I would recommend performing a nozzle cleaning. Please click HERE for the steps. Once the cleaning is done, please print the nozzle check and compare it to the nozzle check that opens by clicking the article I sent you.
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Have tried cleaning the timing strip as suggested, but I still have shadowing. It prints one line perfectly and then the next three to four lines have shadows, so much so it is almost impossible to read. Ready to throw away this uselsee printer. Very frustrated.
Anything else I can try? Am using refillable cartridges and have done so for a while. Only recenty had this problem. iMac OS Yosemite 10.10.5