Dell B3460DN Mono Laser User Manual page 18

Additional printer setup
1
Turn off the printer using the power switch, and then unplug the power cord from the electrical outlet.
2
Unpack the tray, and then remove all packing materials.
3
Pull the tray completely out of the base.
4
Remove any packing material from inside the tray.
5
Insert the tray into the base.
6
Place the tray near the printer.
7
Align the printer with the tray, and then lower the printer into place.
Note: Optional trays lock together when stacked.
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