Brother DCP-J4110DW Service Manual page 186

(2) Set the first side CIS unit upright on the CIS carriage, slide it in the direction of the arrow
to remove it, then disconnect the first side CIS flat cable from the CIS unit.
Note: Do not touch the lens of the first side CIS unit by hand.
First side CIS unit
Boss
First side CIS flat cable
Boss
Document scanner bottom cover
CIS carriage
(3_032_E)
3-59
Confidential