micropolis 1355

From: Kevin McQuiggin <mcquiggi_at_sfu.ca>
Date: Fri Jan 15 17:01:36 1999

Hi Emanual:

Another common problem that causes these symptoms is a spindle brake that
does not retract fully. This is easily fixable. Just remove the large
circuit board from the underside of the drive, and locate the solenoid
that pulls the spindle brake back whenever the drive is powered. It's a
cylinder about 1/2" by 1.5" long. Note that when you power up the drive
the solenoid pulls the little brake lever back out of the way of the
spindle. Likely it doesn't pull it back far enough in your case! This
causes the brake to never disengage, the spindle can't get up to a
constant speed, and this cuases the drive to spin down and reset. Then the
same thing happens.

So, loosen the little set screw that holds the solenoid in place and slide
it back about a millimeter, so that the brake doesn't contact the spindle
when the drive is powered up. Tighten the screw, replace the large circuit
board, and you're in business.

I've fixed two sick RD53s this way, both still run fine a couple of years

Let me know how it works out,


Kevin McQuiggin VE7ZD
Received on Fri Jan 15 1999 - 17:01:36 GMT

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