JVC-MXKB22-cs-sm 维修电路原理图.pdf

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1、SERVICE MANUALCOPYRIGHT 2004 Victor Company of Japan, LimitedNo.MB3062004/8COMPACT COMPONENT SYSTEMMB30620048MX-KB22, MX-KB1TABLE OF CONTENTS1PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-

2、32SPECIFIC SERVICE INSTRUCTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-73DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8

3、4ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-285TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4、 . . 1-33CA-MXKB22SP-MXKB22SP-MXKB22CA-MXKB1SP-MXKB1SP-MXKB1Area suffixEV - Eastern EuropeMX-KB22Area suffixB - U.K.E - Continental EuropeEN - Northern EuropeEV - Eastern EuropeMX-KB1RadioFans.CN 收音机爱 好者资料库1-2 (No.MB306)SPECIFICATIONDesign and specifications are subject to change without notice.Ampl

5、ifierOutput Power30 W per channel, min. RMS, driven into 6 at 1kHz, with no more than10% total harmonic distortion (IEC268-3) 28 W per channel, min. RMS,driven into 6 at 1kHz, with no more than 0.9 % total harmonic distor-tion (DIN)Input Sensitivity/Impedance (1 kHz) AUX IN:500 mV/51 kSpeaker termin

6、als6 - 16 Phones32 - 1 k Cassette Deck Section Frequency Response20 mW/ch output into 32 Type I (NORMAL)63 Hz - 12 500 HzWow And Flutter0.15 % (WRMS)CD PlayerCD Capacity3 CDsDynamic Range85 dBSignal-To-Noise Ratio85 dBWow And FlutterUnmeasurableTunerTuning RangeFM Tuner87.50 MHz - 108.00 MHzAM Tuner

7、(MW) 522 kHz - 1 629 kHzUnitDimensions276 mm 315 mm 456 mm (W/H/D)MassApprox. 8 kgPower SpecificationsPower RequirementsAC 230 V , 50 HzPower Consumption83 W (power on mode) 13 W (in Standby mode) Approx. 2 W (in ECOmode)RadioFans.CN 收音机爱 好者资料库(No.MB306)1-3SECTION 1PRECAUTION1.1Safety Precautions(1)

8、 This design of this product contains special hardware andmany circuits and components specially for safety purpos-es. For continued protection, no changes should be madeto the original design unless authorized in writing by themanufacturer. Replacement parts must be identical tothose used in the or

9、iginal circuits. Services should be per-formed 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 re

10、lieve 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

11、them necessarily be obtained by us-ing replacement components rated for higher voltage, watt-age, etc. Replacement parts which have these specialsafety characteristics are identified in the Parts List of Ser-vice Manual. Electrical components having such featuresare identified by shading on the sche

12、matics and by ( ) onthe Parts List in the Service Manual. The use of a substitutereplacement which does not have the same safety charac-teristics as the recommended replacement parts shown inthe Parts List of Service Manual may create shock, fire, orother hazards.(4) The leads in the products are ro

13、uted 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

14、 be confirmedthat they have been returned to normal, after reassem-bling.(5) Leakage shock hazard testingAfter reassembling the product, always perform an isola-tion check on the exposed metal parts of the product (an-tenna terminals, knobs, metal cabinet, screw heads,headphone jack, control shafts,

15、 etc.) to be sure the productis safe to operate without danger of electrical shock.Do notuse 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, part

16、icular-ly any exposed metal part having a return path to thechassis, to a known good earth ground. Any leakage cur-rent must not exceed 0.5mA AC (r.m.s.). Alternate check methodPlug the AC line cord directly into the AC outlet. Use anAC voltmeter having, 1,000 per volt or more sensitivityin the foll

17、owing manner. Connect a 1,500 10W resistorparalleled by a 0.15F AC-type capacitor between an ex-posed 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 metalpart, particularly any exposed metal part

18、having a returnpath to the chassis, and measure the AC voltage acrossthe resistor. Now, reverse the plug in the AC outlet andrepeat each measurement. Voltage measured any mustnot exceed 0.75 V AC (r.m.s.). This corresponds to 0.5mA AC (r.m.s.). 1.2Warning(1) This equipment has been designed and manu

19、factured 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 p

20、arts.(5) If mains voltage selector is provided, check setting for localvoltage.1.3CautionBurrs formed during molding may be left over on some partsof the chassis. Therefore, pay attention to such burrs in the case of pre-forming repair of this system.1.4Critical parts for safetyIn regard with compon

21、ent 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 thesame type and rat

22、ing as specified by the manufacturer. (This regulation dose not Except the J and C version)Good earth groundPlace this probe on each exposedmetal part.AC VOLTMETER(Having 1000 ohms/volts,or more sensitivity)1500 10W0.15 F AC TYPE1-4 (No.MB306)1.5 Safety Precautions (U.K only)(1) This design of this

23、product contains special hardware and many circuits and components specially for safety purposes. For con-tinued protection, no changes should be made to the original design unless authorized in writing by the manufacturer. Replace-ment parts must be identical to those used in the original circuits.

24、(2) Any unauthorised design alterations or additions will void the manufacturers guarantee; furthermore the manufacturer cannotaccept responsibility for personal injury or property damage resulting therefrom.(3) Essential safety critical components are identified by ( ) on the Parts List and by shad

25、ing on the schematics, and must neverbe replaced by parts other than those listed in the manual. Please note however that many electrical and mechanical parts inthe product have special safety related characteristics. These characteristics are often not evident from visual inspection. Partsother tha

26、n specified by the manufacturer may not have the same safety characteristics as the recommended replacement partsshown in the Parts List of the Service Manual and may create shock, fire, or other hazards.(4) The leads in the products are routed and dressed with ties, clamps, tubings, barriers and th

27、e 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 isrequired, the original lead routing and dress should be observed, and it should be confirmed that they have been returned tonormal, afte

28、r re-assembling.1.5.1Warning(1) Service should be performed by qualified personnel only.(2) This equipment has been designed and manufactured to meet international safety standards.(3) It is the legal responsibility of the repairer to ensure that these safety standards are maintained.(4) Repairs mus

29、t be made in accordance with the relevant safety standards.(5) It is essential that safety critical components are replaced by approved parts.(6) If mains voltage selector is provided, check setting for local voltage.Burrs formed during molding may be left over on some parts of the chassis. Therefor

30、e, pay attention to such burrs in the case of preforming repair of this system.(No.MB306)1-51.6Preventing static electricityElectrostatic discharge (ESD), which occurs when static electricity stored in the body, fabric, etc. is discharged, can destroy the laserdiode in the traverse unit (optical pic

31、kup). Take care to prevent this when performing repairs.1.6.1 Grounding to prevent damage by static electricityStatic electricity in the work area can destroy the optical pickup (laser diode) in devices such as laser products. Be careful to use proper grounding in the area where repairs are being pe

32、rformed. (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.

33、(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 chec

34、k the condition of the laser diode in the optical pickup. The testers internal power source can easilydestroy the laser diode. 1.7Handling 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 sho

35、rted 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 too long atime when attaching it to the connector. (3) Hand

36、le 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.1.8Attention when traverse unit is decomposed*Please refer to Disassembly method in the text for the pickup unit. App

37、ly solder to the short land sections before the flexible wire is disconnected from the connecto on the servo board. (If the flexiblewire is disconnected without applying solder, the pickup may be destroyed by static electricity.) In the assembly, be sure to remove solder from the short land sections

38、 after connecting the flexible wire.1MConductive material(conductive sheet) or iron palate(caption)Anti-static wrist strapCD pickup boardShort-circuit pointCard wire1-6 (No.MB306)1.9Important for laser products1.CLASS 1 LASER PRODUCT2.DANGER : Invisible laser radiation when open and inter lock faile

39、d 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 CD,MD and DVD player uses invisible laser radiation and is equipped with safety switches

40、 which prevent emission of radiation when the drawer is open and the safety interlocks have failed or are defeated. 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 proce

41、dures other than those specified here in may result in hazardous radiation exposure.REPRODUCTION AND POSITION OF LABELSCAUTION : Visible and Invisible laser radiation when open and interlock failed or defeated.AVOID DIRECT EXPOSURE TO BEAM. (e)VARNING : Synlig ochosynling laserstrlning nr den ppnas

42、och sprren rurkopplad. Betrakta ejstrlen. (s)VARO : Avattaessa ja suojalukitusohitettuna tai viallisena olet alttiina nkyvlle ja nkymttmllelasersteilylle. Vlt steenkohdistumista suoraan itseesi. (f)ADVARSEL : Synlig og usynliglaserstrling nr maskinen erben eller interlocken fejeler.Undg direkte eksp

43、onering til strling. (d)!Please use enough caution not to see the beam directly or touch it in case of an adjustment or operationcheck.CLASS 1LASER PRODUCTCAUTION : Visible and Invisible laser radiation when open and interlock failed or defeated.AVOID DIRECT EXPOSURE TO BEAM. (e)VARNING : Synlig och

44、osynling laserstrlning nr den ppnas och sprren rurkopplad. Betrakta ejstrlen. (s)VARO : Avattaessa ja suojalukitusohitettuna tai viallisena olet alttiina nkyvlle ja nkymttmllelasersteilylle. Vlt steenkohdistumista suoraan itseesi. (f)ADVARSEL : Synlig og usynliglaserstrling nr maskinen erben eller i

45、nterlocken fejeler.Undg direkte eksponering til strling. (d)WARNING LABEL(No.MB306)1-7SECTION 2SPECIFIC SERVICE INSTRUCTIONSThis service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.1-8 (No.MB306)SECTION 3DISASSEMBLY3.1Main body3.1.1Removing the top cover / side cover (R) and (L) (See Fig.

46、1 to 6)(1) From the back of the body, remove the two screws A at-taching the top cover.(2) From both sides of the body, remove the four screws B at-taching the top cover and the side cover (R) and (L). Movethe top cover in the direction of the arrow to release fromthe front panel at the two joints a

47、.(3) Remove the six screws D on the back of the body and thetwo screws E on the side of the body. Move the side cover(R) and (L) backward to release the four joints b on the bot-tom of the side covers.Fig.1Fig.2AATop coverTop coverFront panel assemblySide cover (R)BaB(No.MB306)1-9Fig.3Fig.4Fig.5Fig.

48、6DDSide cover (R)Side cover (L)Side cover (R)Front panel assemblyE bE bSide cover (L)Front panel assemblyJoint b1-10 (No.MB306)3.1.2Removing the CD fitting (See Fig.7 to 9) Prior to performing the following procedure, remove the topcover / side cover (R) and (L).Caution:For preventing from damage, m

49、ake sure to remove the CD fit-ting before detaching the CD changer mechanism unit.(1) Push STANDBY / ON key to turn power on.(2) Push CD TRAY EJECT key.(3) Move the CD fitting in the direction of the arrow to releasefrom the CD tray at two joints d.(4) Push STANDBY / ON key to close the tray.3.1.3Re

50、moving the CD fitting (See Fig.8 to 10) Prior to performing the following procedure, remove the topcover / side cover(R) and (L).(1) Turn over the CD changer mechanism unit and turn theloading pulley gear at e in the inner part of the notch of themain board to move the CD tray forward.(2) Move the C