Lexmark MX310 Series Service Manual page 268

7
Remove the four screws (A).
8
Push and hold the cam restraint to release the MPF shaft.
9
Rotate the MPF shaft inward so that the cams at each end point up.
10
Release the front guide from the guides at each end.
Installation note: The cams at each end of the MPF shaft must point down.
A
Repair information
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