Oki OKIOFFICE 84 Service Manual page 215

g) Remove the Plate Assembly-Scanner (R) and Plate Earth ADF by removing the three screws.
h) Remove the Plate Scanner (B) by removing the two screws and the part of the fixing hooks.
i) Remove the CIS (contact image sensor).
j) Motor-S: Remove the Motor-S by removing the connector of motor and the two screws