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HP Smart Tank 615 Wireless All-in-One

good day ! our printer smart tank 615 series has some print quality issues that we cant seem to fix by cleaning the printheads. before this happened, our printer cant proceed to print any files as the printhead (iirc colored) is not installed properly, so we go to our nearest hp support store and have them fix it. at first, there was no more occuring problems, but weeks later i noticed that there seemed to be a banded rows of smudge/noise of the print output, then months later whenever we photocopy (b&w, plain paper), there's a severe white lines in the print output. this also happens now when we print pictures on plain papers. is there a way to fix this issue ? attach below is an image of our print output.  thank you so much (please excuse my grammatical errors, english is not my first language)

 

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