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How do I adjust the overscan on a Commodore 1702?

\015 How do I adjust the overscan on a Commodore 1702 monitor? I have the service manual, but I've encountered two problems:1. I can adjust the vertical size, but the vertical position will not move up far enough to center the picture. The adjustment pot (R429) is at its full left rotation. I'm guessing that fixing this will depend on whether I need more or less resistance. If more, I could replace the pot with one that has greater max resistance. If less, I have to replace one of the neighboring resistors with a lower-value one (since I've turned the pot down to zero and it isn't enough). Does this sound right?2. I can't find the horizontal-size adjustment coil, which is documented as L503(L522).Any help appreciated.\015

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