SOURCE: Dell 5310n Manual
Right at the Dell site.
Here you go
http://support.dell.com/support/edocs/systems/prn5210/
SOURCE: How to reset to factory default Dell 1720 network printer
1. Turn off the printer
2. Open the front cover.
3. While the Continue and Cancel buttons are depressed, turn the printer on.
4. When the error LED on the control panel is lit solid, close the cover.
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