Re: Apple II "Exerciser" Board

[mjmahon@aol.com (Michael J. Mahon)]

Steve wrote:

>On Fri, 20 Jun 2003 13:33:48 -0400, Michael J. Mahon wrote
>(in message <20030620133348.08084.00000736@mb-m16.aol.com>):
>
>> There is really only one track alignment adjustment on a single-sided
>> 5.25" drive:  the head positioner.  If the head position is correct for any
>> track, then it will be similarly correct for all other tracks (within the
>> design tolerances of the drive).
>
>Isn't that what you adjust to read some copy-protected disks? I't been a long
>
>time, but I seem to remember fiddling with the alignment to read those 
>things... I even have a couple of programs that I forget the name of that 
>walk you through the adjustments.

I believe you are thinking of the drive speed adjustment trimpot.

The head positioner adjustment on most drives requires loosening
a couple of screws holding the head positioning motor and manually
rotating it slightly before re-tightening the screws.  In my experience,
this adjustment is only rarely a problem, caused usually by a hard
shock to the drive (dropping it) or otherwise doing something physical
to distort the head positioning mechanism.

-michael

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