Epson ActionLaser 1600, Service Manual

Page: 69 / 181

Principles of Operation
L a s e r E x p o s u r e
Laser exposure is the process of creating an invisible static electric image on the
PC drum with laser beams emitted from the optical unit. The mirror motor
(scanner motor) rotates the six-sided mirror counterclockwise to produce a laser
light scan. (One side of the mirror produces one scan.) The SOS (start of scan)
sensor detects the laser rays from the SOS mirror and outputs the SOS signals to
make the starting position of each line of the image uniform.
F i g u r e 2 - 6 . L a s e r E x p o s u r e
D e v e l o p m e n t
Development is the process of creating a toner image on the PC drum by applying
toner to the invisible static electric image. The doctor blade spreads a thin, even
coat of toner over the flexible sleeve. When the toner passes between the doctor
blade and the flexible sleeve, it becomes negatively charged. The flexible sleeve
transports toner to the surface of the PC drum and controls the development with
the developing bias voltage.
No positivly charged toner is transported, and the doctor blade is charged to
prevent printing from having a foggy background.
Figure 2-7. Development
EPSON ActionLaser 1600 Service Manual 2-11