HP Jetdirect 175x Print Server series - Manual (Page 54)

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A solid green USB LED on the top front indicates a good USB-II connection, as
illustrated above.
If your LEDs are not solid green, see interpreting the LEDs and diagnosing problems
5. Verify the connection with the printer by printing a configuration (test) page:
Briefly press and release the test button on the rear end of the print server. The page should
soon emerge from the attached printer.
Interpreting the configuration page and diagnosing problems
If the page does not appear on the printer, or if it is unreadable, go to this Troubleshooting page ,
and then return to this User’s Guide to continue with the installation.