I am currently in residence at a Højskole in Denmark that uses a Sirius 24 for all performance events, just before the start of last night's show, all of the channel LEDs turned on and the faders became non-responsive, all dimmer outputs were off. The console was switched back on and none of the LEDs became lit, the faders still had no effect and the dimmer outputs were at zero. This cycle was repeated for some time and then all returned to normal as if nothing had happened.
Today I have done some testing and managed to replicate the issue on the bench many times but with no decernable cause. The power supply rails all measure out correctlyband there are no obvious signs of failure on any of the PCBs.
I am hoping someone has some ideas as the the route of this issue so that I can repair the console, it may be old but it is in fantastic condition and integrates with the remainder of the system on site. This console does not have the DMX board fitted, analogue output only.