re: EPSON 4000, Paper Feed Adjust Utiity
Take a look at this. I tried it, it's easy to use. My printer needs no adjustment.
Download it here: Paper Feed Adjust Utiity
This self-extracting file contains the Epson Stylus Pro 4000 Paper Feed Adjuster Utility for Windows 98, Me, XP and 2000. This utility allows you to perform paper feed adjustments to remove dark or white horizontal micro banding and MicroWeave adjustments to select the best pattern of ink dots produced by the printhead. Please view the included "Utility Manual for EPSON Paper Feed Adjuster" for additional information.
Note: Before installing this utility, please remove prior versions of the Paper Feed Adjuster Utility. Your printer driver and firmware for the Stylus Pro 4000 must be the latest version for this utility to perform properly.