Brother HL-3040CN Service Manual page 321

(4) Release the three Hooks to remove the Waste toner sensor from the Waste toner sensor
holder.
Waste toner sensor holder
Hook
(5) Disconnect the Connector of the Waste toner harness ASSY from the Waste toner sensor.
Waste toner sensor
Harness routing: Refer to
Hook
Fig. 5-197
Waste toner harness ASSY
Fig. 5-198
" Waste Toner Sensor."
5-147
Hook
Waste toner sensor
Confidential