Dell 2355dn User Manual page 327

Place the printer over the tray, aligning the feet on the printer with the alignment pins in the
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optional tray 2.
Connect the cable into the connector on the back of the printer.
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Load paper in the optional tray 2. For information about loading paper in this tray, see
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"Loading Paper".
Reconnect the power cord and cables and then power the printer on.
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After installing the optional tray 2, printer drivers will automatically sense tray 2.
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