Lenovo Personal Computer 4155 Bedienungsanleitung Seite 130

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Notes:
a.Donotremovetheplasticcoveruntilyouarereadytoinstalltheheatsinkandfanassemblyonthe
microprocessor.Donottouchthegreaseontheheatsinkandfanassembly.Donotputtheheat
sinkandfanassemblyanywhereexceptonthemicroprocessoraftertheplasticcoverhasbeen
removedandthegreaseexposed.
b.Someheatsinkpartnumberswillhaveorientationlabelsshowing"FrontofSystem."HeatSinksthat
donothaveorientationlabelsshouldbeorientedsothefancableistowardtheboardconnector
labeled"CPUFan."
7.Placethenewheatsinkintoposition.
Important:Donottouchthethermalgreasewhilehandlingtheheatsink.
8.Alignthefourscrewsontheheatsinkwiththefourmountingstudsinthechassis.
9.Followthissequencetoinstallthescrews,notingthatfullytightis5in-lbs+/-0.5in-lbs:
a.Partiallytightenscrew1,thenfullytightenscrew2,andfullytightenscrew1.
b.Partiallytightenscrew3,thenfullytightenscrew4,andfullytightenscrew3.
10.Reconnecttheheatsinkfancable.See“Locatingpartsonthesystemboardonpage113.
11.Goto“CompletingtheFRUreplacement”onpage108.
Replacingthemicroprocessor
CAUTION:
Theheatsinkandmicroprocessormightbeveryhot.Turnoffthecomputerandwait
threetoveminutestoletthecomputercoolbeforeopeningthecomputercover.
Attention
Donotopenyourcomputerorattemptanyrepairbeforereadingandunderstandingthe“Importantsafetyinformation”
intheThinkStationSafetyandWarrantyGuidethatcamewithyourcomputer.ToobtainacopyoftheThinkStation
SafetyandWarrantyGuide,goto:
http://www.lenovo.com/support.
Thissectionprovidesinstructionsonhowtoreplacethemicroprocessor.
Toreplacethemicroprocessor:
1.Openthecomputercover.See“Removingthecover”onpage78.
2.Placethecomputeronitssidetohelpmakethesystemboardmoreaccessible.
3.Removetheheatsinkfromthesystemboard.See“Replacingtheheatsink”onpage90.
4.Toremovethemicroprocessor3fromthesystemboard,liftthesmallhandle1andopentheretainer2.
122ThinkStationHardwareMaintenanceManual
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