Path: utzoo!mnetor!uunet!lll-winken!lll-lcc!ames!pasteur!ucbvax!mit-richter.UUCP!krowitz
From: krowitz@mit-richter.UUCP (David Krowitz)
Newsgroups: comp.sys.apollo
Subject: Re:  Disk Block Header Errors
Message-ID: <8802171839.AA04388@EDDIE.MIT.EDU>
Date: 17 Feb 88 17:41:16 GMT
Sender: daemon@ucbvax.BERKELEY.EDU
Organization: The Internet
Lines: 20

If you're getting sporadic DSP80 (not DSP80A) crashes, you might try
replacing the power supply. We had a similar problem some time ago,
with the machine randomly crashing, and we replaced every single 
board in the machine twice! We replaced both of the MSD500's (due
to failures of the old style HDA's!!!) and still had the problem.
Then our service rep measured the power supply output. It was
something like 4.95 volts. The spec was 5.0 plus or minus 0.1 volts.
He replaced the supply anyways with one that put out 5.1 volts.
The problem went away and has never been seen again. We bought
our service rep a case of his favorite liquid refresher as a
token of our appreciation.


 -- David Krowitz

krowitz@richter.mit.edu   (18.83.0.109)
krowitz%richter@eddie.mit.edu
mit-erl!mit-richter!krowitz@eddie.mit.edu
mit-erl!mit-richter!krowitz@mit-eddie.arpa
krowitz@mit-mc.arpa
(in order of decreasing preference)