Epson ActionPrinter L-750 User Manual page 19

Assembling the Printer
5. Use a pointed object, such as the tip of a pencil, 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.
6.
Slide the print head from side to side to be sure it moves
smoothly. Also check that the ribbon is not twisted or creased.
1-12 Setting Up Printer
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