Avery Dennison Monarch 9855 Operator's Handbook, Maintenance, Service & Parts Manual page 103

Note: Make sure the printhead cable does not touch the ribbon roll.
10. Clean the new printhead with a cotton swab dipped in isopropyl alcohol
to remove any salt or oil left from handling.
11. Let the printhead dry and reload your supplies.
12. Close the printhead assembly and the cover. Turn on the printer.
13. Press Feed/Cut to position the supply under the printhead.
Care & Maintenance 9-7