Ricoh M281 Series Service Manual page 579

7.3 LASER UNIT
The charged surface of the drum is scanned by the laser beam from the laser unit. The polygon
motor rotates to reflect the laser beam over the drum. Various lenses and mirrors are housed in
the laser unit, to adjust the diameter of the laser beam, and focus it on the drum surface.
No. Name
1 Polygon motor
2 f-theta main lens
3 Dust shield glass
SM
No. Name
4 Unit base
5 Unit cover
6 Mirror
7-15
Laser Unit
D255/D256/M281/M282