Laser Unit
SM 6-3 D014/D015/D078/D079
Detailed
Descriptions
6.2 LASER UNIT
There is an LD unit for each color, and each LD unit uses a two-beam system. A
photodiode (PD) in each LD unit detects the light emitted from the LD unit. The output of
the PD is fed back to the LD control board. The LD control board uses this information to
control the amount of light to make sure that it remains at the correct level.
6.2.1 DUAL BEAM WRITING
In each LD unit, two beams move across the drum in the main scan direction.
The use of two beams:
Makes the machine print faster.
Reduces the number of turns of the polygon mirror for a page to prolong the service life
of the motor.
Reduces the amount motor noise.
The beam pitch is fixed at 600 dpi and is not adjustable.
6.2.2 LD SAFETY SWITCHES
To ensure the safety of customers and customer engineers, two switches inside the cover
prevent the laser beams from switching on accidentally. When the front cover is open, the
+5V line connecting each LD driver on the LD control board is disconnected.
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