Steve, You are right they are a non-modular
dimmer, a fairly basic unit with a test function and addressing switch, nothing fancy at all. They are probably about 10 or so years old now aswell, hence not on the website.
Until I test it, I wont know however I think that you may be right in saying it is a blown
SCR - will give it a go and see what the result is, if not will try swapping around the control card.
I dont believe it is a control issue as the
desk was switched off, the dimmers will still hold state but then the power was cycled to the dimmer aswell which means it would loose any held
dmx states, because the lamp continued to power I would agree that it is either an scr or control.