Lexmark E 240 User Manual page 32

How to load the 250-sheet and 550-sheet trays
Attaching the dust cover
The dust cover helps protect the paper tray from
the environment as well as keep the tray from
being knocked out of position while it is extended.
Attach the dust cover to the back of the printer by
aligning the tabs on the cover to the holes on the
printer, and snap the cover into place.
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