Unisys E-@CTION EFP9800 - Manual (Page 36)

Operating the Printer
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3. Pull the used ribbon cassette out of the printer and discard it.
Be careful not to bump or damage the Form Out sensor while you remove
the ribbon cassette.
4. Snap in the new ribbon cassette, and close the cassette cover.
Caution
Do not remove the mylar shield on the ribbon cassette. It protects against
smudging. The ribbon cassette will be ruined if it is removed.