Envy 4520 Horizontal gaps in solid black quality diagnostic with two new cartridges

[passaic]

Envy 4520 has been working fine.  Suddenly, occasional white streaks began showing up, usually on the left edge of bold  characters.  Printer diagnostic (run from printer control panel) show some streaks in the bold title line, then the Black  color block has a notch in the darkest column, about1/3 of the way from the top and about 1/2 the width of the column.

I replaced the black cartridge with new, twice.  Both show exactly the same errors.

I suspect a problem with the connections to the cartridge, something that "heals" itself within about a 1/16 inch of travel horizontally.

Can the cartridge carrier and associated cable be replaced?  Are parts available?

Jack

[Hawks_Eye]

Hi @passaic 

Welcome to the HP Support Community! 

Thanks for posting your query! We're here to help you get back up and running.

Please follow the steps below to resolve the print quality issue and let me know how it goes.

Turn the printer on.

Open the door to access the cartridges.

Wait until the carriage stops moving before you continue.

Remove the cartridge from its slot, holding it by its side.

CAUTION: Do not touch the copper-colored contacts or the ink nozzles. Touching these parts can result in clogs, ink failure, and bad electrical connections.
Lightly dampen a lint-free cloth with distilled water, and then clean only the copper-colored contacts on the cartridge and the electrical contacts located inside the printer.

Wait 10 minutes for the contacts to dry.

Reinsert the cartridge.

Close the cartridge access door.

If the error persists, repeat the previous steps to clean the cartridge and carriage contacts a second time.

Update the firmware on an HP printer

HP regularly releases new firmware versions for printer enhancements, app updates, or issue fixes. Update the firmware regularly to get the most out of your printer.

Click on the link below for instructions on how to update the firmware of your printer.

https://support.hp.com/in-en/document/ish_1776648-1643972-16

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Take care, and have an amazing day!

Regards, 

Hawks_Eye