In a message dated 02/01/2000 6:15:30 PM Central Standard Time,
[log in to unmask] writes:

> We ran a batch of boards that had surface mount PLCC84pin sockets.  PLCC
>  components are placed prior to shippment.  Our customer have noticed that
>  few boards had disconnected socket pins(one per socket).  Only thing that I
>  could think of that would cause this to happen is, installation of PLCCs
>  into its socket, creating enough  shear force on the connector to break the
>  solder joint.  I didn't get a chance to look at the broken solder joint
>  itself, but I took a look at some of the finished goods in house, and the
>  plastic housing on the sockets bow out a little bit upon insertion of PLCC.
>   Has anyone seen this before?  What else might cause this to happen.
>  Customer had stated that the solder joints are well wetted.  Any input is
>  greatly appreciated.
>
>  Tom

Hi Tom!

I think most manufacturers of PLCC sockets got the dimensions down so that
there shouldn't be any damage created when inserting the PLCC. Now they're
gonna be tight, but that's the way they're supposed to be. If it were indeed
the socket, you should see the problem on more than a few boards I would
think...

But, should something happen like a mistake made by someone inserting them in
the wrong way (wrong polarity), and then they realize it and go back and
correct them by prying out the PLCC with something other than a PLCC pulling
tool, I could see where that might happen...especially with a large
84-pin...gotta pull those things out carefully with the right tool.

Just a guess....

-Steve Gregory-

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