Epson ActionPrinter L-750 User Manual page 73

Replacing the Ribbon
4. To remove excess slack in the new ribbon, turn the ribbon-
tightening knob in the direction of the arrow.
5. Push the new ribbon cartridge firmly into position, making sure
the plastic hooks fit into the printer.
Note:
Press lightly on both sides of the cartridge to be sure the
hooks are properly inserted.
Troubleshooting and Maintenance 4-9