[sebhc] Shugart 400L Drive

dwight elvey dkelvey at hotmail.com
Fri Oct 13 23:01:28 CDT 2006

>From: Lee Hart <leeahart at earthlink.net>
>Do you have the HDOS "H17" diagnostic program? It runs the drive through  
>its paces, and tells you its maximum step rate, etc.
>Just about any 5.25" drive will work on the H8 and H89; the challenge is to 
>figure out the jumpers, and get them set the way the Heath hardware 
>expects. This means individual drive select lines, head loads on select, 
>and motors all started by the motor control line.

Like Lee says, just about anything should work. I have a pair of Teak
drives in mine.
Both the original drive and the SA400 are belt driven. I'd suspect
that your main problem is a loose drive belt. These tend to stretch
some over the years. Also, both the flywheel and the pulley, on
the motor, should have clean surfaces. Some times the belts leave
some old rubber or oxide on the surfaces of the flywheel and pulley.
Make sure the surfaces feel smooth to your finger as you slide it over
the entire surface that the belt travels.
Tighten the belt some by loosening the motor screwsand pulling the
motor away from the flywheel. It should be to the point that it is
hard to get the belt to slip if you turn the flywheel and try to
hold the motor pulley. Don't over tighten or you will be looking for
a new belt.
Also, I recommend maually spinning the disk in the jacket a few
turns. the surfaces tend to be sticky when they sit for a long time.
Just my thoughts.

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