Printronix T5000 Series Quick Reference Manual page 30

Loading Media And Ribbon
10. Close the printhead by pressing down on both sides of the front
of the pivoting deck and rotating the deck lock lever
counterclockwise against its stop. This locks the pivoting deck
and printhead assembly into the printing position.
CAUTION
Ensure the pivoting deck is down and locked before
attempting to print. The printer will not operate if the pivoting
deck is not locked down.
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1
Legend:
1) Pivoting Deck
2) Deck Lock Lever
2