Oki MC573dn User Manual page 178

11
Remove the jammed paper slowly by pulling the edge of paper.
12
Hold the lock levers of belt unit and place the belt unit into the machine.
13
Turn the lock levers (e) on the both sides of the belt unit forward.
14
Hold the fuser unit handle and place the fuser unit into the machine.
While setting the fuser unit, be careful not to hit it to the LED head.
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9. Troubleshooting