Epson PLQ-20 Reference Manual page 116

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 PLQ-20
appears, the printer driver is not installed correctly.
If USB Printer, or EPSON PLQ-20 does not appear under
Other devices, click Refresh or unplug the USB cable from the
printer, then plug it into the printer again.
Chapter 6 Problem Solver 116