Brother DCP-L8400CDN Service Manual page 276

(4) Remove the four Taptite cup B M3x10 screws and remove the Panel control PCB shield
plate cover from the Control panel ASSY.
Panel control PCB
shield plate cover
(5) Release the Lock and disconnect the Flat cable (CN1) of the Panel PCB unit.
(6) Disconnect the Flat cable (CN2) from the Panel PCB unit. (Model with NFC only)
(7) Remove the Panel PCB unit from the Control panel ASSY.
Lock
CN2
Panel PCB unit
Taptite cup B M3x10
Fig. 3-143
Flat cable
CN1
Flat cable
Flat cable
Fig. 3-144
3-112
Control panel ASSY
Control panel ASSY
Confidential