Brother International MFC-7050C Service Manual - Page 115

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3.5 Sensor Operational Check ■ Function This function allows you to check that the following 13 sensors operate correctly. - Document front sensor - Document rear sensor - Cover sensor Registration sensor Hook switch Carrier home position sensor - Ink empty sensor ■ Operating Procedure (1) Press the 3 and 2 keys in this order in the initial stage of the maintenance mode. The equipment sounds 1100 Hz and 400 Hz tones cyclically through the following volumes for testing the speaker: 1100 Hz Low -> Medium -> High OFF OFF L 400 Hz High

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3.5
Sensor
Operational
Check
■
Function
This
function
allows
you
to
check
that
the
following
13
sensors
operate
correctly.
-
Document
front
sensor
-
Document
rear
sensor
-
Cover
sensor
Registration
sensor
Hook
switch
Carrier
home
position
sensor
-
Ink
empty
sensor
■
Operating
Procedure
(1)
Press
the
3
and
2
keys
in
this
order
in
the
initial
stage
of
the
maintenance
mode.
The
equipment
sounds
1100
Hz
and
400
Hz
tones
cyclically
through
the
following
volumes
for
testing
the
speaker:
1100
Hz
Low
—>
Medium
—>
High
OFF
L
400
Hz
High
<—
Medium
<—
Low
OFF
If
the
sensors
are
ON
as
listed
below,
the
LCD
will
show
"FRRECVHKENCREP"
which
can
be
switched
by
pressing
the
Start
key.
Given
below
is
the
relationship
between
the
LCD
indication,
sensor
name
and
sensor
status.
LCD
Sensors
Sensor
signal
ON
FR
RE
CV
HK
EN
CR
EP
Document
front
sensor
Document
rear
sensor
Cover
sensor
Hook
switch
Registration
sensor
Carrier
home
position
sensor
Ink
empty
sensor
No
document
detected.
No
document
detected.
Top
cover
closed.
On
-hook
state.
No
recording
paper
detected.
Carrier
placed
in
the
home
position.
No
reflection
light
received
(since
no
paper
is
inserted),
which
is
equivalent
to
detecting
of
a
printed
ink
-empty
mark.
(2)
Change
the
detecting
conditions
and
check
that
the
displayed
letters
disappear.
For
example,
insert
a
document
through
the
document
front
sensor
and
check
that
the
"FR"
disappears.
(3)
To
stop
this
operation
and
return
the
equipment
to
the
initial
stage
of
the
maintenance
mode,
press
the
Stop
key.
V
-
19