Tom,

one thing you should investigate is if the pins are disconected (that is the
joint was good after soldering and something makes it fracture) or you have
an open joint from the beginning.

So, is the socket manually or auto inserted? Is the socket reflowed or
manually soldered? The sockets have leads with a spring like shape, very
easy to get good fillet at the toe and no solder at the heel.
We also had issues with open solder on PLCC44 sockets and it turned out that
we had to increase the apertures of the stencil to 110% the size of the
pads, because there was not enough paste on the pads.

My advice, check the insertion and soldering activities and inspect all the
leads right after soldering with the maximum magnification you have
available. To get a better view, you can break away the pickup pad inside
the socket, just before the inspection.

Ioan

> -----Original Message-----
> From: Thomas Han [SMTP:[log in to unmask]]
> Sent: Tuesday, February 01, 2000 7:17 PM
> To:   [log in to unmask]
> Subject:      [TN] SMD PLCC Socket
>
> 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
>
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