Lenovo ThinkCentre Edge 91 - Page 141

8.Removetheeightscrewsthatsecurethesystemboard.
Figure71.Removingtheeightscrewsthatsecurethesystemboard
9.Liftthesystemboardoutofthechassis.
10.Removethemicroprocessorfromthefailingsystemboardandinstallitonthenewsystemboard.See
“Replacingthemicroprocessor”onpage133.
11.Installthenewsystemboardintothechassisbyaligningtheeightmountingstudsinthechassiswiththe
correspondingholesinthenewsystemboard.Then,installtheeightscrewstosecurethesystemboard.
12.Installtheheatsinkandfanassemblyandconnecttheheatsinkandfanassemblycabletothenew
systemboard.See“Replacingtheheatsinkandfanassembly”onpage130.
13.InstallallmemorymodulesandPCIcardsremovedfromthefailingsystemboardonthenewsystem
board.See“Installingorreplacingamemorymodule”onpage118and“InstallingorreplacingaPCI
card”onpage116
.
14.Reconnectallremainingcablestothesystemboard.See“Locatingpartsonthesystemboard”on
page109
.
15.Lowertheopticaldrivebayassembly.
16.Tocompletethereplacement,goto“Completingthepartsreplacement”onpage141.
Thefailingsystemboardmustbereturnedwithamicroprocessorsocketcovertoprotectthepinsduring
shippingandhandling.
Toinstallthemicroprocessorsocketcover,dothefollowing:
1.Releasetheleversecuringthemicroprocessorretainerandopentheretainertoaccessthe
microprocessor.
Chapter9.ReplacingFRUs(MachineTypes:1857,1893,and1895)137