Hi Hood, 
I did Ref All Home, the Z axis motor turn a bit then stop, after that I cut off home sensor manually On/Off  to ZXY axis accordingly.
Then the Zero button of ZXY axis turn to green, mean home completed. 
Is it mean the JNC-40M control card or driver setting problem, lost the way....  
 
 he driver default setting was Microstep 8, Step/rev 1600, half step, RMS current 2.36A. 
I did the auto calibration for XYZ and tested with Jog step mode to confirm the right resolution.
However, the stupid cnc still couldn't do continue jog and home mode. 
Note:JNC-40M manual over 6000kb failure send out....
Best regard.
Alex