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I agree an x-acto might create micro abrasions.

In my case, I cleaned the shaft and brushes with isopropyl alcohol and qtip. It was enough to clean off the black deposits. In my view the real possible damage is to bend the brushes.

I also experimented with the realignment of the head motor to solve read / write errors. See https://68kmla.org/bb/index.php?threads/fix-mitsubishi-mf355-floppy-drive.50120

I did the same procedure on the same model of motor with good results. In my case it was not working at all initially. The most delicate part in my opinion was the reassembly, specifically and quoting you “easing the brushes out of the way as you thread the shaft through” I have some tips that...

Does MacTest give you a more detailed report, like the range of address that goes bad ? Maybe that could help pinpoint what pins on the bus should be specifically checked. Have you found the schematics of the motherboard? How hard would it be to source the chips you mentioned and replace them?

Is there any diagnostic software tool that could be used in this case ? Something like a memory checker ?

Ensure the sampling rate of your logic analyzer is at least twice the frequency of your bus frequency (see Nyquist-Shannon sampling theorem) Also check the voltage of your logic analyzer is compatible. I also think you should be extra cautious where you connect the GND of the logic analyzer or...

Nice work ! Thank you for your very detailed answer. I'm slowly realizing it's quite a challenge with all the missing parts! Thanks again for listing all the alternatives. Regarding the rgb to VGA adaptator, I know some adapters like this have made for compact Macintosh. I don't how much this...

Problem Solved! I finally decided to go ahead and try realigning the stepper motor. I slightly loosened the screws on the stepper motor, just enough to rotate it by a degree or two clockwise. After that, I restarted the machine with a known good floppy disk to see if the drive could finally...

Hello, Any progress in your project? I'm curious because I would like to do pretty much the same. I was donated the motherboard of a Performa 5200 and its PSU. The motherboard is clean with the ROM and the RAM present. Maybe I will have to recap it. However everything else is missing: no...

Hello everyone, I've recently acquired a Mitsubishi MF355F 3'5 1.44Mb floppy drive, which was in quite a dusty state. According to the previous owner it was previously used in a Performa 5200. Before even testing it, I carefully cleaned it using Q-tips and isopropyl alcohol, then reapplied...