Sharp JX-8200 Service Manual page 33

SHARP SERVICE MANUAL JX8200SM [6] EXTERNAL VIEW AND INTERNAL STRUCTURE
B. Scanning unit section
No. Part name
1 Mirror
2 Laser beam sensor lens
Laser beam sensor
3
4 Laser diode
5 Laser control PWB
6 Collimator lens
7 Scanning mirror unit
8 Filter
9 fθ lens (No. 1)
fθ lens (No. 2)
10
11 Laser beam sensor mirror
10
1
11
9
Radiates laser beams to the OPC drum.
Leads the reference laser beam (scanning start) to the laser beam sensor.
Detects the laser beam reference position (scanning start position).
The output of this sensor serves as the reference of the print left margin.
Emits laser beams.
Turns on/off laser beams, and controls the power.
Makes the light emitted from the laser diode be parallel beams and send the beams to the scanning mirror.
The six rotating mirrors scan the laser beams to form the line image.
Prevents laser beams from being reflected.
Corrects the pitch and the form of laser beams.
Without this correction, the pitch and the form of laser beams may be deformed at the center and the edges
of the OPC drum.
Guides the reference laser beams (scanning start) to the laser beam sensor lens.
3
8
2
5
7
Function, operation
6 – 6
4
6