HP ENVY 7855 error 0x6100004a

Turn off the printer and unplug the power cord to prevent motor burn-out. Open the access panel and inspect the extreme left and right sides with a flashlight. Gently push the carriage. It should slide freely. If it is locked, check for any small pieces of jammed paper or packing tape. Using a lint-free cloth lightly dampened with isopropyl alcohol, gently wipe the clear encoder strip running behind the carriage. Do not press hard or pull it. Plug in and power on. Verify if the carriage initializes with a smooth sweep.