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HP Recommended
HP PageWide MFP 377dw
macOS 10.14 Mojave

My office has two HP PageWide MFP 377dw printers. Both printers are leaving big fat spots of black ink on the entire page. I've cleaned the printers multiple times, but the spots keep coming back, which is wasting ink and making me have to print stuff out again.

 

All the spots are aligned vertically and they span the whole length of the page. If I print a bunch of things at once, the spots get less and less the more pages I print but they still show up at the bottom and on the back of the papers.

 

Please help me figure out what I need to do. Thank you in advance.

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