Epson Stylus Pro 4000 Field Repair Manual page 120

Stylus Pro 4000 Field Repair Guide 4/28/05
Additionally the Borderless Pads and Flushing Box should be checked to verify that they are not out of position or
dirty. If a build up of contaminants makes contact with the Nozzle Plate, it will cause reoccurring Nozzle drop out.
A Nozzle with a slight inaccuracy can cause horizontal banding. The M/W ADJ: feature located in the User Paper
Config menu, is designed to change the Nozzle use pattern. Changing the Nozzle use pattern can minimize the fre-
quency that a problem Nozzle is used, impacting the horizontal banding. Try all 3 settings (Standard, 1, and 2) and
pick the best.
Horizontal Banding Printer Component, Software Item, LCD Display, Printer Button Page 120.