Epson EPL-N1200 Reference Manual page 159

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, Ready appears on the display.
Illegal AUX I/F Card
The printer cannot read the installed optional interface card.
Turn off the printer, then remove the card.
Illegal I/F Module
The printer cannot read the installed optional LocalTalk/Serial
module. Turn off the printer, then remove the module.
Image Optimum
The printer cannot print at the requested quality level because
of insufficient memory, and the printer reduces the quality
automatically so that the printer can continue printing. Check
to see if the printout is acceptable. If not, add more memory
(for a permanent solution) or set Device Resolution to Low
(300 dpi) and Page Protect to OFF temporarily in the driver.
Manual Feed XXX
Manual Feed mode is specified for the current print job. Make
sure the paper size indicated by XXX is loaded in the MP Tray,
then press On Line.
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Troubleshooting and Maintenance