The plot thickens....
1) I took tony's suggestion and disconnected the AC on both RX02 spindle
motors from the back. The problem still occurs so it's not the RX02 spindle
motors.
2) I extended the RX02 on the rails and looked underneath. There is a metal
plate bolted under each drive. I believe it's steel, it's that burnished
"gold" colored metal. There is a separate flat plate under each drive, and
the plate L's up the side about 3/4 of an inch. I believe this is properly
closed.
3) I put that steel plate between the RL02 and RX02 again and sure enough
the problem disappears. This time I tried moving the plate around to
localize exactly what on the RL02 must be covered to keep the problem from
occuring. This may be telltale. The portion of the drive that needs to be
covered by the metal plate to keep the problem from occuring is the top back
cover of the RL02. This is the plastic section that is about 8 inches deep
front to back, and is exactly over the drive logic board. Interesting that
this would mean the plate isn't covering the heads. Also interesting - based
on the depth difference between the RX02 and RL02, no part of the RX02
extends over that part of the RL02 EXCEPT the black "wedge" fan housing and
fan on the back.
4) I believe that there is supposed to be some type of cover over the top of
the RX02. I do not have this cover. I have what I was TOLD is the top cover
of the RX02, but there's no way it could possibly fit over the top. I know
that a rackmounted RX02 doesn't have a nice finished metal cover, but I do
think there is some type of metal cover that is supposed to be on top. I
wouldn't have thought this to be so germane to the problem, because the
problem is definitely "down and to the rear" from the RX02.
5) The problem with the right drive - I forgot to check this closely, but I
am fairly sure that drive spins. But if you put a boot disk in it (that
works fine in the left drive) the heads will drop and lift over and over
with about 2 or 3 seconds between each drop/lift cycle. It'll do this till I
halt the processor.
Maybe all the above will trigger a course of action in the brain of someone
smarter than me :)
Jay