Monitor (CRT) Yoke Adjustment

I would like to know how do you adjust the CRT Yoke on a Power Macintosh 5620/120, and if there is any software to aid in this adjustment.  
n_salvatoreAsked:
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weedCommented:
Yoke?...you mean the tilt and general geometry? In the monitors control panel theres a tab to set geometry.
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n_salvatoreAuthor Commented:
The settings I am asking about are not a control panel setting for the geometry.  The settings I am asking about are made at the end of the CRT Tube, by turning the rings and adjusting the R,G,B guns on the inside of the CRT.
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mazurCommented:
Like all color CRT's, you can use the "purity rings" to control the beam landings. Display a solid red background and then adjust the rings for the purest color. Then check with green and blue screens as well.
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n_salvatoreAuthor Commented:
Thanks for your help.  I would like to know how I would display a solid color.  Do I use any software or use desktop colors for the solid screens.
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mazurCommented:
Whatever you can use to generate a flat color accross the screen. Just make sure that you pick pure colors, e.g. red = 100  0 0 (%RGB values).
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