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Author Topic: Dimmer Problem James Ness Film Handler Posts: 47 From: Houston, TX, USA Registered: Jan 2008 posted 01-29-2010 08:56 PM                        So we have these Drive-In Theater Mfg. Co LD-35 dimmers and we've had one thats been not completely functioning for a while, it will only manually dim using the dial. We had another in a different theater go out today and you can only turn it all the way on or all the way off using the ON/OFF switch, none of the other controls do anything. Can anyone help? This is a huge pain!  |  IP: Logged Tony Bandiera Jr Film God Posts: 3067 From: Moreland Idaho Registered: Apr 2004 posted 01-29-2010 10:44 PM                     The first one has some sort of problem with the automation interface, check out the connections at both the dimmer and automation to make sure they're correct, also check that the automation is sending the pulses (or contact closures) as it should. The second dimmer has a shorted triac, which will need to be replaced AFTER you carefully check ALL of the luminares in the auditorium and make sure none are shorted out (most common cause for blown triacs in dimmers.)  |  IP: Logged Gordon McLeod Film God Posts: 9532 From: Toronto Ontario Canada Registered: Jun 99 posted 01-30-2010 12:09 AM                     disconnect the automation and see how it behaves the triac may be shorted in the second one or possibly the driver has failed  |  IP: Logged

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