a)Where there is a blank screen and handpiece indicator lamp is not on, try plugging off and then plugging in the FFC connecting line again.
b)Where there is a blank screen and handpiece indicator lamp is on, try replacing the handpiece display component.
c)For any phenomenon (e.g. mess-up or white strips), try replacing the handpiece display component.
d)If, however, this problem still exists, replace the handpiece control board. Since the handpiece control board stores the relevant important information of this handpiece, implement delivery inspection again as per the standard of new handpiece if the condition permits; otherwise, written the original handpiece information in the new handpiece control board. (Handpiece parameter, handpiece calibration parameter, etc.)