Nokia RM-42 Service Manual page 181

RM-42
BB Troubleshooting and Manual Tuning Guide
• 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 (Page 9–22).
If the failure mode is not clear, start with the Keyboard Test in Phoenix.
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