"the encoder strip just needed to be cleaned with alcohol. The banding will not go away until you get those nozzles back. All your nozzles look stressed due to dry ink or age. Do not change the dampers, that is not the issue. Do some powerful…"
"Not sure where to begin. With that type of nozzle test. It looks like you need a head. So here is what I see wrong in the test:
dirty encoder strip - giving you vertical issues