Path: utzoo!attcan!uunet!tron!rtaylor
From: rtaylor@tron.UUCP (Randy Taylor)
Newsgroups: comp.sys.apollo
Subject: DN10000 problems
Message-ID: <677@tron.UUCP>
Date: 10 Dec 90 21:33:56 GMT
Reply-To: rtaylor@tron ()
Organization: Westinghouse Electric Corporation
Lines: 77

I have a weird situation with my DN10k and the posting listed below may
be part (or all) of the solution :

::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.
::
::   There is a SERVICE NOTE on the +5 V portion of the 10k
::power supplies dated 18 June 1990.  A summary of the text follows:
::
::DN100X0/DSP100X0
::Serial Numbers: All
::
::Date Code: All +5 Volt Booster Modules with 1988 Date Codes
::Performed By: HP/Apollo Qualified Service Personnel Only
::Parts Required: +5 Volt, 150W Control Module (APN 010524-001)
::
::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.
::
::Having evaluated several Power EuroCards from Manufacturing and
::returns from the field, R&D has identified an oscillation on some of the 
::+5 Volt Booster DC/DC Converters.  This oscillation forces the +5V
::output voltage to exceed +5.3V dc and the microprocessor shuts down
::the power system.
::
::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).
::
::                             -jjw
::waldram@grizzly.uwyo.edu
::jwaldram@outlaw.uwyo.edu
::jwaldram@UWYO.BITNET

(1)
My DN10k hangs up from time to time, i.e. if I try to crp to it, the shell
hangs until I try to pst or ld it from another shell - then the crp attempt
unhangs.

(2)
Disk access time slows down dramatically for no apparent reason whatsoever.
This problem is periodic and unpredictable.

(3)
The DN10k crashes frequently. Afterwards, the orphans can be numerous - in
one case, the dn10k lost track of 106 files ! :-()
                
(4)
Finally, the other day, the DN10k shut down with the symptoms noted
in the posting.

I had thought that it was a combination of hardware and software, but from
the above posting, it looks like it may be the power supply.

Has anyone else out there had similar problems ?

Thanks in advance,

Randy Taylor
Westinghouse Electric Corporation
Electronic Systems Group
Friendship Site
PO Box 1897 - MS 759
Baltimore, MD 21203
-- 
rtaylor@sky00.bwi.wec.com  from an Internet site (preferred) 
rtaylor@tron.bwi.wec.com   from an Internet site (alternate)

"...you know I have the greatest enthusiam for the mission." HAL 9000