HP Officejet J5740 All-in-One Printer - Manual (Page 154)

7. Flip the tray extender up toward you.
NOTE: When you use legal-size paper, leave the tray extender closed.
Cause: The print carriage has stalled.
Solution: Turn the HP All-in-One off, remove any objects that are blocking the print
carriage (including any packing materials), and then turn the HP All-in-One on again.
Cause: The computer is not communicating with the HP All-in-One.
Solution: If the HP All-in-One is not properly connected to the computer,
communication errors can occur. Make sure the USB cable is connected to the HP All-
in-One and the computer as shown below.
Chapter 12
152 Troubleshooting