SE/30 logic board large capacitors

[beachycove]

The SE/30 has, among other capacitors, two radials rated 220µF (16V) at C11, and 470µF (16V) at C2.

Can anyone tell me what they are for?

 

[beachycove]

I ask because I have recapped all but these two, and my floppy drive does not appear to be getting power. I’ve tried a couple of drives and two cables....

Just trying to figure out what to do next.

 

[beachycove]

Sorry, tried another: The third floppy worked, so the first two were dead. That was an unwelcome fluke.

All the same, what do C2 and C11 do?

 

[SuperSVGA]

C2 is Audio Power Filter, C11 is +5V Supply Filter