Ricoh M281 Series Service Manual page 362

ARDF (MP 501/601 Only)
5. Remove the ARDF inverter motor unit [A]. (hook×1)

The screw [B] is a ground screw. Be careful not to use the wrong screw when
installing the ARDF paper feed motor and ARDF paper transport motor.
6. Remove the ARDF paper feed motor and ARDF paper transport motor [A].
D255/D256/M281/M282 4-168 SM