Oki MC573 Advanced Manual page 262

7
Close the separation roller cover (f).
8
While pressing the right arm (b) on the MP tray (a) inward, slightly lift the MP
tray (a) and hook the tab (c).
Closing the MP tray without putting the tab back in place may crack the paper set cover. Be sure to put it back in
place.
9
In the same manner, while pressing the left arm on the MP tray inward, slightly
lift the MP tray and hook the tab.
10
Close the MP tray (a).
If the MP tray cannot be closed, press the paper setting part of the MP tray downward
to put the paper set cover back in place.
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6. Maintenance