Ampex-400-tape-sm维修电路原理图.pdf

AMPExSERIES4b0OPERATIONANDMAINTENANCEMANUALSERIES400RadioFans.CN 收音机爱 好者资料库MODELS402&403COP4SOIEAMPEXELECTRICCORPORATIONREOW000CITYCALIFORNIARadioFans.CN 收音机爱 好者资料库MODELS402&403TWOCASEpORTABLEAMPEXELECTRiCCORPORATIONREDWOO0CITV,CALIFORNIAINSTRUCTIONMANUALFORAMPEXMAGNETICTAcbERECORDERMODELS400A,401,402,403,404and405TABLECFCONTENTSSECTIONISpecificationsSECTIONIIInstallationSECTION111OperatingProcedureSECTIONIVOperatingTheorySECTIONVRoutineMaintenanceSECTIONVIElectronicsAlignmentSECTIONVIIMechanicalServiceGuideSECTIONVIIIMechanicalAdjustmentsSECTIONIXPartsListFIGURE0ReelHoldDownKnobFIGURE1SingleCasePortableElectronicAssembly SchematicFIGURE2Rack,Console,TwoCasePortableElectronicAssemblySchematicFIGURE3SingleCasePortablePowerSupplySchematicFIGURE4Rack,Console,TwoCasePortablePowerSupplySchematicFIGURE5ControlCircuitSchematicFIGURE6InputTransformerConnectionsFIGURE7RemoteControland60CycleAmplifierConnectionsFIGURE8PlaybackAmplifierEqualizationFiGURE9RecordAmplifierEqualizationFIGURE10SingleCasePortableElectronicPssembly-FrontViewFIGURE11SingleCasePortableElectronicPssembly-TopViewFIGURE12SingleCasePortableElectronicssemnbly-BottomViewFIGURE13Rack,Console,TwoCasePortableElectronicAssembly-FrontViewFIGURE14Rack,Console,TwoCaseortableElec.Assy.-Top&RearViewFIGURE15Rack,Console,TwoCasePortableElec. Assy.-BottomViewFIGURE16MechanicalAssembly-TopViewFIGURE17MechanicalAssembly-BottomViewFIGURE18MechanicalAssembly-RearViewFIGURE19MechanicalAssembly-SideViewFIGURE20ReelIdlerandFlywheelFIGURE21ConsoleCabinetFIGURE22MechanicalAssemblyCaseSERIES400INDEXSECTION1SPECIFICATIONS-MODELS400A,401A,402&403TheAmpexModels400A,401A,402and403magnetictaperecordersareaudiorecordersutilizingthestandard1/4inchwidetape.Models400Aand401Pareidenticalineveryrespectceptfortheheadassembly.Similarly,theModels401and403arealikeexceptforheadassemblies.ThemaindifferencebetweenthesetwogroupsistheformerincorporatesanElectronicAssemblydesignedforsinglecaseportablemounting.The400Aand402incorporatehalftrackerase,recordandplaybackheads.The401Aand403incorporatefulltrackeraserecordandplaybackheads.Halftrackheadsareeffectiveoveronly onehalfofthetapewidth.Thus,amachinehavingahalftrackrecordheadcanrecordtwoseparateaudiotracksonastandardreeloftape.Machineshaving halftrackplaybackheadscanreproduceeitherfullorhalftrackrecordings.Machineshavingfulltrackplayback headscanonlyreproducetapesonwhichasingletrackhasbeenrecorded.Headassembliesincorporatingfulltrackrecordanderaseheadsandhalftrackplaybackheadsareavailableonspecialorder.Thisallowsrecordingfulltracktapesandplaying backeitherfulltrackorhalftracktapes.Allofthemodels produceatapefrequencycharacteristicwhichhasbeenacceptedasstandardfortheexchangeofprogramsbytheNationalAssociationofRadioandTelevisionBroadcasters.TAPESPEELt15inches persecondand7-1/2inches persecond,withmotoripiea&hThjuind equalizationswitches convenientlylocated.FRECUENCYRESPONSE.Pt15inches/2db30-15,000cyclesAt7-1/ainches/2db40-10,000cycles/4db30-15,000cyclesSIGNAL-TO-NOISERATIO.Over65 dbunweightednoisetomaximumrecordinglevelT.Over55db,asmaffiedbyNARTBstandards.ByNARTBdefinition,thesignal-to-noiseratioistheratioofpeakrecordingleveltothetotalunweightedplaybacknoisewhenerasingasignalofpeakrecordinglevelandintheabsenceofanewsignal.Thus,biasanderasenoiseareincluded,aswellasplaybackamplifiernoise.P.11frequenciesbetween50and15,000cyclesare measured.Thepeakrecordinglevelis definedasthatlevelatwhichtheoverallinputtooutputtotalRMSharmonicdistortiondoesnotexceed3%whenmeasuredona400cycletone.STARTINGTIME.Instantaneous.Whenstarting,thetapeacceleratestofull speedinlessthan1710secondbecausethecapstanmotoroperateswheneverthepowerison.STOPPINGTIME.Whenplayingat15inches persecond,thetapemoveslessthantwoinchesafterthestopbuttonisoperated.MODEL400A, 401A,402&403,SECTION1,Page111/1/52FLUTTERANDWOW.At15incheswell under2/10%RMSmeasuringallfluTtooeitflThm0to300cycles usingatoneof3,000cycles.At7-1/ainchespersecondunder1/4%.PLAYBACK TIMINGACCURACY.2/10% or/3.6secondsin a30minuterecording.PLAYINGT1ME.32minutesat15inchspeed withstandardNARTBreel;64minutesat7-TRinchspeedoneachtrack.ThestandardRMAreelmayalsobeusedonthetapesupplyturntable.TheModels400Aand402MagneticTapeRecordersaredesignedtorecordononly onehalfofthestandard1/4inchwidetapeinaccordancewithRMAstandards.Byturningthereeloverandrecordingontheother half,twicetheamountofprogramcanbestoredonasinglereel,therebyaffectinga50%savingintape.REW1NDTIME.Approximatelyone andahalfminutesforthefull2,400footNARTBreel.CONTROLS.FourbuttonscontrolthefunctionsofStartPlay,FastForward,ewi5dinZStop.Aseparaterecordbuttonenergizestherecordrelay,whichdropsoutwhenthemachineisstopped.Sincethefunctionsare relayoperated,thecontrolbuttonsmaybeplacedataremotelocation.COMPLETELUG-INHEAD HOUSING.Erase,recordandplaybackheadsarecontainedin asingleplug-inheadhousing.SIMULTANEOUSMONITORING.Independentrecordandplaybacksystemsallowthetapetobemonitoredwhilerecording.INUTJswitch allowstherecordertoaccommodateeithermicrophonelevelFoIiipedanceinputortobridge600ohmsplus4 VUline balancedorunbalanced.Minus70dbmonmicrophoneinputwillproducerecommendedrecordlevel.PLAYBACKAMPLIFIER.Plus4 VUoutputinto600ohmsbalancedorunbalanced.Willfeedhiglflmpedanceamplifierdirectlywithapproximatelyonevolt.METERING.A 4inchVUmeterismountedonthefrontpanelandprovidesfor:A.Directmonitorofrecordinputsignalbeforeorduringrecording.B.Monitorofrecordedoutputsignalfromplaybackheadwhilerecordingorduringplayback.C.Readingbiascurrent.D.Readingerasecurrent.MODEL400A, 4OlA,402&403,SECTION1,Page211/1/52PHONE MONITORING.Aphonemoniwrjackisprovidedfordirectmonitorofeod1riuTiijhaTforeorduringreco.ding,andmonitorofrecordedoututsignalftomplaybackheadwhilerecordingorduringplayback,.tn4-Bswitchisincorporatedinorderthatdirectcompatsoncanoemadeaetneentheoriginalp1ogramandtherecordedprogramwhilearecordingisbeingu-4ade.ThesameswitchtransferstheVUmeterfor level comparison2ndmonitring.AOUNTINGS.Models400Aand401Pareavailableasasinglecase portable.c4sdels40lnd403areavailableinaconsolecabinet,for rackmountings,oras atwocaseportable.POWERINUTRECUIREMENTS.115VoltsAC2Amperes.RecordersareavailableIoiither60or50cycleoperation.Secserialdumberplatebeforeoperating.DIMENSIONS.StngleCa5ctortable_CompleterecorderinsinglecaseHeight-13-3/4inchesWidth-20inchesDepth-17-1/2inchesWeight-83pounds,approximatelyRackMounting-Standard1widepanel-CommercialaoLchingMechanicaUnit-15-3/4highpanelElectronicUnit-7highpanelPowerSupply-3-l/23ighpanelStudtjConsole-CompleterecorderincabinetHeight-32nchesWidth-23inchesDepth-zs-i/zirihesTwoCasePortable-MechanicalandelectronicassembliesinseparatecasesMechanic.lAssembly:7/idth-21inchesDepth-iSinchesHeight-iSinchesWeight-62poundsElectronicassemblyinlargecasehasextrsspacefor four-channelmb:eror forstowageofcablesandmicrophoneWidth-21inchesDepth-13inchesHeight-19inchesWeight-lessmixer-50poundsVIODEL404,401A,402&403,SECTIONI,?age311/1/52ElectronicassemblyinsmallcasespzceforpowersupplyandelectronicscnlynoextraspaceWidth-21inchesDepth-13inchesHeight-12inchesWeight -45pounds,approximatelyACCESSORYITEMS.Allrecordersinthe400seriesareavailablewithconnectorsinsta.leiintheMechanicalAssemblyforpluginofremote controls,theModel:75Precision60cyclePowerSupply,ortheModel80SpeedIockEquipme:.t.The Model375Precision60CyclepowerSupplyisdesignedtoprvideasourceofconstantfrequencytothecapstandrive motorinlocalitieswheetheavailable60cycle powerIsnotstableinfrequency.The Model380SpeedLockEquipmentisdesignedtoautomatically:ontroltheplaybackspeedofSeries400recorderstosynchronizewithmotionrctureequipment.Premotecontrolboxisavailablewithfivepushbuttonsandtwoi.iticatorlightsmountedona slopingpanelinasmallwoodencase. Catalogii3766.Thisunitiswiredandreadytoope.rate.-Pisoavailableareremotecontrolson aflatplateforflushmountinginst4diocontrolconsoles.Catalog#3766-1.Thisunitisnotwired.Wiringmustbedonebythepurchasertafit hisinstallation.AfourchannelhighlevelMiser-Preamplifieris.availableforusewithModels402and403rackm-itaiidportablerecorders.Catalog#3761,AnaccessorypedestalisavailableforModel402and403StudioConsolestoincreasetheir heircto41inchesCatalog#3795.Asetofcastersisalsoavailable fortheStudioConsole.Catalog3963,MODEL400ft,4011,401&103,SECTIONI,rage411/1/52SECTIONIlINSTALLATiONIMPORTANT:Beforeoperatingtherecorder,readthefollowingsectionsonINSTLLATIONandOPERATION.CAUTION:Donotattempttolengthentheheadcables.Additionalcablecapacitywillaffectthefrequencycharacteristics.ConsoleModels:Shippedinreadytooperatecondition.Connecttheinput,output,inJACprisfollows:Removethelowerscreencoveratrearofcabinet.Pullthecablesthroughbottomofcabinetand plugthem intorearofElectronicsAssembly.Forconnectioninstructions,seefollowingparagraphs.Replaceprotectivescreencoveringtorearofcabinet.IMPORTANT.Theconsolecabinetmustbespacedatleast4fromthewallintherearandatleast3betweenawallorcabinetoneitherside,otherwiseventilationholeswillbeobstructed.TwoCasePortableModels:Theportablemachineisshippedinareadytooperatecondition,exceptfortheconnectionofinterconnectingcables.TooperatetherecorderplacetheMechanicalAssemblyCasetotheleftoftheElectronicAssemblyCase.UnlatchandremovethetopcoverandcableaccessdoorontherightsideoftheMechanicalAssembly Case.UnlatchandremovethefrontandreardoorsontheElectronicAssembly Case.Uncoil theinterconnectingcablesfrombehindthecableaccessdoor andplugthem intomatingreceptacleattherearoftheElectronicAssembly.Connectthe input,output,andACpowertorearofElectronicAssembly.SingleCasePortableModels:Thesemachinesareshippedin areadytooperatecondition.Removethefrontpanel coverandthetopcover.Allconnectionsarereadily accessiblefromthefrontpanel.NOTE:NhenstoringtheportablemachinesavoidsettingtheMechanicalAssemblycaseoneitherofthehandleends.ThiswillcausetheTurntableMotorTiretorestontheBrake Drumandwillproduceaflatinthetireifleftinthispositionanyappreciabletime.RackMountedModels:Therackmountedmachineshouldbemountedon astandardT91nhrliiakw1ththeMechanicalunitabovethemainElectronicPanel.TheElectronicPowerSupplyPanelshouldbemounteddirectlyabovetheMechanical/ssemblytopreventthepossibilityof 60cyclefieldfromenteringtheElectronicAssembly.SERIES400SECTiON11,Page1ii/i/sz-IftwoSeries400Recordersaretobeirountedonastandardrack,thefollowingplacementisrecommendedstartingatthetopoftherack;1.Installaspacerpanelatthetopoftherackifdesired.2.InstallbelowthispaneltheMechanicalAssemblyformachine#1.3.InstalltheElectronicAssemblyformachine#1.4.Installaspacerpanel.5.InstalltheMechanicalPssemblyformachine#2.6.InstalltheElectronicAssemblyformachine#2.7.Installaspacerpanel.8.InstallbothPowerSupplyPanelsatthebottom.Thecableonthepowersupplyfortheupperrecorderwillhavetobeextendedinlength.Extension cable#3814isavailable forthispurpose,ThenumberssetoffinparenthesesinthefollowingtextarereferencenumbersthatrefertothePartsListSectionIXandthefiguresintherearofthisbook.I.ConnectthePower Cable,catalog#2413,fomtheACPowerInputConnectorJ4092ontheElectronicsAssemblytoasourceof115VoltPCpower.IMPORTPNT:Thtsmachineisavailable foreither50or60cycleoperation.ThepowerlinefrequencyisindicatedontheserialnumberplatewhichislocatedonthePowerSupplyPanel for rackmountedmachinesandontheexteriorofeachcaseintheportablemachine.Ii.OlTT:RefertoFigure1or2.A.ForStudioLine:Plus4VU,600ohmlineoutput,balancedorunbalanced,isavailableacrossTerminals2and3oftheLineOutConnector,.7404,Pin1isthechassisground,ifunbalancedoutputisdesired;tieeithersideofthelinetoground.Itisnecessarytosupply600ohmterminationtothisoutputatalltimesinordertomaintaincorrectmetercalibrationwhilerecordingorplayingback.Therefore,iftheoutputisnotfeeding aterminatedlineoriftheoutput is notconnected,suchasonremotepickups,theLineOutputTerminationSwitch,5404,mustheswitchedtoON.B.ForConnectiontoHighimpedanceAmplifierInput:Connectpin3oftheLineOutConnectorJ404,tothehighsideoftheamplifierinput.Strappins1and2oftheconnectorandconnecttothegroundsideoftheamplifierinput.TheLine OutputTerminationSwitchS404,mustbeleftinthepositiondesignatedONatalltimes,asexplainedinAabove.SERIES400,SECTIONii,Page211/1/52ill.iNPUT:RefertoFigures1or2and6.Thefollowing inputsareprovided:A.Microphones:Anylowimpedancemicrophone,thenominalimpedanceofwhichisintherangeof30to250ohmscanbepluggedindirectly.Connectthemicrophonetopins2and3oftheInputConnector,3401S.Connectcableshieldtopin1.PlacetheInputTransferSwitch,S40l,intheMICposition.Themicrophoneinputtransformerisstrappedfortheoptimumstepupfora150to 250ohmsource.Inthecaseofmicrophoneshaving50ohms orlessimpedance,6dbadditionalgaincanbeobtainedbystrappingtheinputas showninFigure6B.Thisis notusuallynecessary,however,and shouldnotbedoneunlessinsufficientgainisfoundtoexist.Iftheinputisre-strapped,seriousfrequencydiscriminationwillexistshouldtheinputbefedfromasourceimpedancegreaterthan50ohms.IMPORTANT.R402andR403 willhavetobechangedto24ohmsandP401andP404to68,000ohmstomaintainaflatresponseonBalancedBridgingwhenthetransformerisstrappedfor50ohmsourceimpedance.Highimpedancemicrophonesarenotrecommendedforuseonthisequipment.Ingeneral,thequalityobtainablefromhighimpedancemicrophonesis notsatisfactoryforprofessionalwork.Intheeventthatitbecomesnecessarytoconnectahighimpedance microphone,theinputcircuitwillhavetobere-wiredas showninFigure6A.B,Bridging a BalancedStudioLine:Connectabalancedlinetopins2and3oftheInputConnector,J4O1S.Pin1isground.PlacetheInputTransferSwitch,S401,intheBALANCEDBRIDGEposition.Inputlevelsofminus10toplus10VUcanbeaccommodated.Theloadplacedonthelineisapproximately300,000ohms.Forbridginghigherorlowerlevellines,anexternalbridgecanbewiredintheline tothemachine.Thiswouldconsistoftworesistors,thevalueofwhichshouldbefrom15,000 to30,000timestheRMSprogramvoltage,inserieswitheachsideoftheline.A24ohm/5%resistorshouldterminateeachlegoftheoutputsideofthetwobridgingresiiiors.Thejunctionofthetwo24ohmresistorsshouldgotochassisground.Theoutputofthebridgemustbefedtothemicrophoneinputoftherecorder.Theinputoftherecordermaybeconnectedforanyimpedancefrom50to250ohm.C.BridginganUnbalancedSource:Connectanunbalanced line,radio tuner,etc.,topins3and1oftheInputConnector340iS.Pin1isthegroundside.PlacetheInputTransferSwitch,5401,intheUNBALANCEDBRiDGEposition.This connectionprovidesa60,000ohmbridginginputforanyRMSprogramvoltagegreaterthan1/2volt.SERIES400,SECTIONII,Page311/1/52Toincreasetheinputimpedanceabove60,000ohms,aseriesresistanceof 330,000ohmscanbewiredintotheinputpluginserieswithpin3andth-inputcable.Thiswillnecessitateaninputvoltageofatleast2-1/2voiRMS.ItisimportantthatthisresistorbephysicallyplacedinthecableconnectorthatplugsintotheRecorderInputJ4O1Sinorderthatthecablecapacitybeontheinputsideoftheresistor.IV,PHONES:AnysensitiveheadphonescanbepluggedinthePhoneJackJ403S,providedfor monitoringtheincominglineorplaybackoutput.V.REMOTE CONTROL:RefertoFigure7.ItispossibletoremotecontroltheStart,Stop,FastForward,Rewind,andRecordpushbuttonsofthisrecorder,OnstandardrecordersconnecttheremotecontrolsshowninFigure7AtotheRemoteControlTerminalStripT5502showninFigure18.ineightwire cableisrequired.ifthistaperecorderisequippedforpluginofremotecontrols,connecta10pinmaleJonesplugJonesP-310-CCT-L,MPEX