JVC-MXK35V-cs-sm 维修电路原理图.pdf

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1、SERVICE MANUALNo.21033Nov. 2001COPYRIGHT 2001 VICTOR COMPANY OF JAPAN, LTD.MX-K35VMX-K35VCOMPACT COMPONENT SYSTEM Area suffixUS - SingaporeUX - Saudi ArabiaContentsSafety precautionsPreventing static electricityImportant for laser productsDisassembly methodAdjustment methodFlow of functional operati

2、on until TOC read1-21-31-41-51-201-221-231-231-241-35Maintenance of laser pickupReplacement of laser pickupDescription of major ICsWiring connectionsACTIVEBASS EX.PHONESREPEATPROGRAMRANDOM/STOPREC STARTDUBBINGREC STARTCDCLOCK/TIMERTAPEA/BDISC SKIPEJECTPLAYAREC/PLAYBCD CONTROLCD 1CD 2CD 3CD-R/RW PLAY

3、BACKFULL - LOGIC CONTROLCD SYNCHRO RECORDINGEJECTROCKCLASSICPOPVOLUMESOUNDMODEMAXMINMICRM-SMXK35V REMOTE CONTROL12345678910+10FM MODEFM /AMAUXSLEEPSTANDBY/ONSOUNDMODEKARAOKERETURNSTILLNEXT V.INTROHIGHLIGHTPREV.ON SCREENKEY CONTROLMPXACTIVEBASS EX.FADEMUTINGECHOVOLUMEPROGRAM/RANDOMREPEATTAPE A/BTAPEA

4、UXFM/AMCDTAPE1 BIT DUAL D/ACONVERTERCOMPACT COMPONENT SYSTEM MX-K35VSTANDBY/ONSTANDBYSELECTVCD NUMBER TUNINGKEY CONTROLRETURNPBCMIC LEVELCANCELSETPRESETPREVNEXT3-CDPLAY & EXCHANGENTSC/PALCOMPATIBILITYCD1CD2CD3CDSELECTCA-MXK35VSP-MXK35VSP-MXK35VRadioFans.CN 收音机爱 好者资料库MX-K35V1-21. This design of this

5、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. S

6、ervices 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 manufac

7、ture 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 necessaril

8、y 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 (

9、) 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 dress

10、ed 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 confi

11、rmed 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 jac

12、k, 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

13、 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 mo

14、re 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, particu

15、larly 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

16、 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 ar

17、e 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

18、 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 (

19、) 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MX-K35V1-3Preventing static electricity1. Grounding to prevent damage by static electricity Electrostatic discharge (ESD), which occurs when static electricity

20、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 d

21、iode), 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 be

22、fore 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 t

23、he 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. Han

24、dling 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 replacem

25、ent 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 r

26、esistor that adjusts the laser power. Do not turn itAttention when traverse unit is decomposed*Please refer to Disassembly method in the text for pick-up and how to detach the CD changer mechanism. 1. Remove the CD changer unit. 2. Disconnect the harness from connector on the CD motor board.3. Solde

27、r 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

28、in the substrate.Fig.1CD changermechanism assemblyCD changerunitFig.2SolderingConductive material (conductive sheet) or iron plate(caption)Anti-static wrist strapMX-K35V1-4CLASS 1LASER PRODUCTImportant for laser products1.CLASS 1 LASER PRODUCT2.DANGER : Invisible laser radiation when open and inter

29、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

30、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

31、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 :

32、 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

33、 the beam directly or touch it in case of an adjustment or operationcheck.ADVARSEL: Usynlig laser-strling ved bning, nr sikkerhedsafbrydere er ude af funktion. Undgudst-telse for strling (d)VARNING: Osynlig laser- strlning nr denna del r ppnad och sprren r urkopplad. Betrakta ej strlen. (s)DANGER: I

34、nvisible laser radiation when open and interlock failed or defeated.AVOID DIRECT EXPOSURE TO BEAM. (e)VARO: Avattaessa ja suo-jalukitus ohitettaessa olet alttiina nkymttmlle lasersteilylle. l katso steeseen. (f)MX-K35V1-5Disassembly methodTop cover1-7CD changer unit1-8Front panel assembly1-9Chassis

35、unit1-17CD changer unit1-8Removing the main board1-10Removing the CD changer mechanism assembly1-11Removing the CD pickup1-12Replacing the loading motor and belt of the CD changer tray1-12Replacing the CD tray rotor belt of the CD changer, and removing the motor1-12Front panel assembly1-9Removing th

36、e cassette deck mechanism1-13Removing the head phone board1-13Removing the microphone amplifier board1-14Removing the control/FL board1-14Removing the switch board and active bass ex. switch board1-15Removing the cassette deck main motor, and replacing the main belts1-16Removing the leaf switches of

37、 the cassette deck mechanism1-16Removing the cassette deck heads1-17Chassis unit1-17Removing the Video & CD board 1-17Removing the 3-pin regulator1-18Removing the power amplifier board, voltage selector boardand power transformer board1-19Commence disassembly of this set by removing the main units a

38、nd then proceed to the components and assemblies inside the units.Replacement of the fuses and the power IC1-6MX-K35V1-6Caution Be sure to use fuses with the specified ratings.Replacing the fuses (See Fig.1)1.Prior to performing the following procedure, remove the top cover.Replace the fuses inside.

39、1.2.3.4.Prior to performing the following procedure, remove the top cover.Remove the two screws A that attach the heat sink cover to the rear panel.Pull the heat sink cover outward.Remove the two screws B from the bracket that retains the power IC.Remove the solder fixing the power IC.Replacing the

40、power IC (See Fig.2 to 4)Fig.4Fig.1Fig.3Fig.2Replacement of the fuses and the power ICBAHeat sinkPower amplifier boardFuse (F951)2.5A 250VFuse (F953)1.25A 250VPower transformerboardFuse (F952)1.6A 250VChassisHeat sink coverRear panelRear panelRearPower ICsoldering partMX-K35V1-7Fig.5Removing the top

41、 cover (See Fig.5 and 6)1.2.3.Remove the two screws C and four screws D that retain the top cover from the rear of the body.Remove the four screws E retain the top cover from the two sides of the body.Remove the top cover from the body by lifting it toward the rear.Fig.6CDDTop coverFront panel assem

42、blyEEMX-K35V1-8Fig.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.a.b.c.1.2.3.4.5.6.From the front panel side of this set, p

43、ush 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.Disconnect the cassette head wires from the connectors CN307 and CN308 on the main boa

44、rd, which is located below the CD changer unit.Disconnect the microphone amplifier wire from the connector CN306 on the main board.Disconnect the card wires from the connectors CN301, CN302, CN305 and CN606 on the main board.Disconnect the parallel wires from the connectors CN902A, CN902B and CN902C

45、 on the power amplifier board. From the rear of the set, remove the two screws F retaining the CD changer unit, then remove the four screws G retaining the ANTENNA terminal the AUX IN terminal and LINE OUT terminal.Push down and disengage the two claws a holding the CD changer unit at the bottom of

46、its front panel and then remove the CD changer unit.(See Fig. 10)Removing the CD changer unit (See Fig.7 to 10)Fig.10Fig.9Fig.8FGCD tray panelAUX INterminalANTENNAterminalCD tray panelCD changerunitClaw aMX-K35V1-9Fig.11 Prior to performing the following procedures, remove the top cover.Also remove

47、the CD changer unit.1.2.3.4.Disconnect the parallel wire and card wire from the connectors CN901 and CN903 on the power amplifier board.Remove the two screws H retaining the front panel assembly onto the bottom of the body.Remove the screw J retaining the cassette deck mechanism and then remove the

48、GND lug b that comes from the power amplifier board. 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.12HJPower amplifier boardControl/FL boardClaw cGND lug bMX-K35V1-10Fig.13 Prior to

49、performing the following procedures, remove the top cover.Also remove the CD changer unit.1.2.3.4.5.6.Disconnect the wires from CN602 and CN603 on the main board, which is located on the backside of the CD changer unit.Disconnect the card wire from connector CN604 of the main board at the back of th

50、e CD changer unit.The three screws K and screw with washer L retain the main board should be removed.Remove the main board by 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 mai