Epson LQ-300 User Manual page 26

4. Insert the ribbon cartridge into the printer as shown; then
press both sides of the cartridge down firmly to fit the
plastic hooks into the printer slots.
5. Use a pointed object, such as a ball point pen, to guide the
ribbon between the print head and ribbon guide. Turn the
ribbon-tightening knob to help feed the ribbon into place; it
should not be twisted or creased.
6. Slide the print head from side to side to make sure it moves
smoothly.
7. Reinstall and close the printer cover.
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Setting Up the Printer