The vertical banding on a print image may be improved by the [Drum Rotation] function.
Select a drum rotation level.
Menu > Maintenance > Quality Maintenance > Drum Rotation
Select a drum rotation level from the following 2 levels: Level 1 (Normal) and Level 2 (Strong).
<Operation>
Level1 : Photo conductor idles for 55 seconds
Level2 : Photo conductor idles for 30 seconds (for black and white vertical banding)
<Effectively Prevented Phenomena>
Level1 : Pieces of white banding (for half tone or continuous printing)
Level2 : White vertical banding (for half tone), black vertical banding, and black horizontal banding
If the [Drum Rotation] function is performed many times, the life of the drum unit may be shortened.