Brother hl 1650 - B/W Laser Printer Service Manual page 141

(4) Release the hook of the gear to remove the switch arm ASSY and then remove the T-belt
by releasing the hook of the two gears.
Gear
(hook)
T-belt
(5) Remove the two cup S tite 3x6 screws to remove the gear pressure plate from the gear
plate.
(6) Shift the pendulum gear 30 to the arrow direction and release the hook from the gear 21 to
remove the gear 21 by pulling upward through the opening space of the gear plate.
Screw, cup S tite 3x6
Pendulum gear 30
Switch arm ASSY
Gear
(hook)
Fig. 4-74
(hook)
Gear 21
Fig. 4-75
4-43
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(hook)
Drive unit
Gear pressure plate
Gear plate