Brother HL-1040 - Manual (Page 45)

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2.3 Sensors
2.3.1 Cover Sensor
Detects opening and closing of the top cover.
Fig. 2-35
2.3.2 Toner Empty Sensor
Detects if there is toner in the toner cartridge. It also detects whether or not the drum unit
is installed. (The toner cartridge is installed in the drum unit).
Fig. 2-36
Toner Empty
Sensor
Cover Switch
Top Cover