After a recent rainy shoot, fader #3 started behaving erratically. The fading action would jump around, regardless of the fader's position. I ordered a new pot and replaced the fader, but this did not cure the problem. Going back in, I re-soldered the new pot and also re-soldered a past repair on fader #3, which was probably the issue,a Surface mount resistor. I don't have a proper SM soldering iron, so I had to wing it with a pinpoint soldering tip. Normal soldering tips can obliterate an SM component and the surrounding traces.
by Pete Verrando