Ricoh M281 Series Service Manual page 324

Electrical Components
6. Remove the seven screws from the controller box [A].

The screw [B] is a tapping screw. Be careful not to use the wrong screw when
installing the controller box.
7. Release the hook [A], and then remove the controller box [B] by rotating it
counter-clockwise.
D255/D256/M281/M282 4-130 SM