Specifications

Section-5 Maintenance
November 11, 2013
5‐44
Copyright©2013,HarrisBroadcast
WARNING:Disconnectprimarypowerpriortoservicing. 888‐2628‐300
5.14.8 TCUPSModuleMaintenanceandReplacement
TheTCUPSModules(front)areshowninFigure5‐33onpage5‐39.ThePSmodulessupplytherequiredvoltagesto
theTCUcardsandfrontpanel.ThePSmodulesarenothotpluggable.
TheTCUpowersupplymodules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cleanedasneeded.Thefiltersarewashableandcanberemovedfromthefront
panel,washedwithsoapandwater,driedthoroughlyandthenreplaced.
Figure 5-38 TCU PS Module Fan
Duringtheperiodicinspectionsbesurethatthefanisoperatingefficiently.ThefandrawsairintothePSmodule.
WiththeTCUoperating,holdasmallstripofpaperdirectlyinfrontofeachPSfanandbesureitispulledintoward
thePSface.Ifthefan
isnot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cover,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appropriateACplugontheTCUrearpanelorbyturningoffthe
Control1circuitbreakerforPS1(nexttothecabinetwall)orControl2circuitbreaker 
forPS2.
STEP 2 Usea#1Phi llips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.
Note
A faulty power supply could be safely removed from the TCU chassis while the TCU is energized but the
PS should never be installed without removing AC power from the TCU. Plugging the replacement PS into
an active TCU could permanentlydamage the PS card edge.
STEP 3 SlidethereplacementPSmoduleintotheTCUchassistakingcaretoaligntheupper
andloweredgesinthechassisalignmentslots.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.