Epson LX-300 User Manual page 24

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. Re-install and close the printer cover.
When the printing becomes faint, you need to replace the ribbon
cartridge. To remove the old ribbon cartridge, first move the print
head to the center of the printer. Then remove the cartridge by
lifting the posts on the either side and taking it out of the printer.
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Setting Up the Printer