Brother International HS-5300 Service Manual - Page 44

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2.5 Sensors The printer has the following sensors. Paper empty sensor Paper regist solenoid 2nd PF solenoid Media sensor o )i\ Pre-heat platen thermistor Heat platen thermistor Quentch platen thermistor 1st PF solenoid Encoder Maintenance paper empty switch . Paper eject Cover open switch sensor Paper width sensor Cam home position switch Fig. 2.20 (1) Paper empty sensor (PFS) The paper empty sensor is placed adjacent to the regist roller and detects the top edge of the paper fed by the paper feed roller. If the paper feed sensor cannot detect the top edge of the paper, it is handled as either a miss-pick or paper empty. After the top edge of the paper is detected, the paper feeding amount to correct skewing and the timing to start rotating the regist roller are calculated. (2) Media sensor (MED) The media sensor is placed between the regist roller and the PA roller. This is used to detect whether the fed media is paper or an OHP film. Depending on the type of the media, the platen temperature is controlled. (3) Paper width sensor (PW) The paper width sensor is placed on the carriage and detects width of the fed paper to prevent printing onto the platen. (4) Encoder (ENC) The encoder is placed on the carriage and detects the carriage position using the encoder strip to control the printing process. (5) Paper eject sensor (POS) 11-25

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2.5
Sensors
The
printer
has
the
following
sensors.
Paper
empty
sensor
Media
sensor
Pre
-heat
platen
thermistor
Heat
platen
thermistor
Paper
regist
solenoid
2nd
PF
solenoid
1st
PF
solenoid
Encoder
.
Fig.
2.20
o
)i\
Paper
eject
sensor
Paper
width
sensor
Cam
home
position
switch
Quentch
platen
thermistor
Maintenance
paper
empty
switch
Cover
open
switch
(1)
Paper
empty
sensor
(PFS)
The
paper
empty
sensor
is
placed
adjacent
to
the
regist
roller
and
detects
the
top
edge
of
the
paper
fed
by
the
paper
feed
roller.
If
the
paper
feed
sensor
cannot
detect
the
top
edge
of
the
paper,
it
is
handled
as
either
a
miss
-pick
or
paper
empty.
After
the
top
edge
of
the
paper
is
detected,
the
paper
feeding
amount
to
correct
skewing
and
the
timing
to
start
rotating
the
regist
roller
are
calculated.
(2)
Media
sensor
(MED)
The
media
sensor
is
placed
between
the
regist
roller
and
the
PA
roller.
This
is
used
to
detect
whether
the
fed
media
is
paper
or
an
OHP
film.
Depending
on
the
type
of
the
media,
the
platen
temperature
is
controlled.
(
3
)
Paper
width
sensor
(PW)
The
paper
width
sensor
is
placed
on
the
carriage
and
detects
width
of
the
fed
paper
to
prevent
printing
onto
the
platen.
(4)
Encoder
(ENC)
The
encoder
is
placed
on
the
carriage
and
detects
the
carriage
position
using
the
encoder
strip
to
control
the
printing
process.
(
5
)
Paper
eject
sensor
(POS)
11-25