Fujitsu ApeosPrint C4030 Reference Manual page 122

[Refresh Toner]
Re-adjusts the toner density and the developer voltage. Refreshing toners optimizes the print
quality.
Note
 Do not perform Refresh Toner too many times. Otherwise, the toner would decrease at a fast pace.
[Clean Transfer Belt]
If dust stick to the Transfer Belt, the black or colored vertical stripes or lines may appear on the
printed image. To improve this fault, clean the Transfer Belt.
[Productivity Optimization]
Set whether to focus more on the speed or the image quality on the printing.
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