> On Jul 24, 2017, at 2:31 PM, Fritz Mueller via cctalk <cctalk@classiccmp.org>
> wrote:
>
> Thanks for the advice, per usual, folks!
>
> To answer the question of "where hard to see", I guess it's really an issue
> of my old-man-eyes at this point. I find I need to use a jeweler's headset,
> or even bench microscope, to really see anything small in detail these days.
> It's hard to do that with heads in the drive -- I just can't get my head in
> there that close around all the fan, cartridge carriage, etc. And seeing
> what's going on while trying to clean the top head with a mirror is pretty
> frustrating. Perhaps it is time to find/train a younger apprentice :-)
>
> I do have an alignment pack. In looks to be in good shape. I have not
> mounted it yet; after restoring the drives I figured if the heads were going
> to crash I would let that happen on less valuable media. But to my pleasant
> surprise the heads flew (more or less) and I've been able to read packs
> reliably on the drive (including a DEC manufactured RKDP) without attempting
> a head alignment. I did do the servo setup, but even all that was already
> very close to spot on.
That means the new head is close to the old head position. Servo setup doesn't
have anything to do with it -- RK05 doesn't have a servo that pays attention to
the bits on the disk. That's different from later disk types that have a servo
surface (such as RP04) or embedded servo (current technology).
paul
