User's Manual

LTEeNodeBIndoorHardwareInstallationBCUIIFanTrayReplacement
BCUIIFanTrayReplacement
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Objectives
Theprimaryobjectiveisasfollows:
•RemovetheBCUIIcardcageassemblyfromtheframe
•ReplacethefantraylocatedontherearpaneloftheBCUIIcardcageassembly
•ReinstalltheBCUIIcardcageassemblyintheframe
Introduction
ThefantrayismountedintherightsideoftheBCUIIrearpanelasviewedfromtherearofthe
BCUII(seeFigure8-5).Thefantraycontainsasinglefan.Thefandrawscoolairinfromtheair
intakelocatedalongthefrontoftheBCUII.ThecoolairpassesthroughtheentireBCUIIand
over/underalloftheBCUIIinternalcircuitry .Thefanexhauststhecoolingairouttherearofthe
BCUII.TheelectricalconnectionsforbothDCoperatingpowerandthefancontrol/monitoring
signalsaremadethroughacablethatispartofthefantray .Thefantraycableconnectorplugs
intotheBCUIIbackplane.Thisconnectionismademanuallyandisaccessiblethroughthefront
oftheBCUIIafterremovingtheSiteControllerandModem1cards.
Preparation
Requiredtools
ThefollowingtoolsarerequiredtoremoveandinstallaBCUIIfantray .
•T20TORXbit
•Torquedriver
•ESD(Electro-StaticDischarge)conductive,highimpedancewriststrap
Torquerequirements
WheninstallingtheBCUIIfantray ,tightenthecaptiveM4mountingscrewsto:
•2.3N-m(20in-lbs)
68P09308A55-68-25
FEB2010