Sensors; Cover Sensors; Toner Sensors - Brother MFC8440D Service Manual

7/13/2019
2.4

Sensors

2.4.1

Cover sensors

Detect opening and closing of the front cover.
2.4.2

Toner sensors

Detects if there is toner in the toner cartridge. The toner sensor at the left side emits light
through the window on the left side of the toner cartridge, then the toner sensor at the right
side receives it when the toner is low. They also detect whether or not the drum unit is
installed. (The toner cartridge is installed in the drum unit.)
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Brother 8840D Service Manual
MFC-8440/8840D/8840DN, DCP-8040/8045D/8045DN
Front cover sensor
Fig. 3-25
Toner sensor (Light emission)
Fig. 3-26
3-17
SERVICE MANUAL
Toner sensor
(Light reception)
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