Epson EPL-N2550 Series User Manual page 183

The paper size setting is different from the size of paper loaded
in the printer. Check to see if the correct size of paper is loaded in
the specified paper source.
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.
Check Paper Type
The media loaded in the printer does not match the paper type
setting in the printer driver. Media that matches only the paper
size setting will be used for printing.
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.
Collate disabled
Printing by specifying the number of copies is no longer possible
due to a lack of memory (RAM). If this error occurs, print only
one copy at a time.
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.
Cooling Down
The printer lowers its temperature to optimize for the fixing toner.
Wait for a moment for Ready to appear in the LCD panel.
DM Error 001
The Duplex Unit has become separated from the printer. Turn the
printer off, reinstall the Duplex Unit and turn the printer on again.
DM Open
Using the Control Panel
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