Personal Computer User's Guide

Toreplacetheheatsink,dothefollowing:
1.Removeallmediafromthedrivesandturnoffallattacheddevicesandthecomputer.Then,disconnect
allpowercordsfromelectricaloutletsanddisconnectallcablesthatareconnectedtothecomputer.
2.Placeasoft,cleantowelorclothonthedeskorsurface.Holdthesidesofyourcomputerandgentlylay
itdownsothatthescreenisagainstthesurfaceandthecoverisfacingup.
3.Removethecomputercover.See“Removingthecomputercover”onpage41.
4.Locatetheheatsink.See“Locatingcomponents”onpage13.
5.Followthissequencetoremovethefourscrewsthatsecuretheheatsinktothesystemboard:
a.Partiallyremovescrew1,thenfullyremovescrew2,andthenfullyremovescrew1.
b.Partiallyremovescrew3,thenfullyremovescrew4,andthenfullyremovescrew3.
Note:Carefullyremovethefourscrewsfromthesystemboardtoavoidanypossibledamagetothe
systemboard.Thefourscrewscannotberemovedfromtheheatsink.
Figure29.Removingtheheatsink
6.Removethefailingheatsinkoffthesystemboard.
Notes:
a.Youmighthavetogentlytwisttheheatsinktofreeitfromthemicroprocessor.
b.Donottouchthethermalgreasewhilehandlingtheheatsink.
7.Positionthenewheatsinkonthesystemboardsothatthefourscrewsarealignedwiththe
correspondingholesinthesystemboard.
8.Followthissequencetoinstallthefourscrewstosecuretheheatsink,asshowninFigure29“Removing
theheatsink”onpage52.
a.Partiallytightenscrew1,thenfullytightenscrew2,andthenfullytightenscrew1.
b.Partiallytightenscrew3,thenfullytightenscrew4,andthenfullytightenscrew3.
52ThinkCentreUserGuide