Russ wrote:
Could some people give me their idea of the steps to take when
repairing a Digital system? Let's assume I don't have the schematic or
other paper on these boards. They are arcade game boards. On this one
particluar board I am working on it comes up with a work ram error. I
checked all of the RAMS and they check OK. What is the next step? Maybe
something with the address line? It is a system running on a 68000.
Also if I am checking pins on different chips with my scope what are
the levels that would point to a bad chip or node. Anything below .5
volts and above 4 volts? Still confused on this one,
Thanks
Uriah



There aren't any set steps to solving the problem beyond the basic
checks for voltage and stuck address lines. Repairing boards like this
is somewhat of an art, it just takes a lot of practice and a good
understanding of the building blocks used to create it.