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Keypad troubleshooting

There are two possible failure modes in the keyboard module:
• One or more keys are stuck, so that the key does not react when a keydome is pressed. This kind of failure
is caused by mechanical reasons (dirt, rust, mechanical damage, etc.)
• Malfunction of several keys at the same time; this happens when one or more rows or columns in the key
matrix are failing (shortcut or open connection).
If the failure mode is not clear, start with the Keyboard test in TOOL BOX
Replace keypad ic{Z2401,Z2402}