Canon BJ-20 User Manual page 18

Cautions
Use only the supplied AC adapter. If, however, you plan to operate the
printer in another country, check the voltage of the country and , if
necessary, obtain the appropriate AC adapter (with the correct voltage)
from a Canon authorized dealer in that country.
The supplied AC adapter is intended for indoor use only.
To avoid causing a short circuit, do not attach any metallic object to
the connector on the AC adapter when the adapter is plugged into an
electrical outlet.
Always turn off the printer when it is not in use.
Before unplugging the adapter, always turn off the printer first;
otherwise the print head cannot be recapped correctly. If such mistake
occurs, plug the adapter back into the AC outlet, then turn the printer
on and off. Finally, unplug the adapter.
Whenever the AC adapter is plugged into an electrical outlet, current
flows inside the adapter. Therefore, unplug the adapter if the printer is
not used for an extended period of time.