HP 9600 Series - Manual (Page 41)

4-8 ENWW
6 Press the input tray lock and retract the tray until it stops at the edge of the media.
7 Lower the output tray to its horizontal position.
8 Extend the output tray if necessary.
When 8.5-by-11 inch paper is loaded in the input tray, the tray extension will close to the edge
of the paper and leave a slight gap between the extension and the tray. The tray extends
further to accommodate larger-sized media.