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Section-5 Maintenance

October 17, 2013

5‐40

WARNING:Disconnectprimarypower priortoservicing. 888‐2693‐004

TheMasterdipswitch(S4)shouldhaveposition1settoOnifthecabinetisthemainPAcabinetinsingleormultiple

cabinetsystemorsettoOffifitisasecondarycabinetinamultiplePAsystem.

5.8.8 TCUPSModuleMaintenanceandReplacement

TheTCUPSModule(front)isshowninFigure5‐20onpage5‐36.ThePSmodulesuppliestherequiredvoltagesto

theTC

Ucardsandfrontpanel.ThePSmoduleisnothotpluggable.

TheTC

Upowersupplymoduleshouldbecheckedperiodicallytobesurethatthereisnotexcessivedirtbuiltupon

thefancover.Ifdirtbuildupisevidentuseavacuumcleanertocleanoffthefrontcover.ThefiltersintheTCUfront

panelshouldalsobecheckedandcleane

dasneeded.Thefi ltersarewashableandcanberemovedfr omthefront

panel(seeSection5.8

.9onpage5‐41),washedwithsoapandwater,driedthoroughlyandthenreplaced.

Figure 5-24 TCU PS Module Fan

Duringtheperiod

icinspectionsbesurethatthefanisoperatingefficiently.ThefandrawsairintothePSmodule.

WiththeTCUinoperation,holdasmallstripofpaperdirectlyinfrontofthefanandbesureitispulledintowardthe

PSface.Ifthefanisno

tfunctioningproperlyitshouldbechanged.SimplyremovethePSfromtheTCUusingthe

instructionsthatfollow,unplugthefan,removethetwoscrewsthatholdthefanonthefrontpanel,andremovethe

fan.Thereplacementfanpartnumberis952‐9252‐006.

STEP 1

DisconnectTCUfromACmainspowersource.Thiscanbeaccomplishedby

disconnectingtheACplugsontheTCUrearpanelorbyturningofftheTCU

circuitbreaker.

STEP 2 Usea#1Phillipsorscrewdrivertoloosenthesinglefasteneronthetopfront

ofthePSmodule.Whenthefastenerislooseuseittopullthemoduleoutof

theTCUchassis.

STEP 3 SlidethereplacementPSmoduleintotheTCUchassistakingcaretoalignthe

upperandloweredgesinthechassisalignmentsl ots.BesurethePSmodule

connectorslineupandseatintotheconnectorintherearoftheTCUchassis.

STEP 4 TightenthefasteneronthetopfrontofthePSmodule.

STEP 5 ApplyACmainspowertotheTCU.ThegreenLEDontheupper,left,front,of

thePSmoduleshouldlight.

STEP 6 Endofprocedure.

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