Thanks for confirming. This means that either the printhead was damaged, or that the printer is out of alignment.
Open up the printer, and look for the "carriage" that goes back and forth (on metal rails) over the paper while printing. This is the printhead.
Unfortunately your model does not have a removable printhead, so it will have to be cleaned in place. Fold up a piece of paper towel in quarters the long way, saturate the middle with rubbing alcohol, slide it under the print head, and pick up on the ends while moving up and down to clean it (think of drying your back with a towel).
Then wipe down the encoder strip, which is a clear plastic strip running the width of the printer, that sits just slightly above and behind the carriage.
Then reset the machine:
unplug power at the wall outlet
wait 5 minutes
press and hold the power/on button for 60+ seconds
keep holding while plugging back in, and for another 60 seconds after, then release
Let me know the results, and I’ll advise further if needed.