The top cover plate and or the side cover plate of the Light Processor compartment has been removed.

Clear the security warning. See service manual chapter "Authorization to clear security warning on the projector".

Brief procedure to clear the security warning:

1. Ensure the top cover plate of the Light Processor compartment is properly installed.

2. Ensure the side cover plate of the Light Processor compartment is properly installed.

3. Ensure that all modules are properly installed into the Card Cage.

4. Start up the projector.

5. Initiate authorization by pushing the Key button on the Local Keypad.

6. Enter the pin code within 5 seconds.

Defect security switches.

Replace DCI security switches of the Light Processor compartment (reference 1 image & 2 image)

Malfunction Signal Backplane

If switch replacement cures nothing then replace Signal Backplane. See service manual chapter "Card Cage".