Keyboard Troubleshooting - Nokia RM-484 Service Manual

RM-484; RM-485; RM-486
BB Troubleshooting

Keyboard troubleshooting

Context
There are two possible failure modes in the keyboard module:
1 One or more keys are stuck, so that the key(s) does not react when you press a keydome. This kind of
failure is caused by mechanical reasons (dirt, corrosion).
2 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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