Preparing the board for service. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Ham Radio Technologies
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Many radio amateurs service the printed conductors in the manufacture of the board. To do this, it is usually first cleaned with abrasive powder or fine-grained sandpaper, reducing the already small thickness of the foil. I suggest a different way.
After etching, the protective paint from the board must be washed off with a solvent, rinsed in warm water and dried. With a soft brush, apply a solution of citric acid, consisting of two volume parts of powder and one part of water, to the printed tracks.
After about half a minute, wipe the board with a cotton swab and let it dry. After this treatment, the surface of the foil is easily tinned. This solution is also convenient to use when servicing oxidized leads of radio components.
Author: D.Melnikov
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