11/45 RL02 faults when RX02 is on

[Jay West]

Ok, is there a known severe RFI problem with mounting a RX02 directly on top 
of a RL02 in an H960???

I went back to look at the "RL02 faults when RX02 is on" problem. I had left 
the rear top cover of the RL02 up in the service position (with the drive 
extended from the rack). I retested without touching anything. Sure enough, 
the problem was "gone". The RL02 wouldn't fault no matter what. So I put 
that rear top cover back down and screwed in the 4 screws, then pushed the 
RL02 back into the rack and voila - the problem reoccured. The RL02 will 
fault just after spinup IF the RX02 (which is mounted directly above it) is 
powered on. Aha... I was now thinking a cable problem! I figured pushing the 
RL02 in and out of the rack seemed to be the causative factor, bending a 
cable just right or something.

So I pulled the RL02 fully out front on the rails, and the problem went away 
(with the RX02 turned on just above it, but back in the rack). So with this 
configuration I figured that the problem occured when I pushed the RL02 back 
into the rack as it must jiggle some cables. I decided to try THIS...

I extend the RL02 out the front and power up everything, including the RX02. 
The RL02 spins up just fine, no fault. Once it is ready... I start pushing 
the RL02 back in the rack, very slowly. After going back about 7 or 8 
inches, the ready light starts to flash. I pull the drive outwards 1/2 inch 
and the ready light stops flashing. Push the RL02 in 1/2 inch and it starts 
flashing again. If I push the RL02 in another 2 or 3 inches after the ready 
light starts flashing, the drive faults. This is not a freak occurance, it 
is completely reproduceable. This makes me think bad cables.

However, if I go and look in back at the cables when the drive is right at 
the point the ready light starts to flash, there are no cables being moved 
even slightly. I can move the RL02 cables and RX02 cables by hand, the drive 
doesn't fault. What is even MORE wierd... if I move the RL02 drive inward 
until the ready light starts to flash, then unplug power to the RX02 (the 
power cable for the RX02 is around the front, so I can unplug it without 
disturbing any cables at all)... the RL02 ready light stops flashing. This 
would make me think it is NOT cables, and it seems to be proxmity of the top 
of the RL02 drive to the bottom of the RX02 drive.

I know everyone probably thinks I'm nuts, but has anyone heard of a reason 
not to mount a RX02 directly over an RL02???

Jay