8.Alternatetighteningeachscrewasmallandequalamountuntiltheheatsinkandfanassemblyis
securedtothesystemboard.Donotover-tightenthescrews.
9.Connectthenewheatsinkandfanassemblycabletothemicroprocessorfanconnectoronthesystem
board.
10.Goto“CompletingtheFRUreplacement”onpage97.
Replacingthemicroprocessor
Attention
Donotopenyourcomputerorattemptanyrepairbeforereadingandunderstandingthe“Importantsafetyinformation”
intheThinkCentreSafetyandWarrantyGuidethatcamewithyourcomputer.ToobtainacopyoftheThinkCentre
SafetyandWarrantyGuide,goto:
http://www.lenovo.com/support
Thissectionprovidesinstructionsonhowtoreplacethemicroprocessor.
CAUTION:
Theheatsinkandmicroprocessormightbeveryhot.T urnoffthecomputerandwait
threetoveminutestoletthecomputercoolbeforeremovingthecomputercover.
Toreplacethemicroprocessor ,dothefollowing:
1.Removethecomputercover.See“Removingthecomputercover”onpage68.
2.Laythecomputeronitssideforeasieraccesstothesystemboard.
3.Notethelocationsofallpartsandconnectorsonthesystemboard.See“Locatingpartsonthe
systemboard”onpage70.
4.Removeanypartsorcablesthatmightpreventyouraccesstothesystemboar d.
5.Removetheheatsinkandfanassembly.See“Replacingtheheatsinkandfanassembly”onpage78.
6.Placetheheatsinkandfanassemblyonitssidesothatthethermalgreasedoesnotcomeincontact
withanything.
7.Liftthesmallhandle1toreleasethemicr oprocessor2securedonthesystemboard.
80ThinkCentreHardwareMaintenanceManual