Brother International HL 1850 Service Manual - Page 96
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2.3 2.3.1 Sensors Cover sensors Detect opening and closing of the front cover. Shutter arm C MP sensor PCB assy HL-1850/1870N SERVICE MANUAL Fig. 3-24 2.3.2 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.) Toner sensor (Light emission) Fig. 3-25 3-23 Toner sensor (Light reception)
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HL
-1850/1870N
SERVICE
MANUAL
2.3
Sensors
2.3.1
Cover
sensors
Detect
opening
and
closing
of
the
front
cover.
Shutter
arm
C
MP
sensor
PCB
assy
Fig.
3-24
2.3.2
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.)
Toner
sensor
(Light
reception)
Toner
sensor
(Light
emission)
Fig.
3-25
3-23