Brother International HL-3400CN Service Manual - Page 74

Scanning, System

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HL-3400CN SERVICE MANUAL 1.5 Scanning System This printer employs a semiconductor laser diode as a light source. This laser diode is switched according to the transmitted image data (video signal). The generated laser light scans over the OPC belt through a polygon mirror and lens, by which method electrostatic latent images will be formed on the OPC belt. (1) Structure of the Scanning System (Refer to Fig.4-24.) The scanner unit is located as shown in Fig.4-8. The scanner unit consists of the following parts; D Laser unit: Light emitting source incorporating a laser diode. • Cylinder lens: Condenser for the laser beam. (i) Polygon mirror: Hexahedral mirror for scanning the laser beam. ® F-0 lens: Focus lens for the laser beam. © Scanner motor: 6 Mirror: Motor to rotate the polygon mirror. Reflecting mirror for the laser beam path. • LDC: ® PD: Laser diode control circuit. Beam detector. • BTD mirror: Beam timing detector mirror to guide the laser beam to the PD sensor. Laser unit box 9 Dust proof glass 4 r- Developer belt Fig. 4-24 4-23

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HL-3400CN
SERVICE
MANUAL
1.5
Scanning
System
This
printer
employs
a
semiconductor
laser
diode
as
a
l
ight
source.
This
laser
diode
is
switched
according
to
the
transmitted
image
data
(video
signal).
The
generated
laser
l
ight
scans
over
the
OPC
belt
through
a
polygon
mirror
and
lens,
by
which
method
electrostatic
latent
images
wi
ll
be
formed
on
the
OPC
belt.
(1)
Structure
of
the
Scanning
System
(Refer
to
Fig.4-24.)
The
scanner
unit
is
located
as
shown
in
Fig.4-8.
The
scanner
unit
consists
of
the
fol
lowing
parts;
D
Laser
unit:
•
Cyl
inder
lens:
(i)
Polygon
mirror:
®
F-0
lens:
©
Scanner
motor:
6
Mirror:
•
LDC:
®
PD:
•
BTD
mirror:
Laser
unit
box
Light
emitting
source
incorporating
a
laser
diode.
Condenser
for
the
laser
beam.
Hexahedral
mirror
for
scanning
the
laser
beam.
Focus
lens
for
the
laser
beam.
Motor
to
rotate
the
polygon
mirror.
Reflecting
mirror
for
the
laser
beam
path.
Laser
diode
control
circuit.
Beam
detector.
Beam
timing
detector
mirror
to
guide
the
laser
beam
to
the
PD
sensor.
Dust
proof
glass
Developer
belt
9
4
r
-
Fig.
4-24
4-23