Printronix SL4M Quick Setup Manual page 15

Pivoting
Deck
3. Rotate the deck lock lever fully clockwise to close the pivoting
deck.
4. If you have an RFID encoder, you may need to adjust the
coupler. (Refer to the RFID Labeling Reference Manual .)
5. Lower the media cover.
Position The Media Sensor Assembly
Deck Lock
Lever
15