Brother DCP-8080DN/8085DN, MFC-8480DN/8880DN/8890DW 3.6Sensors position

3.6Sensors position

Sensor name	Type	Located on	Function
Regist front sensor	Photo sensor	High-voltage PS PCB	Detect the paper top
			position or absence of
			paper.
Regist rear sensor	Photo sensor	High-voltage PS PCB	Control the first print
			position on the paper.
Paper eject sensor	Photo sensor	Relay rear PCB	Detect whether the paper
			is ejected.
			Detect whether a new
New toner sensor	Photo sensor	Relay front PCB	toner cartridge is installed.
			Detect a new toner
			cartridge type.
Toner LED PCB	Photo sensor	Frame R	Detect whether the toner
(Light emission)			cartridge which contains
			enough toner.
Toner sensor PCB	Photo sensor	Frame L
(Light reception)
Front cover sensor	Mechanical	Frame L	Detect the opening and
	switch		closing of the front cover.
PE sensor	Photo sensor	PE EG sensor ASSY	Detect the absence of the
			paper in each paper tray.
			Detect the absence of
Edge sensor	Photo sensor	PE EG sensor ASSY	each paper tray.
			Detect whether the paper
			is sent from the tray.
MP PE sensor	Photo sensor	MP PE sensor ASSY	Detect the absence of the
			paper in the MP tray.
	Mechanical		Detect the opening and
DX tray sensor		Relay rear PCB	closing of the back cover.
	switch		Detect the absence of the
			DX unit.
Document front	Photo sensor	ADF	Detect the absence of the
sensor 1			paper in the ADF unit.
Document front	Photo sensor	ADF	Detect whether the paper
sensor 2			is drawn.
Document rear	Photo sensor	ADF	Detect the length of the
sensor			paper.
Switch back sensor	Photo sensor	ADF	When the duplex printing,
			detect the timing of
			reversing of the paper.
Document cover			Detect the opening and
	Photo sensor	ADF	closing of the document
sensor
			cover.
HP sensor	Photo sensor	Scanner unit ASSY	Detect the home position
			of the CCD unit.

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