Lexmark Optra E312L configuration page

You can print a config page from the Optra E312L that contains a lot of information about the printer, including paper tray setup, USB and parallel settings, PCL and PostScript settings, and print resolution.  The config page also shows the printers page count, serial number, and firmware version (under the Printer Information section).

To print the configuration page, simply press and release the button on the front right side of the printer (below the LEDs).  One of the green LEDs will begin flashing, and the config page will print out shortly.