I have a canon ix 6820. The larger black link stopped working. I removed the print head and flushed it out. This has worked for me in the past. I then ordered a new print head. I swapped ink cartridges and still nothing. I ran multiple cleaning options during all of these changes, but nothing worked. Any ideas?
If you have replaced the print head and the black is still not printing, it would point to a problem with the printer's hardware. You can try removing the ink tanks and check on the inside right where the print head normally sits and check for any obstructions. If it is clear, the printer would need repair. In this situation, you an use the link HERE to log into your My Canon account to see what options are available.