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Johnnycarbon
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After replacing all ink and aligning, the printer is now not using the black ink.

macOS 10.14 Mojave

HP OfficeJet Pro 6978 All In One, new HP ink cartridges, worked well then suddenly the black ink stopped. Attempted to Allign but no black ink. Cleaned and Resetted but to no avail.

 

 

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After replacing all ink and aligning, the printer is now not using the black ink.

@Johnnycarbon, Welcome to the HP Support Community!

 

Let us try these steps to resolve this issue:

 

Reset the printer

  1. With the printer turned on, disconnect the power cord from the rear of the printer.
  2. Wait at least 60 seconds.
  3. Reconnect the power cord to the rear of the printer.
  4. Turn ON the printer, if it does not automatically turn on.
  5. Wait until the printer is idle and silent before you proceed.

Note: HP recommends connecting the printer directly to a wall outlet rather than a surge protector or a power strip.

 

Update the printer firmware

Click here to know different methods of updating printer firmware.

 

Check the estimated ink levels

On the printer control panel, touch the Ink Level Indicator icon . The control panel displays estimated ink levels. Replace any low or empty cartridges.

 

Clean the printhead

  1. From the printer control panel, open the Setup  menu.

  2. Open the Printer Maintenance menu.

  3. If necessary, open the Tools menu, and then touch Clean Printhead.

  4. If the print quality is unacceptable, touch Clean Again to continue the next level of cleaning. If necessary, repeat these steps for the third cleaning cycle.

  5. NOTE: If the printhead is badly clogged, it might require another cleaning cycle. If so, wait 30 minutes before you perform all three levels of cleaning again.

Also, perform step 9 mentioned in this document. Try printing or making a copy and check if the issue persists.

 

Let me know how this goes.

 

If you feel my post solved your issue, please click “Accept as Solution”, it will help others find the solution. Click the “Kudos/Thumbs Up" on the bottom right to say “Thanks” for helping!

KUMAR0307
I am an HP Employee

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