Printer is randomly printing half of a characters on entire line

I have an HP OfficeJet Pro L7580. The printer will sometimes print an entire line where only the bottom half of the character is printed. This could happen on 3 lines of a full page document. If I print 2 different pages and compare where on the document this occurs, it does happen at different places, but the entire line is affected. This only happens in BLACK. The other colors (including yellow) print fine. I tried replacing the cartridge with a brand new HP 88 and it is still happening. I tried cleaning the print heads many times and it still is happening. When I use the alignment tool, I sometimes get a displayed message, "alignment failed," but sometime I do succeed with the alignment. Can you please help me. I don't use this printer much, but when I do, I need it to work.
thank you!

This sounds like a print quality problem. Print quality on this series is controlled by the "printheads" (cartridge like things located in the printer carriage) so replacing the black ink will not be sufficient. Even if your printer is out of warranty the printheads are warrantied seperately so please call HP first, you may be lucky and find you are in warranty. The main troubleshooting steps you could try are:
- With printer turned on open the main top lid (so you can see inside the printer)
- hold down the "OK" button until the printer carriage moves all the way to the left hand side
- unplug power from back of printer to avoid shock (do not use power button because we want carriage to stay still)
- open the blue cover and remove the black and yellow printhead "K/Y" (careful may be dripping ink)
- clean electrical contacts in carriage and on printhead with damp lint free cloth and then dry off really well (use bottled water if possible + DO NOT clean bottom of printheads where ink comes out just the round copper/gold looking circular electrical contacts)
- check date of printhead, this will be a pain to read but it is probably stamped in the outside black casing starting with the year first (if in warranty HP may replace for you at no charge if issues persist after troubleshooting with them)
- re-insert printhead, close blue cover to carriage (don't be afraid to push down as you wanna make sure things are in place here)
- plug power in and press OK if the printer scolds you for an inpropper shutdown
- otherwise you can run "Calibrate Line Feed" and "Clean Printheads" from front panel by going to "SETUP" then arrow over to "TOOLS"
Again, not gonna hurt to call HP even if printer is OOW since printheads have their own warranties individual from the printer.
Print Quality Doc. Reference: http://h10025.www1.hp.com/ewfrf/wc/document?docname=c01957673&tmp_task=solveCategory&lc=en&dlc=en&cc...

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