If you have a background or some experience with solid state electronics
and know how to use a DVM or VOM and soldering iron, you're half
way there. If not, you'll need to get an education in this area or accept
the fact you'll have to pay someone to fix your machines.

Normally, for someone new to the hobby I'd suggest getting a non-working
project (SS or EM) and learn that way. But with the machines you have there
is a good chance you'll damage your machines (or yourself) if you go
in blind.
Steve