[Drum Refresh Mode]
Overview
Press [Start] to rotate the photoreceptor for 3 minutes and refresh the front side.
Perform this function when image blur occurs on the halftone image.
Example of poor image
Setting Items
Screen access
Touch panel - [MACHINE] - [Adjustment] - [Drum Refresh Mode]
in the upper-right of a page, it turns into 
and is registered as a bookmark.