How do you change ribbon on canon mp49d calculator?

To change the ribbon on a Canon MP49D calculator, first, turn off the calculator and unplug it. Open the ribbon compartment by lifting the cover, then carefully remove the old ribbon spool. Install the new ribbon by placing it on the spools in the correct orientation, ensuring that it threads properly through the print head. Finally, close the compartment and test the calculator to confirm the ribbon is functioning correctly.