Dell 2355 Mono Laser User Manual page 304

Connect the cable into the connector on the back of the printer.
5
Load paper in the optional tray 2. For information about loading paper in this tray, see
6
"Loading Paper".
Reconnect the power cord and cables and then power the printer on.
7
After installing the optional tray 2, printer drivers will automatically sense tray 2.
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