RL02 weirdness

[Aaron Jackson]

Now that I have my RX02 drive working I have started to take a look at
the RL02 drives again. I hooked a scope up to the sector transducer and
sector timing test points, and they look nicely aligned. So I moved on.

Then I hooked up the scope to the TP1, TP2 and the sector timing TP and
compared it to the output in the RL02 tech manual. S1 was fine but S2
was offset in the wrong direction (probably need to see page 3-8 in the
manual to understand). I had a look at where the heads are connected to
at up was connected to down and down was connected to up.

Without understanding the consequences I switched these and loaded a
pack. Unfortunately I heard a horrible sound and I now have a thin black
ring on the bottom side of my platter, which I am very upset about. :( I
unloaded very quickly but I think the damage is done.

Why would the heads be installed this way? and why did it destroy my
platter when they are connected "correctly"?

Does anyone understand what might have happened?

Thanks, and sorry for destroying a pack :(

Aaron.