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MX-7000N LSU SECTION i – 2
2. Operational descriptions
A. Outline
Converts the image data (has been sent by way of PCU from the
image processing circuit) to laser beam, and irradiates to the OPC
drum surface.
The LSU unit is composed of the primary system (including optical
elements such as lasers and the polygon mirror and the mirror
which assures the optical path) and the scan system (which
includes the optical elements including the polygon mirror and the
mirror which assures the optical path).
By the once scanning, black laser LD sends two laser beams of
BK1 and BK2 at same time for high-speed print.
The interval in the sub-scanning direction of two laser beams is
42.3
image processing circuit) to laser beam, and irradiates to the OPC
drum surface.
The LSU unit is composed of the primary system (including optical
elements such as lasers and the polygon mirror and the mirror
which assures the optical path) and the scan system (which
includes the optical elements including the polygon mirror and the
mirror which assures the optical path).
By the once scanning, black laser LD sends two laser beams of
BK1 and BK2 at same time for high-speed print.
The interval in the sub-scanning direction of two laser beams is
42.3
µ, also interval at image surface is 70 µ. The interval in the
paper feed direction of two laser beams is 70
µ by electrically con-
trolled.
Since interval of the laser beams is adjusted at shipping, adjust-
ment about that is not required at the later.
Since interval of the laser beams is adjusted at shipping, adjust-
ment about that is not required at the later.
B. Composition
(1) Primary system
(2) Scan system
(3) polygon motor
C. Outline of LSU specifications
Signal
Name
Function/Operation
LSS_BK
LSU shutter solenoid BK
Opens/closes the shutter of the LSU (BK)
LSS_CL
LSU shutter solenoid CL
Opens/closes the shutter of the LSU (CL)
LSUFM
LSU cooling fan motor
Cools the polygon motor.
PGM
Polygon mirror motor
Reflects the laser beams at constant-speed rotating.
TH1
LSU therminstor 1
Measures the temperature in LSU.
TH2
LSU therminstor 2
No.
Name
Function/Operation
1
LD PWB (K)
Controls laser beam flashing and the output value.
2
LD PWB (C)
3
LD PWB (M)
4
LD PWB (Y)
5
Cylindrical lens
Collects the laser beams, and focuses it.
6
f
θ lens 1
7
f
θ lens 2
8
Reflection mirror
Secures the path for laser beams.
9
Cylindrical lens
Collects the laser beams, and focuses it on the OPC drum.
10
Collective lens for BD
Condenses the laser beam to the BD PWB.
11
BD PWB
Detects the timing for starting laser scanning.
12
LSU CNT PWB
Laser beams are controlled and the polygon motor control signal is generated according to the
PCU PWB control signal and image data.
PCU PWB control signal and image data.
13
OPC drum
Forms electrostatic latent images according to laser beams.
Model
Number
of mirror
surface
Rotating speed
Bearing
Model of 55 sheets
7 surfaces
Color :
Monochrome :
Monochrome :
35028 rpm
30371 rpm
30371 rpm
AIR
Model of 62 sheets
Model of 70 sheets
Model of 70 sheets
Color :
Monochrome :
Monochrome :
35028 rpm
35939 rpm
35939 rpm
Effective scan width:
307 mm
Resolution:
600 dpi
Beam diameter:
Main scan = 50 to 65
µm, Sub scan = 60 to 75 µm
Laser power:
Max. 0.8 mW
LD wavelength:
770 to 800 nm
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