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Old 12-14-2011, 12:36 AM   #5301 (permalink)
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Originally Posted by amino View Post

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.
OK, can you see what the voltage is on each side of R23 relative to ground before and after precharge?

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