Brother International DCP1000 Service Manual - Page 24

Sensors, Actuators

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3.2.3 Sensors and Actuators This machine has ten sensors: seven photosensors, two thermistors and a mechanical switch as described below. Sensor name Document front sensor Document rear sensor Document tray open sensor Scanner open sensor Registration sensor Paper ejection sensor CCD HP sensor Toner sensor Toner thermistor Heater thermistor Type Photosensor Photosensor Mechanical switch Photosensor Photosensor Photosensor Photosensor Photosensor Thermistor Thermistor Located on Document sensor PCB in the ADF Document tray Control panel PCB Main-fan PCB High-voltage power supply PCB CCD PCB on the CCD unit Toner sensor PCB Heat-fixing unit • Document front sensor which detects the presence of documents. • Document rear sensor which detects the leading and trailing edges of pages to tell the control circuitry when the leading edge of a new page has reached the starting position and when the scan for that page is over. • Document tray open sensor which detects whether the document tray is closed. • Scanner open sensor which detects whether the scanner unit is closed. • Registration sensor which detects the leading and trailing edges of paper, which allows the controller to determine the registration timing and check paper jam. • Paper ejection sensor which detects whether the recording paper goes out of the machine. • CCD HP sensor which detects whether the CCD unit is placed in the home position. • Toner sensor which detects whether there is toner or a toner cartridge is loaded. • Toner thermistor which allows the controller to monitor the ambient temperature of the toner cartridge. • Heater thermistor which allows the controller to monitor the temperature of the heater roller of the fixing unit. These photosensors are a photointerrupter consisting of a light-emitting diode and a light-sensitive transistor. Each of them has an actuator separately arranged as shown on the next page. -.,...-- Actuator's end _ 3-10 Light-emitting Light-sensitive diode transistor

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3.2.3
Sensors
and
Actuators
This
machine
has
ten
sensors:
seven
photosensors,
two
thermistors
and
a
mechanical
switch
as
described
below.
Sensor
name
Type
Located
on
Document
front
sensor
Document
rear
sensor
Photosensor
Photosensor
Document
sensor
PCB
in
the
ADF
Document
tray
open
sensor
Mechanical
switch
Document
tray
Scanner
open
sensor
Photosensor
Control
panel
PCB
Registration
sensor
Photosensor
Main
-fan
PCB
Paper
ejection
sensor
CCD
HP
sensor
Photosensor
Photosensor
High
-voltage
power
supply
PCB
CCD
PCB
on
the
CCD
unit
Toner
sensor
Photosensor
Toner
thermistor
Thermistor
Toner
sensor
PCB
Heater
thermistor
Thermistor
Heat
-fixing
unit
•
Document
front
sensor
which
detects
the
presence
of
documents.
•
Document
rear
sensor
which
detects
the
leading
and
trailing
edges
of
pages
to
tell
the
control
circuitry
when
the
leading
edge
of
a
new
page
has
reached
the
starting
position
and
when
the
scan
for
that
page
is
over.
•
Document
tray
open
sensor
which
detects
whether
the
document
tray
is
closed.
•
Scanner
open
sensor
which
detects
whether
the
scanner
unit
is
closed.
•
Registration
sensor
which
detects
the
leading
and
trailing
edges
of
paper,
which
allows
the
controller
to
determine
the
registration
timing
and
check
paper
jam.
•
Paper
ejection
sensor
which
detects
whether
the
recording
paper
goes
out
of
the
machine.
•
CCD
HP
sensor
which
detects
whether
the
CCD
unit
is
placed
in
the
home
position.
•
Toner
sensor
which
detects
whether
there
is
toner
or
a
toner
cartridge
is
loaded.
•
Toner
thermistor
which
allows
the
controller
to
monitor
the
ambient
temperature
of
the
toner
cartridge.
•
Heater
thermistor
which
allows
the
controller
to
monitor
the
temperature
of
the
heater
roller
of
the
fixing
unit.
These
photosensors
are
a
photointerrupter
consisting
of
a
light
-emitting
diode
and
a
light-sensitive
transistor.
Each
of
them
has
an
actuator
separately
arranged
as
shown
on
the
next
page.
3-10
—
Actuator's
end
.,...--
_
Light
-emitting
Light-sensitive
diode
transistor