RK05 alignment - without alignment pack?
hachti at hachti.de
Sun Dec 13 18:07:36 CST 2009
>> How does the positioner find track 0?!?
> It's all done with that optical transduce (the glass scale, the lamp, and
> a couple (or is it 3) photodetectors under the carriage). IIRC it moves
> the heads towards the spindle, then as soon as it gets a valid signal
> from that transducer, it locks to it and calls it cylinder 0.
>> Does it use the end of range microswitch and then count? This is a bit
>> unclear to me.
> AFAIK the microswitch is only used to disconnect the emergency-retract
> battery when the heads are fully retracted. It's not part of the
> positioner system, it wouldn't be repeatable enough.
As far as I understand the documentation, the "outer limit" switch *IS* crucial...! Huh... :-(
> Did the drive work properly after re-fitting that glass scale?
But I don't know if this was the problem. Better: if this was ONE of the problemS. But I assume that
I'll run in trouble with the sensors..
>> everything is moving a bit. Last but not least, a PSU regulator failed
>> with great optical effects.
> Which one? I am wondering if you have failed power transsitors on the
> servo amplifier board that are overloading one of the power rails. Ma be
> worth checking.
20V I *think*. I did not have the impression of overload. This happened after about one hour of
operation. After many years... Gave some nice sparks.
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