Brother DCP-9040CN Service Manual page 246

(4) Remove the cup S M3x6 Taptite screw, and then remove the Main PCB ASSY as shown by
arrows 4a and 4b.
Main PCB ASSY
Frame unit
4a
4b
Taptite, cup S M3x6
<Left side>
Fig. 3-155
3-114
Confidential