wrote in message
ups.com...
On Nov 7, 12:57 pm, "robb" wrote:
wrote in message

ups.com...
On Nov 7, 7:46 am, "robb" wrote:
no shorts on any of the power regulator chips 5v L387 or
the
L298s

and still get 76 ohm continuity between 5v an 0v ref.

Ummm, what's wrong with that? I = E/R: 66mA. This
(static) current isn't blowing the fuse.

TM

oh yes the fuses blow.

ther were 3 bussman fuses on different lines and such and
they
are all blown

right now i am trying to track down the short(S) so i ca do
better static tests on various components without removing
and
then try and power the board back up and look for other
problems

I wasn't denying that the fuses are blowing - I was pointing
out that
76 ohms is not a short (for most any low voltage power supply),
and
that the fuses aren't blowing due to that (not so low)
resistance
across
5V.

What resistance do you get on the other rails?

apologies, i did notintend to come across as snippity
i wasn't sure if i forgot to mention the fuses

i am a bit perturbed by this event and am not looking forward to
removing all ICs and then i have to worry with ROMs too

although i am an amateur i understand your point. but, i do not
realize the significance due to my lack of experience

so 73 Ohms is not a short where 0 Ohms would be
but my amateur question would be... is 73 Ohms good value between
5V and 0v reference ? i had presumed not good

thanks for your help and ideas,
robb