Brother MFC8420 Service Manual page 104

(14) Disconnect the four connectors.
(15) Remove the cup S M3x6 Taptite screw, and then remove the ground wire.
(16) Remove the four cup B M3x10 Taptite screws, and then remove the ADF chute ASSY.
Connector
ADF relay PCB ASSY
Connector
Ground wire
(17) Remove the conductive bushing, and then remove the PF roller holder ASSY.
(18) Remove the conductive bushing, and then remove the LF roller 1 ASSY.
LF roller 1 ASSY
ADF chute ASSY
ADF motor
Taptite, cup S M3x6
Document cover LGL
MFC-8420/8820D/8820DN, DCP-8020/8025D/8025DN
Fig. 4-38
PF roller holder ASSY
Fig. 4-39
4-23
SERVICE MANUAL
Taptite, cup B M3x10
ADF chute ASSY
Taptite, cup B M3x10
Conductive bushing
1
2
1
Conductive bushings