PS/2 Model 25 repair info?

I've not actually verified that voltage is present (I don't own any PS/2 stuff), nor have I checked it's sued on the floppy drive (I do have one of the drives somewhere, I think). I was given the Hardware Interface Techref by a friend who had no further use for it, and who knows I collect techncial manauls. As is well-knwon, this manual doesn't contain schematics, or ROM source listings, or anything that makes the old IBM PC family TechRefs really interesting, but of course I thanked said friend for the manual and added to the shelf. The pinout I typed in last night was from a section on the floppy drive/controller subsystem. It's not Model 25 (or any other Model) specific. It's quite possible some machines don't provide +12V there, if none of the supported options for that connector would have needed it. -tony