The wire unit of the temperature sensor at the front of the DMD is mistakenly switched with one of the wire units of the other temperature sensors of the Light Processor Unit.

Check if all wire units of the temperature sensors are plugged into their respective sockets on the Signal Backplane (reference 2 image "Red DMD front temperature sensor connection".

The wire units of the Peltier elements (TEC's), mounted on the common cooling block of the heat pipes, are mistakenly switched.

Check if all wire units of the Peltier elements are plugged into their respective sockets on the Signal Backplane.

No thermal contact between heat pipes and common cooling block due to loose screws.

Check if the four screws, which attach the heat pipes of the involved channel to the common cooling block, are fastened.

Malfunction Peltier element (TEC) between heat pipes and common cooling block. Use the “diode test” of a multi-meter to check out the Peltier. Polarity does not matter. The Peltier is OK in case the measured value is higher then 0,01 volt.

Remove the light processor from its compartment and replace the malfunction Peltier. If problem persist, contact Barco for further instructions.