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Subject: Re: PCB puzzle
X-Newsreader: Forte Agent 1.91/32.564
Date: Sun, 29 Sep 2002 08:42:15 GMT
NNTP-Posting-Date: Sun, 29 Sep 2002 09:42:15 BST
On Sat, 28 Sep 2002 18:09:05 -0700, Kevin Kilzer
>The problem was first isolated to one socket by swapping the devices.
>Everyone expected the problem to move with the device, but we were all
>surprised when it stayed with the socket.
Re-reading this and the original post I am not clear about this connector - can
we assume that it is an IC socket?
Does the failure have some relation to the function of this unused pin of the
How about - with a "faulty" board - cut of this pin of the IC and pop it back in
>We first noted the problem with a 10Mohm scope probe, and observed a
>bad signal level.
Not sure what you expect to see on an unconnected pin - depends a lot on the pcb
layout - a nearby trace with fast enough edges could couple some spikes by
capacitance. Although would not produce low resistance.
PCB contamination due to 'cleaning' should not reach an inner layer.
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