Oki MC573dn User Manual page 179

15
Tilt the lock levers (d) on the both sides of the fuser unit.
16
Replace the four image drums into the machine
While setting consumables, be careful not to hit them to the LED head.
17
Close the output tray (b) slowly and push the center of the output tray for
confirmation.
18
Hold the handle (B) to close the scanner unit (a).
Do not close the scanner unit vigorously. It may cause the document feed roller of ADF to fall and get in the way
of loading documents.
If the document feed roller of ADF has fallen, open and close the ADF cover.
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9. Troubleshooting