Fixing the floppy drive of a Macintosh SE without dying

victor.muc

New Tinkerer
Dec 17, 2025
2
1
3
Hey everyone,

I’ve repaired a lot of Apple hardware over the years (PowerBooks, iBooks, iMacs, Intel Macs, etc.). Over the last couple of months I’ve been doing at least one repair per week, even if it’s just something minor, so I’m usually not afraid of taking things apart.

That said, I’ve now run into my personal CRT fear.

I recently picked up a Macintosh SE with a failing floppy drive. The drive initially worked: it accepted a disk and I was able to eject it twice. On the third eject attempt however the disk got stuck while the eject motor kept spinning continuously. I had to use a paperclip to remove the disk, and since then the eject mechanism seems to run nonstop.

I’d like to open the SE and remove the floppy drive so I can clean and repair the mechanism (my replacement gears arrived today). However, the CRT and high voltage area make me a bit nervous. I’ve watched several teardown videos and I know where the dangerous parts are (flyback, anode cap, rear of the CRT, analog board), but I want to be 100% sure before proceeding.

Is it safe to open the SE and remove only the floppy drive if I stay on the left side and avoid touching the CRT, flyback, and analog board entirely?

I do not plan to go anywhere near the CRT or the analog board.

As far as I understand, discharging the CRT shouldn’t be necessary unless I actually need to work near it. The SE has been unplugged for about two months, so unless the bleeder resistor has failed, it should already be discharged. I’m also hesitant to discharge the CRT myself, so I’d appreciate confirmation on whether this is sufficient.

Is this approach completely safe, or is there anything specific I should still be careful about?

Any advice or reassurance from people who have done this before would be greatly appreciated.

Thanks in advance!
 

GreenBar0n

New Tinkerer
Dec 22, 2025
50
16
8
East Bay Area, CA
You'll be fine, you sound cautious and that's enough to keep you above ground :).

Pretty sure the discharge procedure of the CRT is covered in the first video, if not the Analog Board recap video is a good one to watch too.

800K floppy recap:

Eject gear replacement:

Analog board recao:
 
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victor.muc

New Tinkerer
Dec 17, 2025
2
1
3
You'll be fine, you sound cautious and that's enough to keep you above ground :).

Pretty sure the discharge procedure of the CRT is covered in the first video, if not the Analog Board recap video is a good one to watch too.

800K floppy recap:

Eject gear replacement:

Analog board recao:
Thank you so much! I definitely will be cautious.
 
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Paolo B

Tinkerer
Nov 27, 2021
304
183
43
Switzerland
At a certain point, you will have to remount the drive and confirm the repair. If something fails, then I guess you don’t want to wait two months…
So, IMHO:
1) if you have the skills for doing small (or relevant) repair jobs on your Mac’s, you definitely have the skills for discharging the CRT
2) the procedure is easy, well documented and safe, I would definitely recommend that you get familiar with it
3) the SE should have a bleeding fly back transformer (for redundancy only: as safety always comes first, do not take shortcuts)
 
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