Unipulse M252A Operation Manual page 20

2.
Open the flip panel downward. Catch the upper left of the installed ribbon
cassette with your finger（with your fingernail）, and pull and remove it
frontward.
3.
Install a new ribbon cassette, being careful about its orientation.
Turn the ribbon cassette upside down (in the direction that reverses the
PULL marking as shown below), and push it in until you hear it click.
Then close the flip panel, and push in the push panel firmly until you hear
it click.
2. Printer preparations
9