NEC NEFAX - 691 B/W Laser Introduction Manual page 11

1.3 Safety Information
1
The laser diode and the scanning polygon mirror are incorporated in the print head
unit.
The print head unit is NOT A FIELD-SERVICEABLE ITEM.
Therefore, the print head unit should not be opened under any circumstances.
Print Head
Laser Aperture of the Print Head Unit
There is a laser aperture at the location shown above, which must NEVER be
viewed directly by the user.
CDRH Regulation
This machine is certified as a Class 1 Laser product under Radiation Performance
Standard according to the Food, Drug and Cosmetic Act of 1990. Compliance is
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