Epson LQ-510 User Manual page 174

Replacing the Ribbon
7. Use a pointed object, such as a ball point pen, to guide the
ribbon between the print head and ribbon guide while you turn
the ribbon-tightening knob to help feed the ribbon into place. Be
careful not to puncture the ribbon.
8. Slide the print head from side to side to make sure it moves
smoothly. Also see that the ribbon is not twisted or creased.
Maintenance
6-8