Samsung ML-2550 Series manual When you select any other value except, Auto Select from Tray Source

Item	Explanation
	Values: Off, On*
	When you select any other value except
	Auto Select from Tray Source and the
Tray Chaining	selected tray is empty, the printer
	automatically prints from other trays.
	If this menu item is set to Off, the
	On Line/Continue button backlight blinks
	in orange and the printer doesn’t work until
	you insert paper into the specified tray.

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USING THE CONTROL PANEL 3.9