Laser has been working fine, but i noticied yeterday the bed wouldnt move up or down sometimes, now it wont move at all. X and y move just fine but i cant adjust the bed. Its making a noise like its trying to move. I noticed home is x0, y0, u10000. Im thinking its a control panel problem since its saying my home is 10000. Help?
That means the U axis was not homed.
That would definitely prevent it from homing. Does it home when you turn the machine on or as part of the autofocus dance?
Most likely, something got jammed in the belt or the vertical leadscrew pulleys:
If it’s not visible, turn the power off and drag the belt by hand. If it will move in one direction and not the other, that tells you which side of the pulleys to examine.
If it moves in one direction, you can set the manual jog to 2 mm so the belt moves by one tooth per step, then examine all the pulleys as you step the motor.
And if a diligent search doesn’t reveal the problem, then things get nasty … 
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Currently with a bad back so ive pulled to the best of my abilites. Shouldnt be a fight or flight to pull the belt correct? Ill pop the belt covers off to give me more grip
It goes through the motions to go home on the xy but nothing on the u (z) axis
I got the belt to move freely which has me thinking its the stepper motor now
Before all this, did it home automagically when you turned it on?
That is not typical, because the platform can mash something against the laser head while homing, so if it did not home there may be nothing wrong.
Does the machine have an autofocus pen / switch?
Does the U axis now move with the console jog buttons as it should?
It does have an autofocus/pen style and after the belt moved freely it still did not let me adjust the z (u) axis
Ive noticed the stepper motor moving but not the belt which has me to believe its a lose set screw within the stepper motor
Bingo!
The pulley on the motor in my machine appears to be press-fit on the shaft, but there’s no telling what they did in yours: expect the unexpected!
I noticed on the board that LatU- is staying flashed while LatU+ is blinking
Here to close out the thread, set screw in the stepper motor was the issue! Bed is now leveled out better than when it was shipped! Now time to troubleshoot autofocus and prep for a manual focus test!
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