Epson EPL-N1200 Reference Manual page 167

7. Insert the imaging cartridge into the printer by placing the
pins on each side of the cartridge into the grooves inside
the printer. Slide it gently into the opening until it stops.
8. Gently press down on the printer cover until it clicks into the
closed position.
Caution:
c
Never transport the printer with the imaging cartridge
installed.
Note:
Be sure to select Toner Count Clear on the SelecType Setup menu
when installing or replacing a new imaging cartridge.
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Troubleshooting and Maintenance