Newsgroups: comp.sys.apollo
Path: utzoo!utgpu!news-server.csri.toronto.edu!helios.physics.utoronto.ca!alchemy.chem.utoronto.ca!system
From: system@alchemy.chem.utoronto.ca (System Admin (Mike Peterson))
Subject: Re: 10K power supply problem
Message-ID: <1990Dec7.182641.721@alchemy.chem.utoronto.ca>
Organization: University of Toronto Chemistry Department
References: <9012070028.AA04240@wolf.Uwyo.EDU>
Date: Fri, 7 Dec 90 18:26:41 GMT

In article <9012070028.AA04240@wolf.Uwyo.EDU> waldram@WOLF.UWYO.EDU writes:
>FYI:
>  DN 10000 owners:
>   We have experienced some severe power supply shutdown problems
>on our 10K.  Symptoms are:
>   1) System loses main power.
>   2) Standby lamp on front pannel lit
>   3) Error status 30 (HEX) on EuroCard power supply plugged into
>      the bottom of the X bus.
>
>Situation:
>A problem has been identified with the DN100X0/DSP100X0 power sys-
>tems in both Manufacturing and the Field. The power system shuts down
>due to a +5 Volt OV (Over Voltage) failure.
>
>After having tested different +5 Volt Booster Module configurations,
>R&D has concluded that Booster Modules with 1988 Datecodes are the
>direct cause of the +5 Volt OV (overvoltage failures).

We have had our power supply replaced 4 times in 2 years with exactly
this problem - does anyone know what, if any, revision of this board
fixes the problem (our board went from Rev 2 to Rev 4 when it was
replaced last week - are we now "protected")?
-- 
Mike Peterson, System Administrator, U/Toronto Department of Chemistry
E-mail: system@alchemy.chem.utoronto.ca
Tel: (416) 978-7094                  Fax: (416) 978-8775