24 Nov
2008
24 Nov
'08
9:23 a.m.
Date: Mon, 24 Nov 2008 10:26:31 -0500
From: robo58 at optonline.net
To: cctech at classiccmp.org
CC:
Subject: Help with Shugart SA801 8" floppy with 230v 50 cycle motor...
This weekend I was trying to get an old CPM system running with via its 8"
floppy disks. After troubleshooting it I found that the disk drive cabinet
contained a Shugart SA801 Drive with a 230v 50/60 cycle Reaction Motor
(capacitor start).
I scoped out the index pulse to verify and it was running about 1.2x faster
than it should (420 rpm versus the expected 360 rpm).
Is there anything I can do to get this drive operational other than to sell
it another who has a 230v/50 cycle environment.
Thanks Robo
Hi
In my earlier days, a friend had just the same problem.
We took a file to the pully on motor shaft.
We just turned it with the motor running.
We did have to elongate the mounting holes on the
frame. I suspect the the 50/60 cycle change had
a different flywheel and pully or belt.
Don't think of tape or something on the flywheel.
The disk read is very sensitive to the slightest
roughness on the surface of the flywheel.
On old machines that I get, there is often
tarnish and oxide on the flywheel. I usually clean
and polish this before I expect the drive to work properly.
The friend did use the SA800 for several years until
he moved on to a PC.
Dwight
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