Logic Card Problems

[perfectsnd]

So lately I have been having a lot of problems with logic cards. So I decided to take all the IC's from a working one and put it in the one that was giving me the problems.  Swapping all the IC's didn't fix the card. I put the IC chips from the non working card into a working card, and the card worked just fine.  So for past experience, other than the IC chips, what is the major point of failure of these cards?

[Matt Sartori]

Which revision of card are you referring to?
Re-chipping these guys seldom works, I have had quite a few head scratching cards with faulty transistors on..
Andy can probably confirm that too 

Matt Sartori.

[perfectsnd]

I would have to look at the revisions. These are G series cards.  One in a 1988 card the other a 1992 card. 

On one I tracked it down to the not sending out the proper signal through a transistor.  The other I can't figure out.

Do the transistors go bad?

[Matt Sartori]

I would have to look at the revisions. These are G series cards.  One in a 1988 card the other a 1992 card. 

On one I tracked it down to the not sending out the proper signal through a transistor.  The other I can't figure out.

Do the transistors go bad?

yes they do 

Matt Sartori

[brewery]

from my experience e series logic cards rarely fail, but g cards certainly do, and it's usually a transistor failure.

try to avoid hot plugging channels, even when in a rush always had the feeling that's what kills them.