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If the chroma osc has a broad lock in adjustment range I typically connect a color bar generator and with the color maxed adjust the fine tuning till the color is barely there (and hold the color osc in sync). The lock point should be smaller but still exist. Then I rock the channel selector and see if it holds sync, and tweak it so that it locks as fast as it can between channels with minimal color signal...If it will lock under those conditions normal viewing signal levels and finetuning position will be a piece of cake for it to lock to.
If it can only lock to strong color there are probably circuit issues or bad alignment problems.
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