Ros Control; Scanner Motor Rotation; Light Quantity Control - Epson ColorPage EPL-C8000 Service Manual

EPSON EPL-C8000

2.7.4 ROS Control

2.7.4.1 Scanner Motor Rotation

The following table defines the Scanner Motor Rotation ON/OFF control
in the printer modes.
Table 2-3. Scanner Motor Rotation Control
Mode
WARM-UP OFF
READY OFF
PRINTING ON
LIGHT SLEEP OFF
DEEP SLEEP OFF
DIAG TEST ON in the following case:
• Diagnostic tool: Test print
• Diagnostic tool: Executing ROS_MOT in Digital
Output Test
ERROR OFF
NOTE: The Scanner Motor rotates when the PMSTT (Printing/Status Control) is
executed in any mode.
Chapter 2 OPERATING PRINCIPLES
Scanner Motor: ON/OFF

2.7.4.2 Light Quantity Control

Image data is input to the ROS (LD Assembly) as electrical signals.
(The data is represented by the high/low voltage of the electrical
signals). The LD Assembly converts the electrical signals into light
signals. (A light signal represents data by turning the laser beam on/off.)
To obtain a correct electrostatic latent image, the LD Power for the laser
light, the optical system (lens, etc.), and the drum sensitivity must be
stable. Based on the feedback from the electric potential control (See
Section 2.7.5.1 Electric Potential Control), the LD Assembly monitors
and controls the laser light quantity to obtain a correct electrostatic
latent image. This control is called APC (Automatic Power Control).
Rev. B
2-48