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ThinkPad T420 - About this Manual

ThinkPad T420
186 pages
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Aboutthismanual
ThismanualcontainsserviceandreferenceinformationforthefollowingThinkPad
®
products.
ThinkPadT420andT420iMachineType4177,4178,4179,4180,4236,4237,and4238
Usethismanualalongwiththeadvanceddiagnosticteststotroubleshootproblems.
Important:
ThismanualisintendedonlyfortrainedservicetechnicianswhoarefamiliarwithThinkPadproducts.Usethis
manualalongwiththeadvanceddiagnosticteststotroubleshootproblemseffectively.
BeforeservicingaThinkPadproduct,besuretoreadalltheinformationunderChapter1“Safetyinformation”on
page1andChapter2“Importantserviceinformation”onpage23.
©CopyrightLenovo2012
iii
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