User`s guide

Basics LaserWriter Safety - 40
LaserWriter Safety
Unplug Printer
LaserWriter printers operate at high voltages. To prevent
serious injury, always switch off the printer and unplug the
AC power cord before servicing the printer.
Laser Beam Safety
Never disconnect the beam-detect cabling or laser shutter
when the printer is switched on. Also be careful not to place
screwdrivers or other shiny objects in the path of the laser
beam. The reflected laser beam, though invisible, can
permanently damage your eyes.
Never remove the cover of a laser/scanner assembly,
whether the printer is powered on or not.