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Hi Dave and Bojan,
Thanks for your advice and generous offers. I am embarrassed to say that after looking more closely, the problem was a blown fuse on the overvoltage circuit. I have the overvoltage circuit installed to allow faster slews. I had forgotten they also had their own fuses.
I also found a loose wire on one of the cigarette lighter adapters that supplies power to the board. I suspect that may not have helped matters. Motors are fine and the circuit board also appears OK.
Thanks again,
Rod.
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