Ros Light Intensity Control - Epson AcuLaser C2800 Service Manual

AcuLaser C2800/C2800D/C3800/C3800D
The following table shows the on/off status of Paper Size Switch in the SWITCH
ASSY SIZE according to the paper size.
Paper Size Switches are referred to as "SW2", "SW1", and "SW0"
C H E C K
P O I N T
from the top.
Table 2-2. Paper Size Control
Paper Size Switch
Paper Size
SW2 SW1
LEGAL14" (SEF) ON ON
LEGAL13" (SEF) ON ON
EXECUTIVE (SEF) ON OFF
B5 (SEF) ON OFF
A4 (SEF) OFF ON
LETTER (SEF) OFF OFF
A5 OFF ON
No cassette OFF OFF
ON: Paper Size Switch is pressed by the actuator.
OPERATING PRINCIPLES
SW0
ON
OFF
ON
OFF
ON
ON
OFF
OFF Figure 2-40. Paper Size Switch

2.7.2 ROS Light Intensity Control

An image data converted to electric signals (expresses image data by ups and downs of
voltage) is sent to the laser diode in the ROS ASSY, and the laser diode converts the
electric signals to the light signals (controls on/off of the laser beam).
The laser diode monitors and controls the light intensity of the laser beam to create
stable electrostatic latent image without being affected by the fluctuations of the laser
beam intensity, optical system (such as lenses), and drum sensitivity.
The ROS of this printer has laser diodes for each yellow, magenta, cyan, and black, and
the light intensity for each color is automatically adjusted.
Control
Revision C
61
Confidential