Ricoh SP 330DN Service Manual page 260

ADF/ARDF (for MF models)
Back Side
After a certain time passes since the original reached the ARDF feed sensor [A], the original exit
roller [B] is reversed and the back side of the original is fed. There is no switching mechanism
such as a junction gate; the original is delivered to the duplex scanning path by the curved
surface of the paper path.
The image information of the back side is scanned on the sheet-through glass and the original
is ejected by the transport roller.
M0C3/M0C4/M0C5/M0C6/M0C7 7-18 SM