Quote Originally Posted by Waterlogged View Post
The FET's on the MCP355 have been known to be bit buggy at times. I remember a on guy here that got some replacement FET's from Laing Hungry and was able to replace it and got his working again, though that won't do Jeff any good as the PCB is torched pretty good.
Meh, it may be the original DDC-3.1/3.2 PCB but someone might find it useful...



Most of the catastrophic failures that I saw in the DDC-2 and DDC-3.2 involved toasted FETs. Thinking on it briefly, if a cap fails it's going to either short or go open circuit (the latter being more common, as I recall)... the result of which would depend on what the cap was doing in the circuit (in a motor like this, I suppose it could be anything from borking the time constant to maybe leading to an overcurrent situation if they're somehow using the cap to throttle current through the FET... a complete circuit diagram of the pump's PCB would take the mystery out of it).