Fred Terry wrote:
I have a full set of schematics for the Persci but no diagrams for the power supply. I think this is where my trouble could be.
This is a different Bill, Bill S. I'm about an hour south of you. I have several IMSAIs and other S-100 systems but I do not have a Persci drive.
I have no 24v so the latching servos don't function.
In all likelihood, the power supply is linear. If it is a linear and you truly have _NO_ 24V then you probably have a shot transformer or rectifier. Can you put a scope on the 24V line? You will also want to create a dummy load to properly test with. This could be a few cheap old style flashlight bulbs, wired in series.
How do I tell if my capacitors are shot or do I just replace them?
If you have voltage on the 24V line, just "polluted" with a lot of ripple current, then "shotgunning" all of the electrolytic caps should solve your problem. Bill S.