HP 170X - Manual (Page 20)

2-4 Hardware Installation
If you want to change the detected printer language, use the LEDs
and Test button to select a PDL for the configuration page. When
you hold down the Test button for three seconds, the LEDs begin to
cycle through four configurations, as outlined in the following table.
Release the Test button when you get the right PDLs, and the
configuration page will be printed.
When you first press the Test button, the Status and Activity LEDs
are on and solid for about 3-4 seconds. Then they switch off,
indicating they are cycling through the PDLs.
Resetting to Factory Defaults
Once you have configured the HP JetDirect external print server,
the configuration settings are retained in memory unless you
manually reset them.
(The firmware is not affected when you reset the configuration
settings.)
To reset the configuration settings to their factory defaults, follow
these steps:
1. Unplug the power cord from the print server.
2. While holding down the Test button on the print server, plug the
power module into the print server and continue to hold down
the Test button for five seconds. All previous configuration
settings will be erased.
For PDL...
The Status
LED is... And the Activity
LED is...
HP PCL (default) Off Off
ASCII Off On
Postscript On Off
HP-GL/2 On On