The Canon Printer Error 5B00, also known as the "waste ink absorber full" error, can be resolved using the following steps:
Reset the Printer:
Turn off the printer and unplug it from the power source. Wait for a few minutes and then plug it back in. Turn on the printer. This may help reset the error.
Service Mode Reset:
a. Make sure the printer is turned off.
b. Hold down the "Resume" or "Cancel" button (downward arrow icon) while pressing and holding the "Power" button.