Ricoh M281 Series Service Manual page 368

Paper Feed Unit (Paper Feed Unit PB1100)
4. Turn over the optional paper feed unit [A], and then remove the board cover [B].
(hook×2)
5. Release the harness of the main board [A] from the harness guides.
6. Disconnect the five connectors from the main board [A].
7. Turn over the optional paper feed unit again, and then remove the upper cover [A].
(hook×1)
D255/D256/M281/M282 4-174 SM