I have seen this condition caused by over active chipwave and excessive
setting on an omega wave. The omega wave is a vibrating plate in the
solderwave that produces turbulence in the lambda wave (main wave) that is
perpendicular to the normal wave dynamics. The action forces solder up
through the board, bridges form at the heels of the springs that form the
socket contacts.

> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]]On Behalf Of Andre Leclair
> Sent: Tuesday, April 23, 2002 2:27 PM
> To: [log in to unmask]
> Subject: Re: [TN] Shorts in PLCC Sockets
>
>
> base on your description, the following questions come to mind:
> 1. Could the part have come with the condition?
> We are investigating with the part manufacture with no results as of yet.
> They are
>
>  2. Is there an open area in the PCB, near the socket in question, through
> wich solder can over flow and get underneath the socket?
>
> There are no holes in the PCB near the socket where solder extra solder
> could have migrated under the socket and then under the pin
> retainer.  When
> the socket was removed there was now evidance that extra solder had been
> between the board and the socket base.  For the amount of solder that was
> between the base and the main body of the socket there should have been
> evidance of solder ( the plastic body marks very easily at 500'F).
>
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