i am having a problem with the dmx on 2 of my dp640's on one unit when i power it up and send a dmx signal to it the channels start to flash the controller channels are full on and the pack flashes it is in the pack because the other packs work fine the second pack i am having problems with is i lost dmx control on ch 4-5-6 i was wondering if i can just buy 2 replacement boards for the units and if so how much are they
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