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Tim,
If you have a 1V or more composite video source, you can feed video directly to the grid of the 1st vidoe amp (remove 56h IF amp). If you still have noisy video, it is simple to signal trace through to the CRT grids to isolate the porblem. Is the noise only in the Y channel, or is it only in the color portion of the signal? And if the noise clears up when you inject a signal, then as suggested by Steve D., I would try cleaning the tuner before any alignment is attempted. You might also check to ensure the AGC is operating properly.
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John Folsom
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