Purity rings on Tron wg4900

jonathan1138

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Hi, restoring a Tron. I took the monitor out to prepare the cab for painting. Cleaned the monitor and notice the glue on the purity rings (brown rings in between the yoke and neck) spin freely. I lined it up to the crusted glue mark, but I don't think it's matched like it was (it's not)

So, of course when I get the game back up I am sure I will need to adjust this a lot, from reading other posts. What does this control? Color drive? What does each arm or band control - a certain color per each band?

Is adjustment really as tough as most explain on searches?

Thanks....
 
Thanks for the link Slots. Looks like i will have my work cut out for me here. Will print this out and learn it for now. Plan to be done with the resto in about a month, so thats when the real fun begins!
 
Just remember, when converging a monitor, degauss first, then set purity, then converge. The rings closest to the screen set the purity, the other ones affect the convergence. This is where a newer Jamma game with test patterns in test mode is really useful - so you can easily change to displaying solid color screens and crosshatch patterns. When setting purity you want solid color screens.

Another thing to watch out for is that the position of the stack of rings on the neck also affects the convergence. If you can line them all up with the original mark or glue line, try sliding them back and forth as well. You might get lucky and find a spot where it all looks right.

For reference, color purity means that the color guns hit only their own color phosphors and none of the others. So, a the red gun hits only the red phosphors, and displaying a solid red screen doesn't have any funny blotches of other colors in it, etc.

Convergence means the adjustment of the color guns so they're lined up with each other - so a white line is white, and not a bunch of colored lines near each other.

The Wells Gardner manual referenced above is a great guide to convergence - it's just helpful to know a bit of background first.

-Ian
 
When adjusting those rings - can use my bare hand (right hand / left hand in pocket)? Any risk of shock while just touching those rings?

I of course plan to stay far away from cup / chasis / neckboard when adjusting (for those, if i need to spin a pot, i use Plastic adjustment tools).
 
Yeah, you can adjust the rings with your bare hands. They're plastic, and the neck of the tube is uncoated glass.

Just don't touch the anode cap, or any of the metal points on the back of the neckboard.

When adjusting pots, you can adjust the ones with plastic knobs with your bare hands. The metal wafer ones on G07's you should use a tool for, however.

-Ian
 
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