If you have an adjustable height instructor's classroom desk at the front of the room that will not move up or down, displaying "LOC" signifying that the controls are locked, here is how to unlock it:
- Locate the control panel near the right side of the desk hanging just under the desk surface.
- Find the "M" button, "Memory". It should be the lower-right button.
- Press and hold the "M" button in for 8-10 seconds and the "LOC" on the display should go away and the up/down arrow buttons should move the desk again.
As far as I am aware there should be no reason for these to be locked. It usually happens when someone accidentally leans against it or a chair gets pushed up to it inadvertently holding in the button.