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Mon, 3 May 1999 14:58:39 EDT |
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Sounds like too much heat for too long, with a long cooool down, have you put
a t/c in the area to run a local profile.
Mike Fenner
...........
In a message dated 29/04/99 09:52:33PM, you write:
>
> TechNetters,
>
> I would appreciate your help in deciphering a defect we are seeing
> across one board after reflow.
>
> The larger solder joints are exhibiting a ring-like structure - there
> are a couple of lines in the joint ringed around the part (as if it
> cooled at different rates depending on how close the solder was to the
> part?).
>
> Also, all of the parts (large and small) have many black "splotches" on
> the joints. Some of them, if you look closely, appear like snowflakes
> or leaves of a fern tre
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