I have tried printing the example image and find that the laser travels back and forth gradually moving down however for about 90% of the print run there is no laser, at the very end of the run there is a circle but with varying intensity of burn.
I found that there are various test run files in the memory which I assume was done by the inspection team, however, running this file although produces a complete image once again the burn intensity is variable.
Therefore I think the laser output is not consistent through the burn for some reason or other.
When burning the test file the laser head follows the outline which is not the same as the example file. I assume this is because they are different images, vector or bitmap, maybe?