Epson Stylus Pro 4400 Service Manual page 199

EPSON Stylus Pro 4400/4450/4800/4880/4880C
BANDING IN THE PAPER FEED DIRECTION
If banding (uneven density, rough image) in parallel with the paper feed
direction is found on the print, perform the following adjustment:
Bi-D adjustment
The Bi-D adjustment can be executed by any of the following methods.
"HEAD ALIGNMENT" in the Panel setting menu
Printer Driver
Adjustment Program
If the adjustment above does not work to improve the print quality, you may
improve it by adjusting the "THICKNESS NUM" setting value (± 0.1 ~ 0.2mm)
in "CUSTOM PAPER" of the panel setting menu.
Troubleshooting Troubleshooting Based on Your Printout
Revision C
199