Lexmark MS310d Quick Refence Manual page 27

7
Insert the imaging unit by aligning the arrows on the side rails of the unit with the arrows on the side rails inside
the printer, and then insert the imaging unit into the printer.
8
Insert the toner cartridge by aligning the side rails of the cartridge with the arrows on the side rails inside the printer,
and then insert the cartridge into the printer.
9
Close the front door.
10
From the printer control panel, press to clear the message and continue printing.
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