Fujitsu DL6400Pro User Manual page 31

Replacing the Subcassette
3-8
10. Press lock tabs B in the direction of the arrows to return feed roller
A to its original position. Then close the cassette lid. Turn the knob
clockwise to check that the ribbon moves smoothly.
Lock tabs B
11. Check off the subcassette replacement column on the cassette label.
12. Install the ribbon cassette (see "Installing the Ribbon Cassette" on
page 3-3).
Knob
User's Manual