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You sure seem to know what you're talking about. It's a good thing to have an expert right here in the forum. According to Larry Pina's book "The Dead Mac Scrolls", the track 0 sensor should be properly aligned, too. Otherwise, the drive won't be able to format disks. It's indeed quite easy to...

When you own another Mac SE you could try to compare the resistance of each FDD connector pin to the ground between the good and the faulty boards. If you multimeter has a diode test mode: red probe on ground, black probe on each pin of the FDD connector joints. Otherwise, test in resistance...

What happens when you tell the Finder to format the disk? Does the formatting work?

Would you kindly describe (again) as detailed as possible what happens when you insert a disk in the internal drive?

After some investigation, I was able to collect some information on the track 0 sensor of the MPF75W drive: In my drive, it is an Omron optocoupler, probably a custom one because it has a non-standard, fairy long bracket for mounting onto the drive chassis. It has three wires: the brown wire...

Thank you very much for all your great advices! They helped a lot! That's exactly that what I'm going to do next. Although I suspect a failure of an electronic component I'd like to get sure that the mechanical part is good. There are three motors actually: one for ejecting the floppy one...

Removing this unit will cause alignment issues. You'd have to recalibrate the mechanics. Anyway, we have to test the sensor in order to ensure it works as expected. Give me some time for investigation...

Yes, it's one of the very early 6100, 60 MHz, from the beginning of 1994. Nothing. As I said earlier, this drive was in the working condition two months ago. There is a high probability that the electrolytic caps installed in this device, namely high-quality japanese capacitors by Nippon...

I checked the stepping motor. It's a bipolar Minebea 08BJ-H031-41 with 4 wires. Each of the two windings has a resistance of approx. 90 Ohms. I was able to drive the motor away from the zero track sensor by alternately attaching a 9V battery to the windings and switching the polarity. After...

Please find the picture of the front cover attached. The floppy drive slot is to the right, right above the power button.

Sorry for overlooking the difference between "inject" and "eject". The emergency eject hole is located to the right of the drive.

My PM 6100 has an auto-eject one. It's Sony MFD-75W-012G, known as Superdrive. See the attached picture. Moreover, it doesn't reveal any mechanical problem. It has simply stopped working...

Yes, I did. The head doesn't even move abit. Is there any easy-to-do test to ensure that the floppy disk controller (SWIM III) is operational? Anyway, I'll try to clean and to re-grease as you suggested. I suspect a failure of an electronic component, not sure which one...

Be careful when touching/cleaning this part!

To my understanding, the track 0 sensor is a small PCB containing the so-called optical interrupter. It's marked with a red lasso in the attached picture.

Good question. I have to take look into my drive...

Thank you, I'll check it out. Booting from HDD works but the OS doesn't recognize any disk in the floppy drive...

"FMD" is surely a typo. It should be "MFD".

My Superdrive has both Apple and Sony part numbers on the disk motor: MFD-75W-01G MP-F75W-12G No clue which one belongs to Apple and which one to Sony.

Well, I have a (probably broken) Sony MFD-75W-1G as well, see this thread: https://68kmla.org/forums/index.php?/topic/30963-sony-superdrive-stopped-working/ Let's join our efforts and see what we can do. If the head stepping motor keeps running, there could be an issue with the zero-track...