Before disassembling or assembling parts of the main machine and peripherals, make sure that the power cord of the main machine is unplugged.
The wall outlet should be near the machine and easily accessible.
Note that some components of the machine and the paper tray unit are supplied with electrical voltage even if the main power switch is turned off.
If any adjustment or operation check has to be made with exterior covers off or open while the main switch is turned on, keep hands away from electrified or mechanically driven components.
The inside and the metal parts of the fusing unit become extremely hot while the machine is operating. Be careful to avoid touching those components with your bare hands.
To prevent a fire or explosion, keep the machine away from flammable liquids, gases, and aerosols.