Epson EPL-N2750 Quick Reference Manual page 16

Cover A, on the right side of the MP tray, is open. Pull
up the latch on cover A, then close the cover firmly.
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Warning:
Do not touch the hot areas indicated on the caution
labels inside cover A.
If you still cannot close the cover, the imaging cartridge
may not be installed correctly. Reinstall the imaging
cartridge as described in "Replacing the Imaging
Cartridge" on page 26.
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The cover on the right side of the standard lower
cassette, an optional 500-Sheet Lower Cassette Unit, or
the Large Capacity Paper Unit is open. Pull the latch on
the cover indicated by the message and then close the
cover firmly. (The numbers indicate the order in which
the cassettes are stacked from top to bottom).
Cover D, on the back of the Duplex Unit, is open. Pull
the latch on cover D and then close the cover firmly.
Cover E, on the back of the 5-Bin Multi-Purpose Unit, is
open. Pull the latch on cover E and then close the cover
firmly.
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