Malfunction Fan Control board or SMPS board.

Measure on the Signal Backplane the +24V voltage on pin 9, 10, 11 or 12 of the connector of the black wire unit which comes from the SMPS board. See image.

If the measured voltage is about 24V then replace the Fan Control board. See "Removing a board in the card cage". Otherwise replace the SMPS board. See"Replacement of the Switched Mode Power Supply".

Damaged insulation of the wire unit (reference 2 image "Anode fan connection") of the Anode fan (reference 1 image "Anode fan connection").

Check the insulation of the wire unit of the Anode fan. The Anode fan is located below the compartment of the Light Processor.

1. Repair the insulation of the wire unit using shrink sleeve.

2. If not repairable replace the Anode fan. See "Anode fan".

Malfunction Signal Backplane (bad connection)

Replace the Signal Backplane. See "Replacement of the signal back plane".