Keyboard Troubleshooting - Nokia n80 User Manual

RM-91; RM-92
BB Troubleshooting and Manual Tuning Guide

Keyboard troubleshooting

Context
There are two possible failure modes in the keyboard module:
• One or more keys can be stuck, so that the key does not react when a keydome is pressed. This kind of
failure is caused by mechanical reasons (dirt, corrosion).
• Malfunction of several keys at the same time; this happens when one or more rows or columns are failing
(shortcut or open connection). For a more detailed description of the keyboard and keymatrix, see
section Keyboard.
If the failure mode is not clear, start with the Keyboard Test in
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