RD53 Restoration - test-drb@ccmp.vtda.org

19 May 2010

...
  Could that be because the new boards are a different
rev and perhaps expect 
It's always possible. This is one reason why I really dislike 
board-swapping. It is much easier to repair a configuration that has 
worked once than one you don't know if it should work.

I wonder if this drive depends on reading something from the platter as 
ssonas the motor is up to speed (say a servo pattern). if so, then if the 
heads are moved to far in or out , it may fail

Did this drive suffer from the well-known 'sticky bumper' problem? If so, 
what have you done about it? Is it possible that if you just removed the 
old bumper that the heads are outside the servo area sometimes?

...
  something different? The other thing I have just
remembered is that the new
 boards are missing the graphite pad under the spindle, but then again I have
 run the original boards successfully with the bottom board lifted up so I
 can probe voltages, so not sure that would have any effect. 
That should have no effect at all.

-tony