The red screen in the Depth Camera window means that the Gain setting is too low or too high.
Aim your scanner at what you want to scan and adjust the Gain throughout its range. If you cannot find a setting where the object is shown in gray scale, then the explanation is probably that too much infrared light is shining on the object.
You might try turning all lights off and scanning without color to see if you can get some usable results.
Also, it would be helpful if you posted a picture of the object you want to scan.