Brother DCP-9040CN Service Manual page 106

(14) Open the Document scanner unit, and then release the Hooks of the Pull arms L and R
from the joint of the Document scanner unit.
Hook
Pull arm L
Joint cover ASSY
(15) Remove the Document scanner unit from the Joint cover ASSY.
Flat cable
Document scanner unit
Fig. 2-18
Fig. 2-19
2-14
Hook
Pull arm R
Document scanner unit
Joint cover ASSY
Confidential