Monarch Instrument 9403TM - Manual (Page 73)

5. Wind the supplies back onto the supply roll.
6. Remove the ribbon, if one is loaded. See Chapter 2,
"Loading a Ribbon."
7. Moisten a cotton swab with isopropyl alcohol.
8. Rub the swab across the printhead and remove any build-up.
9. Clean the platen roller with a dry cloth or small brush.
However, if there is adhesive gum build-up on the platen
roller, moisten a cotton swab with isopropyl alcohol. Run the
cotton swab or dry cloth across the platen roller. Make sure
the platen roller is clean all the way around.
10. Re-load the supply roll and ribbon, if necessary.
11. Turn the printhead lever clockwise to close the printhead.
12. Turn on printer.
If printing has not improved, call Technical Support.
Printhead
Platen
Roller
Cleaning 9-3