User 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, 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.

If the failure mode is not clear, start with the Keyboard Test in Phoenix.

RM-437; RM-449; RM-450

BB Troubleshooting

Page 3 –14 COMPANY CONFIDENTIAL Issue 1