Installing a duplex unit The duplex unit attaches under the printer, below the standard input tray and above any paper drawers.
Back cover
Refer to the Lexmark T620/T622 Publications CD for details about using the duplex unit.
Lexmark T Family
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1 Place the duplex unit on top of any installed paper drawers, or the table or printer cabinet where you plan to use the printer.
The tab, peg, and holes on top of any drawer help you seat the duplex unit so the edges are aligned properly. Make sure it is securely in place.
2 Attach the printer. See “Setting up the printer” on page 7.
Tab 
Square hole
Round peg
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