Mornin' Steve -

You're right!!!   But there's another way to work this thing -

Most important, stay out of the cleaning system - as others have pointed out,
the cleaning system will do more to damage the coating than everything else.
Second most important, don't use a no clean flux, unless you can be absolutely
sure that all of the material reacts to the heat of soldering (which I doubt
in a small rework situation).

Try the following:

Desolder and remove the parts - use no additive flux;

Scrub the affected area with a swab and a bit of 2-propanol to remove the
coating residues;

Pretin the new part, so it is as solderable as possible;

Solder new part, either using no flux or with a tiny bit of RMA flux;

Scrub the affected area with an acid brush and a bit of 2-propanol;

Dry the board - a brief pass thru an oven at 80-100C will get rid of all of
the surface moistures, etc.;

Patchcoat with a spray can of Humiseal 1B73, using a window mask cut from
teflon or similar sheet to limit the overspray.  (This should be done rather
promptly after drying, when the board has cooled.)


Have a fun day guy - Kelly

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