Canon BJC-250 - Manual (Page 63)

Do not manually move the mechanism that houses the BJ cartridge. Attempting to
move the BJ cartridge holder will damage the printer.
Be sure there is no gap between the BJ cartridge and the cartridge holder. When
secure, the BJ cartridge makes contact with the circuit board inside the cartridge
holder.
8
Close the
front cover.
When ever you turn off the printer, the BJ cartridge moves to the home position on the
right and caps itself. If you unplug the printer while it is printing (or if you turn off a
power strip to which the printer is connected), or if you manually move the cartridge
holder from the home position, the BJ cartridge will not be capped and it may dry out.
If you installed a new BJ cartridge, the printer automatically cleans the print head. If you
need to initiate the print head cleaning, see page 4-6.