Hello dee338.
I understand you are receiving problems copying a document with your Officejet 8600. Please follow this entire HP document on Vertical Bands, Lines, or Streaks in Copies.
This document will resolve your issue as long as you perform all the troubleshooting steps provided in the document. If this doesn't resolve your issue, then please contact HP technical support for further assistance since this is a hardware issue: HP Worldwide Contact.
I hope this works. If you have any further questions please let me know.