F/gum T-4. Removing the top cover
1. Turn the tension knob counterclockwise on the ribbon cartridge to
tighten the ribbon if it is slack.
2. Guide the ribbon between the print head and the silver print head shield,
making certain that the spindles on the cartridge holder fit into the
sockets on the cartridge itself.
int head shield
F/gum 1-5. Installing the ribbon cartridge