Hammond_T-500_Series_Service_Manual电路图.pdf

SERVICEMANUAL T-500 SERIES T-524T-582 T-546T-595 NOTE:ForallotherT-Series serviceinformalion,refer toH000-000431 HOOO-001270 CAUTION SEESAFETYNOTICEON INSIDECOVEH SHEET RadioFans.CN 收音机爱 好者资料库 SECTIONI HOWTHEORGANOPERATES 1-1GENERAL - TheHammondT-500 Organ J-scompletely self-contained, requiringnoexternal tonecabinet. Theorganis equipped withtwo manuals,orkeyboards ofAkeys each,a13-note pedalkeyboard, andaneKpression (swell)pedal Eorcontrolling outputvolume. Seventeenadjustable tonebara and six presettabsenableselection oftonecolors.An automatic programablerhythm unitwith autochording featureisthe 1-2 diatinsuishingfunctionof this organfroiopreviousT-Seriea organs.Thereroainine musical variationsarecontrolled by tabletsandknobsprovided. A switch(Seefigure 1-1.)controls powertoallmotorand electronic circuitsinthe organ.A pilot lighcindicateswhenthe instrumentispowered, TONESOURCE - Alltonesof the organoriginateas electrical ,i(5stf ebu Mfnni cnmiBtwas inrTfffHTCBWTEHinm 1PBAlILEKT UllaEBIE PtH.EFlfCTandif atonebarissetalltheuayIn, theharraontcitrepresents isnotpresentinthemixture. Neithermanualwillplay unlessatleastoneofits ronebarsispulled outpart oftheway,withthe TONEBAREtabpressed,ora presettabIspressed. Theconebarsslideover 9busbars,representing intensitylevels,andeach tonebarhastwocontacts connectedtogetherbya 5600ohmresistor.Asthe tonebarmoves,atleastone ofthecontactsistouching somebusbaratalltiniesand thereforethereisno dead spotinthetonebarmotion. The5600ohmresistoravoids finactualshotcircuitbetween adjacent busbars. Thesebusbarsextendthelength ofthetonebarassemblybutare splitinthemtddletoform two groupsof9(seeFigure5-1.) Thoseintheleftgroup, underthelowermanualtonebars areconnectedtothebaseofthe transistorQ-351.Those onChe rightgroup,undertheupper manualtonebars,areconnected tothebase oftransistorQ-85 throughtheuppermanualTONEBAR namely,TONEEAES and ENSEMBLE.Four presettabs are providedfortheupper manual; namely,TONEBAREandPERCUSSION, STRINGSS,FULLTIBIAS16, THEATERBRASS16 . 1-11PERCUSSION CONTROLTABS-There are 7tabslAichcontrolpercus- sion.Theseoperate ineither theupordownpositionof theupper manualTONEBARS fi PERCUSSIONtab. Whenthe TONEBARSwhen the tabisdown, tonebar effectsand percussionare played simultaneously.For tonebar 1-7 effectsaloneontheupper manualCheseven percussion tabsmust beinupposttton, andtheTONEBAES!idanurainaino BfiochFiozarflBkljlHiHiartyapoHdrrktlalcam.internalssrvKaDparerianicinipo3aII10 lacTiniGJaninrtaiaiOouiLfnavDiiagniridKcidgriaiiycbuminaHvaitagnloaaoev on uposaamataipvisdurJriQrfipdirtM-raBEBambiyaiproaudcoTicwnanii.Topreveniihia.wofh niheprwiLictsirtcuidoniYpfirTmrnadDyrhuewjdan iFLcrouDhiylomiiiHTMiinir pracBulluiianoHuaryfhannaiimiallon Tramlormsflor ihiafMiandlurnHflprMudon,CormociifiBHBiirfirK(aaan andwhenapedalisplayed, approximately+9Visapplied topin19,throughDIO,R49 andtobaseofQ16,QI6is Cumedoffanditscollector switchestoapproximately-15V. ThissignalisfedthroughR46 CobaseofQ15andturns off Q15.Q15isusedasaooise gate,andwhenitturnsoff itallowsany signalwhich appearsonitscollectorto 2-12 becoupledtKrougliC15tothe baseofpedalpreamplifierQ20. WhenaptdalIsdepressed,the 8 and 16 signalsareapplied throughdiodestopins21and 13.The+9Visalsoconnecced tbrouehR50D13cothebase ofQ19,Thispositivevoltage turns onQ19,anditsemitter risestoapproxtmatiely+SVDC. This DC levelisfedthroughR59 , and it providesforwardbiasfor thediode fromthepedalS divideriandthe 8 pedal signal isfedthroughIi60andCL5to thebaseof Q20.Itshouldbe rememberedthatQ15 noise gate wasalso turned off bythe +9VDC,whichthusallowsthe 8 signaltoappearatthebase of Q20. Q20isacommonemitteramplifier, anditscollectoroutputiscon- nectedbacktothepedalpre- amplifierintheorgan. Operationofthe 16 pedal circuitisidenticaltothe abovestateddescription, excepti,Inputand usingPhilipsTC-Ror equivalentcassetteand using100ohmsloadresistor atplaybackoutput,record forapproximately1minute. Adjustplaybacklevelfor 1,0volt;thetotalharmonic distortionshall not exceed5%. SignaltoNoise Ratioan.d MiniinuniOutputLevel:Apply 215mVatIKHztoAuK- Input andconnect100ohms loadresistortoplayback output.UsingPhilipsTC-R orequivalentcassette, recordforapproximately 1minute.Adjustlevel control duringplaybackfor 1.0voltrms.Outputlevel rustdropaminimumof i*0 db atend of recording. PowerSupply:Use-6VUC supply+ 10% E.NoiseandHum:NoiseandHum outputshallbelessthan .06Vonplaybackwithvolume atmaximumwithcassette cartridgeinplay modewith tapestopped. F.Erase Head Efficiency: Minimumof-35dberasureof AOOYizsaturated recording with60maoferasehead current , G.SpeedControlRange:With speedcontrol midposition fredmarkonknob)thetape speedofstandardcartridge PhilipsTCFL3orequivalent shall be 1-7/8ips+3%. Withspeedcontrolin maximumcounter-clockwise positionthetape speed shallbe-10+3%.With speedcontrolinmaximum clockwisepositionthetape speedshall be+10+3%. Slowlyturningthespeed controlthroughtheentire rangeshallprovideasmooth changeinspeed. 2-17RHYTHM III -Theory ofOperation A.MASTEROSCILLATOR-Themaster oscillatorisarelaxation oscillatorcontrolledbya programm-bleunijunctiontran- sistor(PUT).Therateis controlledbyvaryingthe chargingcurrentforCI throughthecontrolpanel mountedpotentiometer.The outputoftheoscillator drivesabuffertransister, whichinturndrivesthe firststageofafive-stage counter. Play.,150ma Record.175maNominal FastForward175ma Rewind.200ma B.COUNTER-Thefivestage counterismadeupof3 dual J-K, DTLflip-flops. One- halfofIC3isusedto providepulses(atabeat rate)tothelamp one-shot 2-U only whenstages2chrough 5ofthecounterare reset by Q3and Q6.Thefive- stagecounternormally countsto32before restarting.Wheneither theWaitsortheSlow Rock rhythmpatternsarecalled for,Cheoutputofthefourth dividerisfedbacktothe thirddivider throughq6. Thisfeedbackpulsewill causethecountertorestart aftera countof24.The outputofthefourthdivider isalsousedtotriggera one-shotthroughR21 andC34, whichdrivesthetempolamp atameasurerate. C.TOUCHSTAETCONTROL -The TouchStartcircuitisa set-resetbistablecomprised oftransistorsQ8 and Q9and reelacors RSiithroughR7i, TheoutputoftransistorQS providessignalsforvoice gatesontheVoicingBoard (124-000180)andalso for generatorgatingcircuits controlledbytransistors Q7andQIO. Whenapositiveinputpulseia appliedtoJl-2(resetinput), transistorQ8providesa ground signalthatturns offthevoicegatingcircuits (Jl-B),andIsinvertedby transistorQ7.Transistor Q7providesapositivesignal totransistorsQ3andQ6 whichresetcounterstage2 through6andenablethebeat ratedivider(Fin9ofIC3), Whenapositivepulseis appliedtoanyoneofthe threestartinputs(Jl-1, Jl-11,Jl-12),theset-reset bistablechangesstate,which enablesthevoicegatesto open,reiaovesthereset signalsfromthecounter stages2through5,turns offthe beatratedivider, andprovidesaresetpulseto the firststage ofthecounter throughcapacitorC4. D.DIODEMATRIX-Theoutputs fromthecounteraredecoded anddifferentiatedbya diode/capicitormatritto formspecificpulsesequences. Thediodematrixhas21output trackswlilcharefedtothe RhythmSelectorBoard. E,fiHYTHMVOICES-Thereare eightrhythm voicesusedin thisrhythmunit.Theyare Bass Drum,LoiConga,High Conga,Claves,Snare Drum, Brush,CymbalandMaracas. TheBrush,Cymbal,Maracas, andthehighfrequencypart oftheSnareDrumare generatedbyshapingand formantingtheoutputof a vAiitenoisesource.The Whitenoiseisgeneratedby areversebiasedtransistor. Theoutputsofthewhite noicevoicesarecombined and fedtoahighfrequencypre- amplifierwhoseoutput appears onJ4 pin2. Theremainingvoices are generatedbyR-Coscillators uhichareturned onby pulse amplifiersthatprovidethe biascurrentfor theoscillators. TheoutputsofalloftheR-C oscillatorsaremixedtogether andthenfedintoalowfrequency pre-ampllfierwhoseoutput appearsonJi pinI,Theoutputs ofbothpre-amplifiersare connectedtoadualvolume 2-15 control,andtheoutputsof thevolumecontrolgoCothe ontputconnector . F,PLAY-A-LONGVOICES - There aretuopulseinvertercircuits, whichinvertinputsignalsfrom thelowermanual legatotrigger circuitandalsofromthe pedal touchmodetriggercircuit. The outputofthelowermanual inverter(J4-1A)canbe switchedtoeithertheBrush input(J4-14)or the Snare flruminput(J4-7)by front paneltabs.Theoutputof thepedalinverter(J<1-13) canheswitchedtoeither theBassDruininput(J4-20) ortheCymbalinput(J4-i) byfrontpaneltabs* 2-16 T-500C TABLEOFCONTENTS PAGE INTRODUCTION1 V SPECIFICATIONSiv SECTIONI - HOWTHEORGANOPERATES 1-1General1-1 1-2TopeSource - 1-1 1-3Pedsa Tones1-3 1-5PedalKeyboard1-6 1-6Harmon!Tonebars1-6 1-8ExpressionPedal1-7 1-9ControlTabs1-7 1-10 Preset Tabs 1-7 1-11PercussionControlTabs - 1-7 1-12VibratoTabs1-8 1-13Reverberation1-8 1-1VolumeSoft,BrillianceTab, andReiterationRateControl1-8 1-15PedalRockerTab,LowerLeftEnd Block1-3 1-16TremoloRockerTabs,Lower LeftEndBlock1-8 1-17 AutoChord 1-8 1-18 Cassette1-3 1-19RliythmIII1-9 SECTIONII-THEORYOFOPERATION 2-1 General2-1 2-2ToneGenerator2-1 2-3VibratoSystem2-1 2-4ManualBusBarAmplifiers 2-i 2-5PedalKeyboardandSwitchPedal KeyetBoards2-i 2-6Pedal Dividerproceedas above, butdonotunsolder wire.Thiswillpermit 3-1 slidertoberemovedfront frontfor Itsreplacement,or tpobreplacement , (c)Toremove(Completetonebar assernbiyunsolderallwires from17tonebarsand6wires terminatingoncontrolpanel. Hemovethreehexheadscrews towardeitherendoftonebar assembly. NOTE Theupperasidlowertonebars canberemovedindividually, aswellasthe pedaltonebar. 3-6PEDAL TONEBARASSEMBLY REMOVAL-ThePedalTonebar AssfiTHblycanbereplaced Independentlybyremoval of twoscrewssecuringthe assemblytothephenolic plate.Removeassembly by slidingCOtherear. 3-7LOWERfrtNUALENDBLOCK fiEHOUAL - <a)Forleftendblock, removetworoundheadscrews thatpassthroughleftside of lowermanualtopcover one inchinsideendblock. (b)Removescrewthatpasses throughanglebracketinto endblack. (c)Forright-handblock. Removetworoundhead screws thatpassthroughright-hand sideoflowermanualtop coverintoendblock. Removetwo1/4hexhead screwsfrom center ometal cassettemountingplate, (c)Removecassettecable connectionsfrom consoletip front stripforclearanceand removecassette. 3-9UPPERMANUAL EtEMOVAL - (a)Removefourscrews that retainmetalcaver on control panelassembly. (b)Removetwomountingrear boltsfromuppermanualend blocks . (c)Removetwoscrewsthat passthrough anglebrackets into upper manual.These bracketsarelocatedonthe insidesurfaceofcheek blocks Thesescrewsareaccessible fromfrontof organ. (d)Tiltuppermanual upand blockinthis position. Removeuppermanual front strip. (e)Snapoffharnessclamp fromleftsideofmanual by pullingforward. (f)Unsolderallwires from terminalstrips (g) Return manualtonormal position. (h)Unplugbus barwires from uppermanualatbus amplifier, (i)Removeallgrounding terminationsonrear ofupper manual.Release 3plastic cableclamps andremoveline boK. 3-3CASSETTEREMOVAL - <a)Removesix(6)philllps headscrewsfromuppermanual frontstrip. (b)Removeone1/ihex head screwfromrecessedholein leftfront railtrimblock. Removetonebarassembly and base,as aunit,byremoving sixscrewssecuring itto uppermanual. (j) Removemanual from casework. 3-2 3-10LOWERMANUALREMOVAL - 3-12POWERAMPLIFIERREMOVAL (a)Performoperationsa ChroughdInParagraph3-S (b)RemovetwoLower control panelsasdescribedunder Paragraph3-7.Unplugbus barwiresfromlowermanual atbusamplifier. (c)KeanovetwomountiTigend blocksandloosenfour screwsattachingmanualto frontrail. (d)Raiseupperokannaland removelower manual. Reverseprocedurefor re-inaCalling. 3-11TONEGENERATORREMOVAL - (a)Unsolderallharness connectionsfromthegenera- tor terminalstrip. (b)Ranoveheavygroundulre Incenterofgenerator. (c)RemovetheACcover panel andunsolderthefivewires fromharness. (d)Removethefourbolts whichsecuretonegenerator tosupportbrackets. (e)Removecontrolpanel cover byremoving4screws. 1.Removethebrown,red, orange,andyellowwires fromtheterminalsbe- hindtheVibratoSmall switch. 2.Removethegreen,blue, violet,grey,andwhite wiresfromtheright-hand endofthelinebox. 3.Unplugshieldedcable from pins 2 Measuredistance fromendofcontrolassembly toarside oftab.Mark correspondinglengthon drivingtod.Endofrodwill beconcealedbyplastic sleevesand cannot be observed. A.Pull backdrivingrod sufficientlytopermit removaloftab . NOTE Blackrubberspacerson pivotrodmustbesaved,and returnedtooriginalposi- tionswheninsertingnewtab. 5.PulltabasECDiblytoward rearof controlassemblyto Temove. CAUTION Savetabactuatingsprings forre-use, INSERTIONOFNEWTAB - To Insertanewtabproceed accordingtothefollowing; 1.Inserttabassemblyfrom rearofcontrol.Position tabsochatdrivingrodcan 4-2 bepushedthroughtab,and push or drivecodtomeet originalpivotrod. andpositionsofsprings. Takenecessarycorrective measures . NOTE Reinstallanyrubberspacers andplastic sleevespreviously removed. 2.Driveoriginalpivotrods backtooriginalpositions, 3.Reattachspringclipsto endsofpivotrods- A.Reattachtwotabactuating springsaccordingtothe following: (a)Noteconditionofspring. Open ends mustbewellsepara- ted.Bendspringtoshapeif necessary, (b)insertdoubleUbendof springinto endofasmall drivesocketorothersimilar convenienttool , (i2Bymeansofthe tool, placespringwithclosedend towardtabassembly,sothat closedendengagesextruelon intabbracket. (d)Withtheaidofthetool, positionOpen endofspring toengageextrusioninbottom ofcontrol, (e)Whenboth endsofspring areproperlyengaged,remove tool.Iftheforegoingsteps havebeenperformedproperly, thespringwillappear astwo parallelarms. (f)When bothspringshave beenattached,operatetaba fewtimestoassurethat actioniscorrect.Ifaction Isnotcorrectcheck shape COMPLETIONOFWORK - After ascertainingthattabIs operatingproperly,reattach associatedswitchassembly. Besurethatswitchcontact armsareproperlyseated aboveandbelow actuating edgesoftabs. Reassemble organbyreversing orderofdisassembly. 4-4TREMOLO SPEAKER MAINTENANCE A.LUBRICATICl-Motor and rotorshaftsshould beoiled once ayear. Forlubrica- tionitisnecessary tore- movetheTremolounit from theconsole. Hanunond generator Oilcan be usedas alubricant. OT0R(DRUM)SHAFT- The outsidebearinginthe rotor supportmaybelubricated by applyingafewdrops ofoil tothefeltpadaround the bearing. TheInsidebearing may be lubricatedthe same wayand isaccessiblethrough the throatof the drum.BE CAREFULNOTTODRIP OILOH THEDRIVEFULLY OR SPEAKER CONE. M:T0R - Anoilinghole is providedinthe frontplate ofthelargemotor to facilitatelubrication of the frontbearing. This 4-3 Isaccessiblethrougha largeholeintherearof theTremolospeakerassembly. LubricationofCherear beatingothelargemotor willrequiretheremovalof thesmallmotorandthe drive wheel. LubricationofChesioall motorbearingsisaccompli- shedbyapplyingoilto theshaftsandfeltpads ateachendofthemotor. BE SURE THAT THEPORTIONOF THETOTOREHAET THATMAKES COWTACTWITHTHEDRIVE miEELISFREE OFOIL. E.SPEAKERREPLACEMEHT - 1.RemovetheTremolo speakerassemblyfrom console . 2.Removebackcoverby removingnineflathead woodscrews. 3.Removeacoustical materlal- 4.Removefourscrews securingspeakertobaffle. Mostroutineserviceopera- tionsareoutlinedonacard located ontheunit.They arealaoreproducedbelow. Thebelttensionmaybe adjustedwithoutremoving unitfrom console.Forb