Hello there mball625,
Welcome to the Forums!
I'm sorry to hear about the vertical lines you are seeing when you copy or scan with your Officejet 8600 Plus. Normally this issue is corrected with cleaning the scanner glass, ADF, separator pad and pick rollers so hopefully this can be resolved for you. Usually the cause is a piece of dust that is on the glass or rollers, etc.
The problem can also be power related. Be sure to plug the printer in directly to a wall socket to test that too.
Here is the guide for you to follow for this issue, the cleaning instructions are within here as well: Vertical Bands, Lines, or Streaks in Copies, Faxes, or Scans
Good luck!:)