Nikon D90 User Manual page 270

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.
Displays turn off without warning.
Unusual characters displayed in
control panel.
Displays in control panel or
viewfinder are unresponsive and
dim.
Fine lines are visible around active
focus point or display turns red
when focus point is highlighted.
IThese phenomena are normal for this type of
viewfinder and do not indicate a malfunction.
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250
Solution
!Adjust viewfinder focus or use optional eyepiece
:correction lenses.
...............................
:Insert a fully-charged battery.
i
Choose longer delays for Custom Setting c2
(Auto
.meter-off delay)
or
c4 (Monitor off delay).
,
...
,.
'See "A Note on Electronically-Controlled
iCameras," below.
IThe response times and brightness of these
Idisplays varies with temperature.
Problem
Viewfinder is out of focus.
Viewfinder is dark.
D1
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.
250