You can follow the instruction below to reset your printer Dell 1320 to Factory Default :

1. Power OFF the printer and DISCONNECT any data cables.
2. Open the side cover.
3. While pressing the Continue and Cancel buttons at the same time, turn on the printer.
4. CONTINUE to PRESS and HOLD the Continue and Cancel buttons until ALL the indicators are turned on, then release the two buttons.
5. After the Continue, Error, and Ready/Data indicators go out, close the side cover. your printer reset to factory default.