ThinkPad T420s - Strategy for replacing a hard disk drive; Important notice for replacing a system board; How to use error message

Attention:Thesetupconfigurationonthecomputeryouareservicingmayhavebeencustomized.Running
AutomaticConfigurationmayalterthesettings.Notethecurrentconfigurationsettings(usingtheView
Configurationoption);then,whenservicehasbeencompleted,verifythatthosesettingsremainineffect.
Strategyforreplacingaharddiskdrive
Alwaystrytorunalow-levelformatbeforereplacingaharddiskdrive.Thiswillcauseallcustomerdataon
theharddisktobelost.Besurethatthecustomerhasacurrentbackupofthedatabeforedoingthistask.
Attention:Thedrivestartupsequenceinthecomputeryouareservicingmayhavebeenchanged.Be
extremelycarefulduringwriteoperationssuchascopying,saving,orformatting.Ifyouselectanincorrect
drive,dataorprogramscanbeoverwritten.
IfyourcomputerisshippedwithanmSATAdriveandasolid-statedriveorharddiskdrive,themSATAdrive
willbeseenasharddisk0inthesystem,andassigneddriveC:.Thesolid-statedriveorharddiskdrivewill
beseenasharddisk1,andassigneddriveD:.ThemSATAdriveisinstalledinthewirelessWANcardslotof
thecomputer.TheLenovopreloadedsoftwareisinstalledonthemSATAdrive.
Importantnoticeforreplacingasystemboard
Somecomponentsmountedonasystemboardareverysensitive.Improperhandlingofasystemboardcan
causedamagetothosecomponents,andmaycauseasystemmalfunction.
Attention:Whenhandlingasystemboard:
•Donotdropasystemboardorapplyanyexcessiveforcetoit.
•Avoidroughhandlingofanykind.
•AvoidbendingasystemboardandhardpushingtopreventcrackingateachBGA(BallGridArray)chipset.
Howtouseerrormessage
Usetheerrorcodesdisplayedonthescreentodiagnosefailures.Ifmorethanoneerrorcodeisdisplayed,
beginthediagnosiswiththefirsterrorcode.Whatevercausesthefirsterrorcodemayalsocausefalseerror
codes.Ifnoerrorcodeisdisplayed,seewhethertheerrorsymptomislistedintheSymptom-to-FRU
Indexforthecomputeryouareservicing.
StrategyforreplacingFRUsforCTO,CMV,andGAV
Productdefinition
DynamicConfigureToOrder(CTO)
ThisprovidestheabilityforacustomertoconfigureaLenovosolutionfromaneSite,andhavethis
configurationsenttofulfillment,whereitisbuiltandshippeddirectlytothecustomer.Themachinelabel,
ProductEntitlementWarehouse(PEW),eSupport,andtheHMMwillloadtheseproductsasthe4-digitMT
and3-digitmodel,wheremodel=“CTO”(Example:1829-CTO).
CustomModelVariant(CMV)
ThisisauniqueconfigurationthathasbeennegotiatedbetweenLenovoandthecustomer.Aunique4-digit
MTand3-digitmodelisprovidedtothecustomertoplaceorders(Example:1829-W15).ACMVisaspecial
bidoffering.Therefore,itisNOTgenerallyannounced.
32HardwareMaintenanceManual