Epson EPL-N2750 Reference Manual page 189

To correct this error, (1) press the Continue button, or (2) turn off
the printer, then remove the ROM module from slot A.
Format Error ROM B
A ROM module which is not formatted is installed in slot B. If the
ROM had been written to, it is possible that the writing was not
completed. Also, the ROM's memory may no longer be accessible,
in which case you should replace it.
To correct this error, (1) press the Continue button, or (2) turn off
the printer, then remove the ROM module from slot B.
Form Feed
When the printer is offline and data remains in the printer's
memory, press the Form Feed button to print out the data and
clear the buffer. After printing, Ready appears on the LCD panel.
HDD CHECK
The printer is checking the optional Hard Disk Drive.
Image Optimum
The printer cannot print at the requested quality level because of
insufficient memory, and the printer reduces the quality
automatically so that it can continue printing. Check to see if the
printout is acceptable. If not, add more memory (for a permanent
solution) or temporarily set the Print Quality setting to Low in the
printer driver.
Insert Imaging Crtg
The imaging cartridge is not correctly installed. See "Replacing
the Imaging Cartridge" on page 5-2 to reinstall it.
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Troubleshooting