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Yes you are right, both parts of the head should not be disassembled. The head has been probably lifted and is not coming back in contact with the disk anymore. On the back of the head, you have a small spring, you can try moving the spring around to clamp it closer, but it's hit or miss.

With a Macintosh SE

Are you sure the drive’s head is not dirty ? Using « olds » disk is not ideal, as many are contaminated, and once the head is dirty, the drive will not be able to read a good disk. Cleaning the head in between is not a bad idea.

If your disk is ejected, probably an issue with the System Software, or the disk itself. how have you created the disk ? you are dealing with a 400k disk drive, so are you using a 800k disk and only one side of it ? you cannot use any 1.44 Mb disk. so in the end you will need a 800k drive to...

I have a wireless mouse, never seen any other before, working great, using two batteries in the receiver side.

On one of your first pictures, near the video connector, i can see dull pins on the 343S0161 chip legs and this one is : 343S0161GazelleVideo clock generator, LC 475/575, Quadra 605 Can you remove the chip, clean underneath and solder it back ? not saying it's your problem here but worth a...

Ni siqiuera se lo que es un cinescopio ? la pantalla ? Si eso es, lo mejor es encontrar un modelo identico o similar, mide 9 pulgadas. no pienso que nadie pueda repararlo

You can try piggybacking a good chip on top of yours, until the test is ok, works well most of the times.

Yes, all those 400k drives have an issue with grease hardening with time, the upper carrier should be removed (four screws) from the drive, the idea is to soften the accumulated grease and to help the carrier to move freely. the most difficult part is a tiny lever at the lower end of the...

Have not found the head yet, but a friend was able to print some couplings.

probably dirty pots… you are pretty close

Yes Ram, or bad contact somewhere. If ram is socketed you can try swapping chips around.

Optoisolator ? To be honest, the CRT swap was not relevant, unless they are broken, they cannot give this kind of problem. The issue with voltages going all other the place are usually related to the Optoisolator, there is no way to troubleshoot this item, but the part is cheap ans socketed.

I think you are ok with those, but probably using schematics to confirm will be the best choice.

Original capacitors for sure, and lot of juice everywhere

I have not found any evidence anywhere, but i can think about serial numbers as the following : first generation M5010 were twin 800k drives or single drive without any hard drives or supplied with the external 20SC hard drives. then the M5011 with internal hard drive and 800k drive, the new...

I have seen another SE for sale, the main rear label says 800k drive, 1 Mb and 20sc hard drive, while the small sticker has a M5011 serial number. Front is just the usual SE label. Don’t know what to think about it, maybe at some point all were 5011, with or without the new drive and Roms ?

Yes, just remove the 800k and fit a 1.4Mb, will work. I have done it with a manual inject also, still have it, a bit tricky to get a disk in, but works and ejects just fine

remove and replace the RIFA as soon as possible.

Concerning cable, this is an easy fix, as a phone cable with a small modification will fit.