Printer is getting error message 40 and 41 as well as EIO Error

eio slot   Dan jack hammer slot

1 open EIO slot HP JetDirect 600N internal print servers for Ethernet, Token Ring

Set up a network: this model has an HP Jetdirect Fast Ethernet print server embedded on the device formatter board, which leaves the EIO slot open for and third-party solutions via open DIMM and EIO slots and a foreign interface port Choose from a variety of solutions, including wireless, Gigabit Ethernet, or

downton abbey slot Up to 600 x 600 dpi Up to 15 ppm 64 MB Hi-Speed USB port, EIO slot CLJ 3600N, Up to 600 x 600 dpi Up to 15 ppm 128 MB Hi-Speed USB port, EIO slot  Some printers have three EIO slots - the Color LaserJet 5500 and 9500 do for instance The LaserJet 4000 has two, as does the LJ-4300 but one of these is