•Takeadditionalcarewhenhandlingdevicesduringcoldweather.Heatingreducesindoorhumidity
andincreasesstaticelectricity.
Workinginsidetheserverwiththepoweron
Attention:
Staticelectricitythatisreleasedtointernalservercomponentswhentheserveristurnedonmightcausetheserverto
halt,whichmightresultinthelossofdata.Toavoidthispotentialproblem,alwaysuseanelectrostatic-dischargewrist
straporothergroundingsystemwhenyouworkinsidetheserverwiththepoweron.
Theserversupportshot-swapdevicesandisdesignedtooperatesafelywhileitisturnedonandthecoveris
removed.Followtheseguidelineswhenyouworkinsidetheserverwiththepoweron:
•Avoidwearingloose-ttingclothingonyourforearms.Buttonlong-sleevedshirtsbeforeworkinginside
theserver;donotwearcufflinkswhileyouareworkinginsidetheserver.
•Donotallowyournecktieorscarftohanginsidetheserver.
•Removejewelry,suchasbracelets,necklaces,rings,andloose-ttingwristwatches.
•Removeitemsfromyourshirtpocket,suchaspensandpencils.Theseitemsmightfallintotheserveras
youleanoverit.
•Avoiddroppinganymetallicobjectsintotheserver,suchaspaperclips,hairpins,andscrews.
Guidelinesfortrainedservicetechnicians
Thissectioncontainsinformationfortrainedservicetechnicians.
Inspectingforunsafeconditions
UsetheinformationinthissectiontohelpyouidentifypotentialunsafeconditionsinaLenovoproductthat
youareworkingon.EachLenovoproduct,asitwasdesignedandmanufactured,hasrequiredsafetyitems
toprotectusersandservicetechniciansfrominjury.Theinformationinthissectionaddressesonlythose
items.Usegoodjudgmenttoidentifypotentialunsafeconditionsthatmightbecausedbynon-Lenovo
alterationsorattachmentofnon-Lenovofeaturesoroptionsthatarenotaddressedinthissection.Ifyou
identifyanunsafecondition,youmustdeterminehowseriousthehazardisandwhetheryoumustcorrect
theproblembeforeyouworkontheproduct.
Considerthefollowingconditionsandthesafetyhazardsthattheypresent:
•Electricalhazards,especiallyprimarypower.Primaryvoltageontheframecancauseseriousorfatal
electricalshock.
•Explosivehazards,suchasadamagedCRTfaceorabulgingcapacitor.
•Mechanicalhazards,suchaslooseormissinghardware.
Toinspecttheproductforpotentialunsafeconditions,completethefollowingsteps:
1.Makesurethatthepowerisoffandthepowercordisdisconnected.
2.Makesurethattheexteriorcoverisnotdamaged,loose,orbroken,andobserveanysharpedges.
3.Checkthepowercord:
•Makesurethatthethird-wiregroundconnectorisingoodcondition.Useametertomeasure
third-wiregroundcontinuityfor0.1ohmorlessbetweentheexternalgroundpinandtheframeground.
•Makesurethatthepowercordisthecorrecttype.
•Makesurethattheinsulationisnotfrayedorworn.
Chapter5.ReplacingFRUs41
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