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If capacitors are the original ones, you can start replacing all of them.

Concerning the SEs, the SE (without any other label) should be the 800k drive, the other two ones have the 1.44 Mb drive, and were sold under the FDHD (Floppy Drive High Density) or Superdrive name, but they are the same. Ths small monitors can be used for Apple IIs A lot of work here, i will...

Agree a 100%, the drive itself will work fine with the Macintosh, but reading old data from it won’t be straightforward.

I agree, had two bombed SEs and both were repaired with little work.

The most reliable unit ever built…

Probably giving up because the lower bank of memory is required to keep on going. So more chips should be bad.

I will look for a good 5 volt Line all around. Check also for any bad trace

Only adjustments available on the board are Focus and brightnes (flyback transformer), all other ones are done via MacOs software only.

Probably not one or the other.

Can you try to swap chips from the locations found "bad" to other locations to see if the test is relevant or not ?

What do you mean ? always seen the IIc with this external drive. Do you mean any aftermarket unit ?

I used the very same method, but I probably don’t have the same sun exposure.

Nice work, I don’t retrobright anymore. I have some yellowing coming back, and some marble effect also, and plastic looks more fragile after. A very nice setup.

Problem solved, I think the issue was due to the video output of the IIc, the image is great with my Apple IIe.

resistor network 10k Ohm 62 and 470 ohm to me (5 pin variant) https://tinkerdifferent.com/threads/apple-iic-mouse-compatibility-some-details-schematics-and-a-chip-swap-to-fix-compatibility.3828

Yes drive mecanism is the same (or really close, but i have worked only a couple of time in an Apple III, but sure i had and issue with a drive and used a Disk II mecanism) IIRC the board should be close enough for chip swapping. Here below is a picture of a III drive, the black and white...

Yes i agree with RetroTheryboy, most are the International type and are clearly stated that way, so a jumper wire and you are done.

To be honest, i have seen far worse, but if you want to be on the safe side, you can rebuild a new one.

The drives are pretty easy to work on, first step is to be sure they are running at the right speed, you can use any App on Iphone or probably Android to do so : https://apps.apple.com/fr/app/strobe-tachometer-rpm-meter/id831460940 After that, some chips can be faulty on the board, but are...

Yes, I will swap external to internal for a test. If your internal is not reading, you can try troubleshooting it. Maybe the speed is bad (299 rpm) or head is bad or dirty. The drives are Apple IIs with a different board so fairly easy to find.