JVC-RCBM5-cs-sm 维修电路原理图.pdf

RC-BM5No.21129Oct. 2002COPYRIGHT 2002 VICTOR COMPANY OF JAPAN, LTD.SERVICE MANUALContentsSafety precautionsPreventing static electricityImportant for laser productsImportance administering point on the safetyDisassembly methodAdjustment method1-21-31-41-51-61-16RC-BM5 Area suffixJ - U.S.A.C - CanadaTrouble shootingFlow of functional operation until TOC readMaintenance of laser pickupReplacement of laser pickupDescription of major ICsWiring connection1-191-201-211-211-221-37 CD PORTABLE SYSTEMfifififififififififififififififififififiRadioFans.CN 收音机爱 好者资料库RC-BM51-21. 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RC-BM51-3Conductive 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 disconnectedfrom the connector on the main board. (If the flexible 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 flexible 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 flexible 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.CD/Cassette mechanismassemblyCD pickup unitCard wireShort landMain boardRC-BM51-4Important 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 nr 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. Undgudsttelse for strling.ADVARSEL : Usynlig laserstrling ved pning,nr sikkerhetsbryteren er avslott. unng utsettelse for strling.REPRODUCTION AND POSITION OF LABELSCLASS 1LASER PRODUCT!CAUTIONPlease use enough caution not to see the beam directly or touch it in case of an adjustment or operationcheck.RC-BM51-5Importance administering point on the safety Precaution: Pour eviter les risques de feu, remplacez le fusible de surete par le meme type: 2,5A/250V pour F201.Ce symbole specifie le type du fusible a fonctionnement rapide. Caution: For continued protection against risk of fire, replace only with same type: 2.5A/250V for F201.This symbol specifies type of fast operating fuse.Power amplifier boardF201CN204CN206CN203RC-BM51-612112Fig.4Fig.1Claw aClaw aHandleRear cabinet assemblyFig.2AAAARear cabinet assemblyBFront cabinet assemblyCassette doorFig.3Front cabinet assemblyCassette knobsFig.5Phone jack boardCN205CN302Main boardRemoving the front cabinet assembly and rear cabinet assembly(See Figs. 2 to 5.)Disassembly methodRemoving the handle (See Fig. 1.)1.2.3.4.5.6.7.Remove the eight screws A retaining the front cabinet and rear cabinet assemblies from the rear of the main body. (See Fig.2.)Open the cassette door. (See Fig.3.)Remove the two screws B retaining the front cabinet assembly. (See Fig.3.)Slide the lower part of the front cabinet slightly in the direction of the arrow 1. (See Fig.4.)While removing the front cabinet assembly from the cassette knobs and remove it in the upward direction 2. (See Fig.4.)Disconnect the speaker wire from the connector CN205 on the phone jack board. (See Fig.5.)Disconnect the parallel wire from the connector CN302 on the main board. (See Fig.5.)Lift the handle slightly.While pressing the claws a of the rear cabinet assembly in the direction of the arrow 1, slide the handle in the direction of the arrow 2.1.2.RC-BM51-7Fig.6Display boardFront cabinet assemblyCCCCFig.7Front cabinetassemblySoldered sections dSolderedsection bSoldered sections eSolderedsection cRight mainspeakerRight sub speakerLeft mainspeakerLeft sub speakerDDDDEEEEFig.8Front cabinet assemblyCassette door damperBracketFFRemoving the display board(See Fig. 6.)From the inside of the front cabinet assembly, remove the eight screws C retaining the display board and then take out the display board.Prior to performing the following procedures, remove the front cabinet assembly from the rear cabinet assembly.Removing the right and left main speaker assemblies (See Fig. 7.)1.2.3.From the inside of the front cabinet assembly, remove the six screws D retaining the right and left main speaker assemblies.Remove the solders from the soldered sections b and c of the right and left main speaker assemblies, remove the wires.Take out the right and left main speaker assemblies.Removing the right and left sub speaker assemblies (See Fig. 7.)1.2.3.From the inside of the front cabinet assembly, remove the four screws E retaining the right and left sub speaker assemblies.Remove the solders from the soldered sections d and e of the right and left sub speaker assemblies, remove the wires.Take out the right and left sub speaker assemblies.Removing the cassette door damper (See Fig. 8.)1.2.From the inside of the front cabinet assembly, remove the two screws F retaining the bracket of the cassette door damper.Take out the cassette door damper.NoteAfter assembly, apply a locking agent to the screws F.NoteAfter assembly, apply a locking agent to the screws D.NoteAfter assembly, apply a locking agent to the screws E.RC-BM51-8Fig.10Fig.9Cassette doorHook hHook gClaw fBoss jSection iBoss jBoss mSection nBoss pSpringFig.11Section i112Section kSection qCassette door bracketCassette door bracketCassette door bracketRemoving the cassette door(See Fig. 9.)1.2.3.Open the cassette.While pressing the claws f on the left and right of the cassette door bracket, slide the cassette door.Disengage the hooks g and h on the left and right of the cassette door bracket, and remove the cassette door.Removing the cassette door bracket (See Figs. 10 and 11.)1.2.3.While pressing the sections i on the left and right of the cassette door bracket in the direction of the arrow 1, remove the cassette door bracket from the bosses j of the front cabinet assembly and then open the cassette door bracket in the direction of the arrow 2.Press the section k of the cassette door bracket and remove the cassette door bracket from the boss m of the front cabinet assembly.Disengage the section n of the cassette door bracket from the boss p of the front cabinet assembly and remove the cassette door bracket.NoteBe sure to hang the spring to the section q before attaching the cassette door bracket.RC-BM51-9Fig.14Fig.15Fig.12GGGVolume switch boardControl bracketH402HVolume switchboardFig.13LKKBoard holder (A)Notch sNotch tPhone jackboardSoldered section rCN206Main boardPower amplifier boardCN801HMNSoldered section uSoldered section vWire(blue)Power transformerWire(black)AC jackTie bandControl bracketBoard holder (B)JVolume switchH(Bottom side)Removing the volume switch board(See Fig. 12 and 13.)1.2.3.4.5.Disconnect the wire from the connector H402 on the volume switch board.Remove the four screws G retaining the control bracket of the volume switch board.While pressing the power and volume buttons of the volume switch board, take out the volume switch board.From the forward side of the volume switch board, remove the five screws H retaining the volume switch board to the control bracket. (See Fig.13.)From the bottom side of the control bracket, remove the two screws J retaining the volume switch board and volume button to the control bracket. (See Fig.13.)Prior to performing the following procedures, remove the front cabinet assembly from the rear cabinet assembly.Removing the power amplifier board and phone jack board (See Fig. 14.)1.2.3.4.5.6.Disconnect the wire from the connector CN206 on the power amplifier board.Disconnect the wire from the connector CN801 on the main board.Remove the wire from the soldered section r on the power amplifier board.Remove the two screws K and board holders (A)/(B) retaining the power amplifier board.Remove the two screws L retaining the phone jack board.Pull out the power amplifier board from notches s and t, and then take out the power amplifier board together the phone jack board.Removing the power transformer (See Fig. 15.)1.2.Remove the tie band