rear panelEEEFFFCCE1-9XV-D721BKXV-D723GDPrior to performing the following procedure, remove the top cover.Removing the video board (See Fig.13 and 14)Disconnect the harnesses from the connector CN711 on the regulator board.Disconnect the card wire from connector CN701 on the video board.Remove the five screws C on the rear panel.1.2.3.Removing the Audio board 1,2 and 3 / the Audio board (See Fig.13,15 and 16)It is not necessary to remove the rear panel.Ref. :Prior to performing the following procedure, remove the top cover and rear panel.Remove the three screws C attaching the audio board 1,2 and 3.Disconnect the audio board 1,2 and 3 from the audio board respectively.Disconnect the harnesses from connector CN815 on the regulator board. Disconnect the card wire from connector CN831 on the audio board.Remove the two screws G attaching the audio board.1.2.3.4.5.Fig.13Fig.14Fig.15Fig.16Regulator board Video board Audio board 3Audio board 2Audio board 1Audio board 1Audio board 2Audio board 3Audio boardAudio boardCN831CN815Rear panelCN711 CN701CCCGCCN8311-10XV-D721BKXV-D723GDPrior to performing the following procedure, remove the top cover and the DVD mechanism assembly.Removing the DVD servo board (See Fig.17)Turn over the DVD mechanism assembly and disconnect the card wire from connector CN102 and CN103 on the DVD servo board.Remove the two screws H attaching the DVD servo board. Move the DVD servo board in the direction of the arrow to release the two corner joints d.1.2.Removing the FL board / the power switch board (See Fig.18 and 19)Prior to performing the following procedure, remove the top cover and the front panel assembly.Remove the eight screws I and three screws J on the back of the front panel assembly. Remove the FL board and the power switch board at the same time.Disconnect the harness from connector CN903 on the FL board.1.2.Fig.17Fig.18Fig.19DVD mechanism boardCN103Joint d Joint dCN102DVD servo boardFL boardPower switch boardPower switch boardCN903 FL boardHIIIIJJH