Laser Emission Timing; Laser Emission Area - Epson EPL-6200 Service Manual

EPSON EPL-6200/EPL-6200L

2.2.1.3 Laser Emission Timing

When the Ready signal is detected upon passage of a certain period of time after issue
of the printing start signal, the Laser ON signal is output from the Mechanical Control
Board. (See "Figure 2-9")
Upon issue of the Laser ON signal, the laser beam is forcibly emitted. The laser
beam, via the polygon mirror → G1 lens → SOS mirror, strikes the SOS sensor to
issue the SOS signal.
This SOS signal unifies the timing of the laser emission for every line of main
scanning.

2.2.1.4 Laser Emission Area

Main Scanning Direction (See "Figure 2-10")
Printing start timing with laser is such that the printing start position is
determined by the main scanning printing start signal (/HSYNC) output from
the Mechanical Control Board and by the paper width.
The laser emission area is determined by the paper size. However, the 4-mm
width area at each of right and left edges is a no-image area.
Sub Scanning Direction
Printing start timing with laser is such that the printing start position is
determined by the sub scanning printing start signal (/TOD) output from the
Mechanical Control Board and by the paper length.
The laser emission area is determined by the paper size. However, the 4-mm
width area at each of the head and tail edges is a no-image area.
Operating Principles
SOS Mirror
G1 Lens
SOS Sensor
Description of Mechanisms
Figure 2-9. Laser Emission Timing
Figure 2-10. Laser Emission Area
Revision A
Polygon Mirror
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