Canon rep advised. All feed tubes should be full. Fix: clean heads. carry out a full flush. visual check of tubes, if full operate nozzle check.
Observe print output, all now should be as normal. ( Problem solved).
Want to reply to this thread or ask your own question?
You'll need to choose a username for the site, which only take a couple of moments. After that, you can post your question and our members will help you out.