Sharp MX-4100N Service Manual page 468

Signal name Name
CCFM Process air inlet fan motor
PGM Polygon motor
LSU_FAN LSU cooling fan motor
LSUSS LSU shutter solenoid
No. Name
1 LD PWB
2 Cylindrical lens
3 fθ lens 1
4 fθ lens 1
5 Reflection mirror
6 Cylindrical lens
7 Collective lens for BD
8 BD PWB
9 LSU PWB
10 LSU thermistor
2. Operational descriptions
A. Outline
Image data sent from the image process circuit through the PCU
are converted into laser beams which are radiated to the surface of
the OPC drum.
In this model, 2-laser system is employed where 2-laser diodes for
each color are radiated. The LSU unit is composed of the optical
element from laser to the polygon mirror, the primary system
including the mirror which assures light path, and the main scan-
ning system.
B. Composition
(Primary system)
Cools charger section of the process.
Reflects the laser beams at constant-speed rotating.
Cools the section LSU.
Opens/closes the LSU shutter.
Controls flashing of laser beams and the output values.
Converges laser beams to focus.
Laser beams are refracted so that the laser scanning speed at the both ends of the OPC drum is the same as
that at the center.
Assures the optical path for laser.
Collects the laser beams, and focuses it on the OPC drum.
Converges laser beams to the BD PWB.
Detects the timing for starting laser scanning.
Laser beams are controlled and the polygon motor control signal is generated according to the PCU PWB
control signal and image data.
Measures the temperature in LSU.
(Scanning system)
Main scanning direction
MX-5001N LSU SECTION H – 2
Function/Operation
Function/Operation
LD1 LD2 LD2 LD1
Scanning LD2
direction
LD1
BK C M Y
LD1 LD2 LD1 LD2
Rear
Scanning
direction
LD2
LD1
Front