Lexmark 5021-0XX - Manual (Page 66)

1-40 Service Manual
5021-0XX
Details of the optical system
In the optical system process, the printer utilizes a semiconductor
laser diode as a light source. This laser diode is controlled by fast
switching which matches the transmitted image data (video signal).
The generated laser light scans the OPC belt through a polygon
mirror and lens. The electrostatic latent images are formed on the
OPC belt.
The Optical printhead unit consists of following parts:
No. Description
1
PD: photo detector
2
Polygon mirror: hexahedral mirror that reflects the laser
beam
3
Cylinder lens: laser beam condenser
4
Laser unit: laser diode light emitting source
5
LDC: laser diode control circuit
6
BTD mirror: beam timing detector mirror to guide the
laser beam to PD
7
Scanner motor: rotates the polygon mirror