Brother DCP-J552DW Service Manual page 171

Document scanning position sensor PCB ASSY
(14) Turn the ADF unit downside up.
(15) Push the lock arm towards you, remove the front end of the document scanning position sensor
PCB ASSY from the lock arm, and take out the document scanning position sensor PCB ASSY.
Disconnect the document scanning position sensor harness from the PCB.
Document scanning position sensor PCB ASSY
ADF harness ASSY
Document scanning position
sensor harness
(Rear)
ADF unit
Lock arm
3-54
(3_072)
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