@imy3180a
Thank you for joining the HP Community
I suggest you do a Hard Reset on the printer
(1) Turn the printer on, if it is not already on.
(2) Wait until the printer is idle and silent before you continue.
(3) With the printer turned on, disconnect the power cord from the rear of the printer.
(4) Unplug the power cord from the wall outlet.
(5) Wait at least 60 seconds.
(6) Plug the power cord back into the wall outlet.
NOTE: HP recommends connecting the printer power cord directly to the wall outlet.
(7) Reconnect the power cord to the rear of the printer.
(8) Turn on the printer, if it does not automatically turn on.
The printer might go through a warm-up period. The printer lights might flash, and the carriage might move.
Wait until the warm-up period finishes and your printer is idle and silent before you proceed.
Use an automated tool to clean the printhead
A printhead cleaning can fix many print quality issues. Follow these steps to clean the printhead.
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Load plain white paper into the input tray.
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Press the Setup button.
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Select Tools.
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Select Clean Printhead.
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Wait while the printer cleans the printhead.
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A test page prints after the printhead is cleaned.
Figure : Clean the printhead test page

Refer to this document: https://support.hp.com/in-en/product/hp-officejet-pro-l7700-all-in-one-printer-series/3601421/model/... for Fixing Print Quality Problems.
If the issue persists, replace the Ink Cartridge.
Keep me posted, how it goes!
If the information I've provided was helpful, give us some reinforcement by clicking the Accepted Solution and Kudos buttons, that'll help us and others see that we've got the answers!
Have a great day!
Cheers:)
Raj1788
I am an HP Employee