ThinkPad T420s - Checkout guide; System diagnostics programs

Note:Duringthewarrantyperiod,thecustomermayberesponsibleforrepaircostsifthecomputerdamage
wascausedbymisuse,accident,modification,unsuitablephysicaloroperatingenvironment,orimproper
maintenancebythecustomer.Followingisalistofsomecommonitemsthatarenotcoveredunderwarranty
andsomesymptomsthatmightindicatethatthesystemwassubjectedtostressbeyondnormaluse.
Beforecheckingproblemswiththecomputer,determinewhetherthedamageiscoveredunderthewarranty
byreferringtothefollowinglist:
Thefollowingarenotcoveredunderwarranty:
•LCDpanelcrackedfromtheapplicationofexcessiveforceorfrombeingdropped
•Scratched(cosmetic)parts
•Distortion,deformation,ordiscolorationofthecosmeticparts
•Plasticparts,latches,pins,orconnectorsthathavebeencrackedorbrokenbyexcessiveforce
•Damagecausedbyliquidspilledintothesystem
•DamagecausedbytheimproperinsertionofaPCCardortheinstallationofanincompatiblecard
•Improperdiscinsertionoruseofanopticaldrive
•Diskettedrivedamagecausedbypressureonthediskettedrivecover,foreignmaterialinthedrive,
ortheinsertionofadiskettewithmultiplelabels
•Damagedorbentdisketteejectbutton
•Fusesblownbyattachmentofanonsupporteddevice
•Forgottencomputerpassword(makingthecomputerunusable)
•Stickykeyscausedbyspillingaliquidontothekeyboard
•Useofanincorrectacpoweradapteronlaptopproducts
Thefollowingsymptomsmightindicatedamagecausedbynonwarrantedactivities:
•Missingpartsmightbeasymptomofunauthorizedserviceormodification.
•Ifthespindleofaharddiskdrivebecomesnoisy,itmayhavebeensubjectedtoexcessiveforce,
ordropped.
Checkoutguide
UsethefollowingproceduresasaguideinidentifyingandcorrectingproblemswiththeThinkPadnotebook
computers.
1.Identifythefailingsymptomsinasmuchdetailaspossible.
2.Verifythesymptoms.Trytore-createthefailurebyrunningthediagnostictestorbyrepeatingthe
operation.
SystemsupportingtheLenovoThinkVantageT oolboxprogramandthe
PC-DoctorforDOSdiagnosticsprogram
ThesectionprovidesinformationaboutThinkPadcomputersthatsupporttheLenovoThinkVantageToolbox
programandthePC-Doctor
®
forDOSdiagnosticsprogram.Somedescriptionsmightnotapplytoyour
particularcomputer.
DiagnosticsusingPC-DoctorforDOS
TheThinkPadNotebookhasatestprogramcalledPC-DoctorforDOS(hereaftercalledPC-Doctor.)Youcan
detecterrorsbyrunningthediagnosticstestincludedinPC-Doctor.
36HardwareMaintenanceManual