Fixing RK05 servo chatter

From: Richard A. Cini, Jr. <rcini_at_msn.com>
Date: Sat Jan 2 20:18:28 1999

Hello, all:

    I decided to play with my 11/34a over the holiday, and discovered that
one of my heretofore working RK05 drives has developed a chatter in the
linear positioner. Here's what happens: the drive goes OnCyl with no
problem, but on the first acccess, the OnCyl light blinks, and I get a
device error returned to RT-11.

    I opened the case and watched the servo during this process and it seems
to move in and out by one cylinder during this condition. So, I figured that
there may be dirt on the positioner optics. I used compressed air to blow it
off, which had no effect.

    Any clues?

[ Rich Cini/WUGNET
[ ClubWin!/CW7
[ MCP Windows 95/Windows Networking
[ Collector of "classic" computers
[ http://highgate.comm.sfu.ca/~rcini/classiccmp/
[ http://highgate.comm.sfu.ca/~rcini/pdp11/
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Received on Sat Jan 02 1999 - 20:18:28 GMT

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