cap ripple disappears with the motherboard load, but switching noise gets worse
~400mv seems like a lot but if it runs it runs, not sure my probing isn't bunk
there's an adjustment for the 5v and R81 says +5V Overcurrent Adjust right on it, and that other pot on the high side regulator card appears to be a high side current limiter
this supply has high side and low side current limiting
let it run for a while, +5v regulation looks pretty good, +12V seems to ride a fixed multiplier off the 5v with even worse ripple and just kinda wanders up and down
they don't seem to have been too worried about it
-12v seems to do its own thing
oh well Quadra goes back on the shelf for now to make room for the next thing until i can find the damn VGA adapter for it...
#retrocomputing #Macintosh #MARCHintosh