Over the past weeks the black print has been slowly getting fainter and fainter. (The faintness is more pronounced on the right side of the page than on the left.) Color printing appeared to be OK, although not as vibrant as it once was.
I assumed the problem was that the black toner cartridge was running out of toner, even though the Utility (I'm running Mac OS 10.13.5 High Sierra) said all four toner cartridges are full. This morning I replaced the black toner cartridge and now the printer will not print black at all. Printing a test page shows the color part of the image, but no black. Printing one of my own documents prints the logos and other color text on the page, but none of the black text.
I downloaded the latest drivers from the Canon web page and reinstalled the printer drivers. That did not change anything.
Any ideas? Is it time to purchase a replacement for the Canon?