Lexmark CX725
Remove the tray insert.
Remove the right cover. See 550-sheet tray right cover removal.
Disconnect the two cables (A), and then remove the screws (B).
Squeeze, and then push the latches into the tray base to release the cable.
Prevent jams and paper feed problems. Change the defective tray insert to maintain proper printing performance.
Checking the parallel or serial interface card for proper installation can help you print again from the computer.