My problem was solved a long time ago by a Xerox technician who came on site.
But you should try to add a new printer and choose by "IP address" instead of "default".
And choose "HP Jetdirect - socket" under Protocol.
My system is in french but you can see the settings below.Hope this will help you to solve your problem.
It could be an issue with your driver, have you tried uninstalling and re-installing the latest driver from our website? You can find the most up to date drivers here.
When I print a document from Microsoft Outlook the printer always print an additional page with the text below:
@PJL ENTER LANGUAGE = POSTSCRIPT
The printed document is fine but this additonnal page is really anoying...
This issue only appens with MacOs High Sierra (XeroxDrivers_5.6.0_2187).
Can someone help me to disable this printed message?