18 Mar
2005
18 Mar
'05
1:53 p.m.
Mike Cesari said:
If that fast spike looks like:
5v _|___|____
| |
| |
0v ________
... or similar, this can (will) cause intermittent problems when you
load the system
with usage like installation, compiles, etc. Especially when the spikes
bottom out at
less than 2.5v. We saw this cause very "odd" system crashes on 11/70's.
Components on
the h744 regulators started to degrade, `cause DEC pushed these to the
limit.
We replaced the two output electrolytic caps, the output (power)
transistor, and the
two disc caps that should be at the mate-n-lock that should go from 5v
to ground.
(These are an ECO from the late `70's.)
etc.....
What does ECO mean?
Ashley