Lenovo M90 User's Guide download pdf (Page 27)

Note:Carefullyremovethefourscrewsfromthesystemboardtoavoidanypossibledamagetothe

systemboard.Thefourscrewscannotberemovedfromtheheatsink.

Figure16.Removingtheheatsink

5.Carefullylifttheheatsinkoffthesystemboard.

Notes:

a.Youmighthavetogentlytwisttheheatsinktofreeitfromthemicroprocessor.

b.Donottouchthethermalgreasewhilehandlingtheheatsink.

6.Positionthenewheatsinkonthesystemboardsothatthefourscrewsarealignedwiththeholes

onthesystemboard.

7.Alternatetighteningeachscrewasmallandequalamountuntiltheheatsinkissecuredtothesystem

board.Donotover-tightenthescrews.

Whattodonext:

•Toworkwithanotherpieceofhardware,gototheappropriatesection.

•Tocompletetheinstallationorreplacement,goto“Completingthepartsreplacement”onpage25

Replacingtheinternalspeaker

Attention:

Donotopenyourcomputerorattemptanyrepairbeforereadingandunderstandingthe“Importantsafetyinformation”

intheThinkCentreSafetyandWarrantyGuidethatcamewithyourcomputer.ToobtainacopyoftheThinkCentre

SafetyandWarrantyGuide,goto:

http://www.lenovo.com/support

Thissectionprovidesinstructionsonhowtoreplacetheinternalspeaker.

Toreplacetheinternalspeaker,dothefollowing:

1.Removeallmediafromthedrivesandturnoffallattacheddevicesandthecomputer.Then,disconnect

allpowercordsfromelectricaloutletsanddisconnectallcablesthatareconnectedtothecomputer.

2.Openthecomputercover.See“Openingthecomputercover”onpage12.

Chapter2.Installingorreplacinghardware19

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Lenovo M90 User's Guide Page 27