Brother DCP-L8400CDN Service Manual page 293

(3) Release the wiring of the FG harness from the Back cover upper.
(4) Release the Hook and remove the two Flat cores of the Modem flat cable from the Back
cover upper.
Flat core
Hook
(5) Remove the Screw pan (S/P washer) M3.5x6 screw and remove the Modem ground
harness from the High-voltage power supply PCB ASSY.
(6) Disconnect the wiring of the Modem ground harness.
Modem ground harness
Screw pan (S/P washer) M3.5x6
<Right side>
Modem flat cable
Fig. 3-173
Fig. 3-174
3-129
Back cover upper
High-voltage power
supply PCB ASSY
Confidential