express 24/48 no dmx output

hi folks i'm new here, just wondered if anybody could give me some advice please.

i've been given an express 24/48 for free but it has a small problem, it appears that there is no dmx signal coming out of the first universe at all, but the second one works as normal, when i change the settings so that both outputs have the same signal i get the data for dmx adresses 1-512 on the second output(as i would expect) so this leads me to thing it's an electronic problem rather than a software problem, is there any common faults which occur on these which might cause the output to cut off completely?? i remember changing a small 8 pin opto-isolator on an avolites console a while ago which was showing a similar fault.

thanks, tom

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Steve Bailey over 15 years ago

It sounds like a bad output chip on the DMX 1 port.
There is no opto-isolator circuit on Express, the chip functions as the "fuse". The DMX 1&2 ports and the RFU port all use the same chip.
Since it's a free-be, I'd suggest removing the brick - I.E. the back electronics section and swapping chips to see if that is the problem. Pay VERY close attention to how the brick gets removed as it's a *** getting it back on.
If it's a bad chip, an ETC dealer can get a replacement, or if you are not planning on using an RFU or port 2, then use that chip instead..
Steve B.
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DramaKing over 15 years ago in reply to Steve Bailey

thankyou very much for your reply, i shall give it a try when i get a chance
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Steve Bailey over 15 years ago in reply to DramaKing

Good luck with it and don't forget to call ETC Tech Support if you can't get it working or run into trouble.
Steve B.
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Steve Bailey over 15 years ago in reply to DramaKing

Good luck with it and don't forget to call ETC Tech Support if you can't get it working or run into trouble.
Steve B.
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