Optical Section; Laser Scanner Section - Olivetti PG L2140 Service Manual

2-1-4 Optical section

(1) Laser scanner section

The charged surface of the drum is then scanned by the laser beam from the laser scanner unit. The laser
beam is dispersed as the polygon motor (PM) revolves to reflect the laser beam over the drum. Various lenses
and mirror are housed in the laser scanner unit, adjust the diameter of the laser beam, and focalize it at the
drum surface.
1. Polygon motor (PM)
2. fθ main lens
3. Direction change mirrer
EPWB
YC15-3
YC15-4
YC15-5
YC16-2
YC16-3
YC16-4
YC16-5
YC16-6
YC16-7
YC16-8
YC16-9
YC16-10 VCONT2
Y 114940 - 1
3 4
Figure 2-1-13 Laser scanner unit (LSU)
PLGDRN
PLGRDYN
POLCLK
VDATA1P
VDATA1N
VDATA2P
VDATA2N
SAMPLEN1
SAMPLEN2
OUTPEN
VCONT1
Figure 2-1-14 Laser scanner unit block diagram
Service Manual
2 5 1
4. LSU dust shield glass
5. LSU base
6. LSU cover
3
2 PM
1
Laser light
Laser
diode
APCPWB
YC2-2
Drum
-1-7
6
Photo
sensor
PDN
PDPWB