Brother MFC-9130CW Service Manual page 245

(6) Remove the two Pins to remove the Joint arm L from the left side of the Joint cover ASSY.
(7) Remove the two Pins to remove the Joint arm R from the right side of the Joint cover ASSY.
Pin
Joint arm L/R
Joint arm L
(8) Release the two Hooks to remove the Arm R from the Boss of the Joint cover ASSY.
Arm R
Pin
6a
7a
6b
Fig. 3-101
Joint cover ASSY
8b
Fig. 3-102
3-82
Joint cover ASSY
Joint arm R
7b
Boss
Hook
8a
Hook
Arm R
Confidential