Brother HL-1020 Service Manual page 218

Definitions of Warnings, Cautions, and Notes
The following conventions are used in this User's Guide:
Warning
Indicates warnings that must be observed to prevent possible
personal injury.
Caution
!
Indicates cautions that must be observed to use the printer properly or
prevent damage to the printer.
Note
Indicates notes and useful tips to remember when using the printer.
To Use the Printer Safely
Warning
After you have just used the printer, some internal parts of the
printer are extremely hot. When you open the top cover of the
printer, never touch the shaded parts shown in the following
illustration.
Warning
There are high voltage electrodes inside the printer. Before cleaning
the printer, make sure to turn off the power switch and unplug the
power cord from the power outlet.
High Temperature
Inside the Printer
Turning off the Switch and Unplugging the Printer