Hi,
According to the following link what you are experiencing is a very common problem with your model printer.
Here is a 'solution' as HP apparently do not want to know. Scroll down to Jambro's post of 11-11-2015 11:08 am.
http://h30434.www3.hp.com/t5/Scanning-Faxing-and-Copying/my-hp6500-printer-wont-pull-the-paper-thru-to-print-then/m-p/5349345#M129153