Exposure Process - Epson AcuLaser C1900 Service Manual

EPSON AcuLaser C1900/AcuLaser C900

2.4.3 Exposure Process

The laser beam from the print head creates an electrostatic latent image on the OPC drum
surface.
SUB SCANNING DIRECTION (VERTICAL SCANNING DIRECTION)
When the printer receives the PRINT signal, the polygon motor (M3) and the main motor
(M1) operate, and paper feeding is started.
Printing in the sub scanning direction is started when the belt location detection sensor is
turned on.
MAIN SCANNING DIRECTION (HORIZONTAL SCANNING DIRECTION)
Upon receiving the SOS sensor signal from the Laser Control Board, the printer starts
printing in the main scanning direction.
PRINTABLE AREA
Figure 2-10 at right shows the printable area in the sub scanning direction and the main
scanning direction.
Operating Principles
OPC Drum
/HSYNC
/VIDEO
Loss width:4 mm
Loss width:4 mm
Description of Mechanisms
Polygon Motor (M3)
Figure 2-9. Exposure Control
/VIDEO /TOD
MAIN SCANNING DIRECTION:208 mm
Figure 2-10. Printable Area
Revision B
80 ms
100