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When the printer is not being used, the print-heads slide to their "resting" position,
in order to keep the ink-jets moist, i.e., to NOT dry-out.
Some ink is absorbed into that INK-ABSORBER.
Now, after a few years of usage, that ink-absorber is "full".
Like taking-out the garbage from your kitchen waste-basket when it gets full, and replacing the full waste-basket with an empty waste-basket, it's time to get your printer serviced -- replace the "full" ink-absorber with an "empty" ink-absorber.
Note that CANON printers do not actually "measure" the fullness -- they electronically estimate the fullness, given information about how much you print, and how often you print, and the "density" of the pages that you do print (text is much less dense than colour-photos).
Not all the ink that gets pulled out of an ink-cartridge reaches the paper. Some of the "ink" is "waste". As such, it goes into an "absorber" (a sponge). The electronics inside the printer "predict" when the absorber is getting full, based on the number of pages you print, and the time between printing pages.
So, take your printer to a qualified printer technician.
They will empty the absorber, or replace it,
and "reset" the electronics inside the printer,
to indicate that the absorber has become "empty".
No, Canon does not have this facility. Also mostly greyscale is not light black but rather a mixcture of the 3 primary colours. You should have a reset/resume button on the printer - hold this in for a slow 5 seconds to de-activate ink warnings per cartridge that is giving alarms. Proceed carefully and only print text that is black so that the colour printheads do not burn out.
The waste ink absorber is a piece of sponge that (as its name implies) absorbs waste ink. On many Canon printers it an be removed if you are fairly dextrous. Wash it out and dry it and then refit. It may well be a fiddle but it will go back in.
The difficult bit is resetting the printer so that it knows the absorber is empty.
Do a google on resetting the waste ink warning for your particular printer (it's not the same for every Canon).
It's done with various combinations of button pressing and light sequences and generally works first time (though one of mine took 4 or 5 goes before it actually reset).