[Amps] RE: 8877 Test

[Japerlick at aol.com]

I agree with Paul's note here.  Actually, dishwashers are not uncommon in 
printed circuit board manufacturing lines.  However, excellent cleaning processes 
rely on a good detergent or solvent (though most have gone away from solvents 
due to environmental problems) in clean, softened water.  Clean means 
Purified (definitely not tap water).  Then, the assembly is final rinsed with 
De-ionized water (DI). The DI water is done before the unit is allowed to dry.

You can do the same with solvents, and yes, some solvents won't dissolve some 
organic residues.  When in doubt, I always use 99% alcohol or even MEK or 
Tricky (1,1,1 Trichlorethylene) but the last two are really bad SH_T and you 
don't want it lying around!  Same for DI water.  

I am surprised by the 409.  It is a fabulous degreaser but I am almost sure 
it left some sort of residue.  It just smells too good not to be perfumed.  
But, then, if the folks at Jennings highly recommend it, I can't argue.  I would 
have preferred alcohol.

John

> Dishwashing can leave surfactants and or fragrances behind on your
> components when done.  The hardness of water can also leave trace inorganic
> reside on the device substrate, as well.  Washing with a straight surfactant
> in deionized water, followed by a DI water rinse should work well for
> leaving little residue.  Does Formula 409 leave any residue behind?  I don't
> know.  All I know is that the technicians at Jennings recommend use of this
> product for cleaning their capacitors prior to high voltage use.
> 
> 
> 
> Cheers, Paul WN7T
>