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. FrankReceived on 2025-02-12 15:00:32
Archive generated by hypermail 2.4.0.