Canon imageFORMULA DR-4010C Reference Manual page 43

4
Align the cutout on the roller unit with the shaft pin on the main unit.
Note
If the cutout and pin do not fit, rotate the roller until the parts are
properly matched.
5
Slide the roller lock lever to the left and raise the roller unit into
position.
6
Push the roller lock lever up to lock the roller unit.
Maintenance 39