Yeah, I know this an old set but I need to know how to access to the service menu so I can enable overscan and fix some of the geometry issues before giving it to my younger brother.

Thanks, Brian

Most Zeniths access the service menu by pressing the menu button and holding it down until the menu dissapears then immediately hitting 9,8,7,6,enter. You may need to set factory mode to 1 to get to most of the settings on older sets. I do not recall on yours, as I don't do much zenith work.