Hi, all, I bought an analog Tektronix 2336 YA scope off of vendor a few days back. Almost everything appears to be fine with it (i.e. horizontal beam, visible CAL square wave, etc.) as far as I can tell, as this is my first scope. However, when I try adjust the beam vertically on the screen, I can only get it to go about halfway up the screen. Similarly, when I adjust it down past the bottom of the screen, the beam becomes scrambled near the top of the screen. No full Screen only 4 Division (2 Top and 2 Down) ( if I need DC voltage in 1 Volt Division buttom, only show in subdivisions (per Volts) 5 Volts in One Division)