xl dmx fluctuation

[nighteyes]

i have an old xl console, i'd like to repair. The dmx output on all the channels seems to be fluctuating in value. wich means a scan mirror or a par can will start vibrating because its getting different values all the time. The fluctuation is about 5 % of the set value. Any quick ideas where i should try looking? (electronically speaking).

[KWR88]

First thing I would look at is the DMX driver IC and possibly the A/D circuit as the flicker may be due to this not having a stable output.

Please e-mail me direct on krogers@zero88.com as I can give you some other thing to check out.