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In Reply to: RE: knight 60 circuit board ? posted by unclestu on July 16, 2014 at 20:55:48
...I've been thru a few of these amps and the traces are extremely fragile and prone to lifting for no apparent reason. I've used Q-tips with acetone to clean the crappy fluxes used back then. Tedious but easy on the traces. Acetone goes after the petrified flux better than alcohol and doesn't attack the phenolic substrate. Use with good ventilation.
Follow Ups:
Yeah I'd rather have new boards but this is what I have to work with... What can be done if a trace does rise of the board? Can it be saved or is it trash?
I'm going to clean one of the boards tonight. I left the other connected so I could use it as reference for when it goes back together lol.....
thanks
High sensitivity, wide dynamic range, low distortion, and smooth frequency response. Pwk
Repairing lifted traces can be a bit of an art. I've used #22 tinned wire shaped as nec. to replace or reinforce bad traces. Since the wire needs to be solidly soldered to what good trace remains, everything needs to be clean and oxide/resist free before soldering. I also use a liquid flux and 63/37 solder to keep temp as low as possible.
Thanks for the advice. The first board cleaned up ok. I took it slow and also removed a few caps. Two of them were bad. I guess I'll take it easy and determine if the board was saved when finished.
Thanks again
High sensitivity, wide dynamic range, low distortion, and smooth frequency response. Pwk
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