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Measure the distance between two of the same coloured dots down the page, if it is just over 150mm then it is caused by scratches on the photoconductor drum (this is the only thing that has a 15.4mm circumference). Try printing a black and white only document, only the black dots should appear. Removing the photoconductor and gently polishing the blue drum with a soft cloth can help if the scratches are not too deep, otherwise a new photoconductor is the only route.
Your printer has ink build up inside it. This comes from cleaning cartridges and builds-up steadily over time. Remove top cover. Wet a cotton swab with isopropyl alcohol (available at drug stores) and clean the inside. use a cotton bud where the swab gets entangled.
Possible printhead issue. Please reseat the black cartridge. Let the printer charge like it normally does. Print a nozzle check pattern. If you see gaps, missing lines or missing colors on the pattern, clean the printhead using the driver. 3 consecutive cleaning cycle is recommended. Compare the nozzle pattern over the last printout. If you see any improvement, you can clean the head numerous times until you get a perfect nozzle check pattern.
The chip that is located on the cartridge has to be reset also. You can take it to a ink cartridge replacement store. They will reset the chip when they refill the ink, however, Epson doesn't recommend this of course. It is cheaper this way.