Yep! Our assmebly house bakes the boards for about 3 hours at 90 deg C to
dry them out after a wash.

Peter



                    Warren_Crow@I
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                    <[log in to unmask]        Subject:     [TN] Baking of Assemblies?
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                    01/19/02
                    05:03 AM
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                    Warren_Crow






This should be good fodder! We wash PWAs in a water hurricane type machine,
with
a hot air blower at the end of cycle. We noticed some components mainly
elect.
alum. capacitors have high capacitance. After research on cap. we were
instructed to bake assemblies 20 mins @ 100c to dry them. The long term
effect
of the moisture in the cap would cause electrical leakage then failure due
to
corrosion.
Well this idea expanded into a question should we bake all assemblies
because
many other items such as transformers, pots., coils are not hermetically
sealed.
And then there is the issue with pwb material its self.

My question to the forum is, Does anyone bake after wash as a standard? All
points of view are welcome.

Thanks!

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