User Manual

7.Liftthefailingheatsinkandfanassemblyoffthesystemboard.

Notes:

•Youmighthavetogentlytwisttheheatsinkandfanassemblytofreeitfromthemicroprocessor.

•Donottouchthethermalgreasewhilehandlingtheheatsinkandfanassembly.

8.Positionthenewheatsinkandfanassemblyonthesystemboardsothatthefourscrewsarealigned

withtheholesinthesystemboard.Ensurethattheheatsinkandfanassemblycablefacestowardthe

microprocessorfanconnectoronthesystemboard.

9.Followthefollowingsequencetoinstallthefourscrewstosecurethenewheatsinkandfanassembly.

Donotover-tightenthescrews.

a.Partiallytightenscrew1,thenfullytightenscrew2,andthenfullytightenscrew1.

b.Partiallytightenscrew3,thenfullytightenscrew4,andthenfullytightenscrew3.

10.Connectthecableofthenewheatsinkandfanassemblytothemicroprocessorfanconnectoronthe

systemboard.See“Partsonthesystemboard”onpage6.

11.Positiontheheatsinkfanductonthetopofthenewheatsinkandfanassemblyasshown.Then,press

theheatsinkfanductstraightdownuntilitsnapsintoposition.

Figure54.Installingtheheatsinkfanduct

Whattodonext:

•Toworkwithanotherpieceofhardware,gototheappropriatesection.

•Tocompletetheinstallationorreplacement,goto“Completingthepartsreplacement”onpage81.

Replacingthecoin-cellbattery

Attention:Donotopenyourcomputerorattemptanyrepairbeforereadingandunderstandingthe“Read

thisﬁrst:Importantsafetyinformation”onpageiii.

Yourcomputerhasaspecialtypeofmemorythatmaintainsthedate,time,andsettingsforbuilt-infeatures,

suchasparallel-connectorassignments(conﬁguration).Acoin-cellbatterykeepsthisinformationactive

whenyouturnoffthecomputer.

Thecoin-cellbatterynormallyrequiresnochargingormaintenancethroughoutitslife;however,nocoin-cell

batterylastsforever.Ifthecoin-cellbatteryfails,thedate,time,andconﬁgurationinformation(including

passwords)arelost.Anerrormessageisdisplayedwhenyouturnonthecomputer.

76ThinkCentreM800andM900UserGuide