I get incomplete printing for anything in black ink. and test bars are also faint

when printing documents the text in black comes out incomplete, some are fine, others are missing.  color images, printing are fine.  Test page comes out with extremely light for the black toner images as well as the black bars

Hi @denwa13,
Welcome to the HP Forums!
I understand that you are getting incomplete printing for anything in black ink, and test bars are also faint. I am happy to help you with this printing issue!
For further assistance, I will need some additional information:
The Product/Model Number of your printer. Follow instructions in this link. Finding Your HP Product Model Number.
If you are using a Windows or Mac Operating System, and the version number. To find the exact version, visit this link. Whatsmyos.
If the printer is connected, Wireless, Ethernet, or USB.
If the printer is able to make copies.
If the power cable is plugged into a surge protector, or directly to the wall outlet. Issues when Connected to an Uninterruptible Power Supply/Power Strip/Surge Protector. This applies to Inkjet printers as well. 
If you are using Windows, please try our HP Print and Scan Doctor, and post the results!
Please see this post, Want Good Answers? Ask Good Questions, by @Bob_Headrick, so you can get the most out of these forums.  
Hope to hear from you soon!
RnRMusicMan
I work on behalf of HP
Please click “Accept as Solution ” if you feel my post solved your issue, it will help others find the solution.
Click the “Kudos Thumbs Up" to say “Thanks” for helping!

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