PAL lighting Posted September 30, 2009 Share Posted September 30, 2009 Hi all, I have recently picked up some of these soundlab dimmers and cant make them work with DMX, I am running a Peral 2004 and these are to be used as a portable rig. They output when set to auto just not when a DMX address is set. Any ideas Cheers Link to comment Share on other sites More sharing options...
bruce Posted September 30, 2009 Share Posted September 30, 2009 Which model of dimmer is it? If I remember correctly, they use a reversed polarity from the norm on the DMX connector - so try making up an adaptor cable that swaps pins 2&3 Link to comment Share on other sites More sharing options...
TomHoward Posted September 30, 2009 Share Posted September 30, 2009 They do, they are a little strange - I have a couple, and the labelling on the outside of the unit is against the norm, although IIRC inside mine there are a pair of resistors on the inputs which are crossed, to invert the polarity so that it follows the marking on the outside of the unit. So it would appear that the circuit was designed with the conventional input, the box was marked incorrectly, and the circuit was modified to fit. As a fix you could swap the resistors back and scratch the markings off the outside. Link to comment Share on other sites More sharing options...
osal Posted September 30, 2009 Share Posted September 30, 2009 used these before as mentioned already just a simple phase reverse adapter can solve this pins 2 and 3 swap on Link to comment Share on other sites More sharing options...
pritch Posted September 30, 2009 Share Posted September 30, 2009 If they're the dimmers I'm thinking of (4x IEC output, analogue and DMX in/out, 16A breaker on the top panel), then it's actually ludicrously simple to swap them over to the correct phase. Open them up, and follow the cable from the XLR connectors to the control PCB. There's a header here that isn't fixed down - centre is common, the outside two wires are data +/-. Unplug this, turn it 180 degrees... sorted. Link to comment Share on other sites More sharing options...
bruce Posted September 30, 2009 Share Posted September 30, 2009 Yours is obviously different from mine, although the external description is the same - on mine, the XLRs were PCB-mounted. Un-crossing the 2 resistors is simple, although it means taking the board out to get to the solder-side. Link to comment Share on other sites More sharing options...
PAL lighting Posted October 1, 2009 Author Share Posted October 1, 2009 THANK YOU!!!! it all makes sence now! I didnt even think to check the polarity of the DMX. I will try it out next time I'm in work. Thank you once again and I'll let you all know if it works. Cheers Link to comment Share on other sites More sharing options...
JonM Posted October 1, 2009 Share Posted October 1, 2009 I had some similar units, I think branded differently. If I remember correctly I opened them up and resoldered the cables that connected to the pins on the DMX 'in' and 'out'. Jon Link to comment Share on other sites More sharing options...
osal Posted October 1, 2009 Share Posted October 1, 2009 on the soundlab ones I used the XLRs were pcb mounted Link to comment Share on other sites More sharing options...
sleah Posted October 1, 2009 Share Posted October 1, 2009 Which model of dimmer is it? If I remember correctly, they use a reversed polarity from the norm on the DMX connector - so try making up an adaptor cable that swaps pins 2&3 on the soundlab ones I used the XLRs were pcb mounted Indeed they are phase reversed - bit like Martin kit from days gone by :huh: Apart from the phase reverse thing, a pretty decent bit of kit considering they're Soundlab <_< Link to comment Share on other sites More sharing options...
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