Lenovo 300 - Replacing the Speaker System

Step9.Removethescrewsthatsecuretheheat-sinktothemotherboardandchassis.
Step10.Slidethenliftuptheheat-sinktoremoveit.
Attention:Placetheheat-sinkupsidedownonaflatsurfacetopreventthermalgreasefromcontaminating
othercomponents.
Attention:UseanalcoholpadtowipethethermalgreaseofftheCPU.
Step11.Toinstallthenewheat-sink:
a.Lineupthenewheat-sinkwithmountingholesonthemotherboard,thenplaceitintoposition.
b.Followthenumbersprintedonthenewheat-sinktosecureitinorderusingthescrews.
c.Usethesealingtapetosealthegapin-betweenthesystemfanandheat-sink.
Step12.ReattachtheEMIcover,rearcover,hinge,footcoverandstandbase.
Replacingthespeakersystem
Note:Turnoffthecomputerandwait3to5minutestoletitcooldownbeforeremovingthecover.
Note:Itmaybehelpfultoplacethecomputerface-downonasoftflatsurfaceforthisprocedure.Lenovo
recommendsthatyouuseablanket,towel,orothersoftclothtoprotectthecomputerscreenfromscratches
orotherdamage.
Toreplacethespeakersystem:
Step1.Removeanymedia(disks,CDs,DVDs,ormemorycards)fromthedrives,shutdowntheoperating
system,andturnoffthecomputerandallattacheddevices.
Step2.Unplugallpowercordsfromelectricaloutlets.
Chapter8.Replacinghardware43