Oki ES 1624n MFP User Manual page 105

Note the positions of the four image drums: Cyan (1), Magenta
2.
(2), Yellow (3), Black (4). It is essential that they go back in the
correct order!
If the printer has been powered on, the fuser is hot. This
area is clearly labelled. Do not touch it.
WARNING!
Clearing Paper Jams • 105