Lightronics TL-2448 board/Leviton D4DMX prob

[saxaphool]

I'm running a Lightronics TL-2448 board and Leviton D4DMX dimmers.

We have 5 older Leviton D4DMX dimmers with only the DMX input/outputs, but the newer dimmers have the DMX and Microplex inputs/outputs.

After a lot of frustration we discovered the newer dimmer packs are causing an irregular, intermittent dimming of the lighting units plugged into the newer dimmers. The older dimmer packs are running fine.

We've swapped out the newer dimmer packs and the problem it consistent with all of them so far.

Running the newer dimmers in programmed chase mode(non-light board controlled) the problem seems to go away.

Any ideas?

Phool

P.S. Our show is in 2 weeks

[Footer]

Don't know if this is possible, but try slowing down the DMX refresh rate on your console. Also, make sure the DMX chain is terminated and all that good stuff.

[derekleffew]

Maybe something in this thread will help.

[saxaphool]

<Maybe something in this thread will help.>

Yea, I saw that thread...didn't seem to tell me much, other than not to buy those dimmers

<slowing down the DMX refresh rate>
can't seem to find a way with this light board, have the manual, but no mention of that

<make sure the DMX chain is terminated>
yep, terminated and still doing the same thing

with one of the offending lights up, other lights(which aren't turned up) on the same dimmer will flicker on, and you can see the red LED "channel" flicker as well

[TimMiller]

have you tried running the new dimmers to the lightboard by themselves? Do they still flicker? The older ones may be doing some weird MPX glitch. I have seen it happen before. You may be able connect the new dimmers than the old ones and things may be happy. Also you may have a bad cable between the old dimmers and new ones.

[soundlight]

Try isolating the problem - take the controller and the dimmers down, and plug each dimmer pack one by one in to the board and see which dimmers have problems without any external factors.

[saxaphool]

<have you tried running the new dimmers to the lightboard by themselves?>

Yes, this was one of the first things we tried. We had a couple of "new" dimmers we had not hung yet and tried those independently and the same problem occurred.

<Try isolating the problem - take the controller and the dimmers down, and plug each dimmer pack one by one in to the board and see which dimmers have problems without any external factors.> haven't tried this yet

I talked to Lightronics yesterday and they seemed to think it was a channel re-patching issue, and recommended going 1 to 1 on my channels with no re-patching. We did this yesterday/last night and the same problem is occurring. Some dimmers are worse than others.

[LD4Life]

I know this may sound stupid, but you aren't trying to run DMX and Microplex in the same chain are you? About the same problem as using DMX cable and XLR cable in the same chain.

[David Ashton]

try reversing pins 2 and 3 on the control, the symptoms are compatible with a phase reversal somewhere.

[saxaphool]

<I know this may sound stupid, but you aren't trying to run DMX and Microplex in the same chain are you?>

nope, I'm presently about to hang myself with my microplex cable

<try reversing pins 2 and 3 on the control, the symptoms are compatible with a phase reversal somewhere.>

your the second person to mention this... a friend i called asked if there was a phase switch on the board.....gonna give this a try