Hardware Maintenance

Table Of Contents

Generalcheckout

Thischapterpresentsthefollowinginformation:

• “Whattodofirst”onpage 20

• “Powersystemcheckout”onpage 21

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

General checkout

Important notes:

• Only certified trained personnel can service the computer.

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

replacing FRUs.

• When you replace FRUs, use new nylon-coated screws.

• 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.