checked my 3 X0 players Yesterday and I do get an U1 error on my only MUSE disc
I have , the Sony Test disc,

went through the Error code thread.

could also a reason for the disc not spinning up be that the disc has a slightly bigger inner
hole so it slips or doesn't have the right tighness to spin it up?

none of the players have any problems with the NTSC discs

My advice is to avoid MUSE discs.

Must be disc related if you have it on all of you players, try to get other MUSE disc I would say

only have that one. the most expensive disc I ever bought

https://www.highdefdigest.com/blog/laserdisc-player-in-4k-home-theater/

This fellow had a issue with his which seemed to be resolved by playing a CAV disc, worth a shot

thanks for the tip.

tested all three players with CAV NTSC discs and CAA (CLV) and all worked, just can't
get the MUSE test disc to spin up on all players.

Likely the disc?
Why 3 x X0's?

they all were very cheap to get. HK$11000 back in '05 (USED of course)

nobody wanted them, HD was the new great thing.

and one thing LD is still good for , Music Video Clips (some of which using NTSC video and film in the same clip) won't look much better even using AI upscale