Lenovo THINKCENTRE 2491 User Manual Page 89

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Thissectionprovidesinstructionsonhowtoreplacethemicroprocessor.
CAUTION:
Theheatsinkandmicroprocessormightbeveryhot.Turnoffthecomputerandwaitthreetove
minutestoletthecomputercoolbeforeremovingthecomputercover.
Toreplacethemicroprocessor,dothefollowing:
1.Removeallmediafromthedrivesandturnoffallattacheddevicesandthecomputer.Then,disconnect
allpowercordsfromelectricaloutletsanddisconnectallcablesthatareconnectedtothecomputer.
2.Openthecomputercover.See“Openingthecomputercoveronpage72.
3.Locatethesystemboardanddisconnectallcablesconnectedtothesystemboard.See“Locating
partsonthesystemboard”onpage71.
4.Pressinwardonthetwosidetabsandthenpivotthesystemboardtoreleaseitfromthechassis.
Figure19.Releasingthesystemboard
5.Placethesystemboardonacleanandatsurface.
6.Removetheheatsink.See“Replacingtheheatsink”onpage81.
Note:Placetheheatsinkonitssidesothatthethermalgreaseonthebottomofitdoesnotgetin
contactwithanything.
Chapter8.ReplacingFRUs83
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