HP Color LaserJet 8550 Multifunction Printer series - Manual (Page 60)

60 Chapter 3 Common copying tasks
EN
Loading media
Loading the system input trays
For complete instructions on loading and configuring input trays, see
the HP Color LaserJet 8500, 8550N, 8550DN, 8550GN, 8550MFP
Printer User Guide (on CD-ROM).
To load the system input trays, first adjust the media-width guides and
then load the media, as shown in the following procedures. After
loading the media, configure the input tray in the printer unit control
panel.
Note To avoid media jams, never add or remove media while the printer unit
is printing. Never overload an input tray.