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Tim:
Try it on either channel 3 or channel 4, it should produce a pattern on one or the other. Set it to color bars first. Sometimes the dot pattern does not show up if the fine tuning is a little off. If that doesn't work you may have to open up the generator and test tubes in it. To take it apart you will need to remove the two screws on the bottom of the front bezel and gently pry it off. Once that is off there are about 14 screws to take off the front panel. I think that RCA wanted to make sure that the front panel never suddenly flew off during operation! You may be able to access the tubes by removing a panel on the back of the unit but I usually recap these units anyway.
I think that Andy was correct about the convergence. Using a broadcast or if you have cable, tune to a local access program that shows a community calendar (lettering), turn off the color and adjust the blue lateral magnet on the neck of the CRT until the blue edges disappear near the center of the picture. That should fix a lot of your convergence problems.
Steve
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