Epson LX-810 User Manual page 182

Replacing the Ribbon
5. To remove excess slack in the new ribbon, turn the ribbon-
tightening knob in the direction of the arrow.
6. Push the new ribbon cartridge firmly into position, making sure
the plastic hooks fit into the slots, as shown below.
Note: Press lightly on both sides of the cartridge to make sure
the hooks are properly inserted.
6-6 Maintenance