Epson EPL-N7000 - Manual (Page 304)

Troubleshooting 293
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9. Carefully insert the imaging cartridge into the printer,
making sure that the pins on both sides of the cartridge are
aligned with the grooves inside the printer.
Make sure to push the cartridge into the printer until it is
firmly seated in its proper position.
c
Caution:
Do not touch the roller or other parts inside the printer.
Doing so may cause the printer to malfunction.