Techtronix 5110

[TerryCtjc]

I have a Techtronix Oscilloscope Model 5110 The display is restricted to the top right hand quarter of the screen and cannot be moved by the position controls to any other area of screen. When try to move display to bottom of screen trace stays at center and magnitude of waveform decreases. Any help or advice as where to look for problem would be most helpful.
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[perdrix]

Don't post the same question on more than one forum.

[TerryCtjc]

OK new this but will learn quickly.