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When you banding vertical do you mean Across paper feed direction OR With paper feed direction?
If its across the feed direction the chances are thje issue remains with the individual printhead, Print out a quality maintenance print to find which Printhead is not working as well as wanted, then replace ( or clean using the plotters control panel under image maintenance.
Errors along the feed direction can be down to Software/ Main Pca /
try to change the color ink. horizontal banding (the pink or other color lines appearing means horizontal banding) when there is a problem on one of the heating element of the printer head. since almost all canon printers have head built in the inks, replacing the faulty ink will solve the problem. if not then the controller of printhead on the carriage and mainboard needs to be checked.
When a couple of deep cleaning cycles don't improve your photos, it's time for a new printhead. Some nozzles may be burned out. The printhead is part #
QY6-0076-000 it runs nearly $100.00 but is the only way to restore quality printing.
It sounds like you need a new purge assembly, that's the unit on the right where the printhead parks. It does the cleaning and also primes the printhead during printing, the ink can clog in the tubes and pumps and if you are printing photos, I would replace it before wasting any more photo paper.
open printing preferences and click on maintenance. Run the print head alignment utility. Sometimes this will remove the horizontal banding. I had this same problem and had to uninstall the printer and reinstall just like it was new, running the alignment feature before it was corrected. Worked ok for a few days then started again. I assumed that the printhead is bad. To costly to repair and bought a new printer.
Possible printhead issue. Reseat the cartridges. Make sure that you are using epson genuine cartridges. Clean the printhead if the nozzle check pattern has gaps, breaks or missing colors. To help you find an epson certified servicer near to your area, please log on to epson.com.