I have not attached a printer like this before but it should work. According to the IBM document you should be using *HP520 for your configuration. You should review this web page:
Information on Printers from Hewlett-Packard (HP).
How do you have it configured? Is it configured as a LAN printer on the system or is it connected via a Client Access session? You might post the configuration and someone may be able to review it and give you a better answer. You can retrieve the source of the printer into a file and then post that. This is an example:
RTVCFGSRC CFGD(PRINTER) CFGTYPE(*DEVD) SRCFILE(YOURLIB/QCLSRC)