Nikon D3X User Manual page 290

Connecting the Printer
Connect the camera using the supplied UC-E4 USB cable.
1
Select [MTP/PTP].
If the [USB] option in the camera setup
menu has been changed from the
default setting of [MTP/PTP], display the
[USB] menu and select [MTP/PTP] (pg.
257).
2
Turn the camera off.
3
Connect the USB cable.
Turn the printer on and connect the USB cable as shown. Do
not use force or attempt to insert the connectors at an angle.
4
Turn the camera on.
A welcome screen will be displayed in the monitor, followed
by a PictBridge playback display.
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