5.Followthefollowingsequencetoremovethefourscrewsthatsecuretheheatsinkandfanassembly
tothesystemboard:
a.Partiallyremovescrew1,thenfullyremovescrew2,andthenfullyremovescrew1.
b.Partiallyremovescrew3,thenfullyremovescrew4,andthenfullyremovescrew3.
Note:Carefullyremovethefourscrewsfromthesystemboardtoavoidanypossibledamagetothe
systemboard.Thefourscrewscannotberemovedfromtheheatsinkandfanassembly.
Figure39.Removingtheheatsinkandfanassembly
6.Lifttheheatsinkandfanassemblyoffthesystemboard.
Notes:
•Youmighthavetogentlytwisttheheatsinkandfanassemblytofreeitfromthemicroprocessor.
•Whenhandlingtheheatsinkandfanassembly,donottouchthethermalgreaseonthebottom
oftheheatsinkandfanassembly.
7.Placethenewheatsinkandfanassemblyonthesystemboardsothatthefourscrewsarealigned
withthecorrespondingholesinthesystemboard.Makesurethatyouproperlyplacethenewheat
sinkandfanassemblysothatyoucaneasilyconnectthenewheatsinkandfanassemblycabletothe
microprocessorfanconnectoronthesystemboard.
8.Followthefollowingsequencetoinstallthefourscrewstosecurethenewheatsinkandfanassembly.
Donotover-tightenthescrews.
a.Partiallytightenscrew1,thenfullytightenscrew2,andthenfullytightenscrew1.
b.Partiallytightenscrew3,thenfullytightenscrew4,andthenfullytightenscrew3.
9.Connectthenewheatsinkandfanassemblycabletothemicroprocessorfanconnectoronthesystem
board.See“Locatingpartsonthesystemboard”onpage13.
60ThinkCentreM73UserGuide
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