JVC-MXK30-cs-sm 维修电路原理图.pdf

SERVICE MANUALCOMPACT COMPONENT SYSTEMNo.21084Oct. 2002COPYRIGHT 2002 VICTOR COMPANY OF JAPAN, LTD.MX-K30/MX-K10MX-K30/MX-K10ContentsSafety precautionsImportant for laser productsPreventing static electricityDisassembly methodAdjustment methodFlow of functionaloperation until TOC readMaintenance of laser pickupReplacement of laser pickupDescription of major ICs1-21-31-41-51-181-201-211-211-2228Area SuffixJU.S.A.CCanadaBASS-REFLEXBASS-REFLEXCD-R/RW PLAYBACK3-CDPLAY & EXCHANGEACTIVEBASS EX.CLOCK /TIMER?TAPE A / BCD 3CD 2CD 1COMPACT COMPONENT SYSTEM MX-K101 BIT DUAL D/ACONVERTERPROGRAMSOUND MODEREPEATPANDOMPRESETTUNINGSTANDBY/ONSTANDBYCANCELPHONESREC START / STOPCD REC STARTDUBBINGSET/ DEMOVOLUMEDISC SKIPROCKICLASSCPOPFM MODEFM /AMAUXSLEEPSTANDBY/ONCD1CD2CD3SOUNDMODEACTIVEBASS EX.FADEMUTINGVOLUMEPROGRAM/RANDOMREPEATTAPEA/BTAPECDCA-MXK10SP-MXK10CA-MXK30SP-MXK30SP-MXK30SP-MXK10CD-R/RW PLAYBACK3-CDPLAY & EXCHANGEACTIVEBASS EX.CLOCK /TIMER?TAPE A / BCD 3CD 2CD 1COMPACT COMPONENT SYSTEM MX-K301 BIT DUAL D/ACONVERTERPROGRAMSOUND MODEREPEATPANDOMPRESETTUNINGSTANDBY/ONSTANDBYCANCELPHONESREC START / STOPCD REC STARTDUBBINGSET/ DEMOVOLUMEDISC SKIPROCKICLASSCPOPFM MODEFM /AMAUXSLEEPSTANDBY/ONCD1CD2CD3SOUNDMODEACTIVEBASS EX.FADEMUTINGVOLUMEPROGRAM/RANDOMREPEATTAPEA/BTAPECDRadioFans.CN 收音机爱 好者资料库1-2Safety 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1-3Important for laser productsFUSE CAUTION1.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.!CAUTIONPlease use enough caution not to see the beam directly or touch it in case of an adjustment or operationcheck.TTENTI N : FORWITH SAME TYPE REPLACEFUSE (S).REMPLACER PAR UN (LES) FUSIBLE (S)DE MEME TYPE.CONTINUED PROTECTIONAGAINST FIRE HAZARD,REPLACE ONLY WITHSAME TYPE AND RATINGFUSE(S).C UTI N : C UTI N : 1-4Preventing 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 CD changer unit (optical pickup)1. Do not subject the CD changer 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 CD changer 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 CD changer unit. 2. Disconnect the harness from connector on the CD motor board.3. Solder is put up before the card wire is removed from connector CN601 on the main board as shown in Fig.1 and Fig. 2. (When the wire is removed without putting up solder, the CD pick-up assembly might destroy.) 4. 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 changer mechanism. SolderingFig.2Flexible cableFig.1CD changerunitCD changermechanism assembly1-5Disassembly methodTop coverCD changer unitFront panel assemblyChassis unitCD changer unitRemoving the main PCBRemoving the CD changer mechanism assemblyRemoving the CD pickupReplacing the loading motor and belt of the CD changer trayReplacing the CD tray rotor belt of CD changer, and removing the motorFront panel assemblyRemoving the cassette deck mechanismRemoving the earphone jack PCBRemoving the control/FL PCBRemoving the switch PCB and ACTIVE BASS EX. switch PCBRemoving the cassette deck main motor, and replacing the main beltsRemoving the leaf switches of the cassette deck mechanismRemoving the cassette deck headsChassis unitRemoving the 3-pin regulatorRemoving the power amp and supply PCB and the Power Trans PCBCommence disassembly of this set by removing the main units and then proceed to the components and assemblies inside the units.Replacement of the fuses and the power IC1-6Fig.1(B)For MX-K30Fig.2For MX-K10Fig.3For MX-K30Fig.1(A)For MX-K10Caution Be sure to use fuses with the specified ratings.Replacing the fuses (See Fig.1)1.Prior to performing the following procedure, remove the left side BOARDReplace the fuses inside.1.2.Prior to performing the following procedure, remove the top cover.Remove the two screws A from the heat sinkRemove the solder fixing the power IC.Replacing the power IC (See Fig.2 to 3)Replacement of the fuses and the power IC1. Remove the six screws B from the back panel.2. Pull the heat sink cover outward.Replacing the heat sink coverbetween the power IC.Fuse (F951)Fuse (F952)1.6A 250VFW 9513.15A 250VFuse (F951)1.6A 250VFW 951Fuse (F952)1.6A 250VWABWA1-7Fig.5Removing the top cover and two sides BOARD (See Fig.5 and 6)1.2.3.Remove the six screws C that retain the top cover from the rear of the body.Remove the eight screws C and D that retain the top from the two sides of the body.Remove the top cover from the body by lifting it toward the rear.Fig.6BCCTop coverFront panel assemblyFront panel assemblyDD1-8Fig.7Caution Although the CD mechanism unit can be removed without removing the CD tray panel, it is still recommended to remove it in order to prevent damage. Prior to performing the following procedures, remove the top cover and botn sides BOARDa.b.c.From the front panel side of this set, push in the sections marked with arrows and pull out the CD tray toward the front.Remove the CD tray panel by pushing both of its extremities upward in the direction of the arrows.Push the CD tray deep into the set.1. Disconnect the card wires from the CD PCB CN703 and CN203.2. From the rear of the set, remove the two screws Eand two serews G on the front panel left and right side.3. Handle the CD changer unit rear, take out unit. Removing the CD changer unit (See Fig.7 to 10)Fig.9Fig.10Fig.8CD tray panelCD tray panelCD changerunitAccessoryterminalAntennatermianlEFFG1-9 Prior to performing the following procedures, remove the top cover and both sides board.Also remove the CD changer unit.1.2.3.4.Disconnect the parallel wire and card wire from the connectors CN702,CN701,CN101on the power ampand supply PCB.Remove the two screws H retaining the front panel assembly onto the bottom of the body.Remove the screw I retaining the cassette dec k mechanism and then remove the GND lug b that comes from the power amp and supply PCB. Disengage the claws c on both sides at the bottom of the front panel assembly and then remove the assembly.Removing the front panel assembly (See Fig.11 and 12)Fig.11HFig.12IPower amp and supply PCBClaw cGND lug b1-10Fig.13 Prior to performing the following procedures, remove the top cover and both sides board.Also remove the CD changer unit.1.2.3.4.5.Disconnect the wires from CN603A, CN603B and CN604 on the CD PCB, which is located on the back side of the CD changer unit.The two screws J that retain the CD PCB shouldbe removed.Remove the CD PCB b y pulling it toward the side where the CN601 is located.Using solder, short the CD pickup to connect to short round.Disconnect the card wire from the connector CN601 on the main PCB and then remove the main PCB.Removing the CD PCB (See Fig.13 and 14)Fig.14Caution After re-connecting the wires, be sure to remove the shorting solder from the GND connection.CD PCBShort round CN601JCD PCB1-11Fig.15 Prior to performing the following procedures, remove the top cover and both sides board.Also remove the CD changer unit.1.2.Remove the s crewsd from the front chuch baseof the CD changer mechanism unit.Turn the CD changer mechanism cover baseand remove the screws e connecting the unit to the CD changer mechanism assembly.3.Remove the four screws k retaining the CD mechanism holder assembly.Removing the CD changer mechanism assembly (See Fig.15 to 17)Caution When replacing the CD changer mechanism assembly, be sure not to mistake the positions of the silver color and copper color spring .Fig.17Fig.16 eCD changermechanismassemblyK ( Silver color)K ( copper color)K ( Silver color)K ( copper color) dCD changerunit1-12Fig.18Fig.19Fig.20Fig.21Motor lockerTurn table motorObligue gear Prior to performing the following procedures, remove the top cover and both sides board.Also remove the CD changer unit.Also remove the CD changer mechanism 1.2.Widen the section f .While keeping the section f wide open, push the section g in the direction of the arrow to remove the shaft, and then