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Date: | Mon, 8 Nov 1999 08:52:11 -0500 |
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Hi Ken,
I don't know Alpha E191/1 flux but, I doubt flux contamination would
disappear overnight. Is it possible the assemblies are still wet and
shorting out? How do you clean them, if it isn't a no clean system?
Hans
~~~~~~~~
Hans M. Hinners Materials (& Process!) Engineer
Warner Robins - Air Logistics Center
Avionics Production Division/Manufacturing Branch (LYPME)
380 Second Street, Suite 104 (Building 640)
Robins AFB, GA 31098-1638
912-926-1970 (Voice) 468 - 1970 (DSN) 912-926-7974 (Fax)
[log in to unmask]
> Hi,
>
> We currently have a problem with some of our assemblies failing
> functional test due to conductance between parts of the board.
> What we notice is that there appears to be a residue on the topside
> that disappears overnight and the assembly then passes test.
> Is this a flux issue or could it be something on/in the bare PCB that
> would cause this.
> The flux we are using is Alpha E191/1 through Electrovert wave solder
> machine.
> Anybody any thoughts?
>
> Ken Robertson.
>
>
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