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The chroma button on the TV doesn't turn chroma off. It swaps the user brightness, contrast, color and hue pots, for a second hidden set of pots and sets the auto color circuit in the demodulator....The basic idea was for dummy and for people with kids who like to mess with the user picture pots you can just push a button and get back to a normal picture. The presets are usually hidden inside the pot shafts and can be adjusted by pulling the user knob and sticking a long skinny flathead screwdriver down the hollow shaft.
You want to adjust the RG static magnets so the colors overlap at the center like you say. Normally you do RG then converge B over them. I've heard of people moving the blue away but in practice there's often enough interaction that RG needs touched up if you do. What I do is have blue close unplug the cathode wire to kill blue (turning down G2, or using a 100K resistor to mute a gun are also options) convergence RF then turn blue back on and converge it with RG.
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