I am having trouble running an american dj quad gem in dmx mode. I have other lights that are working fine.

In slave mode the second pack should be controlled by the first pack in the chain, not the foot controller. I think you probably don't want to be using slave mode if you are using external controller... try setting the packs to the same address so they both track the foot controller.

Uncover it... you will probably find that some of the LED's are not lighting. OFTEN soldering on circuit boards OR a bad LED in a string kills several like Christmas strings. More than this you need to be somewaht adept at electronics to repair it.

You would need to have the OPTIONAL DMX timer remote unit which allows DMX control of the fog machine.

The Triacs in the unit probably have shorted. They use a 16 amp Triac in most of these. If none of the stand alone funtions work, this is the likely cause.

Usual problem is unit hasn't been put into sound activation mode. Make sure the display says:

"SOUn" and select the "on" in that mode.

It is probably in the wrong mode. Since the light can be set for automatic, sound, and DMX we have NO idea what mode you are trying to run. Refer to page 8 and 9 in your manual for correct dipswitch setting for whatever mode you are running.

For eye protection, the lights must keep moving or they will shut down... which is likely what is happening in your case. If you put in auto mode or sound mode they should keep on. If in DMX mode and the mode does not command movement all the time, they will extinguish.

Send power to all and link them all with a daisy chain of DMX cables output to input. Set all to the same DMX address on the switches. Use DMX cable to your controller. If you don't have a controller, set the first one as master to an auto mode or sound trigger.

The Triacs are probably blown. If you overloaded this OR tried to drive lights that were NOT incandescent or used transformers this will destroy the Triacs.

Verify that you have a terminator resistor at the end of your DMX cable of there are several units daisy-chained. The resistor prevents digital signals from reflecting causing confusion of the data stream. Read up on DMX termination via google.

The pdf file for the controller can be viewed/downloaded here:

http://cachepe.zzounds.com/media/DMX-OPERATOR-PRO-REV1204-e0620564d5df74c0b77872e71859c38b.pdf