> On 2018-02-25, at 20:31, Francesco Messineo <francesco.messineo@gmail.com> wrote: > >> You may try to replace the head. Is this the "turn" or "push" type of mech? I think I have somewhere an incomplete "push" mech, which should have a working head. > > it's the turn one. The newtronics D500, is the most widely used in the > 1541-II, but was used in many 1541s. > I think replacing the head would require a re-alignment of the stepper > too, which is something I can do, but I would rather avoid unless this > happens to be the last disk drive on earth :) It's not /that/ hard. I did it a few times on 5.25 and a lot of times on 3.5" where people notoriously used to tear the heads out or otherwise, mechanically damage it. >> Happens. Rarely but happens. To other types of tightly wound coils too. > > it's my first encounter with this failure, that's why I wondered. I ran a workshop back in the times and had much bigger sample, I guess. Literally hundreds (if not four figure numbers) of those passed through it. I remember this type of failure twice, I reckon. So yes - it is a very rare failure. A fraction of a percent. > Who > messed with this drive before me, managed to install a 74LS00 in place > of one of the 7406. It rended completely inoperative both the activity > led and the head stepper, but fortunately didn't ruin the custom > logic array. > I wondered if maybe the same person could have killed the head too... Could be. Who knows what (s)he was thinking and connecting (where to). -- SD! - http://e4aws.silverdr.com/ Message was sent through the cbm-hackers mailing listReceived on 2018-02-25 22:00:02
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