Dell B2375dfw Mono Multifunction Printer - Manual (Page 352)

7 Connect a necessary cable and power on the machine.
8 Load paper in the optional tray 2. For information about loading paper in this tray, see
"Loading Paper".
9 Reconnect the power cord and cables and then power the printer on.
After installing the optional tray 2, printer drivers will automatically sense tray 2.
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