Epson EPL-N2000 Reference Manual page 147

Form Feed
When the printer is off line and data remains in the printer's
memory, pressing Form Feed prints out the data and clears
the buffer. After printing,
Illegal AUX I/F Card
The printer cannot read the installed optional interface card.
Turn off the printer, then remove the card.
Both the LocalTalk/Serial module (set in LocalTalk) and the
LocalTalk Type B interface card are installed simultaneously.
Remove one of them.
Illegal Card
An incompatible PCMCIA card is installed in the printer.
To correct this error, (1) turn off the printer and remove the
card, then turn on the printer, or (2) remove the card while the
printer is on, then press the Continue button.
Illegal I/F Module
The printer cannot read the installed optional LocalTalk/Serial
module. Turn off the printer, then remove the module.
appears on the display.
Troubleshooting and Maintenance
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