Hello zenshemag,
Welcome to the HP Forums!
I understand your concerns with your Officejet 8600. If you are using the automatic document feeder, the tray capacity is up to 50 pages. This information is stated here. Click on "Paper handling specifications", then "Paper tray capacities".
The error message you are receiving is "check printer"? Does this message say where to check on your printer?
Please make sure this printer is plugged into a direct wall, not a surge protector. This step is crucial, since you receiving this message.
Also, try Resetting the Printer.
Please post your results, as I will be looking forward to hearing from you.
Have a great day!