I have an old uniden system and just dusted everything off to start getting ready for all of the wild feeds for college football. I moved the dish into a trellis that must have jammed the dish. An "L" flashed on the receiver. Now I can no longer move past that point even though I have removed the trellis. It seems th receiver has locked me out of moving any further in the one direction. The didh can move in both directions, but will not move past the one spot. Any idea how to unlock?