Nikon D90 - Manual (Page 270)

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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. Refer to the page numbers in
the right-most column for more information.
Display
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, taking care to avoid burns,
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.
Problem Solution Page
Viewfinder is out of focus.
Adjust viewfinder focus or use optional eyepiece
correction lenses.
32
Viewfinder is dark. Insert a fully-charged battery. 34
Displays turn off without warning.
Choose longer delays for Custom Setting c2 (Auto
meter-off delay) or c4 (Monitor off delay). 179,
180
Unusual characters displayed in
control panel. See “A Note on Electronically-Controlled
Cameras,” below.
250
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.
—