Epson AcuLaser C8500 Service Manual page 9

Laser Beam
The printer has two interlock switches: the Front Cover Switch R and
the Top Cover Switch. The purpose of these switches is to turn off the
laser beam emission if any of the printer covers have been opened; this
protects the user or service personnel from exposure to the laser beam
from the ROS Assembly.
A laser beam may be emitted during a maintenance operation. Do not
turn on these interlock switches simultaneously under any
circumstances except in a normal operation.
Do not expose yourself to the laser beam to prevent
W A R N I N G
injury (blindness).
Do not open the cover that has the laser beam
warning label.
If you disassemble or assemble the printer, turn off
the power.
If you need to work on the printer with power applied,
strictly follow the instructions in this manual.
If you have to activate the printer while pressing the
Front Cover Switch R by hand or with a tool, remove
the Top Cover. (Do not turn on these interlock
switches simultaneously under any circumstances
except in a normal operation.)
Understand how the laser beam functions and take
maximum precautions not to injure yourself or anyone
around you.
NOTE: The laser beam has a narrower frequency band and more
coherent phases than any other light (sunlight, electric light).
It has excellent monochromaticity and convergence. A thin
laser beam reaches long distances. Because of its
convergence characteristic, the laser beam converges into
one point, causing high density and high temperature. A
laser beam is harmful to the human body.
NOTE: The laser beam in this printer is invisible.