During printing: Z axis automatically drops / X, Y axis suddenly stops on UP300

Z axis suddenly drops automatically in the printing process, or X-Y axes suddenly stop. After reinitialization, the faulty axis is not powered.

Following possibilities will cause this fault for your reference,

1. Initialize the device/Wire inspection limit problem  

• Check if the initialization of each axis is normal
  
• Check if the wire inspection switch turns on/off normally

2. Motor cable of fault axis is broken, plug is loose

• Turn off the power, remove the rear panel and check if the motor wire of the fault axis is broken; if not, re-plug the motor plug of the fault axis
  

3. Fault axis structure damage (motor pulley loose, belt loose, etc.)

• Turn off the power, manually move the fault axis, check if the motor pulley is loose, and if the conveyor belt is loose. If yes, replace it accordingly
  

4. Motor drive of fault axis /mainboard damaged

• Turn off the power and replace the mainboard
  

5. Motor of fault axis damaged

• Turn off the power and replace the motor of the fault axis