On Sun, Feb 25, 2018 at 8:22 PM, <silverdr@wfmh.org.pl> wrote: > >> On 2018-02-25, at 18:56, Francesco Messineo <francesco.messineo@gmail.com> wrote: >> >> I've fixed a couple of 1541 today. Well, actually one can't be fixed >> because the R/W head measured 15.4 kohms instead of the usual 32 ohms. >> So it seems it isn't the little cable interrupted too. >> I guess the only option is finding a new Mitsumi/Newtronics D500 >> mechanic and substitute it. Or does anyone know a better solution? > > 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 :) If it were mine, I would probably use it for parts. > >> Any idea why a R/W head dies? > > 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. 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... Frank Message was sent through the cbm-hackers mailing listReceived on 2018-02-25 21:03:10
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