Nikon D300s - Manual (Page 399)

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Troubleshooting
If the camera fails to function as expected, check the list of
common problems below before consulting your retailer or Nikon
representative.
❚❚Display
Viewfinder is out of focus : Adjust viewfinder focus or use optional diopter
adjustment lenses ( 0 36, 353).
Viewfinder is dark : Insert a fully-charged battery ( 0 22, 37).
Displays turn off without warning : Choose longer delays for Custom Setting c2
(
Auto meter-off delay) or c4 (Monitor off delay) (0 273, 274).
Unusual characters displayed in control panel : See “A Note on Electronically-
Controlled Cameras,” below.
Displays in control panel or viewfinder are unresponsive and dim
: The response times
and brightness of these displays varies with temperature.
Fine lines are visible around active focus point or display turns red when focus point is
highlighted
: These phenomena are normal for this type of viewfinder and do
not indicate a malfunction.
A A Note on Electronically-Controlled Cameras
In extremely rare instances, unusual characters may appear in the
control panel and the camera may stop functioning. In most cases, this
phenomenon is caused by a strong external static charge. Turn the
camera off, remove and replace the battery, and turn the camera on
again, or, if you are using an AC adapter (available separately),
disconnect and reconnect the adapter and turn the camera on again. In
the event of continued malfunction, contact your retailer or Nikon-
authorized service representative. Note that disconnecting the power
source as described above may result in loss of any data not recorded to
the memory card at the time the problem occurred. Data already
recorded to the card will not be affected.