Akai-X5000W-tape-sm 电路图 维修手册.pdf

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1、I AKAITAPERECORDER MOOEL5000N ALSOAPPLICABLETOMODELX-I5OOOL RadioFans.CN 收音机爱 好者资料库 ., ;:99=W,_17 ;.w ,-6:et TABLEOFCONTENTS I.SPECIFICATIONS. . . . . . . . . . . . . . . .I II.MEASURINGMETHOD. . . . . . . . . . . .2 Ill.COlTROLLOCATIONS. . . . . . . . . . . . . . .4 IV.DISMA:-.lTLINGOFTAPE TRANSPOR

2、T UNIT50/60Hz POWERCONSUMPTION 60VA RECORDINGSYSTEM STYLI WFIGIIT I.e.Used DIQDESUSED SPEAKERS WOWANDFLUTTER tPlaybackOnly)Lessthan0.15%emsat7-1/2ips Lessthan0.2%nnsat3-3/4ips Lessthan0.3/0emsat1-7/8ip FREQUENCYRESPQNSE 40to20,000Hz(3 dH) al7-1/2ips 40to16,000liz(3 dB)at3-3/4ips 50to7,000Hz(3 dH)at1

3、-7/8ips SIGNALTQNQISERATIO Betterthan45 dB(ExternalSpeaker OutputJack). DISTORTIONWithin37ratSpeakerOutput4 V RMS, 8n. CROSSTALKLessthan40dB(Stereo) Lessthen-45dB(Monaural) ERASERATIOLessthan65dB BIAS OSCFREQUENCY 100KHz INSULATlQNRESISTANCE Morethan50Mohms INSULATIONDURABILITY 500VACformorethanonem

4、inute duration. 2 TRANSISTQRSUSED 2S(458(B)x 2 2SC458(0or2SC454(C)x2 2SC971x 2 2SC931(D),(Elx 4 ANI368Qx2 10DC-1x2 Twobuill-in5x78.114 WSpeakers. PQWEROUTPUT LINEQUTPUE Morethan5 V RMS(3.2W),Playback 250lizrecordedtape. Requiredloadimpedancemorethan 50Kohms1.23V(+4.5 dB)(Speaker OfI). DINOUTPUT MICI

5、NPUT LINEINPUT DININPUT Requiredloadimpedancemorethan 50Kohms0.6V. Above0.5IlIV (65dbs) Impedance4.7Kn Above2SmV(30dbs) Impcdancc100K.I1 Above7.5 mV(40dB) 10H Impcd3nce EASTFORWARDANDREWINDTIME 95secondsforafuU1,200ft.tapeat 50liz 75secondsfora full1,200ft.tapeat 60 Hz RadioFans.CN 收音机爱 好者资料库 CROSST

6、ALK(Crosstalkbetweenthetracks) (TAPE) Tape-r-i.;7.-Tape direction:.:j:fot:direction As shownintheabove figure,firstrecord a ,000Hz sinewaveontrackNo.3at+3VUlevel. Next. remove the1,000IlLinput signal and record under a nOll-input condition. Then,playback the tape ontrack0.3andNo.1 (reverse condition

7、oftape) through the1.000Hz B.P.F. (Band Pass Filter,Sensitivity.1:I)andobtaina raliobetween thetwofrol11thefollowingformula: Eo C=2010g E E-(db) 2-I PLAYBACK: 5)SettheRecordplaybackKnobintoPlay position. 6) SettheEqualizerSwitchto7-1/2or33/4 position (tone control max). 7) Connect a V.T.V.M.to the8n

8、Speakeroutput terminal. 8) Playbackthetapepreviollsly recorded. 9)Adjust theoutputlevel to0dBm at 1,000 Hz. (indicated on range selectorofVTV.M.). 10) Playback the recorded spot frequencies underthe conditionsin(9):make a memoofoutpul level and plot the valueona graph. Desired crosstalk ratiu(db) 1,

9、000Hzsignaloutputlevel 1,000Hzcrosstalkoutputlevel No-inputsignalrecordlevel FREQUECYRESPONSE AudioX-SOOO FrequencyRAU.F=Mie Sp :jVTVM/ Oscillator InOUT Connectthemeasuring instrumentsasinthe above diagram,andmeasurethe frequency responseinthe followingsequence: RECORD: 1)Introuuee a sine waveof1,00

10、0Hz(-60dB)tothe Mic.Inputofthe recorder to be tested. throughan altenuatorfromanaudio frequency generator. 2) Sct the Record/Playback Knob toRecposition andadjust the 1ic input volume so that theVU meter needle indicates0VU. 3) Undertheconditiondescribedin(2).lower the input level16dBby meansoftheal

11、tenuator. 4) Recordthespot frequencyintherangeof30Hzto 25,000HLfrollltheaudio frequcncy gencrator. 3 CROSSTALK(Crosstalkbetweenthetracks) (TAPE) Tape direction As showninthe above figure,firstrecorda 1,000Hz sinewaveuntrackNo.3at+3VUlevel. Next, remove tile1,000lizinputsignalandrecordunder a non-inp

12、ut condition. Then,playbackthetape011trackNo.3andNo.I (reverse conditionoftlpe)throughthe1,00011/B.P.F. (BandPassFilter. Sensitivity .1I)andobtain a ratio between thetwofromthe following formula: Eo C=2010g E, E,(db) PLAYBACK: 5) SettheRecord/PlaybackKnobintoPlay position. 6)SettheEqualizerSwitchto7

13、1/2or33/4 position(tonecontrolm3x). 7) Connect aVTV.M,to the 8S1Speakeroutput terminal. 8)Playback the tape previously recorded, 9)Adjust theoutputlevel to 0dBm at 1,000 Hz, (indicated011rangeseleCLOfofV.T.V.M.). 10)Playbacktherecorded spot frequenciesunderthe conditionsill(9) :makea memoofoutputlev

14、eland plotthevalueonagraph. 1 C Eo E, E, Desired crosstalk ratio(db) 1,000Hzsignaloutputlevel 1,000 Hzcrosstalkoutputlevel No-inputsignalrecordlevel FREQUECYRESPONSE AudioX5000 Frequency RA,TTFMicSpRVTVMI Oscillator InOUT Connectthe measuring instrumentsasinthe above diagram.andmeasurethe frequency

15、responseinthe following sequence: RECORD: I) Introduce a sine waveof1.000Hz(-60dB) to the Mic.Inputofthe recorder to be tested, throughan attenuator fromanaudio frequency generator. 2)Set the Record/Playback Knob toRecpOSition andadjusttheMicinputvolumesothattheVU meter needle indicates0VU. 3)Undert

16、hecondition describedin(1), lower the inputlevel16dBbymeansoftheatlcnuator. 4) Recordthespot frequencyintherangeof30Hzto 15.000IlLfrol11theaudio frequency generator. 3 III.CONTROLLOCATIONS i:T pp -t:i=.;:=;:=il-Takel4lReelShaft _-fI,-ReelRetainer /-I+-IRecordSafetyButton /-1-I-l-AutomatJcShut-offLev

17、er PauseLever U-1-!-fastForwardRewindKrob H-RecordPlaybadKnob .:-II-+I-AulomabcStwt-oHSWitch /-+l-RlghtToreControl -PowerSwteh -_I-T-RIi1J1VUMeter f-StereoJack LeftYolumeControl-:=:-:=jt;:=:=,!.oo;=-:.:jt-=:leltVUMeter EQualizerSWitCh-RightVolumeControl SpeedChall:fSWitch Capstan- SupplyReelShalt-u-

18、j ReelRetalfler-tt-I CapstanShaft- CvcleeooverslOll$1tchA-1 CipstanSOIaeepost- TlackSelettl)!- ;InHeadCover- TapeGUlde-+I-ril. IrdeCounter- ResetBulton Pmcheel-1+:.:=- left T.COOtrol-.H-_ MocJa(;LPft-:11-, MtrJackRItll-n:-I-. CycleCof,verlonStcilB-LIMChJtPulJacklelt VltageSelect!lI-DINJack FusePOsl-

19、LilleInputJackleft SpeakerS.tc_.LineInfW.jtJackIRlgt) blernalSpeakerJackIRlght-.!IIIIIII!;t1f-LlneOJtpullackRlg1 IemalSpeakerJackleft-1Itrt 4 IV.DISMANTLINGOFTAPETRANSPORTUNIT IpstanRotation: (,()(,R.P.M. at7-ln(19cm)per scc. 303RJ.M.at3-3/4(9.5cm)persec. 151.5 R.P.M. at1-7/8(4.75cm)per sec. MotorRo

20、tatiun: 3.000to1.500RJ.M.at50IlL 3.600toI.ROORJ.1.at60HI. DRIVINGOFPINCH WHEEL Put tapebetweenrotatingcapstanandpinch wheel,and push the pinch wheel againstthe capstan. Thiswill transportthetapeatr movesbetween/lotorHUSJlil.l:andtheTake-Up Reel Spil/Illlotransmittill!motorrotatioHtosothat thetapeism

21、oved and wound on the lakeupreel. TheTakeupReelSpindleBaseismadelipoftwo plastic rollers(1and2)withaclutchfeltinbetween.TheIdler ISrotatmgllupldSlicr(,llerunderneath.Therefore, thelapewindingfrictionisadjustedbythe slippingof the felttomaiIHainthewindingofIhetape. Ontheotherhand.theSupplyReel Spimll

22、chasd limeRollerhungonthe Plastic Rollerunder neath.which providesappropriatebacktension(bythe feltclutchslipping)totherotationofthe PLilley abuve. Toprevent accident;1 erasure.tIllRecordII/(rlock Hllt/(lllIIlllSfhedepress(dhcI0/,(tl/( U/:CORD/PL-HleIJ(;OHcallbeII/Oiledtote IU:Cpo.itiCJII.rSdfclydCl

23、iceisdepressedto operate the recurding mechanism. (Secfigure 2) 8 Free ROlalton o HIgh-Speed Rotation 0 FAST-FORWARDMECHANISM Turn,hFISTlII),Rhl,ISVkitoFAST FWDposition,andII/(,dinundathe knob pushes uptheI.el(.TheIellermoves11110the space between Ihe Plastic Rullerfd!J,(theTuke-lpUCc! SpilldIeUtl/e

24、IIp!(rpart0I!II(orariu?llIotordnle IlmsllillgtotnHls,;ttil(motorrotaliol/totli( lke-II/ Ireef spilldle,IttIl(X,llIletilllC,I3rakRollers,/luicD COIIl(oi!rll(redspinelle(IIFct111SupplyReelSpil1ll1 .therebySI/pplyRedS/,jl/(II(G.AtIhesametlln. 13rdkeRvlIenalldfJCOlllt:offIhlreel spllllletofri. the (ake-

25、up reel spi/l(lIeJ.Ihl:rebrewindingthetap Ol1tothesupplyreelal a rastspeJ. (Scfigure4) GUideRoller Head Block Pinch Wheel! XX0XX (d)RECORDING 00XX0 PLAYBACK NOTES:Xmarks indicates open andOmarksengaged RECORDINGjPLAYBACKCHANGING MECHANISM(NEWTYPE) -Illlllillthe RICORD/PLAYBACKK;OIllorecord- ingposit

26、ion;auscsCAM010pushRICORDING LEVERS,0and0,as illustrated by thedotted line;thentheRECORD/PLAYBACKCHANGING SWITCHES(SWIOl)and (SW201)turnstorecording position.IftheLEVERSand0donutpush the LEVLRS0properly,the(SW I01)and(SW201)donot operate properly, and abnormal oscillation may occur. Also recording c

27、annot take place. -.PLAY .REC, +-) . - J PLAY.-.-REC. SW-201 SW-IOI SW-201 - Fig. 6 10 VI.MECHANISMADJUSTMENT I.,DJUSTIENTOFPINCHWHEEL It1:Simpurtantthatthe pinch wheel shaft be kepiin completealignmclHwith the capstan shafl. Proper plllch wheel pressureisbetween1,000and1.150gTlI11Swhl1l theLIlli!is

28、operated at the tape speedof7-1/? ips. Any deviation from thisspecificatIOnwill resultIIIwowand flutter. Check pinch wheel pressure b) meansora spring Lalc.andifnecessary. adjustthepinch wheelIUiJd s.PrJl1g. 2.ADJUSnlENTOFTAKE-UPIDLER WHEEL 4.ADJUSTIENTOFINTERIEDIATE WHEEL Theintermediate wheelislot

29、.:aleu belween the rewind idler wheel and therubberrlllg wlHcliISusedonIhe upperpanofthe !lupply reelshaftasscmbl.When the unitissetinrewindIllode.ilwill t.:ontart with these parissimultaneousl)transmitllngmOlorIOrque.An adequatepressureis50grams. AdlustIh,.load springof the intermediate wheelIfthe

30、pressureisnot sufficient. 5.rDJUSTIENTOFTAKE-UPSHAFT ,SSEIBLY rilllake-upidler heelllIu:s1hehpt111complete allgnlllent with thetake-upreel shaft. WhenIIIllIllIlii :)cltofa!)!furwJldmode.the itllcrwiledwilllOll!,H,;1 wllh theLipperknurled wheelofthe take-upreclshaft sSCJ1lbly.anditwillCOBIa.:!withthe

31、lower knurled wheeldurlll,g.recordorplayoperation.idiutidler wheel load spring so thattheidler wheelpresurci;.ept between50and80grams.Theidler wheel rapiul) weafS ifthepressureisexcessive.Slippag.:lcuriif the pressureissmaller than the specification. 3.ADJUSTMENTOFREWINDIDLER WHEEL Therewindidlerwhe

32、elmustbekeptincomplete alll1lllCnlwith thc rewinurclshaft.ThealJ10untof pressureontheknurled1l10tHbushing,shouldbe Jll:lIlltained atabout50grams during rewindoperation. Adjustbnththe idler loadsprinand rewind roller. (a)Re.1nd recl shaftass. reelshaft reel table-reel:;t.ppcr rell tabllbaseplate felt

33、 clutch driwshaft rewind pulley conical springIh -meta.aser felt clutchretam,:r . oilite metal mIg.plate:3oilite metal slar-haped sprmJforbrake._paper.asher -=-:.retatner pulle)8 = (b)Take-upr(plhaftasy. rewmJruhber r-Jrm/.: ;Eo fr rj :coil sprinl( :.asller -retamer rnylon -.:;_washer ;:;setsleeve F

34、ig. I Iell dlltLhllla!l.:n,lll:llt:llhnllotheholtolllsiutofthe reellahkb:Iilpl:Ut0Ih:nrCLoldl1lglaplIIII1tl!hI. slrett.:heddUring.laSIIHardlpratIOl1bCL:.JlISCor excessive tcnsinll. 0check theallloulltoffrictionof this part. place on tile lake-up11.1.1tablea5-il1(h recl with a tJpC6011IIIilldiameter.

35、:.Jndge11tlypull theend oftapeupw:trdlising:1springcale.AdjustthecOllical spring sothJ1theamount01tension al tllis part will be keptbetween400alld500grams.Otherfellclutch materialisalwcl1ecltolhetake-up drive wheel.Itis10 provide pfl)pcr:llippJ11goperJtiotl during recordorpIa) operJtion.Thprocedure

36、forc1Jt.:ckingfrictionoftillS partistheSJIllCJIhe foregoing, and bet wcen150and 200gramoffriclion will prnvide tIlebetresult. Adjusl tlte s;ar-shapedspringjutunderthet:I,.-UPdrive wheel. WhentheunilissetforrewJ1ldoper;.Ilioll. Ihe alllount (If friclionofthispanwill hegre;1l1reduced andWIll become15(

37、)20gralll.CheckIIIllwhcthlr Ihlsl Sllisfactury_ ifnol.rL:.JJ.iuttillt,ll-shap(dpril1gfor Br3ke, and Ihepreureoflhlpnngrelailler illI),. adjustedaccordingl). 6.ADJUSnlENTOFSPPLYREELSIHFT ASSEIBLY Fell clutl:hmakrialIlIsld hllwCln thc10(1sideof the reel table base plateandIherlilldrubberring10 protect

38、recon.ling tape fromCXllSSICtllSltlll durillgth rewindoperation.-,0check the allluuntoffrictionof (hispart.placeontilt lake-up reel tahle a5-indl1(,.,1 with a tape60IIIIII IIIdlHllC(Cr.1IH.1gellllpulltheclld oflapc upward uSing a springGtll.AUllist tillronical sprillgsoIhattheamlHlll1ortCllsilHlathi

39、pari willbl keptbctcen.WOallliSOOgram.OtherfeltdUlch materiJIisattachetl10thetake-up drtve l1lll.Iti10 provide proper slippingUplr:lllo11dllrlng lel:ord01pl:ty operation.Thcprocedure101checking Ir1l:tiull or!hi partistile samcasthe foregoing_andbetwccn150and :?OOgral1Jsoffrictionwillprovide thebctfl

40、sult. Adjust the star-sh:.tped pringill1 limier the take-lip drive wheel. When tile ullitissct for rcwind opcr:ltioll.Theamollnt orfrictiunofthis part will be greatly fcdu(cd andwill become15tuOgrams. Check to seewhetherthisis satisfactory. ifnot.readjust the star-slwped spring for Brake, and thepre

41、!lSUfCoflitepringretainer willbe adjusted accurdingly. 1I 7.ADJUSTMENTOFHEADS a)Azimuth alignmentofthe Rccording/Playhack Heal!(SecFig. 2) PlaybackanAlignmentTape8,000Hzal7-1/2 tapespeedandturnthescrew(B)untiltheLine OutPutLevelreachestheMaximum. r125-t5mm , , , 1_. R.H Fig. 4 12 Tape (8) Fig. 3 CJ

42、H fr ,-9 ,- f=gO.2mm-O.3mm Fig.S b)Allgleorthe Bias Ilead (Sec Fig. 2anclFig. 4) Unfasten two screws and move the13iasIleadby hand until the center line (d)orthe Bias Head makesanangleof90withthedirectionofthe lape.Thenfasten screws. cJClearanceofthe Bias Ilead (See Fig.5) Unfastenthetwoscrewsandmov

43、e the Bias Headbyhanduntiltheclearance(f)and(g) reaches0.2-0.3mm.Thenfasten screws. Note:Ifthe clearance(f)and (g)becomesless than 0.2,-.0.3 mm, the Frequency Charac- teristicwillbetoo low, but Distortionwill decrease.Iftheclearance(f)and(g) becomesmorethan0.2-0.3mOl,the FrequencyCharacteristicwill

44、betoohigh, andDistortionwill increase. VII.AMPLIFIERADUSTMENT 1.ADJUSTMENTOFRECORDINGBIAS FREQUENCY(SeeFig.II J)PUI011the resistor10orSOOhmsin serieswith the BiasHead and connect the Vertical Input Ternullal 01the Oscilloscope to points (a) and(bl. b)FeedinaslIlewavesignalfromanAudio J7rcqucllcyOsci

45、llatortotheIlorilontalinputofthe OscilloscopeandtUIlCtheDialoftheAudio FrequencyOscillatoruntiltheOscilloscope dia- plays a circular or linear paltcrn. Then read the figure on the Dialofthe Audio Frequency Oscil- IaIOr. e)IfitreHh 100KHI:15KCtheRecordingBias l:requcllcyIScorre!.:!. J)IfItisnutl:illT

46、ccLItcallheadjlJtldbyin:;crllllg :lllo1l1crcondenser (C-IX). 3.PLAYBACKMODEIPlAYBACK REELADJUSTMENTSI IOn10delX-SOOO(l)(W). whenslOganyoutput testing equipment, anKnloadreltormustbe lunllccted to the SpeakerOutputTerminals. x5000 I ALDIO I MIC.SI gnlV.T.V.M.I OSc. , on 2.ADJUSnlETOFRECORDIG BIASVOLT

47、AGE a)Reel (See Fig. 2) ConncctaV.T.V.M.10point(a)andadjustthe recording bias voltage byturningL3inthe bias oSl,;illatur circuit untilitreads the sameasthe voltage stamped on the backofthe head assembly. iOIC:Thereisno wayofadjusting the erasing bias voltage. but the correct bIas voltageisabout 100V

48、. r-lEA._I5O!l -.e!.,:;: OSCILLATOIlCICUT :?I AUDIOfllDUIlCY OSCILl.ATOR Fig. I hIPlaybal:ka250III0VUpre-recorded tapc.Turn tipboth Volumc Controls so that thcVUMeters registcr0VThepoweroutputfromboth spcaker terminalswillbewithin 4 V (O.S). At this timc. the Left and Right Volume COlltrols shouldbe tllrned to abollt a45position. c)OutputvoltagefromtheLineOuputandDIN Outputisexistent unly when the Speaker Switchis at Off posltil)ll, The Line OutpUl Voltageisabollt+4dBal0Vl. When the positionofthe VolumeandTone Controls arcchange