If the issue still persists, the issue is with the printhead (if the cartridge is new) and you may have to replace the printhead in order to get the issue resolved. However, replacing the printhead is costly and not worthy, if the printer is old.
If you are not using a new cartridge, please try replacing the cartridge. if the issue persists with new cartridge, you required to change the printhead,.
Unfortunately, except for business-grade workgroup printers, few modern printers are repairable, and fewer are worth repairing. Most printers are now manufactured to a "replace not repair" standard. To understand why this is the case, consider the cold, hard, real-world cost of repairing a printer.
I would suggest you get a new printer instead of getting it repaired.
I understand that this answer may not be entirely to your liking, and I regret being the bearer of information that you really don’t want to hear. But it would be unfair to you and unprofessional of me were I to provide you with anything less than truthful and honest information.
Please know that not all issues can be fixed online; in those cases of a hardware failure, I’ll troubleshoot and diagnose the problem, and provide a practical recommendation for how to proceed.
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