Epson AcuLaser C1900 Service Manual page 16

LASER SAFETY LABEL
A laser safety label is attached to the outside of the machine as shown
below.
LASER CAUTION LABEL
A laser caution label is attached to the inside of the machine as shown
below.
PRECAUTIONS FOR HANDLING THE LASER EQUIPMENT
When laser protective goggles are to be used, select ones with a
lens conforming to the above specifications.
When a disassembly job needs to be performed in the laser beam
path, such as when working around the printerhead and PC Drum,
be sure first to turn the printer OFF.
If the job requires that the printer be left ON, take off your watch and
ring and wear laser protective goggles.
A highly reflective tool can be dangerous if it is brought into the laser
beam path. Use utmost care when handling tools on the user's
premises.