I turn on my RC-03 today and the second I switch from neutral to FWD it goes full power 12V to the rails and the potentiometer doesn't do anything. It's stuck either at full FWD or REV. The board smells slightly bad but the caps don't look blown and no broken solders. I tried it with battery only, same result. Is it just the matter of it cooling down or am I out $60? P.S. I have been running it lately on my N scale track and locos, did this cause the problem?
Since these are 'PWM' (pulse width modulated), I suspect the driver transistor has shorted. Did you, in anyway, connect a DC (or possibly AC) power to the output terminals (accidentally, of course ). Or DCC (dual powered layout where a loco or rolling stock would 'short' them together? N should have no impact, unless the motors drew too much current, over a long time, so the output finally failed. Or, full hard short, that the Rokuhan tried to reset over-an-over (like DCC does). Or, possible the motor you were running had really bad commutator and/or brushes were really bad so the BEMF (uh, 'noise') was so large the Rokuhan driver could not deal with it after while. I;'ve see some bad motors with >400 volt transients, thousands of times a second.
