Brother HL-4040CN Service Manual page 208

(3) Remove the four cup S M3x6 Taptite screws, and then remove the Engine PCB plate.
Engine PCB plate
Taptite, cup S M3x6
Taptite, cup S M3x6
Assembling Note:
When assembling the Engine PCB plate, make sure that the section "A" is caught on the Hook
of the Drive frame unit ASSY.
Fig. 3-144
Hook
Drive frame unit ASSY
Fig. 3-145
Frame unit
Engine insulation sheet
<Left side>
Engine PCB plate
"A"
3-100 Confidential