Brother International MFC-7050C Service Manual - Page 15

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2.1.1 Document feeding and ejecting mechanism To feed and eject documents, the scanner motor rotates counterclockwise. It rotates the sun gear 19/55 clockwise so that the planet gear 23 ASSY transmits the torque to the gear 19/47 and its gear train. After completion of paper ejection, the scanner motor rotates clockwise in order to disengage the planet gear 23 ASSY from the gear 19/47. This allows you to pull back a document if jammed in the backward direction. Document feed roller ASSY Document ejection roller ASSY 0 0 0 to) Separation roller ASSY Document feed roller gear Scanner motor gear Planet gear 23 ASSY Document ejection roller gear 27 Separation roller gear Sun gear 19/55 Gear 64 Gear 19/47 Scanner motor (Viewed from the right) 2.1.2 Scanner The scanner uses a contact image sensor (CIS) unit which consists of an LED array illuminating documents, a self-focus lens array collecting the reflected light, a CIS PCB carrying out photoelectric conversion to output picture element data, and a cover glass on which a document advances. When the document passes between the document pressure bar and the cover glass, it is scanned. III - 4

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2.1.1
Document
feeding
and
ejecting
mechanism
To
feed
and
eject
documents,
the
scanner
motor
rotates
counterclockwise.
It
rotates
the
sun
gear
19/55
clockwise
so
that
the
planet
gear
23
ASSY
transmits
the
torque
to
the
gear
19/47
and
its
gear
train.
After
completion
of
paper
ejection,
the
scanner
motor
rotates
clockwise
in
order
to
disengage
the
planet
gear
23
ASSY
from
the
gear
19/47.
This
allows
you
to
pull
back
a
document
if
jammed
in
the
backward
direction.
Document
feed
roller
ASSY
Document
ejection
roller
ASSY
0
Document
feed
roller
gear
Scanner
motor
gear
Planet
gear
23
ASSY
Document
ejection
roller
gear
27
Sun
gear
19/55
0
0
to)
Gear
19/47
Gear
64
Scanner
motor
(Viewed
from
the
right)
2.1.2
Scanner
Separation
roller
ASSY
Separation
roller
gear
The
scanner
uses
a
contact
image
sensor
(CIS)
unit
which
consists
of
an
LED
array
illuminating
documents,
a
self
-focus
lens
array
collecting
the
reflected
light,
a
CIS
PCB
carrying
out
photoelectric
conversion
to
output
picture
element
data,
and
a
cover
glass
on
which
a
document
advances.
When
the
document
passes
between
the
document
pressure
bar
and
the
cover
glass,
it is
scanned.
III
-
4