so Marco is it just the on air jog wheel display light that your having trouble with?.then it maybe cdj # has not been assigned properly you say your running it on channels 2&3 on mixer .if you raise the fader up on channel up on 3 theres nothing,then try 2 & 1 even though its not connected channel through it, if the light still comes on then you know its still 1&2 by default & 3 is not assigned.