Lexmark W820 User's Guide - Page 241

Tray Renumber Purpose: To configure your printer to work with printer drivers or applications that use different source assignments for the paper trays. First select a paper source: Assign Tray Assign MP Feeder Assign Env Feeder Assign Man Paper Assign Man Env Then select a value: Off* 0...199 None Printer uses factory default paper source assignments. Select a numeric value to assign a custom value to a paper source. Paper source ignores the Select Paper Feed command. Other Tray Renumber selections: View Factory Def Restore Defaults Press Menu to display the factory default value assigned to each paper source. Select Yes to return all tray assignments to factory default values. Note: Refer to the Technical Reference for more information about assigning source numbers. 239