Sharp MX-M550U Service Manual page 330

15) Remove the bearing, pulley, gear and pin from the transport
roller 21.
f. Duplex motor 1
1) Pull out the left door.
2) Remove the cover.
3) Remove the duplex motor 1.
g. Duplex motor 2
1) Pull out the left door.
2) Remove the cover.
3)
h. Paper exit gate solenoid
1)
2)
3)
i. Duplex paper entry detector
1)
2)
MX-M700N DUPLEX SECTION H – 7
Remove the duplex motor 2.
Pull out the left door.
Remove the cover.
Remove the paper exit gate solenoid.
Pull out the left door.
Remove the paper guide unit.