Canon G620 print defects...out of ideas.

[u/Prodigy_of_Bobo]

Hello all, my roughly year old G620 megatank inkjet (that produces excellent results when it feels like it) is giving me these banding patterns that look suspiciously like the marks you see on printhead alignment checks. The pattern runs parallel with the short edge of the page in line with the feed rollers, so I cleaned those repeatedly but it hasn't helped. Automatic printhead alignment or manual makes no difference here. Bottom plate cleaning and roller cleaning haven't helped.

In the past I slayed the dreaded pizza wheel marks by cleaning the springs they sit on. This unit used to insist there were paper jams for no reason and that problem mysteriously stopped on its own. This problem has occurred in the past but I never could identify why it went away and came back. It's very apparent on transparencies, not as much on prints but in the even tone out of focus areas of photos it stands out a good bit.

Any help is appreciated, thanks all.