Use photo paper to check weekly or when encountering unsatisfactory welding results with the usual laser power that the laser is still correctly set:

1. Place photo paper on the floor of the working chamber over the round black aluminum plate.
    
2. Set the following pulse parameter values: 300 V - 5 ms - 0,0 Hz - 2.0 mm
    
3. Use the foot switch to trigger a laser pulse.
    
4. Check the burn spot imprint on the photo paper: The imprint must be evenly round and bright.
   The edge may only have a slightly roughened, black edge.
   The black photo layer must be evenly degraded.