Brother DCP-J4110DW Service Manual page 250

(5) Release the hook on the registration sensor holder and remove the registration sensor
holder from the frame base.
(6) Warp the registration sensor inwards to release it from the guide, then slide off the
registration sensor PCB ASSY in the direction of the arrow.
Registration sensor holder
Assembling Note: Set the registration sensor PCB ASSY to its holder while pressing the sensor
section of registration sensor PCB ASSY.
Frame base
(Front)
3-123
(Rear)
Hook
Registration sensor PCB ASSY
(3_112_E)
Confidential