This document provides the user guide for Lexmark printers X651de, X652de, X654de, X656de, X656dte, X658d, X658de, X658dme, X658dfe, X658dte, X658dtme, and X658dtfe. The document provides detailed information on printer security, configuration, scanner functions, printer control panel, installation of built-in options, cable connection, printer software setup, wireless printing setup, fax setup, and loading paper and special media.