Epson AcuLaser C9200N Service Manual page 39

EPSON AcuLaser C9200N
LASER SHUTTER MECHANISM
There is a shutter mechanism provided to prevent the PH from being
contaminated with foreign matter such as dust when the front cover is opened,
or prevent the emission laser from leaking outside for any reason.
The Shutter operates relative to the removing and inserting Photoconductor
Unit because PH Unit is not exposed concerning the layout of the unit when
Photoconductor Unit is inserted. The shutter opens by pressing shutter guide at
insertion of the Photoconductor Unit, and closes at de-installation of the
Photoconductor Unit.
Shutter
Shutter Guide
Figure 2-6. Laser shutter mechanism
OPERATING PRINCIPLES
LASER EMISSION AREA
Main scan direction (CD)
Sub scan direction (FD)
Start signal
for main
scan print
Void width: 4.2 mm/
0.165 inch
Void width: 4.2 mm/
0.165 inch
Operating Principle of Main Unit Mechanism
The print start position is determined by the start signal for main scan
print and the range of the paper size output from the Mechanical
Control Board (PWB-P).
The laser emission area is determined by the paper size. The area of 4 mm/
0.157 inch on both edges of the paper is, however, the void image area.
The print start position is determined by the writing image signal and the
range of the paper size output from the Mechanical Control Board (PWB-P).
The laser emission area is determined by the paper size. The area of 4.2
mm/0.165 inch on the leading and trailing edges and 4 mm/0.157 inch
on both the side edges of the paper are, however, the void image area.
Void width: 4 mm/0.157 inch Void width: 4 mm/0.157 inch
Figure 2-7. Laser emission area
Revision D
Writing
image
signal
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