HP Deskjet 6122 Color Inkjet Printer - Manual (Page 45)

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Upper Tray : Prints from the upper tray .
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Lower Tray : Prints from the lower tray .
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Automatic : Prints from the lower tray if the upper tray is empty.
two sided printing
Use the Two Sided Printing panel for these functions:
1. Print Both Sides : Check this box to print a two-sided document.
2. Binding : Select the appropriate binding:
Book binding
Tablet binding
5. Paper Source: Select between paper trays .