Oce 3121 Technical & Service Manual page 374

Remove the four screws (8), and the side plate (7).
5
(8)
Remove the three screws (9), and remove the outer frame (10).
6
Pull the feeding belt (11) out to the front.
7
ed.1
(7) (8)
(9) (10) (9)
(11)
10 RDF 439