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04-20-2017 09:30 AM
Welcome to HP Forums, this is a great place to get support, find answers and tips.
Thank you for posting your query, I'll be more than glad to help you.
I understand that you are facing scan quality issues while scanning from your HP Officejet Pro 6830 e-All-in-One Printer.
This issue could occur if the scanner glass is not clean or the scan settings are not correct.
Let's go through a few steps to troubleshoot this issue.
And here's the step by step guide for you in the link: Fixing Scan Quality Issues
You may try to make a copy from the unit and check.
Also, let us know the operating system installed on the computer from the links below:
Let me know how this works.
You have a good day ahead.