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2 Troubleshooting Procedures
NB250/NB255 Series Maintenance Manual
17
2.5 Keyboard Troubleshooting
Perform external keyboard check
(Procedure 1)
START
Does the external
keyboard function ok?
Perform diagnostic check
(Procedure 2)
Was a keyboard
problem detected?
Perform connector and
replacement check
(Procedure 3)
Replace system board
END
Yes
No
Keyboard is not
faulty. Continue
troubleshooting-refer
to Figure 2.1
No
Yes
Figure 2-4 Keyboard troubleshooting process