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General checkout

This chapter presents the following information:

• “What to do rst” on page 20

• “Power system checkout” on page 21

Before you go to the checkout, make sure to read the following important notes:

Important notes:

• Onlycertiedtrainedpersonnelcanservicethecomputer.

• BeforereplacinganyFRU, readthe entirepageonremovingandreplacing

FRUs.

• CarefullyremovescrewsforreusewhenreplacingFRUs.

• Beextremely carefulduring such write operationsas copying, saving, or

formatting.Drivesinthe computer thatyouareservicingsequence might

havebeenaltered.Ifyouselectanincorrectdrive,dataorprogramsmightbe

overwritten.

• Replace an FRU onlywith another FRU of the correct model.Whenyou

replaceanFRU,makesurethatthemachinemodelandtheFRUpartnumberare

correctbyreferringtotheFRUpartslist.

• An FRU shouldnotbe replacedjust because of a single, unreproducible

failure.Singlefailurescanoccurforavarietyofreasonsthathavenothingto

dowithahardwaredefect,suchascosmicradiation,electrostaticdischarge,or

softwareerrors.ConsiderreplacinganFRUonlywhenaproblemrecurs.Ifyou

suspectthatanFRUisdefective,cleartheerrorlogsandrunthetestagain.Ifthe

errordoesnotrecur,donotreplacetheFRU.

• BecarefulnottoreplaceanondefectiveFRU.

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