Alignment could fail due to missing black lines, and on this model, it would ask you to do alignment again.
Missing lines in the clean printhead (or printer quality report) means some jets on the printhead is blocked. If clean printhead didn't resolve the issue, the clean printhead process asks if you want do level 2 clean, etc. if you already done the process a few times and still there are missing lines, you will need to replace the printhead.
Missing lines in the clean printhead (or printer quality report) means some jets on the printhead is blocked. If clean printhead didn't resolve the issue, the clean printhead process asks if you want do level 2 clean, etc. if you already done the process a few times and still there are missing lines, you will need to replace the printhead.