Lenovo ThinkCentre Edge 72z - Page 111

Safety,Warranty,andSetupGuide,goto:
http://www.lenovo.com/support
Thissectionprovidesinstructionsonhowtoreplacetheheatsinkassembly.
CAUTION:
Theheatsinkandfanassemblymightbeveryhot.Turnoffthecomputerandwaitthreetove
minutestoletthecomputercoolbeforeremovingthecomputercover.
Toreplacetheheatsinkassembly,dothefollowing:
1.Removeallmediafromthedrivesandturnoffallattacheddevicesandthecomputer.Then,disconnect
allpowercordsfromelectricaloutletsanddisconnectallcablesthatareconnectedtothecomputer.
2.Placeasoft,cleantowelorclothonthedeskorotheratsurface.Holdthesidesofyourcomputerand
gentlylayitdownsothatthescreenisagainstthesurfaceandthecoverisfacingup.
3.Removethecomputercover.See“Removingthecomputercover”onpage94.
4.Locatetheheatsinkassemblyonthesystemboard.See“LocatingmajorFRUsandCRUs”onpage82.
5.Removethesystemboardshield.See“Removingandreinstallingthesystemboardshield”onpage101.
6.Followthesequence1,2,3,4ontheheatsinkassemblytoloosethefourscrewsthatsecurethe
heatsinkassemblytothesystemboard.
Note:Carefullyloosethefourscrewsfromthesystemboardtoavoidanypossibledamagetothe
systemboard.Thefourscrewscannotberemovedfromtheheatsinkassembly.
Figure27.Loosingthefourscrewsthatsecuretheheatsinkassemblytothesystemboard
7.Liftthefailingheatsinkassemblyoffthesystemboard.
Notes:
a.Youmighthavetogentlytwisttheheatsinkassemblytofreeitfromthemicroprocessor.
b.Donottouchthethermalgreasewhilehandlingtheheatsinkassembly.
8.Toreinstalltheheatsinkassembly,positionthenewheatsinkassemblyonthesystemboardsothatthe
fourscrewsarealignedwiththecorrespondingholesinthesystemboard.
Chapter9.ReplacingFRUs105