Oki MC573 Advanced Manual page 255

4
Tilt forward the fuser unit lock levers (c) to unlock.
5
Hold the fuser unit handle (d) and lift the fuser unit out of the machine.
6
Push the blue lever on the new fuser unit and remove the safety stopper.
7
Hold the handle of a new fuser unit, align the fuser unit to the grooves behind
the toner cartridges, place the fuser unit into the machine.
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6. Maintenance