Epson EPL-N7000 Reference Manual page 358

Menus Locked
This message appears if you try to change the printer's settings
through the control panel when the buttons are locked. You can
unlock them by using the EPSON WinAssist or WebAssist utility.
Refer to the Network Guide for information.
Need Memory
The printer has insufficient memory to complete the current print
job.
To clear this error message, select Clear Warning from the control
panel's Reset menu. See "Reset Menu" on page 410 for
instructions.
To prevent this problem from happening again, add more
memory to your printer as described in "Memory Module" on
page 243 or reduce the resolution of the image to be printed.
Offline
The printer is not ready to print. Press the N Start/Stop button.
The level of remaining toner is also indicated on the right side of
this message.
Optional RAM Error
The optional memory module may be corrupted or incorrect.
Replace it with a new one.
Outbin Select Error
The specified paper size or paper type cannot be output to the
optional 4-Bin Mailbox. Change the paper size or paper type, or
select the face-down tray as the output tray.
Troubleshooting
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