Calibration of 8" floppy drive?
elson at pico-systems.com
Fri Feb 5 21:52:59 CST 2016
On 02/05/2016 08:02 PM, Dan K wrote:
> Another great tip. This plagued me for a long time, until
> I realized that I had only one drive connected, and it had
> the resistor network IC unpopulated. I borrowed it from
> the other drive (they were on the same wire, so I suppose
> that only one resistor network is necessary) and that's
> what led to my initial success.
Yes, the terminating resistor pack should only be in the
last drive on the cable.
> It seems to do the job, but I still don't have a
> replacement pad. That seems to be okay however, because on
> one drive the head load solenoid doesn't appear to come
> down far enough to push the disk very much. I don't think
> I've ever seen the pad on either drive come down enough to
> physically touch the disk--maybe just brushing it, barely.
> What might cause this?
Probably wear, or maybe warpage of the parts over time. The
pressure pad should be fairly soft, usually a felt-like
material. It needs to push the media into contact with the
read-write head. Without it, you will occasionally get good
enough contact to read a sector header or even a whole
sector, but it won't be consistent. The data will come and
go as the disk rotates.
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