[neil]

I’m going to jump back in here. I’ve had a look at the schematic and I can see that there are 2 optocouplers in the circuit, one directly in the signal path. I reckon this is where the issue might be, if the circuit gets to a state where signal is so low that the optocoupler can’t work out if it should be slightly open or closed, so it oscillates between the two states. Could there be a mod that would correct this?
Neil.

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