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I've got one of these RCA pattern generators...have modulation but there is no pattern. Maybe needs caps replaced...I've not torn into it. I saw a portion of the schematic...anyway someone could post the whole thing, maybe in the picture gallery?
The round sets are easier to get good covergence on, just using the lettering from a community calendar or DVD menu, than the rectangular sets. Somehow the round sets are more forgiving with the adjustments. Like Steve said I would start with the blue lateral and the 3 center convergence red/green/blue magnets, often they can snap it back into good convergence.
Also make sure the purity/degaussing, vertical height/vertical linearity/vertical centering and the horizontal centering are set up to produce the best purity and best proportioned picture on the screen...all of these settings, if off, can aggravate misconvergence.
Also do not do any of the convergence/purity/degaussing in a remote location, do it only in the set's final position. If you can't get behind the set in its final location, move the set out in a straight line only. The round sets, especially those without built-in degaussing, are very sensitive to changes in the earth's magnetic field caused by moving the set...even turning the set side to side can cause purity problems.
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