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I will replace DP3 and DP4, those get leaky with the years, they are ok when tested but they are cheap enough not to change as a matter of fact. The 5 volt rail is a reference for other voltages, so if you are trying to tweak the 5 volt line, the 12 volt will increase heavily. Keep in mind...

Probably won't work properly without new capos around and the Egret removed, cleaned and put back together (lot of contamination underside)

Same here, but having also troubles hearings some other sounds as well :(

I agree a 100% with builder68, I will replace caps first, not so delicate though, and will probably solve your issue

Probably one trace bad from UE8, but I agree with Byrd, will remove the chip, but will replace it as a matter of fact.

Yes i don’t see why it won’t be. The best option is to remove this capacitor and to solder a tantalum instead, smaller and better suited.

Just below the pad.

Using a telephone cable won't fry anything... but won't work either. Your issue is located on the cable itself (if you are not using the same on both units) or a bad solder joint in the keyboard itself. the keyboard itself is pretty reliable and easy to fix.

Have you tried removing the daughter ram board ? can be anything, including the processor.

I think the small spring is not the issue, but rather the metal plate also acting as a spring, and the chances to getting it lined up is 50%

The idea is to see if removing the upper carrier, the upper head is touching the lower one. If so, something is preventing both to do so.

Remove the upper carrier, maybe this is preventing the head from touching the disk.

Yes i agree, i think i was able to flash a 9500 without any issue, but not the 9250

Yes, was thinking the same thing, poser supply issue first.

yes i agree, the 400k drive has only once head (the lower one) when the 800k drive has two. So when reading a 800k disk you need both. Yes try cleaning the upper head first, if you don’t get any improvement, move the spring of the upper head a notch down.

IIRC it won't work without the right display

If the click is registered, maybe just a bad trace, the chip is probably OK

can be the optoisolator

Hi, hard to say concerning the board, can be the Egret chip. I don’t know for sure, but maybe spotted some bad traces, one seem broken.

Yes, broken peg. was probabaly broken at some point when the drive was stuck and someone tried to remove the disk using brute force.