[vcf-midatlantic] newbie

[Bill Sudbrink]

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.