Key alarm

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The Key alarm indicates an issue with the display terminal's keypad. This fault is triggered if a key remains pressed for longer than 10 seconds, if the membrane switch is disconnected, or if the display terminal powers on while a key is already depressed.

• A key on the display terminal is stuck in the pressed position for an extended period (over 10 seconds).
• The membrane switch of the display terminal is disconnected or has failed internally.
• The display terminal was woken up or powered on with one or more keys already pressed.

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1. 1

   Inspect the display terminal keypad for any physically stuck keys and gently clean around them to ensure free movement.

2. 2

   Check the connection of the membrane switch to the display terminal's PCB, ensuring it is properly seated.

3. 3

   Ensure no keys are pressed when the display terminal is powered on or woken up.

4. 4

   If the fault persists after checking the keypad, consider replacing the display terminal as the membrane switch or internal components may be faulty.