It's a CRT rear projector. The only user-adjustable convergence feature is the "Magic Focus" button. You press the button and it cycles through its own test patterns and does its own thing. The pictures you're seeing are after having run that cycle. Anything else requires pulling things apart to get to the internal dials and such.

If you look at the red and green guns, those are clearly within range of what adjustements could be expected to fix. The blue gun, however, is deeply broken. I don't see how it's salvageable, but I'd love to be proven wrong.