The unit is about 18 months old.
He is trying to engrave a chess board on glass sheet. As the laser rasters over the squares it starts off OK. After engraving about 5 mm of the squares the laser stops marking the material for a 1mm strip then resumes for the next 20mm. On the second set of squares it misses a stripe about 2 mm thick and gets worse as it goes further.
I suspect the problem is with the setup of the tube tickle or the laser tube may need a recharge.
The room its in is not too hot, ventilation is OK and the unit will cut vectors without a problem.
Has anyone any suggestions
