Dark lines in halftone fill areas can appear at 75 mm intervals when the machine is operating in a room where the humidity is very low. (The low humidity causes variation in light sensitivity across the surface of the drum.)
To prevent this problem, perform the following procedure.
Start CE Tools.
Click [Adjust Other Settings].
Select [1] (On) for Low Humidity Mode.
When this humidity mode setting is on, the drum is rotated slightly every 15 min. to keep the light sensitivity consistent across the entire surface of the drum.
