Epson DFX-9000 Reference Manual page 138

9. Insert the ribbon guide over the metal pins on each side of the
print head as shown below. The smaller end of the guide
should be on top, with its angled edge facing back toward the
platen. Turn the ribbon-tightening knob again to remove any
slack in the ribbon.
10. Slide the print head from side to side to see that it moves
smoothly and that the ribbon is not twisted or creased.
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Options and Consumables
print head
ribbon guide