Jvc-XVS-56-BK-Service-Manual电路原理图.pdf
SERVICE MANUALDVD VIDEO PLAYERNo.A0019Oct. 2001COPYRIGHT 2001 VICTOR COMPANY OF JAPAN, LTD.XV-S56BK / XV-S57SLXV-S56BK/XV-S57SLArea Suffix (XV-S57SL)B - U.K.E - Continental europeEN - Northern europeArea Suffix (XV-S56BK)E - Continental europeEN - Northern europeThis service manual is printed on 100% recycled paper.ContentsSafety precautions - 1-2Preventing static electricity - 1-3Precautions for service - 1-4Important for laser products - 1-5Disassembly method - 1-6Adjustment method - 1-15Troubleshooting - 1-18Description of major ICs - 1-22ModelXV-S56BKXV-S57SLBody colorBlackSilverEach difference pointXV-S56BK/XV-S57SL1-21. 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 current 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 each exposed metal part, particularly any exposed metal part having a return path to the chassis, and measure 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.In regard with component parts appearing on the silk-screen printed side (parts side) of the PWB diagrams, the parts that are printed over with black such as the resistor ( ), diode ( ) and ICP ( ) or identified by the “ “ mark nearby are critical for safety. When replacing them, be sure to use the parts of the same type and rating as specified by the manufacturer. (Except the J and C version)XV-S56BK/XV-S57SL1-3Preventing 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. 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. 1.1. 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.1.2. Ground yourself1. Use an anti-static wrist strap to release any static electricity built up in your body. 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. 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 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 strapXV-S56BK/XV-S57SL1-4Precautions for ServiceHandling of Traverse Unit and Laser Pickup1. Do not touch any peripheral element of the pickup or the actuator.2. The traverse unit and the pickup are precision devices and therefore must not be subjected to strong shock.3. Do not use a tester to examine the laser diode. (The diode can easily be destroyed by the internal power supply of the tester.)4. When replacing the pickup, after mounting a new pickup, remove the solder on the short land which is provided at the center of the flexible wire to open the circuit.6. Half-fixed resistors for laser power adjustment are adjusted in pairs at shipment to match the characteristics of the optical block.Do not change the setting of these half-fixed resistors for laser power adjustment.Destruction of Traverse Unit and Laser Pickup by Static ElectricityLaser diodes are easily destroyed by static electricity charged on clothingor the human body. Before repairing peripheral elements of the traverseunit or pickup, be sure to take the following electrostatic protection:1. Wear an antistatic wrist wrap.2. With a conductive sheet or a steel plate on the workbench on whichthe traverse unit or the pick up is to be repaired, ground the sheet or the plate.3. Pick-up's laser diode might be destroyed by static electricity, and put up solder to “Soldering part A“, please before extracting the card wire from connector (CN101). 4. Moreover, please remove solder from “Soldering part A“ after inserting the card wire in connector (CN101)at assembly. Servo controlboardSoldering part APlease refer to “Fig.4“ of “Disassemblymethod“ for details. Short circuitXV-S56BK/XV-S57SL1-5Important 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 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 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 PRODUCTCAUTION: Invisible laser radiation when open and interlock failed or defeated.AVOID DIRECT EXPOSURE TO BEAM. (e)ADVARSEL: Usynlig laser-stråling ved åbning, når sikkerhedsafbrydere er ude af funktion. Undgå udsæt-telse for stråling (d)VARNING: Osynlig laser- strålning när denna del är öppnad och spärren är urkopplad. Betrakta ej strålen. (s)VARO: Avattaessa ja suo-jalukitus ohitettaessa olet alttiina näkymättömälle lasersäteilylle. Älä katso säteeseen. (f)2VIDEO OUTCOMP.Y/CAVVIDEO OUTAC INDIGITAL OUTVIDEORIGHTS-VIDEOPCM / STREAMCOAXIALOPTICALAV COMPU LINKLEFTFRONTREARRIGHT LEFTSUBWOOFER CENTERAUDIO OUTXV-S56BK/XV-S57SL1-6CN701 CN961 Servo controlboardMain boardMechanismassemblyFig.3A x 2BCCCBBFig.1DDGGDCN703CN711CN702Fig.2Lug wireFastenerDisassembly methodRemoving the top cover (see Fig.1)Removing the mechanism assembly(see Fig.2,3)1.Remove the two screws A attaching the top coveron both sides of the body.2.Remove the three screws B attaching the top coveron the back of the body.3.Remove the top cover from the body by lifting therear part of the top cover.Removing the surround audio board(see Fig.1,2)* Prior to performing the following procedure, removethe top cover.1.Remove the three screws C attaching the surroundaudio board on the rear panel.2.Disconnect the card wire from CN711 on the surroundaudio board.3.The surround audio board is remove while pickingup the point of the fastener in two places.ATTENTION: Do not break the front panel tabfitted to the top cover.* Prior to performing the following procedure, removethe top cover.* There is no need to remove the front panel assembly.1.Remove the three screws D attaching the mechanismassembly on the bottom chassis.2.Remove the two screws G attaching the lug wire withmain board.3.The servo control board is removed from the connectorCN961 and CN701 connected with the main boardrespectively.4.Remove the mechanism assembly by lifting the rear partof the mechanism assembly.XV-S56BK/XV-S57SL1-7Removing the rear panel (see Fig.5)Removing the front panel assembly(see Fig.6,7)Removing the main board (see Fig.7)*Prior to performing the following procedure, removethe top cover.1.Remove the three screws C and nine screws E attaching the rear panel on the back of the body.* Prior to performing the following procedure, removethe top cover, mechanism assembly, surround audioboard and rear panel.1.Disconnect the wire from CN702 and CN703 on themain board respectively.2.Remove the four screws G attaching the main boardon the bottom chassis.ECEERear panelFig.5FHook cHook dHook dFront panelassemblyFig.6* Prior to performing the following procedure, removethe top cover.* There is no need to remove the mechanism assembly.1.Remove the one screw F attaching the front panelassembly on the bottom chassis.2.Disconnect the wire from CN702 and CN703 on themain board respectively.3.Hook c and d are removed respectively, and the frontpanel assembly is removed. Hook b Hook bServo controlboardFig.4Removing the servo control board(see Fig.4)* Prior to performing the following procedure, removethe top cover and mechanism assembly.1.Disconnect the card wire from connector CN201 andCN202 on the servo control board respectively.2.Disconnect the flexible wire from connector CN101on the servo control board from pick-up.ATTENTIONAt this time, please extract the wire after short-circuitedof two places on the wire in part a with solder. Please remove the solder two places of part a afterconnecting the wire with CN101 when reassembling. 3.Two places in hook b are removed, the servo controlboard is lifted, and it is removed. CN703CN702Fig.7GGGGXV-S56BK/XV-S57SL1-8Remove the four screws A attaching the clamper assembly.Move the clamper in the direction of the arrow to release the two joints a on both sides.1.2.Removing the clamper assembly (See Fig.1)Prior to performing the following procedure, remove the clamper assembly.Push b of the slide cam into the slot on the left side of the loading base until it stops.Draw out the tray toward the front.1.2.Removing the tray (See Fig.2 and 3)When reattaching, fit the clamper to the two joints a.ATTENTION: Before reattaching the tray, slide the part c of the slide cam to the right as shown in Fig.3.ATTENTION: Joint aJoint aAAA AFig.1Fig.2Fig.3PushbTrayClamper basePart cSlide camXV-S56BK/XV-S57SL1-9Prior to performing the following procedure, remove the clamper assembly and the tray.Remove the four screws B attaching the traverse mechanism assembly.1.Removing the traverse mechanism assembly (See Fig.4 and 5)Before reattaching the traverse mechanism assembly, pass the card wire extending from the spindle motor board through the notch d of the elevator.ATTENTION: Prior to performing the following procedure, remove the clamper assembly, the tray and the traverse mechanism assembly.Extend each bar e inside of the loading base outward and detach the elevator shaft.1.Removing the elevator (See Fig.6 and 7)When
