what to do when laser engraving machine galvanometer does wo

what to do when laser engraving machine galvanometer does work properly ?
how to do laser engraving machine galvanometer is not working properly with or without laser?
first, laser engraving machine laser does not have output
Whether the check sequence:
A ,water temperature is too high, the solution: after cooling system water temperature is lowered,it starts to work.
B ,software failure,    the solution: Turn off the software, re-open the run.
C ,laser power is not open,   the Solution: Turn on the laser power switch.
 
Second, the galvanometer is not working properly:
A, graphics beyond the format, the solution: graphics reduced to the normal range.
B,Galvanometer is not powered, the solution: open the scan switches.
key word : laser engraving machine