CAUTION:
Theheatsinkandmicroprocessormightbeveryhot.Turnoffthecomputerandwaitthreetove
minutestoletthecomputercoolbeforeremovingthecomputercover.
Toreplacethesystemboard,dothefollowing:
1.Removeallmediafromthedrivesandturnoffallattacheddevicesandthecomputer.Then,disconnect
allpowercordsfromelectricaloutletsanddisconnectallcablesthatareconnectedtothecomputer.
2.Removethecomputercover.See“Removingthecomputercover”onpage69.
3.Laythecomputeronitssideforeasieraccesstothesystemboard.
4.RemoveallmemorymodulesandPCIcardsthatarecurrentlyinstalled.See“Installingorreplacinga
memorymodule”onpage75and“InstallingorreplacingaPCIcard”onpage71.
5.Carefullytakenoteofthelocationsofallcableconnectionsonthesystemboardanddisconnectall
thecables.See“Locatingpartsonthesystemboard”onpage65.
6.Removetheheatsinkandfanassemblyfromthefailingsystemboard.See“Replacingtheheatsinkand
fanassembly”onpage79.
7.Removetheeightscrewsthatsecurethesystemboard.
Figure23.Removingtheeightscrewsthatsecurethesystemboard
8.Carefullyslidethesystemboardsothatitcanbereleasedfromthemountingstudsthatsecurethe
systemboardinplace.
9.Liftthesystemboardoutofthechassis.
Chapter8.ReplacingFRUs85
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