Sudden death in the family :(

From: Jochen Kunz <jkunz_at_unixag-kl.fh-kl.de>
Date: Thu Sep 11 10:30:00 2003

On 2003.09.11 14:45 Fred N. van Kempen wrote:

> Is this a "known symptom" with the BA23 power supplies? It's a newer
> one, with the colored wires.
I had this sudden PSU death with a BA23 and a SGI Personal Iris 4D35. I
heard that electrolytic capacitors can cause this but I have no detailed
knowledge about this. :-(

Remove everything from the machine that is not essential for basic
operation. Keep only CPU, RAM, SLU. No drives etc. and retry. Try with
different boards if it does not work. I had the same with my PDP-11/73
in a BA23 and it was a dead TK50 that caused a short. Have a look at the
power wires / plugs at the PSU. Sometimes they get corroded.

Have a look at the cards. Are there any wires from the components bent
and shortened? A friend had a "dead" PDP-11/53 CPU that had some strange
bus errors. (A bit was allways "1".) On carefull inspection of the PCB
we found a wire from a resistor that was bent and connected to a pin
from a bus driver IC...
-- 
tsch??,
       Jochen
Homepage: http://www.unixag-kl.fh-kl.de/~jkunz/
Received on Thu Sep 11 2003 - 10:30:00 BST

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