RL02 Tracking

Aaron Jackson Aaron.Jackson at nottingham.ac.uk
Tue Dec 22 04:33:56 CST 2020

On 22 December 2020 at 08:01 GMT, Christian Corti via cctalk wrote:

> 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

That's very interesting to know. Thanks! I have already performed the
head alignment and they looked well aligned when switching between the
two heads, but I didn't have any luck getting it to lock onto the first
track with the head select jumper in. I'll mess about with this some
more, it is at least reassuring that someone elses drive has displayed
similar behaviour.


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