Brother DCP-9045CDN Service Manual page 298

(4) Remove the two cup S M3x6 Taptite screws, and then remove the Drum drive motor 1.
(5) Remove the two cup S M3x6 Taptite screws, and then remove the Drum drive motor 2.
Drum drive motor 2
Taptite, cup S M3x6
Assembling Note:
The two Gears 39/121 which are engaged with the same motor are phased with each
other when assembling the Drum drive ASSY. If removing the motor to replace it, the
gears may be out of phase. When replacing the motor, therefore, be sure to phase the
Gears 39/121, and then assemble the motor. For the method how to phase the gears,
refer to the figure below (Fig. 3-239).
Align the mark on the Gear
with the line on the Drum
drive plate.
Drum drive motor 1
Taptite, cup S M3x6
Fig. 3-238
Drum drive ASSY
Gears 39/121
Align the mark on the Gear with
the space between the two lines
on the Drum drive plate.
Fig. 3-239
3-165
Frame unit
<Left side>
Gears 39/121
Confidential