Epson TM-U330 Technical Reference Manual page 31

TM-U330 Technical Reference Guide
3. Insert the ribbon in the position and push the ribbon cassette down until it clicks.
Make sure the ribbon is installed between the print head and the platen without wrinkles or creases.
4. Again turn the ribbon cassette's knob 2 or 3 times in the direction of the arrow.
CAUTION:
Be careful not to touch the print head with your fingers when turning the ribbon cassette knob because the
print head is hot and you might be burned.
5. Close the ribbon cassette cover.
Setup 3-6