Canon LBP7210Cdn Manual page 202

<Replace Cartridge>
<Check Cartridge>
<Insert Cartridge>
job.
When any of the toner cartridges (other than black) has
reached the end of its life, you can print only in black and
white.
Replace the toner cartridge of the indicated color with a new
one.
The printer stops printing.
Toner cartridges with print quality that cannot be guaranteed
or used toner cartridges that have reached their lifetime may
be inserted.
Continuing to use these cartridges may cause a malfunction,
so replacing these cartridges with new cartridges is
recommended.
The printer stops printing.
Install the toner cartridges in the correct positions.