Keyboard Troubleshooting - Nokia N72 Service Manual

RM-180
BB Troubleshooting and Tuning Guide
Take single trig measurement on the rising edge of the DAT signal.

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 faulty
(shortcut or open connection). For a more detailed description of the keyboard and keymatrix, see
section Keyboard in System Module.
If the failure mode is not clear, start with the Keyboard Test in
Issue 1
Figure 50 Data transfer
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