Center convergence is way off.
Do this to rough it in.
Dark room, color all the way DOWN. Brite & contrast about 2/3.
Dot pattern, Adjust the 3 conv magnets & 1 blue lateral ( not the rings)
to bring the dots together in the center ONLY.
The edges will fall into place much better then.
After you do this a few times & it "clicks" you wont need a generator,
you can do it by eye quicker.
The set probably needs a by the book set-up but this will get you
to the point to trouble shoot any other problems.
73 Zeno
LFOD !