Lenovo ThinkCentre M91 - Replacing the Ac Power Adapter

7.CompletelyremovethefrontaudioandUSBassemblybracketfromthechassis.
8.RemovethetwoscrewsthatsecurethefrontaudioandUSBassemblytoitsbracketandremovethe
failingfrontaudioandUSBassemblyfromthebracket.
9.InstallanewfrontaudioandUSBassemblyintothebracketandinstallthetwoscrewstosecurethe
frontaudioandUSBassemblytothebracket.
10.InstallthefrontaudioandUSBassemblybracketintothechassisandalignthescrewholeinthe
bracketwiththecorrespondingholeinthechassis.
Figure31.InstallingthefrontaudioandUSBassembly
11.InstallthescrewtosecurethefrontaudioandUSBassemblybrackettothechassis.
12.Installthenewpowerswitchassemblyintothechassis.
13.ConnectthefrontUSB,frontpanel,andfrontaudiocablestothesystemboard.See“Locatingpartson
thesystemboard”onpage71
.
14.Reinstallthefrontbezel.See“Removingandreinstallingthefrontbezel”onpage73.
15.Goto“Completingthepartsreplacement”onpage98.
Replacingtheacpoweradapter
Attention:
Donotopenyourcomputerorattemptanyrepairbeforereadingandunderstandingthe“Importantsafetyinformation”
intheThinkCentreUserGuide.ToobtainacopyoftheThinkCentreUserGuide,goto:
http://www.lenovo.com/ThinkCentreUserGuides
Thissectionprovidesinstructionsonhowtoreplacetheacpoweradapter.
94ThinkCentreHardwareMaintenanceManual