JVC-XVNA7SL-cd-sm 维修电路原理图.pdf

SERVICE MANUALCOPYRIGHT 2002 VICTOR COMPANY OF JAPAN, LTD.No.A00362002/10XV-NA7SLDVD AUDIO/VIDEO PLAYERA0036200209XV-NA7SLTABLE OF CONTENTS1Important Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32Disassembly method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73Mechanism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114Adjustment method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 185Description of major ICs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 276Glossary of term and abbreviations(for AV Decoder section) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48RadioFans.CN 收音机爱 好者资料库XV-NA7SL3SECTION 1Important Safety Precautions1.1 Safety Precautions(1) This design of this product contains special hardware andmany circuits and components specially for safety purposes.For continued protection, no changes should be made to theoriginal design unless authorized in writing by themanufacturer. Replacement parts must be identical tothose used in the original circuits. Services should beperformed 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 byusing replacement components rated for higher voltage,wattage, etc. Replacement parts which have these specialsafety characteristics are identified in the Parts List of ServiceManual. Electrical components having such features areidentified by shading on the schematics and by ( )on the Parts List in the Service Manual. The use of a sub-stitute replacement which does not have the same safetycharacteristics as the recommended replacement partsshown in the Parts List of Service Manual may createshock, 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 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 reassembling.(5) Leakage shock hazard testing)After reassembling the product, always perform an isolationcheck on the exposed metal parts of the product (antennaterminals, knobs, metal cabinet, screw heads, headphonejack, control shafts, etc.) to be sure the product is safe tooperate 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 aLeakage Current Tester, measure the leakage currentfrom each exposed metal parts of the cabinet, particu-larly any exposed metal part having a return path to thechassis, to a known good earth ground. Any leakagecurrent must not exceed 0.5mA AC (r.m.s.). Alternate check methodPlug the AC line cord directly into the AC outlet. Use an ACvoltmeter having, 1,000 ohms per volt or more sensitivity inthe following manner. Connect a 1,500 ohm 10W resistorparalleled by a 0.15 F AC-type capacitor between anexposed 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 metal part,particularly any exposed metal part having a return path tothe chassis, and measure the AC voltage across theresistor. Now, reverse the plug in the AC outlet and repeateach measurement. Voltage measured any must notexceed 0.75 V AC (r.m.s.). This corresponds to 0.5 mA AC(r.m.s.). 1.2 Warning(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 lo-cal voltage.1.3 CautionBurrs formed during molding may be left over on someparts of the chassis. Therefore, pay attention to such burrs in the case of pre-forming repair of this system.1.4 Critical 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 the same typeand rating as specified by the manufacturer. (Except the JC version)RadioFans.CN 收音机爱 好者资料库XV-NA7SL41.5 Preventing 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.1.5.1 Grounding to prevent damage by static electricityStatic electricity in the work area can destroy the optical pickup (laser diode) in devices such as DVD 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 caneasily destroy the laser diode. 1.6 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 thereplacement procedure in the text. Remove the anti-static pin when replacing the traverse unit. Be careful not to take toolong a 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.XV-NA7SL51.7 Important for laser products (1) CLASS 1 LASER PRODUCT(2) DANGER : Invisible laser radiation when open and interlock failed or defeated. Avoid direct exposure to beam.(3) CAUTION : There are no serviceable parts inside the Laser Unit. Do not disassemble the Laser Unit. Replacethe complete Laser Unit if it malfunctions.(4) CAUTION : The compact disc player uses invisible laserradiation and is equipped with safety switches which prevent emission of radiation when the drawer is open andthe 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 ableto function.(6) CAUTION : Use of controls, adjustments or performanceof procedures other than those specified herein may resultin hazardous radiation exposure.CAUTIONPlease use enough caution not to see the beam directlyor touch it in case of anadjustment or operation check.VARNINGOsynlig laserstrlning r denna del r ppnasd och sprren rurkopplad. Betrakta ej strlen.VAROAvattaessa ja suojalulitus ohitettaessa olet alttiina nkymt-tmlle lasersateilylle. l katso steeseen.ADVARSELUsynlig laserstrling ved bning, nr sikkerhedsafbrydere erude af funktion. Undg udsasttelse for strling.ADVARSELUsynlig laserstrling ved pning, nr sikkerhetsbryteren eravslott. unng utsettelse for strling.XV-NA7SL61.8 Precautions for Service1.8.1Handling of Traverse Unit and Laser Pickup(1) 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) To replace the traverse unit, pull out the metal short pin for protection from charging.(5) When replacing the pickup, after mounting a new pickup, remove the solder on the short land which is provided at the centerof 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. 1.8.2Destruction 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 traverse unit or pickup, be sure to take the following electrostaticprotection:(1) Wear an antistatic wrist wrap.(2) With a conductive sheet or a steel plate on the workbench on which the traverse unit or the pick up is to be repaired, groundthe sheet or the plate.(3) After removing the flexible wire from the connector (CN101), short-circuit the flexible wire by the metal clip.(4) Short-circuit the laser diode by soldering the land which is provided at the center of the flexible wire for the pickup. After completing the repair, remove the solder to open the circuit.Please refer to Fig.8 of Disassembly method for details. XV-NA7SL7SECTION 2Disassembly methodThere is a part different from the photograph according to themodel and the destination though explains this disassemblymethod by using version for europe.2.1 Main body section2.1.1How to remove a top cover (See Figure 1)(1) Screw A attaches a top cover to the main part. Removethe two screws A from the both sides of the main part.(2) Screw B attaches the top cover to the main part. Removethe three screws B from the rear side of the main part.(3) Raise the both sides and lower part of the rear of the topcover, with opening them slightly in an outward direction.And the top cover will be removed.Fig.12.1.2How to remove a front panel assembly(See Figure 2, 3, and 4.) Please remove a top cover before removing a front panel as-sembly. Front panel assembly can be removed without removingmechanism assembly.(1) Insert a kind of screwdriver in a hole located in the left sideof mechanism assembly, and push a lever until it cannotbe inserted any further.(2) And then, a tray will come out. Remove the tray in an up-per direction, with slightly opening the lower part of fittingin an outward direction.(3) Screw C attaches LCD display & operation switch board tothe main part. Remove the screw C.(4) Extract a card wire from connector CN1 on LCD display &operation switch board.(5) Remove I screw that attach the front panel assembly to themain part.(6) Remove two hook as and two bs. Remove front panelassembly in a front direction.Fig.2Fig.3Fig.4XV-NA7SL82.1.3How to remove a rear panel (See Figure 5 and 6) Please remove a top cover before removing a rear panel.(1) Screw D attaches a rear panel to the main part. Removethe thierteen screws D.(2) Extract a power cord from socket P901 on a power supplyboard.(3) Remove two tie bands.Fig.5Fig.62.1.4How to remove a mechanism assembly & servo control board (See Figure 7 and 8) Please remove a top cover, a front panel assembly, and a rearpanel before removing a mechanism assembly & servo con-trol board.(1) Extract flat wire from connector JT911, JT912, and JT913on a power supply board.(2) Extract card wire from connector CN902 and CN704 on apower supply board and servo control & main board .(3) Screw E attaches servo control & main board to the mainpart. Remove one screw E.(4) Screw F attaches a mechanism assembly. Remove threescrews F.(5) Remove two hook cs. And then, remove servo control &main board with sliding it in a front direction.(6) Two card wires are connected to servo control & mainboard. Extract this card wire from CN201 and CN202 re-spectively.(7) A wire is connected to servo control & main board from apickup. Extract it from CN101.ATTENTION:At this time, please extract the wire after short-circuit-ed of two places on the wire in part d with solder. Please remove the solder two places of part d afterconnecting the wire with CN101 when reassembling.Fig.7Fig.8XV-NA7SL92.1.5How to remove a power supply board (See Figure 9 and 5) Please remove a top cover before removing a power supplyboard.(1) Extract flat wire from connector JT911, JT912, and JT913on a power supply board.(2) Extract card wire from connector CN902 on apower supplyboard.(3) Extract power supply cord from socket P901 on a powersupply board.(4) Remove one screw G that attaches a power supply boardand four screws D that attaches a power supply boardfrom the rear side.2.1.6How to remove a surround audio board (See Figure 10) Please remove a top cover before removing a surround audioboard.(1) Extract card wire from connector CN704 on a servo control& main board.(2) Remove two screws J that attaches a surround audioboard and two screws K that attaches a surround audioboard from the rear side.Fig.9Fig.5Fig.10XV-NA7SL102.1.7How to remove LCD display & operation switch board (See Figure 11, 12, and 13) Please remove a top cover and a front panel assembly beforeremoving LCD display & operation switch board.(1) Extract card wire and flat wire from connector CN2, CN3,and CN8 on LCD display board.(2) Remove four screws H that attach an operation switchboard, and then operation switch board.(3) Remove support button, LCD display board, and push but-ton in this order. When the main part is assembled, parts must be assem-bled in the following order:Push button LCD display board Side LED board Support button Operation switch board. After the operation switch board is attached to its place,let a card wire through a slit on the operation switchboard, and then insert it in CN2. (See Figure 11.)Fig.11Fig.12Fig.13XV-NA7SL11SECTION 3Mechanism3.1 Loading assembly section3.1.1Removing the clamper assembly (See Fig.1)(1