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From: bbb@ariel.UUCP (BRUCE B. BIRT)
Newsgroups: net.micro.pc
Subject: Re: AT&T PC6300 hard disk whine
Message-ID: <1002@ariel.UUCP>
Date: Thu, 8-Aug-85 10:14:54 EDT
Article-I.D.: ariel.1002
Posted: Thu Aug  8 10:14:54 1985
Date-Received: Mon, 12-Aug-85 21:36:35 EDT
References: <304@cbuxc.UUCP>
Organization: AT&T-ISL, Holmdel, NJ
Lines: 68

> 
> PC6300 users:
> 
> What follows is an article I wrote for the Computer Club. If you have a
> hard disk it may be something you will need to know.
> 
> mike vrbanac
> 
> --------------------------------------------------------------------------
> 
> 
>   TO:     CRES Computer Club
> 
>   FROM:   G. Michael Vrbanac
> 
>   RE:     SHUGART Hard disk whine
> 
>   DATE:   July 8, 1985
> 
>   Some AT&T PC6300s with a SHUGART model 706 or model 712 hard disk may
>   start to whine.  This whine results from a lack of lubrication of the
>   spindle ground button. A lubrication kit is available from: 
> 
>           Hamilton-Avnet Electronics
>           19515 South Vermont
>           Torrence, Calif. 90502
>           1-800-521-3387
> 
>   A lube kit consisting of a syringe of lubricant and a rubber wedge
>   retails for about a buck and a half.  The instructions say it takes 20
>   minutes, but 45 minutes is more in line. Here's the crux of the
>   instructions: 
> 
>           A. Remove drive from box and unpack.
> 
>           B. Place drive on bench with PCB facing upward
> 
>           C. Take wedging tool and carefully insert the thin end just
>              under the narrow end of the ground flexure. Once the wedging
>              tool is in place, gently roll it downward until the thick
>              end is flat against the PCB and the ground button is raised
>              up off the button bearing.
> 
>           D. Observe at a close distance the area under th flexure. The
>              ground button bearing (round ball on motor)should be visible
> 
>           E. Using the syringe filled with lubricant, insert the tip of
>              the needle directly over the ground button bearing and
>              release a small bead of lubricant approximately the size
>              of a pinhead on to the top of the button bearing.
> 
>           F. Lower the ground button onto the bearing and carefully
>              remove the wedging tool.
> 
>   One potential source of confusion is the syringe of lubricant itself. 
>   It only contains about two drops of lubricant, so when you unpack the
>   kit and the syringe appears to be empty, it isn't! 
> 
> 
> -- 
> 
>  +--------------+------------------------+-----------------+
>  | Mike Vrbanac | AT&T Bell Laboratories | Columbus, Ahiya |
>  +--------------+------------------+-----------------------+
>  | Unix: {cbosgd|ihnp4}!cbuxc!gmv  |  CompuServ: 76054,113 |
>  +---------------------------------+-----------------------+

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