On Sunday, December 1, 2019 at 12:00:21 PM UTC-5, Cursitor Doom wrote:
The medium voltages are not so close to what
those printed on the PCB state they should be, however.

Over the years, I've seen voltages printed on PCs that were incorrect for the version of board as loaded. IOW, manufacturers will often make running changes to a product design and revise parts loaded on the board and even use a different transformer to feed it. Since they have may have boards already screened, they're not going to scrap them out.

If HP has archived schematics, they may have a revised schematic that more closely or even exactly matches the voltages you're encountering.