Personal Computer User Manual
8.Installthenewpowersupplyintothechassissothatthescrewholesinthepowersupplyalignwith
thoseinthechassis.
Note:UseonlythescrewsprovidedbyLenovo.
9.Installandtightenthefourscrewsattherearofthechassistosecurethepowersupply.
10.Checkthepositionofthevoltage-selectionswitchontherearofthecomputer.Useaballpointpento
slidetheswitch,ifnecessary.
Note:Somecomputersdonothaveavoltage-selectionswitch.Thesecomputersautomaticallycontrol
thevoltage.
•Ifthevoltagesupplyrangeis100–127VAC,settheswitchto115V.
•Ifthevoltagesupplyrangeis200–240VAC,settheswitchto230V.
11.Reconnectallthepowersupplycablestothedrivesandthesystemboard.
12.Goto“CompletingtheFRUreplacement”onpage131.
Replacingtheheatsinkandfanassembly
Attention
Donotopenyourcomputerorattemptanyrepairbeforereadingandunderstandingthe“Importantsafetyinformation”
intheThinkCentreSafetyandWarrantyGuidethatcamewithyourcomputer.ToobtainacopyoftheThinkCentre
SafetyandWarrantyGuide,goto:
http://www.lenovo.com/support
Thissectionprovidesinstructionsonhowtoreplacetheheatsinkandfanassembly.
CAUTION:
Theheatsinkandfanassemblymightbeveryhot.Turnoffthecomputerandwaitthree
toveminutestoletthecomputercoolbeforeopeningthecomputercover.
Toreplacetheheatsinkandfanassembly:
1.Openthecomputercover.See“Openingthecomputercover”onpage107.
2.Pivotthedrivebayassemblyupwardtogainaccesstotheheatsinkandfanassembly.See“Accessing
thesystemboardcomponentsanddrives”onpage108.
3.Disconnecttheheatsinkandfanassemblycablefromthesystemboard.See“Locatingpartsonthe
systemboard”onpage110.
4.Removetheheatsinkandfanassemblyfromthesystemboardbypivotingthelever1securingthe
heatsinkandfanassemblyuntilitisfullyintheupposition.Carefullylifttheheatsinkandfanassembly
offthesystemboard.
Note:Ithelpstoremovetheharddiskdrivebeforethisstep.See“Replacingtheharddiskdrive”on
page122.
Chapter9.ReplacingFRUs(MachineTypes:3379,4083,4088,4099,4138,5897,6137,6234,6258,6303,7174,7220,
7346,7354,7357,7360,7483,7582,7627,7630,7638,8910,and9964.)117