Toshiba PROL550 manual Procedure1 Externalkeyboardcheck, Iftheproblemstillexists,performCheck3

2￿Troubleshooting￿Procedures￿

To￿determine￿if￿the￿computer’s￿keyboard￿is￿functioning￿properly,￿perform￿the￿following￿ procedures.￿Figure￿2-5￿outlines￿the￿process.￿Start￿with￿Procedure￿1￿and￿continue￿with￿the￿other￿procedures￿as￿instructed.￿

Procedure￿1:￿ External￿keyboard￿check￿

Procedure￿2:￿ Diagnostic￿check￿

Procedure￿3:￿ Connector￿and￿replacement￿check￿

Procedure￿1￿ External￿keyboard￿check￿

Connect￿a￿USB￿keyboard￿to￿one￿of￿the￿computer’s￿USB￿ports,￿and￿then￿boot￿the￿computer.￿ The￿computer￿automatically￿detects￿the￿external￿keyboard.￿

If￿the￿external￿keyboard￿works￿correctly,￿the￿internal￿keyboard￿or￿its￿connections￿may￿be￿ faulty.￿￿Go￿to￿Procedure￿2.￿

If￿the￿external￿keyboard￿appears￿to￿have￿the￿same￿problem￿as￿the￿internal￿keyboard,￿the￿ system￿board￿may￿be￿having￿some￿problem.￿￿Replace￿it￿with￿a￿new￿one￿and￿following￿the￿ instructions￿in￿Chapter￿4.￿

Procedure￿2￿ Diagnostic￿check￿

Run￿the￿test￿and￿Diagnostics￿Program,￿which￿will￿automatically￿execute￿the￿Keyboard￿Test.￿￿ Refer￿to￿Chapter￿3,￿Tests￿and￿Diagnostics￿for￿more￿information￿on￿how￿to￿run￿the￿program.￿

If￿an￿error￿is￿located,￿go￿to￿Procedure￿3.￿￿If￿an￿error￿does￿not￿occur,￿the￿keyboard￿is￿ functioning￿ok.￿

Procedure￿3￿ Connector￿and￿replacement￿check￿

The￿keyboard￿and/or￿system￿board￿may￿be￿disconnected￿or￿damaged.￿￿Disassemble￿the￿ computer￿following￿the￿steps￿described￿in￿Chapter￿4,￿Replacement￿Procedures￿and￿perform￿ the￿following￿checks.￿

Check￿1￿ Make￿sure￿the￿keyboard￿cable￿is￿firmly￿connected￿to￿the￿system￿board.￿￿

If￿the￿connection￿is￿loose,￿reconnect￿firmly￿and￿repeat￿Procedure￿2.￿If￿there￿is￿still￿ an￿error,￿go￿to￿Check￿2.￿

Check￿2￿ The￿keyboard￿may￿be￿damaged.￿Replace￿it￿with￿a￿new￿one￿following￿the￿ instructions￿in￿Chapter￿4.￿

If￿the￿problem￿still￿exists,￿perform￿Check￿3.￿

Check￿3￿ The￿system￿board￿may￿be￿damaged.￿￿Replace￿it￿with￿a￿new￿one￿following￿the￿ instructions￿in￿Chapter￿4.￿

￿￿￿￿￿￿￿￿￿

SATELLITE￿L550/PROL550￿SERIES￿MAINTENANCE￿MANUAL￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿18￿