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1、737-600/700/800/900FAULTISOLATIONMANUAL801.BusPowerControlUnitBITEProcedureFigure201A.General(1)YoudotheBITEprocedureatthefrontpaneloftheBusPowerControlUnit(BPCU).(2)TheBPCU,G15isinstalledontheE4-2rackinthemainequipmentcenter.(3)TheBPCUperformsaselftestafteritispoweredupormanuallybypushingtheBPCU
2、TESTswitch.TheBPCUhasthreefaultindicatorlights,oneBPCUPASSlightandonetestswitchonthefrontpanel.Thefaultindicatorlightswillbereferredtoasmaintenancemessagesthroughoutthisprocedure.(4)Thefourindicatorlightsarelistedinorderbelow,withthehighestpriorityindicatorlistedfirst.NOTE:Ifthereismorethanonefau
3、ltcondition,onlythehighestpriorityfaultindicatorlightwillbeon.(a)BPCUFAULT(b)EPDIST/BUSFAULT(c)EPCFAULT(d)BPCUPASS(5)TheBPCUwilldetecttheexternalfaultswhenexternalpowerisbeingsupplied.NOTE:TheEPDIST/BUSFAULTcanbedetectedandshownbytheBPCUwhentheAPUgeneratorissupplyingpower.(6)UsethemanualBITEproce
4、duretoclearthefaultindicationsfromtheBPCUmemory.NOTE:Recordthemaintenancemessages(ifany)beforeyoudothemanualBITEprocedure.B.PrepareforTest(1)TurntheBATswitchontheP5-13paneltotheONposition.NOTE:TheBPCUBITEprocedurecanberunwithexternalpower.Ifyouunabletoapplyexternalpowertheprocedurecanberunwithbat
5、terypower.C.BITEProcedure(1)DothesestepstodotheBITEprocedurefortheBPCU:(a)Recordanymaintenancemessages(ifthereareany)beforeyoupushtheBPCUTESTswitch.NOTE:Ifyouremoveandreapplypower,thiswillnoteraseanyofthefaultsthatweredetectedbytheBPCU.However,ifthefaultisnolongerpresentandtheBPCUTESTswitchispush
6、ed,thefaultwillbecleared.(b)PushandholdtheBPCUTESTswitchontheBPCUforaminimumofonesecondandthenreleaseit.(c)Makesureallfouroftheindicatorlightscomeonforapproximatelythreeseconds:1)BPCUFAULT-(red)2)EPDIST/BUSFAULT-(red)3)EPCFAULT-(red)4)BPCUPASS-(green)(d)Makesureallfouroftheindicatorlightsgoofffor
7、approximatelythreeseconds.(e)Ifnofaultsweredetected,theBPCUPASSlightwillcomeonforapproximatelysevenseconds.EFFECTIVITY24-41TASK801XIAALLPage201D633A103-XIAFeb10/2005BOEINGPROPRIETARY-Copyright#UnpublishedWork-Seetitlep
