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#11
06-19-2019, 11:03 PM
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isopropyl alcohol 99, Chemtronics ES835B , and a remover for water base flux,
what ever was used, it is very hard to get off. I can tell, that the untouched parts of the set have OLD rma flux on them still. this i almost never used any more in production, but was used a lot back then. we use water soluble and no-clean,( lead free) I had to get special order leaded rma solder to work on this. when the resistors were replaced, some unknown type of solder was used, and the flux mix caused a white scale that has to be almost scraped off, not alcohol or Chemtronics would really soften it much, I gave it a good try and got some off but was afraid of damaging things. 17 pF on the crystal? that narrows things down a lot ( so may options looking them up  ) i assume Mouser #: 520-HCA357-17X is the same? 
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