Epson DFX-9000 - Manual (Page 127)

Problem Solver 127
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If your drivers are correctly installed, EPSON USB Printer
Devices should appear on the Device Manager menu.
If EPSON USB Printer Devices does not appear on the Device
Manager menu, click the plus (+) sign beside Other devices
to view the installed devices.
If USB Printer appears under Other devices, the USB printer
device driver is not installed correctly. If EPSON DFX-9000
appears, the printer driver is not installed correctly.
If USB Printer, or EPSON DFX-9000 does not appear under
Other devices, click Refresh or unplug the USB cable from
the printer, then plug it into the printer again.