I've used logic analyzers a *lot*, and have found
that they almost
always save me a great deal of time. However, I've mostly used them on
equipment where I *completely* understood the hardware design, either
because I was involved in designing it, or because I'd spent a great
deal of time studying the hardware documentation. I think a logic
analyzer would be considerably less useful trying to diagnose a failure
of equipment of a design with which I was not intimately familiar.
Trying to repair anything if you don't understand what it should be doing
and how it should eb doing it is a waste of time. If you don't knowwhat
it should be doing, how on earth can you tell if it's faulty...
-tony