Lenovo ThinkCentre Edge 91 - Page 103

5.Removethepowersupplyassemblyfromthechassis.See“Replacingthepowersupplyassembly”
onpage92.
6.RemoveallmemorymodulesandPCIcardsthatarecurrentlyinstalled.See“Installingorreplacinga
memorymodule”onpage85and“InstallingorreplacingaPCIcard”onpage82.
7.Carefullytakenoteofthelocationsofallcableconnectionsonthesystemboardanddisconnectall
thecables.See“Locatingpartsonthesystemboard”onpage77.
8.Removetheheatsinkandfanassemblyfromthefailingsystemboard.See“Replacingtheheatsinkand
fanassembly”onpage94.
9.Removetheeightscrewsthatsecurethesystemboard.
Figure28.Removingtheeightscrewsthatsecurethesystemboard
10.Carefullyslidethesystemboardsothatitcanbereleasedfromthemountingstudsthatsecurethe
systemboardinplace.
11.Liftthesystemboardoutofthechassis.
12.Removethemicroprocessorfromthefailingsystemboardandinstallitonthenewsystemboard.
See“Replacingthemicroprocessor”onpage96.
13.Installthenewsystemboardintothechassisbyaligningtheeightmountingstudsinthechassiswiththe
correspondingholesinthenewsystemboard.Carefullyslidethenewsystemboardintothechassisuntil
itissecuredinplacebythemountingstuds.Then,installtheeightscrewstosecurethesystemboard.
14.Installtheheatsinkandfanassemblyandconnecttheheatsinkandfanassemblycabletothenew
systemboard.See“Replacingtheheatsinkandfanassembly”onpage94
.
15.Installtheharddiskdrive.See“Replacingtheprimaryharddiskdrive”onpage88.
16.Installthepowersupplyassembly.See“Replacingthepowersupplyassembly”onpage92.
Chapter8.ReplacingFRUs(MachineTypes:1852,1853,and1855)99