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If you do need to service the vertical section, it is located inside the drawer on one of the circut boards. It is the one on the bottom, with the two tubes in it. The small orange plastic cylinders on the board are electrolytic capacitors, and if the vertical problem can't be cured by fiddling with the controls, these are probably what has gone bad. They are very ease to replace, as the small board can be removed from the drawer, by very carefully pushing from behind it (if you can get to it from behind, be careful, as those long silver cans on the other side can store high voltage even after the set is off and unplugged), you should start to feel it pop out. This is another cause of problems on these sets, as the pins on the boards (called modules) might not make good connection to the rest of the set, and can cause problems, though they are usually more major than this, such as no vertical deflection at all (only a thin horizontal line in the center of the screen), or no color.
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