HP 10529A Logic comparator

Has anyone ever made a specific list of 74 series chips that this cannot
successfully diagnose?

Or does it depend on the circuit in which they're placed (what the inputs /
outputs are tied to)?

I seem to remember being told once that it can't always successfully diagnose
certain logic chips. I don't have enough field experience to know when i use
it if the results I'm getting indicate a faulty IC or just an IC it can't
reliably diagnose. In fact, so far i don't think it's been of any use to me
whatsoever.

Obviously i'm ignoring those with more than 16 pins!

More specifically, i was looking at some 74LS157's the other day that are part
of a 2 to 1 multiplexer prior to some ram ICs. The one that had the WE lines
as two of the outputs was showing a fault on both of them, but replacing it
made no difference, i thus assumed the comparator was giving a false positive
(or negative!).

Was this right, or should i really continue to suspect that IC? It's
definately in the part of the schematics where my problem lies.

Please excuse if it's a bit of a dumb question to some, but i'm merely trying
to familiarise myself better with some of the tools that i've picked up over
the course of the last few years.

Thanks,
Martin.

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Received on Mon Mar 29 14:36:48 2004