Lenovo THINKCENTRE 2491 Bedienungsanleitung Seite 88

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4.Followthissequencetoremovethefourscrewsthatsecuretheheatsinktothesystemboard:
a.Partiallyremovescrew1,thenfullyremovescrew2,andthenfullyremovescrew1.
b.Partiallyremovescrew3,thenfullyremovescrew4,andthenfullyremovescrew3.
Note:Carefullyremovethefourscrewsfromthesystemboardtoavoidanypossibledamagetothe
systemboard.Thefourscrewscannotberemovedfromtheheatsink.
Figure18.Removingtheheatsink
5.Carefullylifttheheatsinkoffthesystemboard.
Notes:
a.Youmighthavetogentlytwisttheheatsinktofreeitfromthemicroprocessor.
b.Donottouchthethermalgreasewhilehandlingtheheatsink.
6.Positionthenewheatsinkonthesystemboardsothatthefourscrewsarealignedwiththeholes
onthesystemboard.
7.Followthissequencetoinstallthefourscrewstosecurethenewheatsink,asshowninFigure18
“Removingtheheatsink”onpage82:
a.Partiallytightenscrew1,thenfullytightenscrew2,andthenfullytightenscrew1.
b.Partiallytightenscrew3,thenfullytightenscrew4,andthenfullytightenscrew3.
8.Goto“Completingthepartsreplacement”onpage98.
Replacingthemicroprocessor
Attention:
Donotopenyourcomputerorattemptanyrepairbeforereadingandunderstandingthe“Importantsafetyinformation”
intheThinkCentreUserGuide.ToobtainacopyoftheThinkCentreUserGuide,goto:
http://www.lenovo.com/ThinkCentreUserGuides
82ThinkCentreHardwareMaintenanceManual
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