Thanks for taking an interest in the HP Support Forums! After reading your post I see that you are getting fax quality issue on HP Officejet 8600 printer. I would like to help you out with this issue today.
Clean the scanner components.
Change the fax speed.
Change the Error Correction Mode setting.
Update the printer firmware.
Reset the printer.
Click here and follow the document to perform above mentioned troubleshooting steps.
Let me know how it goes.
Sandytechy20 I am an HP Employee
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