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3.6 Sensors 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.
New toner sensor Photo sensor Relay front PCB
Detect whether a new
toner cartridge is installed.
Detect a new toner
cartridge type.
Toner LED PCB
(Light emission)
Photo sensor Frame R
Detect whether the toner
cartridge which contains
enough toner.
Toner sensor PCB
(Light reception)
Photo sensor Frame L
Front cover sensor
Mechanical
switch
Frame L
Detect the opening and
closing of the front cover.
PE sensor Photo sensor PE EG sensor ASSY
Detect the absence of the
paper in each paper tray.
Edge sensor Photo sensor PE EG sensor ASSY
Detect the absence of
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.
DX tray sensor
Mechanical
switch
Relay rear PCB
Detect the opening and
closing of the back cover.
Detect the absence of the
DX unit.
Document front
sensor 1
Photo sensor ADF
Detect the absence of the
paper in the ADF unit.
Document front
sensor 2
Photo sensor ADF
Detect whether the paper
is drawn.
Document rear
sensor
Photo sensor ADF
Detect the length of the
paper.
Switch back sensor Photo sensor ADF
When the duplex printing,
detect the timing of
reversing of the paper.
Document cover
sensor
Photo sensor ADF
Detect the opening and
closing of the document
cover.
HP sensor Photo sensor Scanner unit ASSY
Detect the home position
of the CCD unit.