31 May
2002
31 May
'02
3:01 p.m.
At 11:36 PM 5/31/02 +0100, you wrote:
This is the kind of situation in which an HP547A current probe is
most handy. You can easily follow the high current path with it.
Of course, you need to monitor (and limit) the current supplied to
the board under test.
carlos.
--------------------------------------------------------------
Carlos E. Murillo-Sanchez carlos_murillo(a)nospammers.ieee.org
I guess I will
just proceed with repairing the board. The 24v input seems
to be shorted to ground -- that shouldn't be to difficult to find.
Probably a shorted decoupling capacitor (if it's a 'dead short' or close
to one). I have been known to carefully cut power traces to find out
which section is shorted, and then home in on the problem. Or you can
desolder components to test them.
Don't use the trick I once saw recomended of applying a high current
(10's of amps) PSU to attempt to burn out the short. Something will burn
out, it's true, but it will just be the weakest connection, not
necessarily the shorted component.
-tony