Epson EPL-N3000 Reference Manual page 312

Invalid AUX I/F Card
This message means that the printer cannot communicate with
the installed optional interface card. Turn off the printer, remove
the card, then reinstall it.
Invalid HDD
Either the optional Hard Disk Drive is damaged or it cannot be
used with this printer. Turn off the printer and remove the Hard
Disk Drive.
Invalid N/W Module
There is no network program, or the network program cannot be
used with the EPL-N3000. Update the program.
Invalid PS3
The program does not exist on the PostScript3 ROM module or
PostScript 3 ROM module that cannot be used on this printer is
installed. You need to update the module.
Jam XXX
The location where the paper jam occurred is displayed at xxx.
xxx indicates the location of the error.
If a paper jam occurs at two or more locations simultaneously, the
corresponding multiple locations are displayed.
Jam A
Jam A B
Paper is jammed at the cover A. For instructions on how to remove
jammed paper at the cover A, see "Jam A (Cover A)" on page 244.
Paper is jammed inside the output path cover (cover A or B) or
fuser unit. For instructions on how to remove jammed paper at the
output path cover or fuser unit, see "Jam A B (Cover A or B)" on
page 248.
Troubleshooting
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