So when I first received this WH2O, Bigfoot wouldn't move at all. Thanks to this forum, I found the busted cap and burnt traces. Fixes those things and he was working like a champ. Fast forward 6 months of no issues, and he is acting up again. This time, he moves during the power on test, but it is very slow. To the point where he gets stuck on the diverter when passing it. In test mode, he will spin both directions (clockwise better than counter), but again very slow. Sometimes he speeds up as he goes, and sometimes not. Both optos are reading, but I get a fail on the location test. I've tested continuity between - of C2 and C3, and from R9 to the middle leg of Q1 on the bi-directional board. Both traces good. Seems like the motor speed and location would be different issues, but as they just popped up at the same time, I'm sure that they are not. Anyone have an idea of what to test on the board next?

Thank you,
Aaron

OK, so I've cleaned up my mess on the board, and have gotten closer to solving at least one of my problems, but I still need help. In Bigfoot head test, I am getting 12v in one direction (moves fast), and just over 6v in the other. I have tested the tip102's and tip107's (on board) and they all read between 350 and 800. Just replace them, or something else?

Thanks,
Aaron

Yes, same board, but all cleaned up (now that I purchased a WS51 and am no longer using a gun ). Would Q1 corrosion drop voltage in 1/2 to red side of motor? As I am getting full voltage to White side, would top (not in front of board so can't see label) TIP102 be a likely culprit? I am not smart enough to know what might drop voltage in 1/2 to one side. I'm assuming I have a burnt trace that I haven't found yet, or bad TIP102, but just don't know.

When you say "Compare TIP102 Q1 and Q3 with each other. And Q2 with Q4", how far apart before there is a problem?

Thanks,
Aaron

Thanks I will give that a try tonight.

Well, after lots of testing, ended up replacing U1. I also cleaned up my previous hacks and ran 2 nicer jumpers across burnt traces. Thanks for the assist as always, and hope that this thread helps someone else.