Fix a Carriage Jam for the HP Officejet Pro L7780 All-in-One Printer

Explains how to fix a carriage jam (also called a carriage stall) on HP Officejet Pro L7780 All-in-One Printer. These instructions also work for the Officejet L7650, L7680, and L7750. I am an HP employee but I do not represent HP on this site.