Keyboard Troubleshooting - Nokia RM-57 Service Manual

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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, rust).
• 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 9–21).
If the failure mode is not clear, start with the Keyboard Test in Phoenix.
Page 6–26
Take singe trig measurement on the rising edge of the DAT signal.
Figure 52 MMC card initialization
Figure 53 Data transfer
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