Yuk! I've seen brown crud on the foil side of the circuit boards my
Paragon and another one that I worked on. In those cases the crud was
excess soldering flux. I cleaned it off with isopropyl alcohol and
cotton swabs. The white stuff may be some kind of oxidation or
corrosion. Mold would be black.
73,
Bob WB2VUF
On 7/15/2017 7:32 PM, Ken Brown wrote:
My Omni VI had some dark brown rubbery stuff on the XTAL osc and BFO
printed circuit boards, It is sort of like rubber cement and reminds me of
similar stuff I found in Kenwood TS-440s. There is also blue green copper
corrosion on the edges of the rubbery crud along with with white powdery
stuff. I think the powdery stuff may be mold or fungus. I have spent
several hours on each board trying to remove it as best I can.
It is not on every board, and not on any of the boards in an older Omni VI.
I am wondering if it is something that was put there by the Ten-Tec
factory, or if some previous owner did it? I guess it's purpose may be to
dampen possible microphonics in the oscillators. It definitely caused some
undesirable, unintended consequences in a humid climate.
Has anyone else seen this in an Omni VI?
DE Ken N6KB
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