![]() I also did some experiments with 1.2MB newtronics/mitsumi as they are easier to find, and have the needed (short) deep. Others 360Kb/300RPM mechs work, however all the ones I have tried (several panasonics and teac) are too long for the space available. ![]() The best thing would be to find the same mitsumi newtronics mech. If you have access to an old PC you could swap mechs for testing. The XF uses stock 360K floppy mechs of the period. Not sure if this is normal as it's my first XF551.Īt this stage, it's looking like the mech at fault and not the main PCB? It will go off shortly after the D1: prompt appears. and the disk light is on all of the time and spindle motor is spinning. Doing the same with the XF551, it takes about 30-40 secs to get to the D1: prompt with a lot of SIO beeps. Looks like the XF551 is destroying the format on the disk when I try to format it.Īnother thing I noted was that when I connect up the 1050 but don't insert a disk and boot Sparta from my SIDE3 cart, it takes a few seconds to get me to the D1: prompt. Stick it back in the 1050 and I get the 144 ERROR disk is write protected or bad sector error once more. If I then take that disk and put it back in the XF551 and format it, it fails to format. Connect up the 1050 again and the DIR is good. then conencted the XF551 - it won't let me DIR the disk - get a 144 ERROR disk is write protected or bad sector error message. Thanks again everyone for all of the suggestions/help! This is why AtariAge is the best!įormatted a disk on a 1050 (which I know works as I use it and it passes all the diag tests and will load commercial software). I did wonder if I could use any of the 1050 diag tests - thanks for confirming that I can't look at doing what you suggest Doctor_ Do you have instructions on how best to calibrate the track zero sensor? Was there ever a service manual produced for the XF551? there are pulses in between the steps (is that good?) Metered out the other ribbon cable that goes between the 2 PCB's on the mech - okĬhecked the voltages to the mech - 5.02v and 12.01vĬompared the contents of the ROM to one from another user's dump of the same v7.7 OS - okĬhecked the 2 sensors on the mech (one for doisk inserted and the other for the hole on the disk) - both appear to change when a disk is insertedĬhecked the read/write pins on the 1772 when formatting - and those look good too I'm assuming. Metered out both ribbon cables from the mech to the PCB (All good) Removed the solder from both SIO ports and resolderdĬhecked the rest of the PCB for dry joints - none that I can see I did try SIOSET 1 NORMAL but this made no differnce.Ĭleaned the heads with IPA - they look spotlessĬhanged C14 on the mech board as someone suggested elsewhere Might it be the case that the SIO routines in the SIDE3 cart with SpartaDOSx are using Fast SIO? I've tried the SIOSET comand and it does identify drive 1 being (and using) the XF551 settings. Sticking either Bob's fixed OS ROM or the Hyper ROM won't even get the drive to start a format. With the stock OS on the Drive (v7.7) it does all of the above. Trying to do a DIR on any disk gives a 144 error. Using SpartaDOSx from a SIDE3 cart, and formatting a disk (and have tried well over 10 disks now that format fine in a 1050) still goes through the motions of formatting the disk but right at the end when the head moves back to TR0, it will produce an SIO beep on the Atari and give a formatting error. not sure if that's works with the XF551 either. Similarly, using the 1050 track zero test, it seems to work but you get to a point where adjustments are so small that you can never get it to say OK - it will just do the FORWARD/BACKWARD each time with the smallest of movements of the sensor. Using the RPM test from Sparta won't even start. I don't think that the speed measurement from the 1050 diags is correct. Ive tried the 1050 diagnostics RPM test but it reports 3289RPM - and from what I've read, there's no way to change the RPM on an XF551 as it uses a PLL or equivalent to set the speed automatically? There's no pot on the board anywhere. ![]() I have cleaned the heads twice now with 99% IPA.
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