10-30-2019 12:19 PM
@STruitt106, Welcome to HP Support Community!
If you have already performed the steps from the document HP OfficeJet 6900 Printers - Black or Color Ink Not Printing, Other Print Quality Issues and the issue persists, it could be a hardware failure.
Please reach out to the HP Support in your region regarding the service options for your printer.
Hope this helps!
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11-11-2019 07:00 PM
Soft reset didn't work. Replacing with brand new HP Genuine ink didn't work, Hard reset didn't work. Clean print heads didn't work. Clean smear didn't work. All other colors printing ok, but black not working.
11-12-2019 08:21 AM
Tried all steps...nothing works...your Support Team sent me a new black ink cartridge which I install and it didn't work. Now what...my thought is throwing it away and getting a Canon printer...perhaps it'll work better than HP...HELP!
11-12-2019 01:05 PM
If the advice from the HP technicians doesn't work, try https://www.youtube.com/watch?v=Ycc1zFQs3EA
This appears to be known problem with these printers. When printing with a cartridge that is near empty, the printer simply stops printing and won't print that color again even if you replace with a new ink cartridge.
I tried everything that these technicians recommended to no avail. Even replaced with a new ink cartridge after my printer stopped printing black ink. I watched the video above and then bought at $15 print head cleaner kit from Amazon. After using the cleaning kit and running 2 x print head cleaning cycles on the printer, the black ink started to work again.
This appears to be a design flaw with these printers that they won't acknowledge.
02-29-2020 05:05 PM
I did everything on the forum to try to get the black ink to work - hard reset, removing cords/power/cartridges and resetting, cleaning print head, etc. All other sites/forums had same solutions posted except Techwala (https://www.techwalla.com/articles/troubleshooting-hp-printer-that-is-not-printing-black-ink) mentioned doing a calibrating the print head "every time there is a need for a new printer cartridge, calibration is one of the steps to perform right after loading". I decided to give it a try (on the printer menu under Setup - Printer Maintenance - Align Printhead) and bingo! I see a lot of black printing, although the squares and rectangles still had some faded areas. A few more printouts and the black ink seems to be working fine. I am very relieved since the Officejet Pro 6978 has excellent features even for a few years old that the newer printers don't offer at the same price range (USB port, double sided scanning, 1GB memory) and really wanted to keep this one going.