Epson EPL-6200, Service Manual

Page: 75 / 204

EPSON EPL-6200/EPL-6200L Revision A
Operating Principles Description of Mechanisms 75
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.
Figure 2-9. Laser Emission Timing
Figure 2-10. Laser Emission Area
Polygon Mirror
SOS Mirror
G1 Lens
SOS Sensor