Brother HL-3400CN Series - Manual (Page 7)

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Warning
HARMFUL OZONE GAS
Inhalation of an excessive amount of ozone can adversely affect your
respiratory system.
An Ozone Filter is included to reduce ozone exhaust. This filter must
be replaced periodically in accordance with the instructions found in
your user manual.
Warning
If metal objects, water or other liquids get inside the printer, turn the
printer off immediately and unplug the printer. Contact your dealer.
Warning
Do not put consumables such as the Toner Cartridges and the Waste
Toner Pack into a fire. Some consumables may be flammable under
certain conditions.
Warning
Do not look directly at the laser beam light. It might cause damage to
your eyesight. Do not remove or break open the printer’s safety
interlocks.
Warning
Do not run the printer with the Top Cover, Front Cover and Rear
Access Covers open and the interlocks removed.
Warning
Turn off the printer before replacing consumables.
Warning
Do not place any items on the printer.