Automatically print on both sides with Windows
On the File menu in the software program, click Print.
Select the product, and then click the Properties or
Print tasks for Windows
Click the Finishing tab.
Select the Print on both sides check box. Click the OK button
to print the job.
If the product is a duplex model and only manual
duplex appears, either the duplex unit is not installed
correctly in the Device Settings tab of the Printer Properties
dialog box, or the media type is not supported by the duplex