Newsgroups: comp.sys.xerox
Path: cantaloupe.srv.cs.cmu.edu!rochester!rocksanne!news
From: gjohn.roch811sd@xerox.com
Subject: Re: Old Xerox 8000 Revival Technique 
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Date: Sat, 22 Jul 1995 00:41:08 GMT


In Article<173E013343S86.KCOOKE00@ukcc.uky.edu>, <KCOOKE00@ukcc.uky.edu> write:
> Path: rocksanne!rochester!udel!news.mathworks.com!newsfeed.internetmci.com!lamarck.sura.net!news.uky.edu!ukcc.uky.edu!KCOOKE00
> From: KCOOKE00@ukcc.uky.edu
> Newsgroups: comp.sys.xerox
> Subject: Old Xerox 8000 Revival Technique
> Date: Wed, 19 Jul 95 21:50:59 EDT
> Organization: The University of Kentucky
> Lines: 26
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> 
>  
>     You may remember the saga about a Xerox 8010 that was carted off
> to the junkyard, survived forklifts, and a weekend of rain but still
> recovered after it's owner discovered it missing.  Well, a recent power
> failure took the thing down.  It wouldn't reboot.  The MP code displayed
> 0149 (unable to locate boot device) and diagnostics crashed at 0638.  Technical
>  support said it was finally dead (the hard drive anyway)
>  
>      Well here's a recovery technique that I'm sure Xerox doesn't recomend.
>  
>       1. With the machine ON, remove the side cover plate exposing the
>          fuse buss and hard drive case.
>       2. With sufficient force to indent the Hard Drive cover plate at
>          least 1/4 inch, kick the drive case three times on or about the
>          disk drive reference sheet holder (lower left hand corner)
>          NOTE: If the processor rolls on it's castors more than an inch or
>          two, reduce the force of the kicking action.
>       3. Continue this action until the sound of the platters spinning or
>          read write heads can be heard in motion.
>       4. Reboot
>  
>      It worked.  The bouncing keyboard is back!
>  
>       Ken Cooke
>       Dedicated to preserving an elegent machine.
>  
Don,
	I have used this technique myself.  You don't need to have the
machine turned on.  This risks blowing some electronics. 
	The problem, referred to as "sticktion", refers to the heads
of the disk drive resting against the platter, and the drive motor is
unable to overcome the startup torque needed to bust loose. 
	By lightly "jarring" the drive to move the head/platter just
enough to free up those mechanicals, you can then reinsert the
drive and power on.  If successful, you will hear it spin up.  If not,
you can re-attempt the operation with slightly harder jarring of the drive
assembly.  
	This problem manifested itself mostly on Seagate 80MB drives.  Most
people do not want to attempt this, and it is suggested that you back up your
data, as the situation will likely recur at some subsequent power off.

GLAD TO HEAR YOU STILL ENJOY THE ELEGANCE OF THE GLOBALVIEW ENVIRONMENT!

Note:  This message created from recyclable electrons!

