Hammond M100Mm2m3SvcMan_text电路图.pdf

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1、n IM INGLUDINe PARTSLIST H000-006059 CAUTION SEESAFETYNOTICEON INSIDECOVERSHEET ORGANSERVICECOMPANY 6475JOLIETROADSUITEB-t LaGRANGEILLINOIS60525 PHONE708-352-8011 RadioFans.CN 收音机爱 好者资料库 SAFETYNOTICE GreatcarehasbeantakenInthedesignandmanufactureofthisproduct toassurethatno shockhazardexistsonanyexp

2、osed metalparts.Internalservice operationscanexpose the techniciantohazardouslinevoltagesandaccidentallycausethesevoltages toappearon exposedmetalpartsduringrepairorreassemblyofproductcomponents.Topreventthis,work ontheseproducts shouldoniybeperformedbythosewhoarethoroughlyfamiliar withthe precautio

3、nsnecessarywhenworkingonthistypeofequipment. Toprotecttheuser,ItIsrequiredthatallenclosurepartsand safetyInterlocksberettoredto theiroriginalconditionandthefollowingtestsbeperformedbefore returningtheproduct to theowneraftoranyserviceoperation. PlugtheACiinecorddirectiyIntoalinevoltageACreceptacle (

4、donotuse anIsolation transformerfor thistest)andturntheproducton.Connectthenetwork(asshownbelow) In seneswithallexposedmetalpartsandaKnownearthgroundsuchasawaterpipeor conduit. UseanACVOMof5,000ohms pervoltorhighersensitivity tomeasurethevoltagedropacross thenetwork.Movethenetworkconnectiontoeachexp

5、osedmetalpart(metalchassis,screw heads,knobsandcontrol shafts,escutcheon, etc.)andmeasurethevoltagedropacross the network.Reversethelineplugandrepeatthemeasurements.Anyreadingof4voltsRMS or moreisexcessiveandindicates apotentialshockhazardwhichmustbecorrectedbefore returningtheproducttotheuser. n TE

6、ST PROBE VOM ACSCALE IOK II .01Mf CERAMICRF BYPASSCAP TESTCLIPS CONNECTEQTOWQWN EARTKORQUHO TOEXPOSEDHETAL PARTS RadioFans.CN 收音机爱 好者资料库 TABLEOFCONTENTS PAGE PAGE GENERALDESCRIPTION INSTALLATIONANDMAINTENANCE MUSICALTERMS NOTESANDOCTAVES HABMONICSOROVERTONES ONEKEYDOESNOT PLAY 19 ONENOTEISWEAX 20 PE

7、RCUSSIONNOTESVEAK 2I PEDALNOTE SOUNDS ATFULL VOLUME 21 PEDALNOTE SOUNDSFAINTLY 21 BOW THEORGANWORKS HUM 21 CONSTRUCTIONANDOPERATIONOFCOMPONENTS7 MOTORSANDPOWERSWITCHES7 TONEGENERATOR MANUALS8 HARMONIC DRAWBARS9 PEDALDRAWBAR9 PEDALKEYBOAIU)9 EXPRESSIONPEDAL10 CONTROLTABLETS10 PERCUSSIONCONTROLTABS10

8、VIBRATOTABS11 + PRESETTABS12 REVERBERATION-VOLUMESOFTTABS,.12 AMPLIFIERASSEMBLY12 MANUALSECTIONOFAMPLIFIER13 PEDALSECTIONOFAMPLIFIER I A INTERMEDIATESECTIONOFAMPLIFIER 15 OUTPUTSECTIONOFAMPLIFIER,.,. 15 PERCUSSIONSECTIONOFAMPLIFIER16 POWERSUPPLY17 TUBESOCKETVOLTAGESH REVERBERATIONAMPLIFIER 17 SPECIA

9、LEQUIPMENT18 RADIO,PHONOGRAPH,ORMICROPHONE18 EXTENSIONSPEAKER18 EAR PHONESIS SPECIALPOV,RSOURCES19 PRACTICALSERVICESUGGESTIONS 19 ORGANDOESNOT PLAY19 REPLACINGTUBES 22 PROCEDUREFORREMOVINGPARTS 22 UPPERMANUAL KEY 22 LOWERMANUALKEY 22 DRAWBARCONTACTSPRING 23 DRAWBARORDRAWBARKNOB 23 UPPERMANUAL 24 LOW

10、ERMANUAL 25 CONTROLPANELACCESS 26 PERCUSSIONSWITCH ACCESS 26 GENERATOR 26 STARTINGMOTOR 26 PILOTLIGHT 26 TABSWITCH 26A VIBRATOLINEBOX 26A PEDALKEYBOARD 26A EXPRESSIONPEDAL 26A PRESETPERCUSSIONUNIT 77 SELECTORSWITCH 78 HARMONICBUSBAR SWITCHINGforinstance,the blackkeybetweenCandDmayproperlybecalledCif

11、(Sharp)orD* (Dflat). HARMONICSOROVERTONES Anymusicalnotehasadefinitefundamentalpitchorfrequencyandalsoacertain tonequalityortimbredependingonitswaveshape.Acomplexnoteisone whichincludesnotonlyafundamentalfrequencybutalsooneormoreharmonics orovertones,eachofwhichisanintegralmultipleofthefundamentalfr

12、equency. Suchacombinationismorepleasingmusicallythan anotehaving onlyasingle frequency.Theeardoesnotdistinguishtheharmonicsindependently ,butinstead identifiesthenoteasacomplextonehavingthepitchofthelowestcomponent, . orfundamental . HOWTHEORGANWORKS Mosttone sources,suchasstrings,reeds ,orpipes,pro

13、ducecomplextones.The Hammondtoneproducingmechanism,however,generatesindividualfrequencieswhich can becombinedbymeansofharmonic drawbarstoproduceanydesiredtonequality. TheblockdiagramsinFigures8thru11showthechiefcomponentsoftheinstru- ments. Electricalimpulsesofvariousfrequenciesareproducedinthetone

14、generator whichcontainsanumberoftonewheelsdrivenatpredeterminedspeedsby a motorandgeararrangement.Eachtonewheelisasteeldisc similartoagear withhighandlowspots,orteeth,onitsedge(seefigure12).As thewheel rotatestheseteethpassnearapermanentmagnet,and theresulringvariations inthemagneticfieldinduceavolt

15、agein acoilwoundonthemagnet.This smallvoltage,whensuitablyfiltered, producesonenoteofthemusicalscale, itspitchorfrequencydependingonthenumber ofteethpassingthemagneteach second. Anote played oneithermanualoftheorgan consistsofafundamentalpitchand anumberofharmonics,ormultiplesofthefundamentalfrequen

16、cy. Thefundament al andeightharmonicsavailableoneach playingkey arecontrollablebymeans ofdrawbars.Bysuitableadjustmentofthesecontrols theplayer mayvarythe tonecolorsatwill.TheM-lOOConsolehasseveralpresettabs whichmakesever- alpre-selectedtonesavailable, MODELM Mixedtonesfromthemanualsareamplifiedand

17、then passthroughthevibrato mechanism,theexpressioncontrol,andadditionalstagesofamplification before reachingtheloudspeaker - MODELM-2iM-3iM-lOO Mixedtonesfrom eithertheupperorthelower manualmaygothrougheitherthe vibratochannelortheNoVibratochannel,depending onthepositionofthe correspondingvibratosel

18、ectorofVibratoCanceltabs. (Theuppermanualis calledSoloontheselectortaboftheM-2andM-3to indicatethatitis bestsuitedforplayingmelodyorsolopartsof themusic.)Thetonesarethen combinedandpassedthroughtheexpressioncontrol andadditionalstagesof amplificationbeforereachingthespeaker(s)- MODELM-3M-lOO Percuss

19、iontonesareproducedbyborrowingasignalfromtheuppermanual2nd harmonicdrawbar,3rdharmonicdrawbar,orboth,amplifyingit,returningpart ofthesignaltothesamedrawbar,andconductingthebalanceof thesignal throughpush-pullcontroltubeswhereitsdecaycharacteristicsarecontrolled. Thepercussionsignalisthencombinedwith

20、thesignalfromthemanualsafter thevibratosystembutbeforetheexpressioncontrol.Thecontroltubesare keyedthroughthe6thharmonickeycontactsand busbar. Thepedaltones donotrequiredrawbarsfortonecolorvariation,because they areproducedascomplextonesbyspecialtonewheels.Fromthepedalsthese tonesgotoapedalamplifier

21、,wheretheattackanddecaycharacteristicsare controlled.Thesinglepedaldrawbaradjusts thevolumeofthepedalsrelative tothatofthemanuals,andthepedalsignalthaniscombinedwiththesignal fromthemanual beforepassingthroughtheexpression control,butafterthe vibratosystem. CONSTRUCTIONANDOPERATIONOFCOMPONENTS Inrev

22、iewingthissectionrefertotheschematiccircuitsoftheentireorgan systemsinthebackofthismanual.Connectionsbetweencomponentsareshown in thewiringdiagramsandcontrolassemblywiringdrawings,alsointhebackofthe manual, MOTORSANDPOWERSWITCHES Thetonegeneratorassemblyinwhichalltonesoftheorganoriginate,is drivenat

23、constantspeedbyasynchronousmotor,locatedattheleftsideasyou lookinatthebackoftheConsole.Attachedtoitisthevibratoscanner.As thesynchronousmotorisnotself-starting,itmustbebroughtuptospeedby astartingmotorattheoppositeendofthegenerator. Theprocedureforturningontheorganisasfollows:Pushthestartswitch up(M

24、-3,M-lOO)orin(M,M-2)andholditforapproximatelyeightseconds. Thisallowstimeforthestartingmotortobringthegeneratoruptoslightly aboveitsynchronousspeed-Whilestillholdingthestartswitch,pushthe runswitchupwardtoitsonposition.Thisturnsonthesynchronousmotor andatthesametimeintroduc,esaresistorinserieswithth

25、estartingmotor toreduceitspower-Holdthestartswitchaboutfoursecondslongerandthen releaseit- Duringthistimethebrakingactionofthesynchronousmotor,togetherwiththe reductioninpowerofthestartingmotor,bringsthesystemtosynchronous speedsothatthesynchronousmotorcancarrytheload. Toturnoffthe.organ,pushtheruns

26、witchdownwardtotheoffposition. a TONEGENERATOR Alltonesoftheorganoriginateaselectricalsignalsinthetonegenerator assembly.TheM,M-2andM-3contains85tonewheelswhiletheM-lOOhas87, Eachofthesewheelshasvariousnumbersofteeth,with suitablegearsfordriv- ingthematvariousspeedsfromamainshaftextendingalongthecen

27、ter.Each pairoftonewheelsismountedonashaftandbetweenthemisabakelitegear heldbetweentwocoilsprings,formingamechanicalvibrationfilter.Asthe gearisnotrigidlyattachedtotheshaft,anypairofwheelswhichmaybe stoppedaccidentallywillnotinterferewiththeoperationoftheothers. Adjacenttoeachtonewheelisamagnetizedr

28、odwithapick-upcoilwoundon it.Thesemagnetsextendthroughthefrontandbackofthegenerator,andare heldbysetscrewswhichcanbeloosenedincaseadjustmentisevernecessary. Figure13showswheretofindthemagnetforanyfrequencynumber.Inthis drawingthedottedlinesindicatefrequencieswhosetonewheelsare onthe sameshaft. Ontop

29、ofthetonegeneratorassemblyaresmalltransformersandcondensers , formingtunedfiltersforthehigherfrequencies.Theyare notlikely toneed replacing.Incaseone filterbecomesinoperative,boththetransformersand condensermustbereplacedwithamatchedsetfromthefactory.Figures 14, 15 16and17showthelocationsofthesefilt

30、ersontheindicatedmodels.A fewfrequenciesuseuntunedfiltersconsistingofcoilsalone. Theoutputfrequenciesofthetonegeneratorarenumbered ,forconvenience,in orderofincreasingfrequency.Thelowest,number 1 ,isabout32cyclesper second,andthehighest,number91,isabout6000cyclespersecond. Frequency numbers1to12 (1t

31、o13onM-lOO)areusedforpedals;numbers13to17 (14to 17onM-lOO)areomitted;andnumbers18to91areusedforthemanuals. In case anygenerator frequencyisweakorabsent,refer toPracticalService Suggestionsfortheproceduretobeusedinlocatingandcorrecting thetrouble. Theoutputterminalsofthegeneratorconsistofsolderlugsmo

32、unted onthefil- tertransformers,towhichthemanualcableandpedalsareconnected*Thefre- quencynumbersofallterminalsareindicatedinFigures 14,15,16and17. MANUALS Musicalfrequenciesfromthetonegeneratorgothroughthemanual cabletoterm- inalstripsonthetwomanualsandfromthemtothe keycontactsprings- Eachofthetwoma

33、nualshasforty-four (44)playingkeys,orapproximately 3-1/2octaves.Thetwomanualsdonot coverexactlythesamepitchrange,but theyarearrangedsothatkeysoflikepitchare inline.MiddleCisthefirst Contheuppermanualandthekeyinline withiton thelowermanual. Undereachkeyareanumberofcontact springs(forthefundamentaland

34、har- monicsofthatkey)whichtouchanequalnumberof busbarswhenthekeyispress- ed,(Somekeysattherightendofeachmanualhavefewer springs,asnotedbe- low) -Allcontactspringsandbusbarshavepreciousmetalcontact surfacesto avoid corrosion,andthemanualsaresealedtoexcludedustsofar aspossible. Incaseacontactbecomesdi

35、rtyinspiteofthese precautions,abusbarshifter (showninFigures 3,5,7)isprovidedineachmanualtoslidethebusbarsend- wiseandthusprovideafreshcontactsurface. Thebusbarshiftingmechanismis somewhatdifferentontheM-lOOthan onprior modelsoftheHammondOrgamModelsM,M-2 andM-3.Lookingunderthelowerman- ualonthelefth

36、andend,ablackwoodendblockwillbeobserved. Onehalfinch fromthefrontofthis blockisadrilledhole.Withinthisdrillingisasmall metaltonguewithapunchedhole.Usingeither longnosepliersorahook,this tonguecanbemovedinandoutanditinturnmovesthebusbars. Theupperman- ualshifterisinasimilarplace,but requiresremovalof

37、thegeneratordust covertogain accesstoit. The keycontactsareconnected throughresistancewirestothemanualterminal strips.Themanualwiring chartFigure18,showshowthecontactofeachkey areconnectedtotheproperfrequenciestosupply thefundamentalandharmonics ofthatparticularkey.Theblank spacesindicatethatnokeyco

38、ntactisused, inasmuchasthehighestharmonicsofthehighest keysareabovetherangeofthe tonegeneratorandarenotrequired.Sincethepercussion controltubesinthe M-3andM-lOOarekeyedthroughthe6th harmonicbusbar,theblankspacesinthis rowhavecontactsconnectedtogroundthroughresistance wires. Thebusbarsofeachmanual, e

39、achonecarryingacertainharmonic,are wiredto theharmonic drawbarsforthatmanualintheM, M-2,M-3andthroughtheDraw- barstabintheM-IOO- 8 HARMONICDRAWBARS Theleftgroupofeight(8)harmonicdrawbars(Figure19)isassociatedwiththe lowermanual,andtherightgroupofnine(9)drawbars controlstheuppermanual. Byslidingthese

40、drawbarsinandout,theorganistisabletomixthefundamen talandharmonics(orovertones)invariousporportions.Thedistanceabaris pulledoutdeterminesthe strength ofthecorrespondingharmonic;andifadraw- barissetallthewayin,theharmonicitrepresentsisnotpresentinthe mixture.Neithermanualwill playunlessatleastoneofit

41、sdrawbarsispulled outatleastpartofthewayinthecaseoftheM,M-2,M-3,orwiththeDraw- barstabpressedorpresettabpressedintheM-100. Thedrawbarsslideovernine (9)busbars ,representingintensitylevels,and eachdrawbarhastwocontactsconnectedtogetherbyaoneohmresistor.Asthe drawbarmoves,atleastoneofthecontactsistouc

42、hingsomebusbaratalltimes, andthereforethereisnodeadspotinthedrawbarmotion.Theoneohmre- sistoravoidsanactualshortcircuitbetweenadjacentbusbars.Thesebusbars extendthelengthofthedrawbarassemblybutaresplitinthemiddletoform twogroupsofnine(9)-Thoseintheleftgroup,underthelowermanualdraw* bars,areconnected

43、tolowimpedanceprimarytapsonthelowermanualmatching transformer.Similarly,thoseintherightgroup,undertheuppermanual drawbars,areconnectedtotapson theuppermanualmatchingtransformer-Sig- nalsfromthehighimpedancesecondariesofthesetwotransformersgothrough thelowermanualVibratoCancelanduppermanualVibratoCan

44、celtabstothe apraplifierinputterminals - PEDALDRAWBAR The12(M,M-2,M-3)or13(M-100)playingpedalsareoperatedbytheleftfoot andareconnectedtothelowest12or13frequenciesofthegenerator.The centerdrawbaradjuststhevolumeofthepedals.Itoperatesavariablecon- denser(showninFigures 3,5,and7)whichisconnectedtothepe

45、dalsection oftheamplifier.Foroperationofthecircuitseedescriptionofamplifier, PEDALKEYBOARD The13playingpedalsareoperatedbytheleftfootandareconnectedtothe lowest13frequenciesofthegenerator.Likethemanuals,theyhavelightand darkkeysarrangedinthestandardoctavepattern.Figures20and21identifies thepedalsand

46、showsthegeneratorfrequencynumberassociatedwitheach. Apedalcontactoneachpedalopenswhenthepedalispressed,therebyallow- ingthecorrectgeneratorfrequencytoreachtheamplifier.Inadditionthereis apedalkeyingcontactfor allpedals,whichcloseswhenanypedalisoperated. Itservestokeythepedalamplifier,causingthenotet

47、osoundatthedesired rate- Whenapedalispresseditspedalcontactopensfirst,selectingthecorrect note.Immediatelythepedal keyingcontactcloses,causingthenotetosound. Whenthepedalisreleasedamechanicallatchkeepsthepedal contactopen, sothatthelast-playedpedalnotecontinuestosoundforalengthoftimede- terminedbyth

48、epositionofthepedalFastDecayandPedalLegatotabsin theM-100.IntheM,M-2,andM-3;thetimewhichthepedalsoundisheardis determinedbythesettingofthePedalDecaytabletandaPedalsustaining controlattachedtotheexpressioncontrol.Theelectricaloperationofthese circuitsisdescribedunderamplifier- 9 EXPRESSIONPEDAL Theex

49、pressionpedal,sometimes calledswellpedal(Figures 1 ,2,4,and 6) isoperatedbytheplayersrightfootandvariesthevolumeofbothmanuals andpedalstogether.Itisconnectedmechanicallytoaspecial variableair condensermountedontheamplifier.Whenthepedalistiltedback (closed) bypushingontheplayersheelthemusicissoftest, andwhenpushedforward (opened)byCheplayerstoethemusicisloudest- IntheM,M-2,andM-3,attachedtotheexpression pedalisapedalsustain- ingcontrollever,whichisoperatedbysliding the footsldewlseonthe pedal.Ifthisleverisnotpressed, eachpedalnotediesawayrapidlyor slowly,dependingonthesettingofthepedald