On Tue, 22 Aug 2006, OK Don wrote: > I've already re-soldered this unit once - but the switches act dirty. > I bought another one to work on, so I'll see if I can get some de-oxit > (?) into the switches, then re-solder the thing. There sure are a lot > of connections on those boards!
Use deoxit. You might want to try the non-aerosol which is 100%. make sure to work the switch several times after applying it. Follow it with cailube. I dunno how the switches in those units are made, but if you can get to the contacts, tarn-x works wonders (more than one stack switch in a preamp or scope has been resurrected with tarn-x)... Oh yeah... completely remove ALL of the old solder and rpelace it with new. The old stuff is utter crap. Use 63/37 if you can find it, with that stuff it is quite hard (theoretically impossible) to make a cold joint (looks good but is bad) -j.
