Brother MFC8420 Service Manual page 160

(5) Remove the cup S M3x6 Taptite screw.
(6) Remove the ground wire.
(7) Remove the six bind B M4x12 Taptite screws.
(8) Remove the cup S M3x10 Taptite screw.
(9) Remove the cup S M3x6 Taptite screw, and then remove the sub gear plate.
(10) Remove the LD harness 5P from the drive unit.
(11) Remove the drive unit.
(12) Disconnect the connector for the main motor harness from the main motor ASSY.
Taptite, cup S M3x10
LD harness 5P
Sub gear plate
Taptite, cup S
M3x6
Taptite, bind B M4x12
Taptite, bind B M4x12
Taptite, cup S M3x6
Frame L
Drive unit
Fig. 4-139
4-79
MFC-8420/8820D/8820DN, DCP-8020/8025D/8025DN
Main motor harness
Main motor ASSY
Ground wire
SERVICE MANUAL