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Solution
If printed images are affected by banding in different colors across the sheet, execute Adj. Quality for automatic adjustment of the paper feed amount.
There are two modes of automatic adjustment to correct banding: Auto(GenuinePpr) and Auto(OtherPaper). In either mode, the printer prints and reads a test pattern for automatic adjustment of the feed amount.
Use this mode with paper identified in the Paper Reference Guide.
Use this mode with paper not in the Paper Reference Guide, or if Auto(GenuinePpr) does not eliminate banding.
Caution
In this case, use Manual adjustment.
(See "Manual Banding Adjustment (Adj. Quality) (iPF6400S/iPF8400S)")
Caution
(See "Selecting a Feed Amount Adjustment Method (Feed Priority) (iPF6400S/iPF8400S)")
(See "Fine-Tuning the Paper Feed Amount (Adj. Fine Feed) (iPF6400S/iPF8400S)")
(See "Adjusting Line Length (Adjust Length) (iPF6400S/iPF8400S)")
⋖Items to Prepare⋗
When Using Rolls : An unused roll at least 254.0 mm (10.00 in) wide
When Using Sheets :
Auto(GenuinePpr) : One sheet of unused paper, A4/Letter size
Auto(OtherPaper) : Two sheets of unused paper, A4/Letter size (or one sheet when using A2)
Perform adjustment as follows.
1.Load the paper.
Caution
2.On the Tab Selection screen of the Control Panel, press 
Caution
3.Press the OK button.
The Set./Adj. Menu is displayed.
4.Press 
5.Press 
6.Press 
7.Press 
A test pattern is printed for adjustment.
Adjustment is now finished if you have printed on a roll or a sheet of A2 size or larger.
8.If you are printing on sheets smaller than A2 size for Auto(OtherPaper), a confirmation message is shown on the Display Screen requesting you to continue printing.
Press the OK button and follow the instructions on the Display Screen.