Hello,
I have a problem, with a very old (but still good in my opinion) Canon printer, IP4200. Recently it has stopped to print black. I've tried "cleaning" and "deep cleaning" options from the printer properties, but it didn't solved the issue. All other colours from the pattern are visible, just the PGBK isn't. I've also tried to clean the printhead with alcohol, but without any success.
Any advice?