Quote:
Originally Posted by amino
I have been trying to trace the fault. With the controller on the bench again, I checked the voltage at pin 2 of the optoisolator U9, and it reads 4.91V on switching on and 3.75V after precharge. There is no change at pin 4 though.
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OK, can you see what the voltage is on each side of R23 relative to ground before and after precharge?