Have just bought this machine and powered up. LCD is a bit unclear but can follow. I can run spindle, speed adjustment, jog x, jog y (with rotary knob and + and - buttons) but when trying to adjust z, the same way as x or y the error light comes on and the lcd says something about limit, I have removed the front cover on the head and manually rotated the belt to come of the limit switch (rotates freely) with the same result. I checked all switched for the quill with a ohm meter and all seem correct. What am I doing wrong.

I believe it must be my ignorance as it took me over a hour to find out that I was able to jog the table but just did not notice the movement as the feed rate was so small.