Epson EPL-N7000 Reference Manual page 356

Image Optimum
There is insufficient memory to print the page at the specified
print quality. The printer automatically lowers the print quality
so that it can continue printing. If the quality of the printout is not
acceptable, try simplifying the page by limiting the number of
graphics or reducing the number and size of fonts.
To clear this error, select Clear Warning from the control panel's
Reset menu. See "Reset Menu" on page 410 for instructions.
Turn the Image Optimum setting off on the control panel's Printing
menu if you do not want the printer to automatically lower the
print quality to continue printing.
You may need to increase the amount of printer memory to be
able to print at the desired print quality for your document. For
more information on adding memory, see "Memory modules" on
page 381.
Install Imaging Cart
The imaging cartridge is not installed in the printer.
Install the imaging cartridge. See "Replacing the imaging
cartridge" on page 258.
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, and 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.
Troubleshooting
9
9
9
9
9
9
9
9
9
9
9
9
345