Xerox Document Centre 220 User Manual page 231

NOTE: If the staple cartridge door has been open longer
than 30 seconds when closed, the Finisher Tray
immediately returns to its raised position. If the staple
cartridge door has been open less than 30 seconds when
closed, the Finisher Tray does not return to its operating
position. Press and release the button on top of the Finisher
to return the Finisher Tray to its operating position.
Xerox Document Centre 220/230/332/340 User Guide Page 9-15