4. Click Apply, and then click OK.5. Close the Devices and Printers dialog box.Windows Vista/Vista x64 1. Click start® Control Panel® Hardware and Sound® Printers.2. Right-click the printer that is using the PS driver, and then select Properties from the displayed list.3. Click the Device Settings tab, and then select 2-Tray Module for the Paper Tray Configuration item under Installable Options.4. Click Apply, and then click OK.5. Close the Printers dialog box.Windows Server 2008/Server 2008 x64 1. Click start® Control Panel® Printers.2. Right-click the printer that is using the PS driver, and then select Properties from the displayed list.3. Click the Device Settings tab, and then select 2-Tray Module for the Paper Tray Configuration item under Installable Options.4. Click Apply, and then click OK.5. Close the Printers dialog box.Windows XP/XP x64/Server 2003/Server 2003 x64 1. Click start® Printers and Faxes.2. Right-click the printer that is using PS driver, and then select Properties from the displayed list.3. Click the Device Settings tab, and then select 2-Tray Module for the Paper Tray Configuration item under Installable Options.4. Click Apply, and then click OK.5. Close the Printers and Faxes dialog box.Windows 2000/NT 4.0 1. Click start® Settings® Printers.2. Right-click the printer that is using PS driver, and then select Properties from the displayed list.3. Click the Device Settings tab, and then select 2-Tray Module for the Paper Tray Configuration item under Installable Options.4. Click OK.5. Close the Printers dialog box.Mac OS® X 10.5.x 1. Select the Print & Fax in System Preferences.2. Select the printer in Printers list, and click Options & Supplies.3. Select Driver, and select the options that have been installed on the printers, and then click OK.Mac OS X 10.2.x/10.3.x/10.4.x 1. Select the printer from the Printer List screen in Print Center (or Printer Setup Utility).2. Click Printers on the Print Center (or Printer Setup Utility) menu bar, and select Show Info.3. Select Installable Options, and select the options that have been installed on the printer, and then click Apply Changes.Installing a DuplexerNOTICE: To protect the drums of the print cartridges against bright light, close the front cover within five minutes. If the front cover remains open for more than five minutes, print quality may deteriorate.1. Ensure that the printer is turned off.2. Remove all packaging from duplexer.3. Push the side button and open the front cover.NOTICE: Ensure that nothing touches or scratches the surface (black-colored film) of the belt unit. Scratches, dirt, or oil from your hands on the film of the belt unit may reduce print quality.4. Pull up on the belt release levers and rotate the belt unit up as shown in the illustration.