Brother HL-4140CN Service Manual page 409

(15) Remove the six Taptite cup S M3x6 SR screws to remove the Main shield cover plate
ASSY from the Main body.
Taptite cup S M3x6 SR
Main shield cover plate ASSY
Taptite cup S M3x6 SR
(16) Disconnect the three Connectors (CN6, CN10, CN11) from the Main PCB ASSY.
Main PCB ASSY
Main body
Fig. 7-30
CN1
CN8
CN15
CN16 CN17
Fig. 7-31
7-18
<Left side>
CN2
CN5
CN6
CN10
CN11
CN14
CN13
CN22
CN23
CN18 CN20
CN19 CN21
Confidential