Brother HL-3040CN Service Manual page 247

(6) Remove the four Taptite cup S M3x6 SR screws, and then remove the LED PCB cover
and Insulation sheet B from the Sub frame ASSY.
Taptite cup S M3x6 SR
Sub frame ASSY
(7) Disconnect the FFC harness:MAIN-LED CTL (CN5) from the LED head control PCB ASSY.
Note:
- After disconnecting the flat cable(s), check that each cable is not damaged at its end
or short-circuited.
- When connecting the flat cable(s), do not insert it at an angle. After insertion, check
that the cable is not at an angle.
FFC harness:MAIN-LED CTL
Insulation sheet B
Fig. 5-72
FFC harness:MAIN-LED CTL
LED head control PCB ASSY
Fig. 5-73
LED PCB cover
Lock
5-73
Taptite cup S M3x6 SR
Lock
CN5
Confidential