HP Jetdirect 175x Print Server series - Manual (Page 80)

Is the USB light ON solid green?
for HP Jetdirect 175x external print server/Internet connector for USB
and HP Jetdirect 310x external print server/Internet connector for USB
USB port
USB light
Check the USB light on your print server. It should be ON solid green (bright green in color and
glowing continuously, not blinking). If it is not ON solid green, please follow the troubleshooting steps
below.
1. Make sure that you have a USB cable connected between your printer and the USB port on the
print server. It should be a standard USB A-to-B cable, like this:
to print server to printer
Note that the print server does not support parallel-to-USB converters (for connecting a parallel
printer to a USB host) -- it works with USB printers only. Make sure that the cable is connected
firmly to both the printer and the print server.