Re: Dissolve printed circuit? - Saab General Bulletin Board - Saabnet.com
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Re: Dissolve printed circuit?
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Posted by Dean (more from Dean) on Mon, 25 Sep 2017 08:35:20 Share Post by Email
In Reply to: Dissolve printed circuit?, Justin VanAbrahams [Profile/Gallery] , Sat, 23 Sep 2017 20:10:51
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I have done something like this many times when repairing or modifying amplifiers, preamps, CD players and speaker X-over boards.

Simply scrape off some of the "mask" to expose copper as a new solder pad and drill a new hole if that is of advantage. The exposed copper need not have a perfect removal of the mask or have perfect margins. I use the tip of a pen knife that is more often than not a bit dull which means that copper is not significantly removed.

Acetone does not remove the silk screened mask from circuit boards. That is what I see from cleaning residual resin flux from the boards which does remove the flux.

When you create a new solder pad with heavier gauge wires, tie the wire off to something mechanical as a strain relief, otherwise stresses on the wire can tear the copper off of the board.

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