Simply put: I know that Classic Rev, A and Rev. B boards are not compatible with the two different earlier and later style CRTs. The Classic II I picked up is a later model that has a B board. I figured only the connector was different. Turns out that is not the case: about four capacitors are of different values, and some of those are not even the same listed number. For instance, CL1 on a Rev. A board is 10 µf, 50 V, whereas on the Rev. B it is 1000 µf, 25 V. Big difference, not just beefier component. CP31 from a Rev. A...doesn't even exist on a Rev. B. These are just two examples. I had no idea they were that different.
As an aside question, those film capacitors, CL6 and I believe CL7...anyone know their values? I get no hits from the writing on them and am not sure if they need to be replaced (my ESR meter is useless if I don't know what the ideal value is).
Your 400k disk probably lacks boot blocks. To write boot blocks to it, you need to copy the System file from a bootable disk onto that disk. I’m not sure if System 7.1 will do that for a 400k disk (it may .... I’m just not sure). However, you can almost certainly start your SE/30 with a System 6 boot floppy, copy a System file onto your 400k disk, then boot into your System 7.1 HD and copy all the files you want over. Your 400k disk should then boot fine (not on the SE/30, obviously....).
Nice treatment from dog_cow here: https://macgui.com/news/article.php?t=463
I have an original 400k Write/Paint Guided Tour disk. I ended up formatting it after copying its contents to me SE/30's hard drive to test a 400k drive I just received. The disk reads, writes just fine but once I copied the original contents back to the drive it will no longer boot. Yes, I formatted it as single sided.
Does the original system suitcase need to be blessed? How does one go about that on a system 7.1 machine?