The lathe CNC system GSK928TE shows the X and Z position are changing, but the carriage of two axes are not moving.

Check the DY3A stepper drivers and the stepper motors are fine, and the power supply voltages are normal.

Then take off the cover of the CNC system, and found the differences channel IC AM26LS31 on the main board was burned, this caused the CNC system could not output the pulse and direction signals to the stepper driver, so the CNC system shows the position change, but the stepper driver receiving no signal to run the stepper motor.

Change the main board of the CNC system, the problem solved.