Epson EPL-N2550 Series User Manual page 184

The Duplex Unit's cover is open.
Duplex Mem Overflow
There is not enough memory for duplex printing. The printer
prints only on the front and ejects the paper. To clear this error,
follow the instructions below.
If Off is selected as the Auto Cont setting on the control panel's
Setup Menu, press the N Start/Stop button to print on the back
of the next sheet, or press the + Cancel Job button to cancel the
print job.
If On is selected as the Auto Cont setting on the control panel's
Setup Menu, printing continues automatically after a certain
period of time.
Form Feed
The printer is ejecting paper due to a user request. This message
appears when pressing the N Start/Stop button once to make the
printer offline, and then holding down the N Start/Stop button
for more than 2 seconds in order not to receive form feed
command.
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 "How to access the control panel menus" on page
149 for instructions.
184
Using the Control Panel