HP Officejet J5740 All-in-One Printer - Manual (Page 203)

5. Slide the paper-width guide inward until it stops at the edge of the paper.
Do not overload the input tray; make sure the stack of paper fits within the input
tray and is no higher than the top of the paper-width guide.
6. Replace the output tray.
7. Flip the tray extender up toward you.
NOTE: When you use legal-size paper, leave the tray extender closed.
If you have Backup Fax Reception enabled, the HP All-in-One might have stored
the fax in memory upon reception. After you have correctly loaded the paper in the
input tray, the HP All-in-One automatically begins printing all the unprinted faxes from
memory, in the order they were received. If you do not have Backup Fax
Reception enabled, or if the fax was not stored in memory for some reason (for
example, if the HP All-in-One was out of memory), you will need to contact the sender
and ask for the fax to be resent.
Fax troubleshooting 201