After reading XenonMan's post I checked on my unit(s) again; I hear an audible click from both units just about simultaneously, but the blue light on the 7500 comes on 4 seconds after turning on 990....
I tried the trigger cable and it seems to work. However, the only way I can get it to work is to first turn on the front switch (blue light) before plugging in the cable, as described in the manual. Once the cable is plugged into the amp there is no way to get the amp to switch to the orange light, even by pressing the front switch.
So the blue light stays on constantly with the trigger wire connected, but I know the trigger control is working because I can hear the relay clicking on or off in the amp when the processor is turned on (with 2 sec delay as I programmed in the processor) or off (immediate).
Does your 7500 switch to the orange light when your 990 is switched off?
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