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From: hanche@imf.unit.no (Harald Hanche-Olsen)
Newsgroups: comp.sys.apollo
Subject: Re: 10K power supply problem
Message-ID: <HANCHE.90Dec7183435@hufsa.imf.unit.no>
Date: 7 Dec 90 17:34:35 GMT
References: <9012070028.AA04240@wolf.Uwyo.EDU>
Sender: news@ugle.unit.no
Organization: The Norwegian Institute of Technology, Trondheim, Norway.
Lines: 26
In-Reply-To: waldram@WOLF.UWYO.EDU's message of 7 Dec 90 00:28:52 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.

Yes, we have seen that.  Someone may find our cure for the problem
amusing: Just removing one of the 5V so-called booster modules cured
the problem.  Of course, this was done by our qualified HP service
technician who determined that there would still be plenty of spare
capacity for our configuration.  The reason it works is supposed to be
something like: With fewer modules, they work harder, and so are less
likely to exhibit the problematic oscillations.

Something to consider for other unfortunate souls with this problem,
without a service contract, and spare capcacity in the yposer supply.

- Harald Hanche-Olsen <hanche@imf.unit.no>
  Division of Mathematical Sciences
  The Norwegian Institute of Technology
  N-7034 Trondheim, NORWAY