13 May
2006
13 May
'06
12:45 a.m.
On Fri, 12 May 2006 23:29:12 +0200
Gerhard Lenerz <mail at g-lenerz.de> wrote:
but as soon as there is a drive attached to the
internal power circuit
I end up getting a more or less purple display and a machine hanging
during POST.
Maybe a problem with GND. You can get GND from the power connector,
from
the SCSI bus and from the enclosure. (The later is usually tied to GND
of the PSU.) Maybe you have a loop in there.
It's old 5.25" SCSI drives, so probably 12V
is the source of the
trouble... right?
Watch the voltages with a meter. If you own one, use an
oscilloscope to
look for ripple on the voltages.
I am interrested in your mod. I have a PI (4D30 IIRC) with dead PSU
slowly rotting in the basement...
--
tsch??,
Jochen
Homepage: http://www.unixag-kl.fh-kl.de/~jkunz/