I Believe that it will output the both at the sametime, there is an option on the
dimmer output
page of the 7500 that allows you to select mcx or
dmx, but I believe this is more to just adjust for the fact that
dmx can have 512 addresses, and mcx only 128.
the other option on the nsi6000 is you can get an upgrade kit that adds the
dmx chip and the 5 pin
xlr connectors so you can convert over to
dmx
are the same channels out on both
dimmer packs? there are fuses that can be hard to get out and are the kind that you need to use a
meter to test, Most of the time if it is a
circuit problem inside two channels go out at onec
Also check that you have the addressing set correctly, if you remove the mcx connection does all the outputs go to full on?
NSI does offer a fixed fee refurb service
Sharyn