Epson Stylus Pro 4000 Reference Manual page 301

If EPUSBX: (EPSON Stylus Pro 4000) is displayed in the Print
to the following port list, then the USB printer device driver
and printer software are installed correctly.
If the correct port is not displayed, proceed to the next step.
4. Click the Device Manager tab.
If your drivers are correctly installed, EPSON USB Printer
Device should appear on the Device Manager menu.
If EPSON USB Printer Devices does not appear on the Device
Management menu, click the plus (+) sign beside Other
devices to view the installed devices.
If USB Printer or EPSON Stylus Pro 4000 appears under Other
devices, the printer software is not installed correctly.
Proceed to step 5.
Troubleshooting
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