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I guess that means R4, which is also labeled Horiz. Lin. Control on that schematic. From the video it seems it does effect the linearity in some fashion.
To bad the SAMS does not show waveforms in that area.
There are many RC combinations in that schematic so it would be a little hard to know where would be good places to look at the waveforms in order to match what is normally seen.
I wonder if there is a special order to adjusting the H. Lin. since there are at least two controls that effect it. They might interact.
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