Re: 1541 bad R/W head

From: Francesco Messineo <francesco.messineo_at_gmail.com>
Date: Sun, 25 Feb 2018 20:31:39 +0100
Message-ID: <CAESs-_wiKKf7j1ApB3GddDobij9P46rrsnYGDgoex6x_ju9mbA@mail.gmail.com>
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

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Received on 2018-02-25 21:03:10

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