John Said:

>Another test: if you run two bare boards through reflow, with one
>"top" facing up and the other facing down, do both boards warp in
>the same direction, or is it always toward the "top" (or "bottom",
>as the case may be). The former would point to a reflow issue, while
>the latter would be related to board fab/design.

Good idea, I'll suggest that to the assembly house.

J.

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