9.   Plug in and then power on the printer.
10.   Make sure you update your printer driver to indicate the new option is installed. Installing Two 550-Sheet Trays Attention: To avoid paper jams, make sure no jobs are printing when you
start this procedure. If necessary, press the Online key to take the printer
offline. 1.   Power off and unplug the printer.
2.   Place a 550-Sheet Tray on a sturdy, level surface. Important: Do not move the printer when the 550-Sheet Tray is installed. 3.   Stack one tray on top of the other. Make sure to align the stubs on the second 550-Sheet Tray with the holes on the bottom of the first 550-Sheet
Tray. 162    Infoprint 21: User’s Guide