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December 1998

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Subject:
From:
Jim Gleason <[log in to unmask]>
Reply To:
Jim Gleason <[log in to unmask]>
Date:
Sat, 12 Dec 1998 13:36:41 -0600
Content-Type:
text/plain
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text/plain (59 lines)
I have seen this with vme connectors. It was due to  connector not allowing
the board to  expand at the same rate as the material around it. We ended up
using a stiffener that held the board and the PCB and did not hard attach
the connector to the board ( i.e did not screw it down till after it was
soldered.
jg

-----Original Message-----
From: [log in to unmask] <[log in to unmask]>
To: [log in to unmask] <[log in to unmask]>
Date: Friday, December 11, 1998 10:29 PM
Subject: [TN] Warped boards at PCI connector?


>To technet
>I have this board that is 18 by 14 though hole and SMT. After reflow the
board
>looks good not warped. Once assembled and sent to wave the board warps,
only
>around the PCI connectors. It warps so bad I don't have any lead
protrusion. I
>have tried to run this board many ways fast slow and minimal preheat. I
still
>have this problem. Has anyone ran into this problem before? Is this common
>around PCI connectors? I recall this happening once before many years ago,
I
>resolved it by tacking down the edge and middle of the connectors then
>masking. Is this the only fix? Any other suggestions
>
>Thanks in advance
>Angie
>
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