12 Feb
2021
12 Feb
'21
12:40 a.m.
On Thu, 11 Feb 2021, carlos_murillo at ieee.org wrote:
to diminish it. Argh.? A month ago my trusty
HP9000/380 ran just fine and I
[...]
on; the power supply is dead.? So I unracked the pile
of drives and the
computer, checked for obvious things (the fuse is fine, and nothing in the
power supply is swelled up or leaking, or browned by heat; visually, it looks
new; the HV caps seem to hold a charge).? I need the schematics for the power
I recently repaired a 9000/310 power supply. The fault was very obvious if
you are experienced with the components used. My machine was built in
Germany (B?blingen) and has a German power supply that uses electrolytics
from Frako (the golden caps). They tend to simply short
from one moment to
another. In this case one of them shorted the +12V rail and thus
the power
supply shut down. No other blown parts or fuses. Just find the shorted cap
and replace it :-)
Christian