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May 2001

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Subject:
From:
"Stephen R. Gregory" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Mon, 21 May 2001 11:22:32 EDT
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Hi ya'll!

Well, I survived all the tornados we had yesterday...almost a dozen of them
all around my area!

Came in this morning and one of the supervisors showed me a board that came
out of a temp cycling oven after being in there for 32-hours...the temp
cycles are from 0-70 degrees C., 14 cycles over 32-hours. There were around
15 other boards in the oven,
but one came out looking like there was acid spilled on the backside, mask
was off all over the back, solder joints had been eaten away, as well as
pads!! It was the only board that had this...go to:
http://stevezeva.homestead.com/index.html

I've been asked what may have caused this...it looks to me like there may
have been some flux left on the board. Some say that it may have happened
from condensation that may have occured during the temp cycle, I say if that
was the case, all the boards would like this. Something else had to be
involved for the copper and solder to be eaten away like this...what do you
guys think?

-Steve Gregory-


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