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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