Specifications

Maxiva UAX
October 17, 2013
5‐61
888‐2693‐004 WARNING:Disconnectprimarypower priortoservicing.
Copyright©2013,HarrisBroadcast
Pins1and3normallyha ve12Vapplied(viapin2)buteither1or3ar egroundedbrieflytomaketheswitchchange
positions.Measuring12Vbetweencaseandpins1,2 &3isnormalexceptduringaswitch.
There
laycanbeswitchedmanuallyifpins1or3aremomentarilygroundedtothecasewithascrewdriveror
jumper.IftheTCUisofforiftheTCUhasfailedthe12voltswillnotbepresentonpins1,2or3andLPUswitching
willbedis
abled.
Pins5,6&7ar
eusedforstatus.ThestatussignalsareusedbytheTCUtodisplaythecorrectrelaypositiononthe
GUI.Pin6isground.DependingonswitchpositionPin6connectstoeitherpin5orpin7tosendagroundindication
(status)backtotheTC
U.Thepinnotgroundedwillmeasure12V.
5.9.16.1 LPUCoaxialRelayBypassProcedure
Shouldthecoaxialrelayfail,orifaTCUfailurecausestherelaytobecomeinoperative,itcanbemanuallybypassed
usingthefollowingprocedure.
STEP 1
Turnoffthetransmitter.
STEP 2 DeterminewhichLPUwillbeusedastheMasterLPU.IftheTCUhasfailed
theMasterandSlavesettingsontheLPUsmustbesetmanuallyviatheLPU
controlpanels.SettheLPUthatistobeactivetoMastermodebypressing
theSetupbuttonontheLPUfr
ontpanels,thenpresstheenterbuttonto
opentheSystemSettingsmenu,presstheupbuttononetimetodisplaythe
DriverModesetting.Ifthemodeisincorrectpresstheenterbutton,then
usetheupordownkeytoselectthedesiredvalue(masterorslave).Press
entertoselectth
edesiredvalue.
STEP 3 RepeatSTEP2andsettheLPUthatwi llnotbeactivetoSlavemode.
STEP 4 ToconnectLPUAtothePABorsplitterdisconnectRFcableslabeled97and
90fromtherelayanduseatypeNfemalebarreltoconnectthemtogether.
Disconnectcables89and96anduseatypeNbarreltoconnectthem
together.ThissendsLPUBoutputtoalo
adandLPUAoutputtothesplitteror
PAB.ToconnectLPUBtothePABorsplitterdisconnectRFcableslabeled97
and89fromtherelayanduseatypeNfemalebarreltoconnectthem
together.Disconnectcables90and96anduseatyp e Nbarr
eltoconnect
themtogether.ThissendsLPUAoutputtoaloadandLPUBoutputtothe
splitterorPAB.
STEP 5 TurnonthemasterLPUandmonitorforwardandreflectedpowertobesure
normaloperationisrestored.
STEP 6 Endofprocedure.
5.10 PABMaintenance
ThissectionisamaintenanceguidetothePAB(PowerAmplifierBlock).
EquipmentandTo
olsRequired:
Thef
ollowingtoolsarerequiredtoperformthemaintenanceproceduresdescribedinthissection:
• 1setofcross(Phillips)screwdrivers
• 1setofeven(straightslot)screwdrivers
• 1setofhexdrivers(nutdrivers)
• Torquewrench(forSMAconnectors)
• 7mmopenendorsocketwrench
5.10.1 PAModuleRemoval
ThePABcanoperateindefinitelywithanycombinationofPAorPSmodulesremoved.Thereisnorequirementtofi ll
thevacantslotleftbyaremovedmodule withafillerplateor“dummymodule”inordertobalanceairfloworRF
impedances.Air“choke”holesbehindeachmoduleproperlybalanc
etheairflow,evenwhenmodulesareremoved.