Nikon D3100 - Manual (Page 194)

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Attaching a Power Connector and AC Adapter
Turn the camera off before attaching an optional power connector and AC adapter.
1
Ready the camera.
Open the battery-chamber (q) and power connector (w)
covers.
2
Insert the EP-5A power connector.
Be sure to insert the connector in the correct orientation.
3
Close the battery-chamber cover.
Position the power connector cable so that it passes
through the power connector slot and close the battery-
chamber cover.
4
Connect the AC adapter.
Connect the AC adapter power cable to the AC socket on AC adapter (e) and
the EP-5A power cable to the DC socket (r). A
P icon is displayed in the
monitor when the camera is powered by the AC adapter and power connector.
r
e