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FAQ 10026
Why has my DMX stopped?
Pear/Tiger:
There could be a few reasons for DMX to have stopped outputting:-
1) The driver chip 75174 needs replacing. Use on board spare
2) The opto driver 6n137 needs replacing. Use on board spare
3) Corrupted memories. Need to perform a wipeall.

Expert:
1) as above
2) As above
3) Usb data to hub or dmx boards are corrupted. Reseat usb connectors to and from dmx boards/hubs.
Check green Leds labelled TX1 and TX2 on the u dmx output boards are lit.

Diamond 4:
1) Check led status beside dmx output should be green. Can be viewed from the back panel without opening the desk
2) Check power connection to the dmx boards.