Oki C 3400n - Manual (Page 28)

C3400n User’s Guide
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page 46 . The Duplex Help button also offers guidelines
on how to carry out manual duplex printing.
7. Driver Settings
If you have changed some printing preferences before
and saved them as a set under a specific name, you can
recall them under driver settings. Saving driver settings
means that you can avoid having to set printing
preferences individually each time you need them.
8. Default
Click the Default button to restore the default printer
settings.