Printronix SL5000r Guide De Référence Rapide page 14

Loading Media And Ribbon
1
Printhead
Media
14
Ribbon
Rear Ribbon Guide Roller
4. Thread the end of the ribbon under the rear ribbon guide roller,
then between the platen and the printhead.
You can also refer to the arrows on the printer frame or to the
upper-right corner of the label inside the media cover for ribbon
loading instructions.