Ok, the printer is configured to accept PCL 6. So, I assume that you're using a PCL driver? Is this the vendor-supplied driver, or an openprinting driver? I assumed from your first post that KPDL (PostScript) was being used, and the output snippet you shared looked like PS code being printed (as opposed to the document expected).

For troubleshooting, I can only offer general advice. I don't own such hardware. These may be helpful to you.
https://en.opensuse.org/SDB:CUPS_in_a_Nutshell
https://fedoraproject.org/wiki/How_t...nting_problems