I just downloaded, printed and trimmed a strobe disk image and glued it to the back of a fridge magnet. On Wed, Feb 12, 2025 at 8:28 AM Francesco Messineo < francesco.messineo_at_gmail.com> wrote: > On Wed, Feb 12, 2025 at 2:17 PM <groepaz_at_gmx.net> wrote: > > > > Am Mittwoch, 12. Februar 2025, 14:03:34 Mitteleuropäische Normalzeit > schrieb > > Francesco Messineo: > > > Hi all, > > > I've just recapped a Panasonic JU-570-2 with horribly leaking > > > capacitors that ate a few traces on the spindle PCB. Now before > > > assembling back the SDF-1001 I wanted to test and correct the spindle > > > speed if needed. However the drive motor doesn't have the strobo > > > patterns, so an alternate method must be used. Does anyone know if any > > > of the programs on the test/demo disks can help? Images as many of you > > > know are here: > > > https://www.zimmers.net/anonftp/pub/cbm/demodisks/drives/index.html > > > Does anyone know any test point on the spindle PCB? I think pin 6 of > > > the motor controller IC could be a good place to look, but I figured > > > out someone must already know how to do this task. > > > Thanks in advance. > > > Frank IZ8DWF > > > > Perhaps you can adapt one of these programs to the sfd: > > > > https://sourceforge.net/p/vice-emu/code/HEAD/tree/testprogs/drive/rpm/ > > thanks, those could be a good starting point indeed :) > I think the only one that could be suitable is rpm3 (with or without > changing the target track formatted) since the other two need properly > formatted disks that I don't have (yet). > > However (full disclosure), the JU-570 mechanics has the index sensor > and the control board isn't using it, so I can add a little resistor > to Vcc to read the pulses (phototransistor wires are coming to P1 > connector) and use a time interval counter (200 ms is the nominal > pulse interval). I was just hoping there was a faster way. > > Frank > >Received on 2025-02-12 17:00:02
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