Watch out!  
I used to clip out the plastic base of PLCC sockets to get better access
to hand solder the pins, but I found that there was a reliability
problem with one of my applications.  The CPU in the socket (32 or 48
pins?) had intermittent operation when the system was vibrated or
whacked.  It seems that the CPU was sitting too low in the socket to
provide adequate contact force for a good electro-mechanical connection.
By placing a shim (the same height as the removed plastic) under the
CPU, the contact points were moved up the socket pin (down the CPU pin)
to provide more contact tension, solving the intermittent problems.  






Carl Van Wormer
Cipher Systems
1800 NW 169th Place, Suite B-100
Beaverton, OR  97006
Phone (503)-617-7447 extension 20    



-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Steve Gregory
Sent: Wednesday, November 07, 2007 8:05 AM
To: [log in to unmask]
Subject: Re: [TN] Plastic PLCC socket rework.

You're exactly right Joel. That's the way I've always reworked PLCC
sockets for as long as I can remember...

Steve Gregory 

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Joel Alexander
Sent: Wednesday, November 07, 2007 10:02 AM
To: [log in to unmask]
Subject: [TN] Plastic PLCC socket rework.

If we have to replace one of these it has been a common practice to cut
out the bottom in order to gain easy access to the leads when hand
soldering. It was thought that the bottom was mainly there for pick and
place purposes. 

Does anyone do it this way and know if this is industry acceptable
practice



Joel Alexander
Quality Assurance Manager
TT APSCO, INC. 

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