22 Dec
2020
22 Dec
'20
12:01 a.m.
On Mon, 21 Dec 2020, Aaron Jackson wrote:
The status currently is that the heads will load, and
the ready lamp
flashes as the heads wobble back and forth very slightly, trying to lock
onto the outer servo guard band. Probing TP2 of the read/write module, I
can see the S1 servo burst flash (roughly in time with the ready
lamp). If I disconnect power to the servo motor, I can manually move the
head onto the outer guard band (less than a mm away) and monitoring the
position signal (TP15 on the drive logic module) shows this to be close
to 0. So, I'm very confused.
I've had almost the identical problem with a RL02 drive from a friend. It
would start and load the heads, but the ready light would flicker or not
even come on. After a measuring session I discovered that if I manually
select the other head, everything would be fine. And if I disabled the
servo motor I could manually lock onto the track on side 0, but then side
1 was out of alignment. So the alignment between the two heads was wrong
and I had then aligned one of the heads so that the two would lock onto
their corresponding track. The drive works fine since then.
Christian