Lenovo THINKCENTRE 2491 Bedienungsanleitung Seite 92

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16.Reconnectallcablesthatweredisconnectedfromthesystemboard.
17.Goto“Completingthepartsreplacement”onpage98.
Replacingthesystemboard
Attention:
Donotopenyourcomputerorattemptanyrepairbeforereadingandunderstandingthe“Importantsafetyinformation”
intheThinkCentreUserGuide.ToobtainacopyoftheThinkCentreUserGuide,goto:
http://www.lenovo.com/ThinkCentreUserGuides
Thissectionprovidesinstructionsonhowtoreplacethesystemboard.
CAUTION:
Theheatsinkandmicroprocessormightbeveryhot.Turnoffthecomputerandwait
threetoveminutestoletthecomputercoolbeforeopeningthecomputercover.
Toreplacethesystemboard,dothefollowing:
1.Removeallmediafromthedrivesandturnoffallattacheddevicesandthecomputer.Then,disconnect
allpowercordsfromelectricaloutletsanddisconnectallcablesthatareconnectedtothecomputer.
2.Openthecomputercover.See“Openingthecomputercoveronpage72.
3.Takenotesofthelocationofallthecableconnectorsonthesystemboardandthendisconnectallthe
cables.See“Locatingpartsonthesystemboard”onpage71.
4.Removetheheatsinkfromthesystemboard.See“Replacingtheheatsink”onpage81.
5.Removethememorymodulesfromthefailingsystemboard.See“Installingorreplacingamemory
module”onpage74
.
6.RemovethePCIcardfromthefailingsystemboard.See“InstallingorreplacingthePCIcard”on
page75.
7.Removethebatteryfromthefailingsystemboard.See“Replacingthebattery”onpage80.
8.Removethemicroprocessorfromthefailingsystemboard.See“Replacingthemicroprocessoron
page82
.
9.Removethefourscrewsthatsecurethefailingsystemboardtotheprotectivecover.
86ThinkCentreHardwareMaintenanceManual
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