JVC-UXM55-cs-sm 维修电路原理图.pdf

UX-M55No.21190Jan. 2003COPYRIGHT 2002 VICTOR COMPANY OF JAPAN, LTD.SERVICE MANUALContentsSafety precautionsPreventing static electricityImportant for laser productsDisassembly methodAdjustment methodFlow of functional operation until TOC read1-21-31-41-5 1-151-181-191-191-201-211-35Maintenance of laser pickupReplacement of laser pickupTrouble shootingDescription of major ICsWiring connectionsUX-M55 Area suffixE - Continental EuropeEN - Northern EuropeSP-UXM5CA-UXM55SP-UXM5MICRO COMPONENT SYSTEMDISPLAYMODEPHONESPROGRAMRECDIRECTIONPLAY/PAUSEPRE EQ/HBSVOLUMEREPEATSEARCH/TUNINGRANDOM CDTUNERTAPEBANDREV. MODEM I C R O C O M P O N E N T S Y S T E M U X - M 5 5AUTO REVERSEFULL LOGIC DECKTIMERON/OFFSETREMAIN/RDS MODEEJECTINTRO/RDSSEARCHOPEN/CLOSESTANDBY/ONST/MONOSTOP/CLEARPRESETC D - R / R W P L A YB A C KCD/RANDOMDISPLAYMODERECSLEEPTIMERPROGRAMMUTINGBEAT CUTPRE EQ/HBSSTANDBY/ON+VOLUMETUNER/BANDTAPE/REV.MODEINTRO/RDS SEARCHREMAIN/RDS MODEREPEATST/MONORM-SUXM5R REMOTE CONTROLPRE DOWNPRE UPRadioFans.CN 收音机爱 好者资料库UX-M551-21. 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 each exposed 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.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. (This regulation does not correspond to J and C version.)RadioFans.CN 收音机爱 好者资料库UX-M551-3Short landCD pickup unitConnectorConductive material (conductive sheet) or iron plate(caption)Anti-static wrist strap5. Attention when traverse unit is decomposed*Please refer to Disassembly method in the text for the CD pickup unit. Apply solder to the short land before the card wire is disconnected from the connector on the CD pickup unit. (If the card wire is disconnected without applying solder, the CDpickup may be destroyed by static electricity.) In the assembly, be sure to remove solder from the short land after connecting the card wire.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.Preventing static electricity1. 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. 2. About the earth processing for the destruction prevention by static electricityGround 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.2-1 Ground the workbench2-2 Ground yourselfUse an anti-static wrist strap to release any static electricity built up in your body. 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.)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. 3. Handling the optical pickup1.2. Do not subject the traverse unit (optical pickup) to strong shocks, as it is a sensitive, complex unit.Remove solder of the short land on the card wire 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.Handle the card wire carefully as it may break when subjected to strong force.It is not possible to adjust the semi-fixed resistor that adjusts the laser power. Do not turn it.4. Handling the traverse unit (optical pickup)1.2.3.4.UX-M551-4Important 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 LABELSWARNING LABEL!CAUTIONPlease use enough caution not to see the beam directly or touch it in case of an adjustment or operationcheck.CLASS 1LASER PRODUCTUX-M551-5Fig.3Fig.1Fig.2Fuse(F904)1.6A 250VFuse(F901)1.6A 250VPower boardFuse(F903)2.5A 250VAMain board (Reverse side)BCSoldered part aHeat sinkBracketPower amplifier IC(IC402)Main boardFuse(F902)2.5A 250V Replacing the fuses (See Fig. 1.)Remove the left side plate according to its disassembly method (see Figs. 6 and 7).Fuses are located inside the left side plate.Disassembly methodReplacement of the fuses and power amplifier ICCaution Be sure to replace the required fuses with designated ones. Replacing the power amplifier IC on the main board (See Figs. 2 and 3.)1.2.3.4.Remove the main board according to its disassembly method. (See Figs. 18 and 19.)From the reverse side of the main board, remove the two screws A retaining the bracket.(See Fig.2.)From the forward side of the main board, remove the four screws B retaining the bracket.(See Fig.3.)Remove the screw C attaching the power amplifier IC onto the heat sink. (See Fig.3.)In order to replace the power amplifier IC, remove the solder from the soldered part a on the reverse side of the main board. (See Fig.3.)UX-M551-61324DDEERight sideplateRight sideplateClaw bLeft sideplateClaw cFig.6DDEELeft sideplateFig.7Fig.5Fig.4Bottom caseBottom case Removing the right side plate(See Figs. 4 and 5.)1.2.From the right side of the main body, remove the three screws D and three screws E retaining the right side plate. (See Fig.4.)Slide the right side plate toward the rear (in the direction of the arrow 1) until the claw b at the back of the right side plate is hooked by the bottom case and then lift the right side plate upward (in the direction of the arrow 2) to remove it. (See Fig.5.) Removing the left side plate(See Figs. 6 and 7.)1.2.From the left side of the main body, remove the three screws D and three screws E retaining the left side plate. (See Fig.6.)Slide the left side plate toward the rear (in the direction of the arrow 3) until the claw c at the back of the left side plate is hooked by the bottom case, and then lift the left side plate upward (in the direction of the arrow 4) to remove it. (See Fig.7.)UX-M551-7121FTop cabinet(To be loosened)Rear cabinetFFig.9Fig.8Lift the rearpart to remove.Fig.10KFig.12Front cabinet assemblyHook dHook dBottom caseFig.11HJCD mechanismassemblyCN607HolderEarphoneboardConnector on thecassette switchboardConnector on thePB/REC head boardPower boardTie bandCN608CD mechanismassemblyHHJGCD & MCU boardCD & MCU board Removing the top cabinet(See Figs. 8 and 9.)1.2.From the back side of the main body, loosen the two screws F retaining the top cabinet. (See Fig.8.)Lift the rear part of the top cabinet to remove it. (See Fig.9.) Removing the front cabinet assembly(See Figs. 10 to 12.)1.2.3.4.5.6.7.8.From the left side of the main body, remove the tie band bundling the wires. (See Fig.10.)Disconnect the wire from the connector on the cassette switch board. (See Fig.10.)Remove the screw G retaining the holder on the earphone board. (See Fig.10.)Disconnect the wires from the two connectors CN607 and CN608 on the CD & MCU board.(See Figs.10 and 11.)Remove the four screws H and the two screws J retaining the CD mechanism assembly from the left and right. (See Figs.10 and 11.)Remove the screw K retaining the front cabinet assembly from the bottom side of the main body.(See Fig.12.)While opening the hooks d to the left and right of the lower part of the front cabinet assembly (in the direction of the arrows 1), slide the front cabinet assembly toward the front (in the direction of the arrow 2). (See Fig.12.)Disconnect the wire from the connector on the PB/REC head board, and then remove the front cabinet assembly. (See Fig.10.)Remove the left and right side plates.Remove the left and right side plates.Remove the top cabinet.Note After assembly, apply a locking agent to the screws G, H and J.UX-M551-8Fig.13LFig.14CD & MCU boardCD mechanism assemblyCD & MCU boardCD & MCU boardCN603CN701Tie bandsLFig.15Main boardCN601CN602Locking boardsupportCN902Power boardCN901Main boardLocking board supportsPower transformerTie bandsPower boardLug wireFig.16NMBottom caseLocking board supportRadio pliers, etc.Power boardFig.17Bottom caseCD rear mounting bracket Removing the CD mechanism assembly (See Figs. 13 to 15.)1.2.3.4.5.Remove the left and right side plates.Remove the top cabinet.Remove the front cabinet assembly.From the top side of the main body, disconnect the wires from the four connectors CN601, CN602, CN603 and CN701 on the CD & MCU board.(See Fig.13.)From the left side of the main body, remove the tie bands bundling the wires. (See Fig.14.)Disconnect the wire from the connector CN902 on the power board. (See Fig.14.)From the left and right sides of the main body, remove the four screws L retaining the CD rear mounting bracket. (See Figs.14 and 15.)Slide the CD mechanism assembly toward the front (in the direction of the arrow) and remove it from the locking board support of the main board.(See Fig.15.) Removing the power board (See Figs. 16 and 17.)1.2.3.4.5.Remove the left and right side plates.Disconnect the wires from the connector CN901 on the power board. (See Fig.16.)Remove the tie bands bundling the wires.(See Fig.16.)Remove the screw M retaining the lug wire.(See Fig.16.)Remove the two screws N retaining the bottom case. (See Fig.16.)Remove the power board by pinching the two locking board supports retaining the power board using radio pliers, etc. (See Fig.17.)UX-M551-9Fig.18Fig.19PRPQRTUBottom caseTie bandsCN901Power boardMain boardRegulator IC(IC302)Heat sinkAM antenna boardLocking board supportBracketSSRear cabinetFM antenna boardCN106CN104Wire clampEarth wire Removing the main board(See Figs. 18 and 19.)1.2.3.4.5.6.7.8.9.