Hammond M100Mm2m3SvcMan_text电路图.pdf

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 shockhazardexistsonanyexposed metalparts.Internalservice operationscanexpose the techniciantohazardouslinevoltagesandaccidentallycausethesevoltages toappearon exposedmetalpartsduringrepairorreassemblyofproductcomponents.Topreventthis,work ontheseproducts shouldoniybeperformedbythosewhoarethoroughlyfamiliar withthe precautionsnecessarywhenworkingonthistypeofequipment. Toprotecttheuser,ItIsrequiredthatallenclosurepartsand safetyInterlocksberettoredto theiroriginalconditionandthefollowingtestsbeperformedbefore returningtheproduct to theowneraftoranyserviceoperation. PlugtheACiinecorddirectiyIntoalinevoltageACreceptacle (donotuse anIsolation transformerfor thistest)andturntheproducton.Connectthenetwork(asshownbelow) In seneswithallexposedmetalpartsandaKnownearthgroundsuchasawaterpipeor conduit. UseanACVOMof5,000ohms pervoltorhighersensitivity tomeasurethevoltagedropacross thenetwork.Movethenetworkconnectiontoeachexposedmetalpart(metalchassis,screw heads,knobsandcontrol shafts,escutcheon, etc.)andmeasurethevoltagedropacross the network.Reversethelineplugandrepeatthemeasurements.Anyreadingof4voltsRMS or moreisexcessiveandindicates apotentialshockhazardwhichmustbecorrectedbefore returningtheproducttotheuser. n TEST 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 PERCUSSIONNOTESVEAK 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 VIBRATOTABS11 + PRESETTABS12 REVERBERATION-VOLUMESOFTTABS,.12 AMPLIFIERASSEMBLY12 MANUALSECTIONOFAMPLIFIER13 PEDALSECTIONOFAMPLIFIER I A INTERMEDIATESECTIONOFAMPLIFIER 15 OUTPUTSECTIONOFAMPLIFIER,.,. 15 PERCUSSIONSECTIONOFAMPLIFIER16 POWERSUPPLY17 TUBESOCKETVOLTAGESH REVERBERATIONAMPLIFIER 17 SPECIALEQUIPMENT18 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 LOWERMANUAL 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(Sharp)orD* (Dflat). HARMONICSOROVERTONES Anymusicalnotehasadefinitefundamentalpitchorfrequencyandalsoacertain tonequalityortimbredependingonitswaveshape.Acomplexnoteisone whichincludesnotonlyafundamentalfrequencybutalsooneormoreharmonics orovertones,eachofwhichisanintegralmultipleofthefundamentalfrequency. Suchacombinationismorepleasingmusicallythan anotehaving onlyasingle frequency.Theeardoesnotdistinguishtheharmonicsindependently ,butinstead identifiesthenoteasacomplextonehavingthepitchofthelowestcomponent, . orfundamental . HOWTHEORGANWORKS Mosttone sources,suchasstrings,reeds ,orpipes,producecomplextones.The Hammondtoneproducingmechanism,however,generatesindividualfrequencieswhich can becombinedbymeansofharmonic drawbarstoproduceanydesiredtonequality. TheblockdiagramsinFigures8thru11showthechiefcomponentsoftheinstru- ments. Electricalimpulsesofvariousfrequenciesareproducedinthetone generator whichcontainsanumberoftonewheelsdrivenatpredeterminedspeedsby a motorandgeararrangement.Eachtonewheelisasteeldisc similartoagear withhighandlowspots,orteeth,onitsedge(seefigure12).As thewheel rotatestheseteethpassnearapermanentmagnet,and theresulringvariations inthemagneticfieldinduceavoltagein acoilwoundonthemagnet.This smallvoltage,whensuitablyfiltered, producesonenoteofthemusicalscale, itspitchorfrequencydependingonthenumber ofteethpassingthemagneteach second. Anote played oneithermanualoftheorgan consistsofafundamentalpitchand anumberofharmonics,ormultiplesofthefundamentalfrequency. Thefundament al andeightharmonicsavailableoneach playingkey arecontrollablebymeans ofdrawbars.Bysuitableadjustmentofthesecontrols theplayer mayvarythe tonecolorsatwill.TheM-lOOConsolehasseveralpresettabs whichmakesever- alpre-selectedtonesavailable, MODELM Mixedtonesfromthemanualsareamplifiedandthen passthroughthevibrato mechanism,theexpressioncontrol,andadditionalstagesofamplification before reachingtheloudspeaker - MODELM-2iM-3iM-lOO Mixedtonesfrom eithertheupperorthelower manualmaygothrougheitherthe vibratochannelortheNoVibratochannel,depending onthepositionofthe correspondingvibratoselectorofVibratoCanceltabs. (Theuppermanualis calledSoloontheselectortaboftheM-2andM-3to indicatethatitis bestsuitedforplayingmelodyorsolopartsof themusic.)Thetonesarethen combinedandpassedthroughtheexpressioncontrol andadditionalstagesof amplificationbeforereachingthespeaker(s)- MODELM-3M-lOO Percussiontonesareproducedbyborrowingasignalfromtheuppermanual2nd harmonicdrawbar,3rdharmonicdrawbar,orboth,amplifyingit,returningpart ofthesignaltothesamedrawbar,andconductingthebalanceof thesignal throughpush-pullcontroltubeswhereitsdecaycharacteristicsarecontrolled. Thepercussionsignalisthencombinedwiththesignalfromthemanualsafter thevibratosystembutbeforetheexpressioncontrol.Thecontroltubesare keyedthroughthe6thharmonickeycontactsand busbar. Thepedaltones donotrequiredrawbarsfortonecolorvariation,because they areproducedascomplextonesbyspecialtonewheels.Fromthepedalsthese tonesgotoapedalamplifier,wheretheattackanddecaycharacteristicsare controlled.Thesinglepedaldrawbaradjusts thevolumeofthepedalsrelative tothatofthemanuals,andthepedalsignalthaniscombinedwiththesignal fromthemanual beforepassingthroughtheexpression control,butafterthe vibratosystem. CONSTRUCTIONANDOPERATIONOFCOMPONENTS Inreviewingthissectionrefertotheschematiccircuitsoftheentireorgan systemsinthebackofthismanual.Connectionsbetweencomponentsareshown in thewiringdiagramsandcontrolassemblywiringdrawings,alsointhebackofthe manual, MOTORSANDPOWERSWITCHES Thetonegeneratorassemblyinwhichalltonesoftheorganoriginate,is drivenatconstantspeedbyasynchronousmotor,locatedattheleftsideasyou lookinatthebackoftheConsole.Attachedtoitisthevibratoscanner.As thesynchronousmotorisnotself-starting,itmustbebroughtuptospeedby astartingmotorattheoppositeendofthegenerator. Theprocedureforturningontheorganisasfollows:Pushthestartswitch up(M-3,M-lOO)orin(M,M-2)andholditforapproximatelyeightseconds. Thisallowstimeforthestartingmotortobringthegeneratoruptoslightly aboveitsynchronousspeed-Whilestillholdingthestartswitch,pushthe runswitchupwardtoitsonposition.Thisturnsonthesynchronousmotor andatthesametimeintroduc,esaresistorinserieswiththestartingmotor toreduceitspower-Holdthestartswitchaboutfoursecondslongerandthen releaseit- Duringthistimethebrakingactionofthesynchronousmotor,togetherwiththe reductioninpowerofthestartingmotor,bringsthesystemtosynchronous speedsothatthesynchronousmotorcancarrytheload. Toturnoffthe.organ,pushtherunswitchdownwardtotheoffposition. a TONEGENERATOR Alltonesoftheorganoriginateaselectricalsignalsinthetonegenerator assembly.TheM,M-2andM-3contains85tonewheelswhiletheM-lOOhas87, Eachofthesewheelshasvariousnumbersofteeth,with suitablegearsfordriv- ingthematvariousspeedsfromamainshaftextendingalongthecenter.Each pairoftonewheelsismountedonashaftandbetweenthemisabakelitegear heldbetweentwocoilsprings,formingamechanicalvibrationfilter.Asthe gearisnotrigidlyattachedtotheshaft,anypairofwheelswhichmaybe stoppedaccidentallywillnotinterferewiththeoperationoftheothers. Adjacenttoeachtonewheelisamagnetizedrodwithapick-upcoilwoundon it.Thesemagnetsextendthroughthefrontandbackofthegenerator,andare heldbysetscrewswhichcanbeloosenedincaseadjustmentisevernecessary. Figure13showswheretofindthemagnetforanyfrequencynumber.Inthis drawingthedottedlinesindicatefrequencieswhosetonewheelsare onthe sameshaft. Ontopofthetonegeneratorassemblyaresmalltransformersandcondensers , formingtunedfiltersforthehigherfrequencies.Theyare notlikely toneed replacing.Incaseone filterbecomesinoperative,boththetransformersand condensermustbereplacedwithamatchedsetfromthefactory.Figures 14, 15 16and17showthelocationsofthesefiltersontheindicatedmodels.A fewfrequenciesuseuntunedfiltersconsistingofcoilsalone. Theoutputfrequenciesofthetonegeneratorarenumbered ,forconvenience,in orderofincreasingfrequency.Thelowest,number 1 ,isabout32cyclesper second,andthehighest,number91,isabout6000cyclespersecond. Frequency numbers1to12 (1to13onM-lOO)areusedforpedals;numbers13to17 (14to 17onM-lOO)areomitted;andnumbers18to91areusedforthemanuals. In case anygenerator frequencyisweakorabsent,refer toPracticalService Suggestionsfortheproceduretobeusedinlocatingandcorrecting thetrouble. Theoutputterminalsofthegeneratorconsistofsolderlugsmounted onthefil- tertransformers,towhichthemanualcableandpedalsareconnected*Thefre- quencynumbersofallterminalsareindicatedinFigures 14,15,16and17. MANUALS Musicalfrequenciesfromthetonegeneratorgothroughthemanual cabletoterm- inalstripsonthetwomanualsandfromthemtothe keycontactsprings- Eachofthetwomanualshasforty-four (44)playingkeys,orapproximately 3-1/2octaves.Thetwomanualsdonot coverexactlythesamepitchrange,but theyarearrangedsothatkeysoflikepitchare inline.MiddleCisthefirst Contheuppermanualandthekeyinline withiton thelowermanual. Undereachkeyareanumberofcontact springs(forthefundamentalandhar- monicsofthatkey)whichtouchanequalnumberof busbarswhenthekeyispress- ed,(Somekeysattherightendofeachmanualhavefewer springs,asnotedbe- low) -Allcontactspringsandbusbarshavepreciousmetalcontact surfacesto avoid corrosion,andthemanualsaresealedtoexcludedustsofar aspossible. Incaseacontactbecomesdirtyinspiteofthese precautions,abusbarshifter (showninFigures 3,5,7)isprovidedineachmanualtoslidethebusbarsend- wiseandthusprovideafreshcontactsurface. Thebusbarshiftingmechanismis somewhatdifferentontheM-lOOthan onprior modelsoftheHammondOrgamModelsM,M-2 andM-3.Lookingunderthelowerman- ualonthelefthandend,ablackwoodendblockwillbeobserved. Onehalfinch fromthefrontofthis blockisadrilledhole.Withinthisdrillingisasmall metaltonguewithapunchedhole.Usingeither longnosepliersorahook,this tonguecanbemovedinandoutanditinturnmovesthebusbars. Theupperman- ualshifterisinasimilarplace,but requiresremovalofthegeneratordust covertogain accesstoit. The keycontactsareconnected throughresistancewirestothemanualterminal strips.Themanualwiring chartFigure18,showshowthecontactofeachkey areconnectedtotheproperfrequenciestosupply thefundamentalandharmonics ofthatparticularkey.Theblank spacesindicatethatnokeycontactisused, inasmuchasthehighestharmonicsofthehighest keysareabovetherangeofthe tonegeneratorandarenotrequired.Sincethepercussion controltubesinthe M-3andM-lOOarekeyedthroughthe6th harmonicbusbar,theblankspacesinthis rowhavecontactsconnectedtogroundthroughresistance wires. Thebusbarsofeachmanual, eachonecarryingacertainharmonic,are wiredto theharmonic drawbarsforthatmanualintheM, M-2,M-3andthroughtheDraw- barstabintheM-IOO- 8 HARMONICDRAWBARS Theleftgroupofeight(8)harmonicdrawbars(Figure19)isassociatedwiththe lowermanual,andtherightgroupofnine(9)drawbars controlstheuppermanual. Byslidingthesedrawbarsinandout,theorganistisabletomixthefundamen talandharmonics(orovertones)invariousporportions.Thedistanceabaris pulledoutdeterminesthe strength ofthecorrespondingharmonic;andifadraw- barissetallthewayin,theharmonicitrepresentsisnotpresentinthe mixture.Neithermanualwill playunlessatleastoneofitsdrawbarsispulled outatleastpartofthewayinthecaseoftheM,M-2,M-3,orwiththeDraw- barstabpressedorpresettabpressedintheM-100. Thedrawbarsslideovernine (9)busbars ,representingintensitylevels,and eachdrawbarhastwocontactsconnectedtogetherbyaoneohmresistor.Asthe drawbarmoves,atleastoneofthecontactsistouchingsomebusbaratalltimes, andthereforethereisnodeadspotinthedrawbarmotion.Theoneohmre- sistoravoidsanactualshortcircuitbetweenadjacentbusbars.Thesebusbars extendthelengthofthedrawbarassemblybutaresplitinthemiddletoform twogroupsofnine(9)-Thoseintheleftgroup,underthelowermanualdraw* bars,areconnectedtolowimpedanceprimarytapsonthelowermanualmatching transformer.Similarly,thoseintherightgroup,undertheuppermanual drawbars,areconnectedtotapson theuppermanualmatchingtransformer-Sig- nalsfromthehighimpedancesecondariesofthesetwotransformersgothrough thelowermanualVibratoCancelanduppermanualVibratoCanceltabstothe apraplifierinputterminals - PEDALDRAWBAR The12(M,M-2,M-3)or13(M-100)playingpedalsareoperatedbytheleftfoot andareconnectedtothelowest12or13frequenciesofthegenerator.The centerdrawbaradjuststhevolumeofthepedals.Itoperatesavariablecon- denser(showninFigures 3,5,and7)whichisconnectedtothepedalsection oftheamplifier.Foroperationofthecircuitseedescriptionofamplifier, PEDALKEYBOARD The13playingpedalsareoperatedbytheleftfootandareconnectedtothe lowest13frequenciesofthegenerator.Likethemanuals,theyhavelightand darkkeysarrangedinthestandardoctavepattern.Figures20and21identifies thepedalsandshowsthegeneratorfrequencynumberassociatedwitheach. Apedalcontactoneachpedalopenswhenthepedalispressed,therebyallow- ingthecorrectgeneratorfrequencytoreachtheamplifier.Inadditionthereis apedalkeyingcontactfor allpedals,whichcloseswhenanypedalisoperated. Itservestokeythepedalamplifier,causingthenotetosoundatthedesired rate- Whenapedalispresseditspedalcontactopensfirst,selectingthecorrect note.Immediatelythepedal keyingcontactcloses,causingthenotetosound. Whenthepedalisreleasedamechanicallatchkeepsthepedal contactopen, sothatthelast-playedpedalnotecontinuestosoundforalengthoftimede- terminedbythepositionofthepedalFastDecayandPedalLegatotabsin theM-100.IntheM,M-2,andM-3;thetimewhichthepedalsoundisheardis determinedbythesettingofthePedalDecaytabletandaPedalsustaining controlattachedtotheexpressioncontrol.Theelectricaloperationofthese circuitsisdescribedunderamplifier- 9 EXPRESSIONPEDAL Theexpressionpedal,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